ASTM B633 - 19

    Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel

    Active Standard ASTM B633 | Developed by Subcommittee: B08.06

    Book of Standards Volume: 02.05


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    Abstract

    This specification establishes the requirements for electrodeposited zinc coatings applied to iron or steel articles for corrosion protection purposes. Electrodeposited zinc-coated steel wires or sheets are not covered here. The coatings shall be provided in four standard thickness classes in the as-plated condition or with one of three types of supplementary finishes. The surfaces of the articles shall under go pre-plating basis metal cleaning, pre- and post-coating treatment for reducing the risk of hydrogen embrittlement, and reactivation and supplementary treatments. Coatings should be sampled, prepared, tested and conform accordingly to specified requirements as to appearance (luster and workmanship), thickness, adhesion, corrosion resistance, and hydrogen embrittlement.

    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.

    1. Scope

    1.1 This specification covers material and process requirements for electrodeposited zinc coatings applied to iron or steel articles to protect them from corrosion.

    1.2 This specification is not intended to provide the design activity with all the background needed to properly specify their zinc coating requirements. The users of Specification B633 are encouraged to review this specification in its entirety including the appendices, and access the supplementary papers, other standards, and published literature referenced herein and within other related references.

    1.3 The coatings are provided in four standard thickness classes (4.1), in the as-plated condition or with one of five types of supplementary finishes (4.2).

    1.4 High strength metals, including high strength steels having a tensile strength greater than 1700 MPa (247 ksi, 46 HRC) should not be zinc electroplated in accordance with this specification.

    1.5 It does not cover continuous processes for electrodeposited zinc coated steel wire or sheets (see Specification A591/A591M for sheets).

    1.6 For zinc electroplating of mechanical fasteners, the purchaser is encouraged to consider Specification F1941/F1941M.

    1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.8 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.9 This standard has been revised to address RoHS requirements that seek to limit the exposure of workers and the public from exposure to toxic metals. Additional types V and VI have been added to permit non-chromate passivate treatments to be used in replacement of hexavalent chromium.

    1.10 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 Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


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

    Military Standard

    MIL-STD-1312

    ASTM Standards

    A591/A591M Specification for Steel Sheet, Electrolytic Zinc-Coated, for Light Coating Weight [Mass] Applications

    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

    B254 Practice for Preparation of and Electroplating on Stainless Steel

    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

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

    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

    B748 Test Method for Measurement of Thickness of Metallic Coatings by Measurement of Cross Section with a Scanning Electron Microscope

    B762 Test Method of Variables Sampling of Metallic and Inorganic Coatings

    B849 Specification for Pre-Treatments of Iron or Steel for Reducing Risk of Hydrogen Embrittlement

    B850 Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement

    D2092 Guide for Preparation of Zinc-Coated (Galvanized) Steel Surfaces for Painting

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

    F1940 Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners

    F1941/F1941M Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric

    F2078 Terminology Relating to Hydrogen Embrittlement Testing

    ISO Standard

    ISO/TR 20491


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code 11101704(Steel)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/B0633-19

    Citation Format

    ASTM B633-19, Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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