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.
ASTM B633-23 Referenced Document
ASTM A591/A591M Standard Specification for Steel Sheet, Electrolytic Zinc-Coated, for Light Coating Weight [Mass] Applications
ASTM B117 Standard Practice for Operating Salt Spray (Fog) Apparatus
ASTM B183 Standard Practice for Preparation of Low-Carbon Steel for Electroplating
ASTM B201 Standard Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces
ASTM B242 Standard Guide for Preparation of High-Carbon Steel for Electroplating
ASTM B254 Standard Practice for Preparation of and Electroplating on Stainless Steel
ASTM B320 Standard Practice for Preparation of Iron Castings for Electroplating
ASTM B322 Standard Guide for Cleaning Metals Prior to Electroplating
ASTM B374 Standard Terminology Relating to Electroplating
ASTM B487 Standard Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section
ASTM B499 Standard Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals
ASTM B504 Standard Test Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method*, 2023-05-01 Update
ASTM B567 Standard Test Method for Measurement of Coating Thickness by the Beta Backscatter Method*, 2024-04-20 Update
ASTM B568 Standard Test Method for Measurement of Coating Thickness by X-Ray Spectrometry
ASTM B571 Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
ASTM B602 Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
ASTM B697 Standard Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings
ASTM B748 Standard Test Method for Measurement of Thickness of Metallic Coatings by Measurement of Cross Section with a Scanning Electron Microscope
ASTM B762 Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
ASTM B849 Standard Specification for Pre-Treatments of Iron or Steel for Reducing Risk of Hydrogen Embrittlement
ASTM B850 Standard Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement
ASTM D2092 Standard Guide for Preparation of Zinc-Coated (Galvanized) Steel Surfaces for Painting
ASTM F1470 Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection*, 2024-01-26 Update
ASTM F1940 Standard Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners
ASTM F1941/F1941M Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric*, 2024-04-20 Update
ASTM F2078 Standard Terminology Relating to Hydrogen Embrittlement Testing
ISO/TR 20491 Fasteners — Fundamentals of hydrogen embrittlement in steel fasteners
ASTM B633-23 history
2023ASTM B633-23 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
2019ASTM B633-19 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
2015ASTM B633-15 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
2013ASTM B633-13 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
2011ASTM B633-11 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
2007ASTM B633-07 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
1998ASTM B633-98e1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
1998ASTM B633-98 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
1994ASTM B633-85(1994)e1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
1985ASTM B633-85e1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
1985ASTM B633-85 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel