Designation:A780/A780M -09 (Reapproved 2015) INTERNATIONAL StandardPracticefor RepairofDamagedandUncoatedAreasofHot-Dip GalvanizedCoatings This standard is isued under the fised designation A780VA780M; the number immediately following the designaticn indicates the year of original adption or in th case of revisin the year f last revis. A nmber n prentheses indicates the year of last rapprl. A superscript epsiloe (e) indicates an editorial change since the last revisice or reapproval. This standondl hasr beem approved for ase bry agencier ef the U.S. Depermenr ef Defense. 1. Scope 2.Referenced Documents 1.1 This practice describes methods that may be used to 2.1 ASTM Srandards:2 q uspaadpopspea A902 Terminology Relating to Metallic Coated Steel Prod- structural shapes and other products fabricated prior to hot-dip D520 Specification for Zinc Dust Pigment ucts galvanizing and uncoated areas remaining after initial hot-dip galvanizing. The damage may be the result of welding or 2.2 Society for Protective Coatings (SSPC) Documents:3 cutting (flame) in which case the coating will be damaged SSPC-PA2 Measurement of Dry Paint Thickness with Mag- predominantly by burming. This practice can also be used to netic Gages repair hot-dip galvanized coatings damaged by excessively SSPC-SP2 Hand Tool Cleaning rough handling during shipping or erection. Requirements SSPC-SP5/NACE No.I White Metal Blast Cleaning concerning the renovation of uncoated areas remaining after SSPC-SP10/NACE No.2 Near-White Blast Cleaning initial hot-dip galvanizing are contained within the applicable SSPC-SP11 Power Tool Cleaning to Bare Metal material specification. 3. Terminology 1.2 This practice describes the use of low melting point zinc alloy repair rods or powders made specifically for this purpose 3.1 Definitions-For definitions of terms used in this the use of paints containing zinc dust and the use of sprayed practice refer to Terminology A902. zinc (metallizing). 4.Materials 1.3 The extent of repair shall be limited to an area mutually agreeable to the contracting parties. Similarly contracting 4.1 PropertiesThe material used for repairs shall have the parties shall agree to the repair method to be used. following characteristics: 4.1.1One application of the material shall provide a coating 1.4 This specification is applicable to orders in either thickness of at least 2.0 mils (50.8 μm). inch-pound units (as A780) or in SI units (as A780M). 4.1.2 The applied coating shall provide barrier protection Inch-pound units and SI units are not necessarily exact s o e oq d s pe equivalents. Within the text of this specification and where 4.1.3 Application of the coating material shall be possible appropriate SI units are shown in brackets. Each system shall under shop or field conditions. be used independently of the other without bining values in 4.2 TypesThere are three types of material that possess the any way. required properties and may be used to repair damaged 1.5 This stondard does not purpor to address the sofey galvanized coatings as follows: problems if any associated with its use. It is the responsibiliry 4.2.1 Zinc-Based SoldersZinc alloy solders are to be used of the user of this standord to establish appropriate sofery cnd for repairs. The most mon types of solders are zinc- health practrices and determine the applicabiliry of reguxlatory cadmium zinc-tin-lead and zinc-tin-copper alloys. Zinc- limitations prior to use. cadmium and zinc-tin-lead alloys have liquidus temperatures in the ranges from 518 to 527°F (270 to 275°C) and 446 to 500°F This peactice is under the jurisdiction of ASTM Committee A05 on Metallc- For referenced ASTM standards visit the ASTM website .astm.org or Coated Iron and Steel Products and is the direct responsibility of Submitee A05.13 on Structural Shapes and Hardware Specifications. Standrds volume information refer to the standard’s Document Summary page on contact ASTM Customer Service at service@astm.org. For Annal Book af ASTM Ourret edition aprned May 1. 