ASTM B733-22 金属上的自催化（无电解）镍磷合金标准规范.pdf

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards Guides and Remendations issued by the World Trade Organization Technical Barriers to Trade (TBT)Committee. Designation:B733-22 INTERNATIONAL Standard Specification for Autocatalytic (Electroless)Nickel-Phosphorus Coatings on Metal1 This standard is issued under the fixed designation B733;the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon (e)indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the U.S.Department of Defense. 1.Scope* bondability increased electrical conductivity and resistance to 1.1 This specification covers requirements for autocatalytic strong alkali solutions. (electroless)nickel-phosphorus coatings applied from aqueous 1.8 The medium phosphorous coatings(5 to 9 P)are most solutions to metallic products for engineering (functional)uses. widely used to meet the general purpose requirements of wear 1.2 The coatings are alloys of nickel and phosphorus pro- and corrosion resistance. duced by autocatalytic chemical reduction with hypophosphite. 1.9 The high phosphorous (more than 10%P)coatings Because the deposited...