ASTM B816 - 00(2009)

    Standard Specification for Coatings of Cadmium-Zinc Mechanically Deposited

    Active Standard ASTM B816 | Developed by Subcommittee: B08.06

    Book of Standards Volume: 02.05


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    Abstract

    This specification covers the requirements for cadmium-zinc coatings deposited on metallic products by mechanical deposition. The coating shall be classified in four thickness classes namely, Class 7, Class 12, Class 25, and Class 50. The coating shall also be classified according to coating types defined as Type I, Type IIa, Type IIb, Type IIc, and Type IId. The materials shall be subjected to the following test methods: coating composition determination; thickness measurement; adhesion test; corrosion resistance test; appearance test; and hydrogen embrittlement test.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    Significance and Use

    Corrosion Resistance, GeneralThis functional coating is used to provide corrosion resistance. The performance of this coating depends largely on its thickness and the kind of environment to which it is exposed. Published results of environmental corrosion studies have demonstrated that the coating provides corrosion resistance greater than equivalent thicknesses of zinc coatings in industrial environments and greater corrosion resistance than equivalent thicknesses of cadmium coatings in marine environments.

    Galvanic Corrosion ResistanceThe galvanic couple that results in the corrosion of steel and aluminum parts in contact with each other in corrosive environments can also be minimized by plating the steel parts with this mechanically deposited coating.

    Hydrogen Embrittlement, Absence ofThe mechanical coating process does not produce any permanent hydrogen embrittlement in products made from high-strength steels, for example, fasteners or lock washers.

    1. Scope

    1.1 GeneralThis specification covers the requirements for a coating that is a mixture of cadmium and zinc deposited on metallic products by mechanical deposition. The coating is provided in four thickness classes (see Table 1) and several finish types (see Table 2).

    1.2 ToxicityWarning: Cadmium is toxic; therefore these coatings should not be used on articles that will contact food or beverages, or for dental and other equipment that may be inserted into the mouth. Also, the coatings should not be used on articles that will be heated to high temperatures, because cadmium will form toxic fumes. Similarly, if coated articles are welded, soldered, or otherwise heated during fabrication, adequate ventilation should be provided to exhaust toxic fumes.

    1.3 Similar DocumentsOther kinds of mechanically deposited coatings are covered by Specifications B635, B695, and B696.

    1.4 The following precautionary caveat pertains only to the test method portion, Section 9, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    B117 Practice for Operating Salt Spray (Fog) Apparatus

    B183 Practice for Preparation of Low-Carbon Steel for Electroplating

    B242 Guide for Preparation of High-Carbon Steel for Electroplating

    B320 Practice for Preparation of Iron Castings for Electroplating

    B322 Guide for Cleaning Metals Prior to Electroplating

    B374 Terminology Relating to Electroplating

    B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section

    B499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals

    B571 Practice for Qualitative Adhesion Testing of Metallic Coatings

    B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings

    B635 Specification for Coatings of Cadmium-Tin Mechanically Deposited

    B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel

    B696 Specification for Coatings of Cadmium Mechanically Deposited

    B697 Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings

    B762 Test Method of Variables Sampling of Metallic and Inorganic Coatings

    E27 Method for Spectrographic Analysis of Zinc and Zinc Alloys by the Solution-Residue Technique Withdrawn.

    E396 Test Methods for Chemical Analysis of Cadmium

    E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys

    F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/B0816-00R09

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