2015. Published May 2015. Originaly approved in 1980. Last previous edition approred in 2009 as A780 09. DOI: 10.1520/A0780_A0780M-09R15. Ptsburgh PA 15222-466 htp//ww.spc.g Available frm Society foe Protective Ccotings SSPC) 40 24th St 6th Floot Cogytt ASTMlstemafonl No ngrducloe r otgpmd wad lrse m M Prodty PE Me lce ASTM Nt: far Resale 97/18.2018 13:20:58 MDT Uivesity of Meboum5912e5001 UerZARATE ANDREA A780/A780M-09(2015) (230 to 260°C) respectively. (The liquidus temperature is that resistance and service performance are very dependent on the temperature above which an alloy is pletely molten.) The properties of the paint system the extent of surface zinc-tin-copper alloys have a liquidus temperature in the range preparation and skills of individual applicators. Annex A2 from 660 to 670°F (349 to 354°C) but they are applied while D520 describes the zinc dust ponent of these paints. describes the use of paints containing zinc dust. Specification in a semisolid state in the preferred application temperature range from 480 to 570°F (250 to 300°C). The solders can be 4.2.3 Sprryed ZincThis method involves the application used in rod form or as powders. Annex A1 describes the use of of a zinc coating by spraying the surface to be repaired with zinc-based solders. process. Annex A3 describes the use of speayed zinc. droplets of molten metal using wire or ribbon or powder 4.2.2 Painzs Containing Zinc DusrThese are usually based on organic binders pre-mixed and formulated specifically for 4.3 For further information reference may be made to the use on steel surfaces. Paints containing zinc dust with concen- papers procedures and specifications in Refs. (1) through (2) trations of zinc dust in the range of 65 to 69 % or above 92 % (see list of references at the end of this practice). in the dried film are considered qually effective for the repair of damaged galvanized coatings. The repair paint to be used 5. Keywords shall be selected by the galvanizer unless the purchaser 5.1 coatings-zinc; galvanized coating repair; galvanized specifies a particular concentration or paint system. Corrosion coatings; touch-up: zinc coating repair; zinc coatings ANNEXES (Mandatory Information) A1. REPAIR USING ZINC-BASED ALLOYS A1.1 Clean the surface to be reconditioned using a wire A1.4 Rub the cleaned preheated area with the repair stick to brush a light grinding action or mild blasting. To ensure that deposit an evenly distributed layer of the zinc alloy. When a smooth reconditioned coating can be effected surface prepa- ration shall extend into the surrounding undamaged galva- powdered zinc alloys are used sprinkle the powder on the cleaned preheated surface and spread out with a spatula or nized coating. similar tool. The thickness of the applied coating shall be as A1.2 If the area to be reconditioned includes welds first agreed upon between the contracting parties. remove all weld flux residue and weld spatter (of a size that cannot be removed by wire brushing or blast cleaning) by A1.5 When the repair has been effected remove flux residue mechanical means such as chipping. grinding. or power by rinsing with water or wiping with a damp cloth. scaling etc. A1.6 Take thickness measurements with either a magnetic A1.3 Preheat the cleaned area to be reconditioned to at least electromagnetic or eddy-current gage to ensure that the 600°F (315°C). Do not overheat the surface beyond 750°F applied coating is as specified. (400°C) nor allow the surrounding galvanized coating to be bumed. Wire brush the surface to be reconditioned during preheating. Pre-flux if necessary. A2. REPAIR USING PAINTS CONTAINING ZINC DUST A2.1 Preparation of the damaged surface will be influenced A2.1.1 Surfaces to be reconditioned with paints containing by the type of paint selected and the anticipated service zinc dust shall be clean dry and free of oil grease preexisting conditions. Experience shows that in general organic zinc-rich paint and corrosion by-products. systems are tolerant of marginal surface preparation. Most organic paints containing zinc dust are not critical of climatic A2.1.2 Where anticipated field service conditions include or atmospheric conditions for curing. The following general immersion blast clean the surface in accordance with SSPC- guidelines shall apply: SP10/NACE No. 2 near white metal. For less critical field Coytt ASTMmafonl No nepauclce or nortitgpmied wlhad lerse m Mt ebyPEMhASTM No tr Resilte 9/82018 1329:58 MDT Univeriy of Melboume/S12895001 User=ZARATE ANDREA A780/A780M - 09 (2015) exposure conditions clean the surface to bare metal in A2.1.4 Spray or brush-apply the paints containing zinc dust accordance with SSPC-SP11 as a minimum. Where circum- stances do not allow blast or power tool cleaning it is to the prepared area. Apply the paint as in accordance with the permissible to hand tool areas clean in accordance with manufacturer's printed instructions in a single application SSPC-SP2. To cnsure that a smooth reconditioned coating can employing multiple passes to achieve a dry film thickness to be be effected surface preparation shall extend into the undam- agreed upon between the contracting parties. Allow adequate curing time before subjecting repaired items to service condi- aged galvanized coating. The method and extent of surface preparation shall be mutually agreeable to the contracting tions in accordance with the manufacturer’s printed instruc- parties. tions. A2.1.3 If the area to be reconditioned includes welds first A2.1.5 Take thickness measurements with either a remove all weld flux residue and weld spatter (of a size that magnetic electromagnetic or edy-current gage to ensure that cannot be removed by wire brushing or blast cleaning) by the applied coating is as specified in accordance with mechanical means such as chipping. grinding. or power SSPC-PA2. scaling etc. A3. REPAIR USING SPRAYED ZINC (METALLIZING) A3.1 Surfaces to be reconditioned by zinc metallizing shall A3.6 The surface of the sprayed coating shall be of uniform be clean dry and free of oil grease and corrosion products. texture free of lumps coarse areas and loosely adherent A3.2 If the area to be reconditioned includes welds first particles. remove all fux residue and weld spatter of a size or type that A3.7 The nominal thickness of the sprayed zinc coating cannot be removed by blast cleaning by mechanical means shall be previously agreed upon between the contracting that is chipping etc. parties. A3.3 Blast clean the surface to be reconditioned in accor- dance with SSPC-SP5/NACE No. 1 white metal. A3.8 Take thickness measurements with either a magnetic electromagnetic or eddy-current gage to ensure that the A3.4 To ensure that a smooth reconditioned coating can be applied coating is as specified. effected surface preparation shall be extended into the sur- Sueoo pozqueae3 poleepun Supunou A3.5 Apply the coating to the clean and dry surface by means of metal-spraying pistols fed with either zinc wire or zinc powder. Apply the sprayed coating as soon as possible after surface preparation and before visible deterioration of the surface has occurred. REFERENCES (1) Van Eijnsbergen J F. H. et al Reconditioning Damaged Galvanized e oa g .es (3) SSPC-Paint-20 Zinc Rich Coatings. Type I Inorganic Type II Organic Steel Structures Painting Council 4400 Fifth Ave. (2) *Remended Practices for Fused Thermal Sprayed Deposits Interlaken June 1961 pp. 128141. Pitsburgh PA 15213 1979. (4) MIL-P-21035 (Ships) Military Specification * Paint High Zinc Dust American Welding Society Inc 550 N.W. LeJeune Rd. Miami FL Content Galvanizing Repair Amendment 1 U.S. Govermment 33135 1975. Printing Office Washington DC 1970. Coyt ATMlol No nepauclce or neortitgpomied wlhad lerse m 3t ty PEMe whASTM Not tr Resilte 9/82018 13:2F:58 MDT ogUveity of Meboum9125001 UerZARATE ANDREA A780/A780M-09 (2015) in s standard Uers ofts standar are exssy aedhatdtmiaton ofte vay ofanysuch patnt rhs ane ASTM Intemationa/ takes no poition respecting the varldity of any paent rights asserted in connection with any item mentioned of infringement of such rights are entirely their own responsibity. rviffs This standard is subject fo revslon at any time by the responsible technical mttee ang must be reviewed every five years and and should be adtressed to ASTM Intemationa/ Headguarters. Your ments w receive carefuf consideration at a meeting of the responsible fehicaf mifee wich youmay at f you feef tht your mets hve no eceived a fairherng you shud make your views known to the ASTM Commitee on Standards at the aadress shown below: United States. Indivdual reprints (single or mufiple copies) of this standard may be obtained by contacting ASTM ar the above This standard is copyrighted by ASTM Intermationsl 100 Barr Harbor Drive PO Box C700 West Conshohocken PA 19428-2959 (amw.asdm.org) Pemission rights Io photocopy she standar may aso be secured from the Copyright Ciarance Centr 222 adtress or ar 610-832-9585 (phone) 610-832-9555 (fax) or service @astm.org (e-mai): or through the ASTM website Rosewood Drive Danvers MA 01923 Tel: (978) 646-2600; hfgp:/.copyright./ Prodnty PE Mai ner Icere wth ASTM Coytgt ASTMistaratona SH w44 uao Feg pigudDeou 0 grpude aN Not for Resile 47/182018 13.29:55 MDT ogUveity of Meoum9121 UerZARATE ANDREA
