ASTM B766-86(1998)

    Standard Specification for Electrodeposited Coatings of Cadmium

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    1. Scope

    1.1 This specification covers the requirements for electrodeposited cadmium coatings on products of iron, steel, and other metals.

    Note 1-Cadmium is deposited as a coating principally on iron and steel products. It can also be electrodeposited on aluminum, brass, beryllium copper, copper, nickel, and powder metallurgy parts.

    1.2 The coating is provided in various thicknesses up to and including 25 [mu]m either as electrodeposited or with supplementary finishes.

    1.3 Cadmium coatings are used for corrosion resistance and for corrosion prevention of the basis metal part. The as-deposited coating (Type I) is useful for the lowest cost protection in a mild or noncorrosive environment where early formation of white corrosion products is not detrimental or harmful to the function of a component. The prime purpose of the supplementary chromate finishes (Types II and III) on the electroplated cadmium is to increase corrosion resistance. Chromating will retard or prevent the formation of white corrosion products on surfaces exposed to various environmental conditions as well as delay the appearance of corrosion from the basis metal.

    1.4 Cadmium plating is used to minimize bi-metallic corrosion between high-strength steel fasteners and aluminum in the aerospace industry. Undercutting of threads on fastener parts is not necessary as the cadmium coating has a low coefficient of friction that reduces the tightening torque required and allows repetitive dismantling.

    1.5 Cadmium-coated parts can easily be soldered without the use of corrosive fluxes. Cadmium-coated steel parts have a lower electrical contact resistance than zinc-coated steel. The lubricity of cadmium plating is used on springs for doors and latches and for weaving machinery operating in high humidity. Corrosion products formed on cadmium are tightly adherent. Unlike zinc, cadmium does not build up voluminous corrosion products on the surface. This allows for proper functioning during corrosive exposure of moving parts, threaded assemblies, valves, and delicate mechanisms without jamming with debris.


    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

    A165 Specification for Electrodeposited Coatings of Cadmium on Steel

    B117 Practice for Operating Salt Spray (Fog) Apparatus

    B183 Practice for Preparation of Low-Carbon Steel for Electroplating

    B201 Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces

    B242 Guide for Preparation of High-Carbon Steel for Electroplating

    B253 Guide for Preparation of Aluminum Alloys for Electroplating

    B254 Practice for Preparation of and Electroplating on Stainless Steel

    B281 Practice for Preparation of Copper and Copper-Base Alloys for Electroplating and Conversion Coatings

    B320 Practice for Preparation of Iron Castings for Electroplating

    B322 Guide for Cleaning Metals Prior to Electroplating

    B343 Practice for Preparation of Nickel for Electroplating with Nickel

    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

    B504 Test Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method

    B507 Practice for Design of Articles to Be Electroplated on Racks

    B558 Practice for Preparation of Nickel Alloys for Electroplating

    B567 Test Method for Measurement of Coating Thickness by the Beta Backscatter Method

    B568 Test Method for Measurement of Coating Thickness by X-Ray Spectrometry

    B571 Practice for Qualitative Adhesion Testing of Metallic Coatings

    B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings

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

    E8 Test Methods for Tension Testing of Metallic Materials

    F519 Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments

    Federal Standard

    QQ-P-416 Plating, Cadmium (Electrodeposited) Available from U.S. Government Printing Office, Washington DC 20402.

    Military Standard

    MIL-STD-1312 Fasteners, Test Methods Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.


    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/B0766-86R98

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