INTERNATIONAL STANDARD
atmospheres-Salt spray tests Corrosiontestsin artificial
Essis de corrosion en atmospheres artificielles - Essois uxbrourillords solins
Contents
Page
Foreword.Introduction.... vi.Scope.2 3 Normative references.. Termsanddefinitions.. .2 14 Principle. .25 Test solutions.. 5.1 Preparation of the sodium chloride solution.. .25.2 Preparation of each test solution with pH adjustment. 2. 35.2.1 5.2.2 Acetic acid salt spray test.. pHofthesaltsolution.. Neutral salt spray tes.. .3 .35.2.4 5.2.3 Copper-accelerated acetic acid salt spray test.. 4. .35.3 Apparatus.. Filtration. .46.1 Component protection.. 4 46.2 6.3 Spray cabinet.. Heater and temperature control. .4. .46.4 6.5 Spraying devic.. Collectingdevices. .4 56.6 Re-use. .6Method for evaluating cabinet corrosivity 7.1 General 67.2 Reference specimens. 6 67.3 7.4 Determination of mass loss (mass per area) Arrangement of the reference specimens. .7 78 7.5 Test specimens. Satisfactory performance of cabinet. . .8 .86 Arrangement of the test specimens. .810 Operating conditions. 911 Treatment of test specimens after test Duration of tests. .912 12.1 General.. 10 1012.2 12.3 Organic coated test specimens. Non-organic coated test specimens: metallic and / or inorganic coated. 10 1012.3.2 Organic coated but not scribed test specimens. 12.3.1 Scribed organic coated test specimens. 10 1013 Evaluation ofresults. 1114 Test report. 11Annex A (informative) Example schematic diagram of one possible design of spray cabinet with means for optional treating fog exhaust and drain.. .13Susn Aisooo auqeo Supeneaa noj poau Arequaud (aageou) g xauuyAnnex C (normative) Preparation of specimens with organic coatings for testing. zinc reference specimens.. 15 .17Annex D (informative) Required supplementary information for testing test specimenswith organic coating.. 18
Annex E (informative) Examples of arrangement of the collecting devices 19Annex F (informative) Interlaboratory parison for reference specimens 21Bibliography- 23
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standardsthrough ISO technical mittees. Each member body interested in a subject for which a technical mittee has been established has the right to be represented on that mittee. Internationalorganizations governmental and non-governmental in liaison with ISO also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters ofelectrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described in the ISo/IEC Directives Part 1. In particular the different approval criteria needed for theeditorial rules of the ISo/IEC Directives Part 2 (see iso or* /directives). different types of ISo documents should be noted. This document was drafted in accordance with the
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in collaboration with the European Committee for Standardization (CEN) Technical Committee This document was prepared by Technical Committee ISO/TC 156 Corrosion of metals and alloys testing of metals and affoys in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This fifth edition cancels and replaces the fourth edition (ISO 9227:2017) which has been technically
The main changes are as follows:
- the arrangement of test specimens has been added;the arrangement of collecting devices has been changed; examples of arrangement of collectingdevices have been added as Annex E;grade steel and interlaboratory parison for reference specimens has been added as Annex E: the diluted acetic acid for preparing the test solution of AASS and CASS has been added;the allowed limit of copper concentration when the cabinet once used for CASS is re-used for NSS orAASS has been specified.
plete listing of these bodies can be found at iso ore/members.html.
Introduction
There is seldom a direct relation between resistance to the action of salt spray and resistance tocorrosion in other media because several factors influencing the progress of corrosion such as theshould not be regarded as a direct guide to the corrosion resistance of the tested metallic materials in all environments where these materials can be used. Also the performance of different materialsduring the test should not be taken as a direct guide to the corrosion resistance of these materials inservice.
Nevertheless the method described gives a means of checking that the parative quality of a metallicmaterial with or without corrosion protection is maintained.
Different metallic substrates (metals) cannot be tested in direct parison in accordance to their jo pu ues a o aqedde uo s usa aageedu sisa eds es u sauesisau uosoosubstrate.
Salt spray tests are generally suitable as corrosion protection tests for rapid analysis for discontinuities pores and damage in organic and inorganic coatings. In addition for quality control purposes parison can be made between specimens coated with the same coating. As parative tests however salt spray tests are only suitable if the coatings are sufficiently similar in nature.
When interpreting test results (e.g minimum time until appearance defects or protection defects) forproductqualitycontrol or acceptancespecificationsitisimportant torecognizethat the salt spraytestcan have a low level of reproducibility especially with production parts tested in different laboratories.
It is often not possible to use results gained from salt spray testing as a parative guide to thelong-term behaviour of different coating systems since the corrosion stress during these tests differssignificantly from the corrosion stresses encountered in practice.