This intmatial stndard was deeloped in accordance with internationally recegnieed principls on standardizati stablshed in the Decisio en Principles for the Developm ent of Internaticnal Standards Guides and Remcndations issned by the Woeld Trade Organization Technical Barriers to Trade (TBT) Comittee. Designation:A780/A780M-20 INTERNATIONAL StandardPracticefor RepairofDamagedandUncoatedAreasofHot-Dip GalvanizedCoatings This standard is isued under the fised designation A780VA780M; the nember immediately following the designaticn indicates the year of original adoption or in the case of revision the year of last revisicn. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revisicen or reaproval. This standnd hs bem approed for ase br agecier ef fhe U.S. Deprment of Dfene. 1. Scope ization established in the Decision on Principles for the 1.1 This practice describes methods that may be used to Development of Internarional Standards Guides and Re- repair damaged hot-dip galvanized coatings on hardware mendations issued by rhe World Trade Organization Techunical structural shapes and ther products fabricated prior to hotdip Barriers to Trade (TBT) Commiltee. galvanizing and uncoated areas remaining after initial hot-dip galvanizing. The damage may be the result of welding or 2. Referenced Documents cutting (flame) in which case the coating will be damaged 2.1 ASTM Standarnds:2 predominantly by burming. This practice can also be used to A902 Terminology Relating to Metallic Coated Steel Prod- ucts rough handing during shipping or erection. Requirements D520 Specification for Zinc Dust Pigment concerning the renovation of uncoated areas remaining after 2.2 SSPC Documents:3 initial hot-dip galvanizing are contained within the applicable SSPC-PA2 Measurement of Dry Paint Thickness with Mag- material specification. netic Gages 1.2 This practice describes the use of low melting point zinc SSPC-SP5/NACE No.I White Metal Blast Cleaning SSPC-SP2 Hand Tool Cleaning the use of paints containing zinc dust and the use of sprayed alloy repair rods or powders made specifically for this purpose SSPC-SPI0/NACE No.2 Near-White Blast Cleaning zinc (metallizing). SSPC-SPl11 Power Tool Cleaning to Bare Metal 1.3 The extent of repair shall be limited to an area mutually 3. Terminology agreeable to the contracting parties. Similarly contracting parties shall agree to the repair method to be used. 3.1 Definitions-For definitions of terms used in this practice refer to Terminology A902. either inch-pound units (as A780) or in SI units (as A780M). 4. Materials Inch-pound units and SI units are not necessarily exact equivalents. Within the text of this specification and where 4.1 ProperriesThe material used for repairs shall have the appropriate SI units are shown in brackets. Each system shall following characteristics: 4.1.1 One application of the material shall provide a coating be used independently of the other without bining values in thickness of at least 2.0 mils [50.8 μm]. any way. 4.1.2 The applied coating shall provide barrier protection 1.5 This standard does not purport to address all of the and shall preferably be anodic to steel. safety concems if any. associated wizth its use. lt is the 4.1.3 Application of the coating material shall be possible responsibiliry of the user of this standard to establish appro- under shop or field conditions. priate safety health and environmental practices and deter- 4.2 7ypesThere are three types of material that possess the mine the applicabiliry of regulatory limitations prior to use. 1.6 This intermational stondord was developed in accor- required properties and may be used to repair damaged dance wirh intermationally recognized principles on stancdard- galvanized coatings as follows: This peactice is under the jurisdiction of ASTM Committee A05 on Metallic- For referenced ASTM standards visit the ASTM website .astm.org or Coated Iron and Steel Products and is the direct responsibility of Submite A05.13 on Structural Shapes and Hardware Specifications. Standrds volume information refer to the standard’s Document Summary page on contact ASTM Customer Service at service@astm.oeg. For Annol Book of ASTM Suuo oo aquadg papsnd 0coe 1 das podde up m approved in 1980. Last previous edition approved in 2015 as A780/ Ptsburgh PA 15222-4656 htp//ww.sspc.org. Available from Society foe Protective Costings (SSPC) 40 24th St 6th Floor A780M 09(2015). DOI: 10.1520/A0780_A0780M-20. Copyright 0 ASTM Intematfonal 100 Bar Hartor Orive PO Box C700 West Conshohocken PA 19428-2959. United Stalte 1 A780/A780M-20 4.2.1 Zinc-Based SoldersZinc alloy solders are to be used shall be selected by the galvanizer unless the purchaser for repairs. The most mon types of solders are zinc- specifies a particular concentration or paint system. Corosion cadmium zinc-tin-lead and zinc-tin-copper alloys. Zinc- resistance and service performance are very dependent on the cadmium and zinc-tin-lead alloys have liquidus temperatures in properties of the paint system the extent of surface the ranges from 518 to 527 °F [270 to 275 °C] and 446 to preparation and skills of individual applicators. Annex A2 500 °F [230 to 260 °C] respectively. (The liquidus temperature describes the use of paints containing zinc dust. Specification is that temperature above which an alloy is pletely molten.) D520 describes the zinc dust ponent of these paints. The zinc-tin-copper alloys have a liquidus temperature in the 4.2.3 Sprayed Zinc-This method involves the application range from 660 to 670 °F [349 to 354 °C] but they are applied of a zinc coating by spraying the surface to be repaired with while in a semisolid state in the preferred application tempera- droplets of molten metal using wire or ribbon or powder os 00 00 00 u am processes. Annex A3 describes the use of sprayed zinc. be used in rod form or as powders. Annex A1 describes the use spos paseq-ouz go 4.3 For further information reference may be made to the 4.2.2 Pcints Contcining Zinc DustThese are usually based papers procedures and specifications in Refs (1-4) (see list of on organic binders pre-mixed and formulated specifically for references at the end of this practice). use on steel surfaces. Paints containing zinc dust with concen- trations of zinc dust in the range of 65 to 69 % or above 92 % 5. Keywords in the dried film are considered equally effective for the repair 5.1 coatings-zinc; galvanized coating repair; galvanized of damaged galvanized coatings. The repair paint to be used coatings; touch-up; zinc coating repair; zinc coatings ANNEXES (Mandatory Information) A1. REPAIR USING ZINC-BASED ALLOYS A1.1 Clean the surface to be reconditioned using a wire A1.4 Rub the cleaned preheated area with the repair stick to brush a light grinding action or mild blasting. To ensure that a smooth reconditioned coating can be effected surface prea- deposit an evenly distributed layer of the zinc alloy. When ration shall extend into the surrounding undamaged galva- powdered zinc alloys are used sprinkle the powder on the nized coating. cleaned preheated surface and spread out with a spatula or similar tool. The thickness of the applied coating shall be as A1.2 If the area to be reconditioned includes welds first agreed upon between the contracting parties. remove all weld flux residue and weld spatter (of a size that cannot be removed by wire brushing or blast cleaning) by A1.5 When the repair has been effected remove flux residue mechanical means such as chipping grinding. or power by rinsing with water or wiping with a damp cloth. scaling etc. A1.6 Take thickness measurements with either a magnetic A1.3 Preheat the cleaned area to be reconditioned to at least electromagnetic or eddy-current gauge to ensure that the 600 °F [315 °C]. Do not overheat the surface beyond 750 °F applied coating is as specified. [400 °C] nor allow the surrounding galvanized coating to be bumed. Wire brush the surface to be reconditioned during preheating. Pre-fux if necessary.
esignation:A780-01StandardPracticefor RepairofDamagedandUncoatedAreasofHot-Dip GalvanizedCoatings1 jo e q sp u q u ppu qun a 0 ueup pg aq pss s pepus s original dptin or inthe ase of revisin te yea of last revisin A mber in pares idates the yr f lat rapl. superscript epsilon (e) indicates an editorial change since the last revision or reapproral. This standored har been opproved for ase bhy agencies ef the Deprrtment ef Defense. 1. Scope SSPC-PA2 Measurement of Dry Paint Thickness with Mag- 1.1 This practice describes methods which may be used to netic Gages repair damaged hot-dip galvanized coatings on hardware SSPC-SP2 Hand Tool Cleaninga structural shapes and other products fabricated prior to hot-dip SSPC-SP10/NACE No.2 Near-White Blast Cleaning4 SSPC-SP5/NACE No.1 White Metal Blast Cleaning* galvanizing and uncoated areas remaining after initial hot-dip galvanizing. The damage may be the result of welding or SSPC-SP11 Power Tool Cleaning to Bare Metal* cutting (flame) in which case the coating will be damaged predominantly by burming. This practice can also be used to 3. Terminology repair hot-dip galvanized coatings damaged by excessively 3.1 Definirions-For definitions of terms used in this rough handling during shipping or erection. Requirements practice refer to Terminology A 902. concerning the renovation of uncoated areas remaining after initial hot-dip galvanizing are contained within the applicable 4. Materials material specification. 4.1 ProperiesThe material used for repairs shall have the 1.2 This practice describes the use of low melting point zinc following characteristics: alloy repairods or powdersmade specifically for this pupose 4.1.1 One application of the material shall provide a coating the use of paints containing zinc dust and the use of sprayed thickness of at least 2.0 mils (50.8 μm). zinc (metallizing). 4.1.2 The applied coating shall provide barrier protection 1.3 The extent of repair shall be limited to an area mutually and shall preferably be anodic to steel. agreeable to the contracting parties. Similarly contracting 4.1.3 Application of the coating material shall be possible parties shall agree to the repair method to be used. under shop or field conditions. 1.4 This standard does not purport to address the sofery 4.2 TypesThere are three types of materal that possess problems if any associated with its use. Ir is the responsibiliry the required properties and may be used to repair damaged of the user of this standord to establish appropriate safery cnd galvanized coatings as follows: heaith practices and determine the applicabiliry ofregulatory 4.2.1 Zinc-Based SoldersZinc alloy solders are to be used limirations prior to use. for repairs. The most mon types of solders are zinc- 1.5 The values stated in inch-pound units are to be regarded cadmium zinc-tin-lead and zinc-tin-copper alloys. Zinc- as the standard. The values given in parentheses are for cadmium and zinc-tin-lead alloys have liquidus temperatures in information only. (230 to 260°C) respectively. (The liquidus temperature is that the ranges from 518 to 527°F (270 to 275°C) and 446 to 500°F 2. Referenced Documents temperature above which an alloy is pletely molten.) The 2.1 ASTM Standards: zinc-tin-copper alloys have a liquidus temperature in the range A 902 Teminology Relating to Metallic Coated Steel Prod- from 660 to 670°F (349 to 354°C) but they are applied while ucts2 in a semisolid state in the preferred application temperature D 520 Specification for Zinc Dust Pigment range from 480 to 570°F (250 to 300°C). The solders can be 2.2 Sociery for Protective Coatings (SSPC) Documents: used in rod form or as powders. Annex A1 describes the use of zinc-based solders. 4.2.2 Paints Containing Zinc DustThese are usually This prctioe is under the jurisditio of ASTM Commite A5 on Metallic based on organic binders pre-mixed and formulated specifi- Coated Iron and Stl Prodts an is the diret responsibility of Submmitee cally for use on steel surfaces. Paints containing zinc dust with A05.13 on Structeal Shapes and Hardare Specifications. concentrations of zinc dust in the range of 65 to 69 % or above published as A 780 80. Last previous edition A 780 00. qeuuo 1og oug ppnd 1oo o1 lady paadde oa un 2 Amal Boot ef ASTM Sndonds Vol 01.06. ^Aralable fm Steel Stuctures Painting Conil 4400 Ffth Ave. Ptsbrgh * Aomaal Booe of AST3M Stdrds Vol 06.03. PA 15213. Copyright @ ASTM 100 Barr Hartor Drive Wiest Conshohocken PA 19428-2959 United States. A780 92 % in the dried film are considered equally effective for the droplets of molten metal using wire or ribbon or powder used shall be selected by the galvanizer uless the purchaser repair of damaged galvanized coatings. The repair paint to be processes. Annex A3 describes the use of sprayed zinc. specifies a particular concentration or paint system. Corrosion 4.3 For further information reference may be made to the resistance and service performance are very dependent on the papers procedures and specifications in Refs. (1 through (4) properties of the paint system the extent of surface prepara- (see list of references at the end of this practice). tion and skills of individual applicators. Annex A2 describes the use of paints containing zinc dust. Specification D 520 5. Keywords describes the zinc dust ponent of these paints. 5.1 coatings-zinc; galvanized coating repair; galvanized 4.2.3 Sprayed Zinc-This method involves the application coatings; touch-up; zinc coating repair; zinc coatings of a zinc coating by spraying the surface to be repaired with ANNEXES (Mandatory Information) A1. REPAIR USING ZINC-BASED ALLOYS A1.1 Clean the surface to be reconditioned using a wire bumed. Wire brash the surface to be reconditioned during brush a light grinding action or mild blasting. To ensure that preheating. Pre-flux if necessary. a smooth recondiioned coating canb ffected surface ration shall extend into the surrounding undamaged galva- A1.4 Rub the cleaned preheated area with the repair stick nized coating. to deposit an evenly distributed layer of the zinc alloy. When powdered zinc alloys are used sprinkle the powder on the A1.2 If the area to be reconditioned includes welds first cleaned preheated surface and spread out with a spatula or remove all weld flux residue and weld spatter (of a size that similar tool. The thickness of the applied coating shall be as cannot be removed by wire brushing or blast cleaning) by agreed upon between the contracting parties. mechanical means such as chipping grinding or power A1.5 When the repair has been effected remove fux scaling etc. o duep e qm Sum no 1aem qm Susu Aq onpisn A1.3 Preheat the cleaned area to be reconditioned to at least A1.6 Take thickness mcasurements with either a magnetic 600°F (315°C). Do not overheat the surface beyond 750°F (400°C) nor allow the surrounding galvanized coating to be electromagnetic or eddy-current gage to ensure that the applied coating is as specified. A2. REPAIR USING PAINTS CONTAINING ZINC DUST A2.1 Preparation of the damaged surface will be influenced aged galvanized coating. The method and extent of surface by the type of paint selected and the anticipated service preparation shall be mutually agreeable to the contracting conditions. Experience shows that in general organic zinc-rich parties. systems are tolerant of marginal surface preparation. Most A2.1.3 If the area to be reconditioned includes welds first or atmospheric conditions for curing. The following general organic paints containing zinc dust are not critical of climatic remove all weld flux residue and weld spatter (of a size that cannot be removed by wire brushing or blast cleaning) by guidelines shall apply: mechanical means such as chipping grinding. or power A2.1.1 Surfaces to be reconditioned with paints containing scaling etc. zinc dust shalle clean dy and free f il grease pexistn A2.1.4 Spray or brush-apply the paints containing zinc dust paint and corrosion by-products. to the prepared area. Apply the paint as in accordance with the manufacturer’s printed instructions in a single application immersion blast clean the surface in accordance with SSPC- employing multiple passes to achieve a dry film thickness to be SP10/NACE No. 2 near white metal. For less critical field agreed upon between the contracting parties. Allow adequate exposure conditions clean the surface to bare metal in curing time before subjecting repaired items to service condi accordance with SSPC-SP11 as a minimum. Where circum- tions in accordance with the manufacturer’s printed instruc- stances do not allow blast or power tool cleaning it is tions. A2.1.5 Take thickness measurements with either a mag- SSPC-SP2. To ensure that a smooth reconditioned coating can netic electromagnetic or eddy-current gage to ensure that the be effected surface preparation shall extend into the undam- applied coating is as specified in accordance with SSPC-PA2. 2 A780 A3. REPAIR USING SPRAYED ZINC (METALLIZING) A3.1 Surfaces to be reconditioned by zinc metallizing shall zinc powder. Apply the sprayed coating as soon as possible be clean dry and free of oil grease and corrosion products. after surface preparation and before visible deterioration of the A3.2 If the area to be reconditioned includes welds first surface has occurred. remove all fux residue and weld spatter of a size or type that cannot be removed by blast cleaning by mechanical means A3.6The surface of the sprayed coating shall be of uniform that is chipping etc. texture free of lumps coarse areas and loosely adherent particles. A3.3 Blast clean the surface to be reconditioned in accor- dance with SSPC-SP5/NACE No. 1 white metal. A3.7T The nominal thickness of the sprayed zinc coating A3.4 To ensure that a smooth reconditioned coating can be shall be previously agreed upon between the contracting effected surface preparation shall be extended into the sur- parties. rounding undamaged galvanized coating. A3.8 Take thickness measurements with either a magnetic A3.5 Apply the coating to the clean and dry surface by electromagnetic or eddy-current gage to ensure that the means of metal-spraying pistols fed with either zinc wire or applied coating is as specified. REFERENCES (I) Van Eijnsbergen J. F. H et al Reconditioning Damaged Galvanized s (3) MIL-P-21035 (Ships) Military Specification " Paint High Zinc Dust Content Galvanizing Repair " Amendment 1 U.S. Government Interlaken June 1961 pp. 128141. Printing Office Washington DC 1970. (4) “Remended Practices for Fused Thermal Sprayed Deposits " Organic Steel Structures Painting Council 4400 Fifth Ave. Pitts- American Welding Society Inc. 550 N.W. LeJeune Rd. Miami FL burgh PA 15213 1979. 33135 1975. psufuAad ou pueugu Xqsuodsas umo sa (puue ave sufy qons jo yuufuur μo xsu au pue sufy uayed wh ay e mentedin s standard. Users of mis stndard are expessy aised fha dteminatio of the vafdy of ary suh f revsed taprvdwtrYurcmns areidetfrvisf sstndadrfrain/sanas This stanrd s sject foevisin a ay me by hereponsble echical mmttee anmusterevewed evey five year and ang shoufd be adresed to ASTM Headguarters. Your ments w receive carefu consideration af a meeting of phe esponsib techica mitee whh youmay altend. f you fee/ fha your ments have not receved a far hearing you should make you views know to the ASTM Commitee on Standerds af the address shown beiow. 610-832-9585 (phone) 610-832-9555 (lax) er service@Pastm.org (e-mai); or through me ASTM website (.astm.org). mdivcuaf reprints (single or mulfipie cpies) of mis standard may be obtaned by contacting ASTM ar the above address or at
本标准所代替标准的历次版本发布情况为: GB/T 11373-1989. II GB/T 11373-2017 热喷涂金属零部件表面的预处理 1范围 本标准规定了热喷涂金属零部件表面预处理的工艺过程,明确了热喷涂金属零部件表面预处理应 考虑的重要原则.
本标准适用于新件的生产,也适用于旧件的修复.
用于耐腐蚀的热喷涂锌、铝及其合金涂层参见GB/T9793.
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凡是不注日期的引用文件,其最新版本(包括的修改单)适用于本文件.
GB/T8923.1涂覆涂料前钢材表面处理表面清洁度的目视评定第1部分:未涂覆过的钢材 表面和全面清除原有涂层后的钢材表面的锈蚀等级和处理等级 GB/T9793热喷涂金属和其他无机覆盖层锌、铝及其合金 GB/T13288.1涂覆涂料前钢材表面处理喷射清理后的钢材表面粗糙度特性第1部分:用于 评定喷射清理后钢材表面粗糙度的ISO表面粗糙度比较样块的技术要求和定义 GB/T13288.2涂覆涂料前钢材表面处理喷射清理后的钢材表面粗糙度特性第2部分:磨料 喷射清理后钢材表面粗糙度等级的测定方法比较样块法 GB/T13288.3涂覆涂料前钢材表面处理喷射清理后的钢材表面粗糙度特性第3部分:ISO 表面粗糙度比较样块的校准和表面粗糙度的测定方法显微镜调焦法 GB/T13288.4涂覆涂料前钢材表面处理喷射清理后的钢材表面粗糙度特性第4部分:ISO 表面粗糙度比较样块的校准和表面租糙度的测定方法触针法 GB/T13288.5涂覆涂料前钢材表面处理喷射清理后的钢材表面粗糙度特性第5部分:表面 粗糙度的测定方法复制带法 GB/T18719热喷涂术语、分类 GB/T18838.1涂覆涂料前钢材表面处理喷射清理用金属磨料的技术要求导则和分类 砂(Preparation of steel substrates before application of paints and related productsSpecifications for metallic blast-cleaning abrasivesPart 2; Chilled-iron grit) 化铝 Preparation of steel substrates before application of paints and related products-Specifications for non-metallic blast-cleaning abrasives-Part 7; Fused Aluminium oxide) ISO12944-4涂料和油漆钢结构防腐蚀涂装系统第4部分:表面类型和表面准备(Paintsand varnishes-Corrosion protection of steel structures by protective paint systems-Part 4: Types of sur- face and surface preparation) GB/T 11373-2017 3术语和定义 GB/T18719界定的术语和定义适用于本文件.