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ASTM B633-07

(Specification)

Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel

Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel

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.
SCOPE
1.1 This specification covers requirements for electrodeposited zinc coatings applied to iron or steel articles to protect them from corrosion. It does not cover electrodeposited zinc-coated steel wire or sheets (see Specification A 591/A 591M for sheets).
1.2 The coatings are provided in four standard thickness classes (4.1), in the as-plated condition or with one of three types of supplementary finish (4.2).
1.3 High strength metals, unless otherwise specified, including high strength steels having a tensile strength greater than 1700 MPa (247 ksi Rc 46) shall not be electroplated.
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.
1.4 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 have been added to permit non-chromate passivate treatments to be used in replacement of hexavalent chromium.

General Information

Status
Historical
Publication Date
14-Jan-2007
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.06 - Soft Metals
Current Stage
Ref Project

Relations

Replaces
ASTM B633-98e1 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Effective Date
15-Jan-2007
Replaced By
ASTM B633-11 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Effective Date
01-Oct-2011
Referred By
ASTM D5363-16 - Standard Specification for Anaerobic Single-Component Adhesives (AN)
Effective Date
15-Jan-2007
Referred By
ASTM A194/A194M-23 - Standard Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
Effective Date
15-Jan-2007
Referred By
ASTM D6255/D6255M-18 - Standard Specification for Steel or Aluminum Slotted Angle Crates
Effective Date
15-Jan-2007
Referred By
ASTM F1387-23 - Standard Specification for Performance of Piping and Tubing Mechanically Attached Fittings
Effective Date
15-Jan-2007
Referred By
ASTM A193/A193M-23 - Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
Effective Date
15-Jan-2007
Referred By
ASTM F1548-01(2023) - Standard Specification for Performance of Fittings for Use with Gasketed Mechanical Couplings Used in Piping Applications
Effective Date
15-Jan-2007
Referred By
ASTM F1145-05(2022) - Standard Specification for Turnbuckles, Swaged, Welded, Forged
Effective Date
15-Jan-2007
Referred By
ASTM B745/B745M-15(2021) - Standard Specification for Corrugated Aluminum Pipe for Sewers and Drains
Effective Date
15-Jan-2007
Referred By
ASTM F1476-07(2019) - Standard Specification for Performance of Gasketed Mechanical Couplings for Use in Piping Applications
Effective Date
15-Jan-2007
Referred By
ASTM F1941/F1941M-16 - Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric
Effective Date
15-Jan-2007
Referred By
ASTM F782-19 - Standard Specification for Doors, Furniture, Marine
Effective Date
15-Jan-2007

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ASTM B633-07 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and SteelASTM B633-07 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
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ASTM B633-07 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B633 – 07
Standard Specification for
1
Electrodeposited Coatings of Zinc on Iron and Steel
This standard is issued under the fixed designation B633; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope B183 Practice for Preparation of Low-Carbon Steel for
Electroplating
1.1 This specification covers requirements for electrodepos-
B201 Practice for Testing Chromate Coatings on Zinc and
ited zinc coatings applied to iron or steel articles to protect
Cadmium Surfaces
them from corrosion. It does not cover electrodeposited zinc-
B242 Guide for Preparation of High-Carbon Steel for Elec-
coated steel wire or sheets (see SpecificationA591/A591M for
troplating
sheets).
B254 Practice for Preparation of and Electroplating on
1.2 The coatings are provided in four standard thickness
Stainless Steel
classes (4.1), in the as-plated condition or with one of three
B320 Practice for Preparation of Iron Castings for Electro-
types of supplementary finish (4.2).
plating
1.3 Highstrengthmetals,unlessotherwisespecified,includ-
B322 Guide for Cleaning Metals Prior to Electroplating
ing high strength steels having a tensile strength greater than
B374 Terminology Relating to Electroplating
1700 MPa (247 ksi R 46) shall not be electroplated.
c
B487 Test Method for Measurement of Metal and Oxide
1.4 This standard does not purport to address all of the
CoatingThicknessbyMicroscopicalExaminationofCross
safety concerns, if any, associated with its use. It is the
Section
responsibility of the user of this standard to establish appro-
B499 Test Method for Measurement of Coating Thick-
priate safety and health practices and determine the applica-
nessesbytheMagneticMethod:NonmagneticCoatingson
bility of regulatory limitations prior to use.
Magnetic Basis Metals
1.5 This standard has been revised to address RoHS re-
B504 Test Method for Measurement of Thickness of Me-
quirements that seek to limit the exposure of workers and the
tallic Coatings by the Coulometric Method
public from exposure to toxic metals. Additional types have
B567 Test Method for Measurement of Coating Thickness
been added to permit non-chromate passivate treatments to be
by the Beta Backscatter Method
used in replacement of hexavalent chromium.
B568 Test Method for Measurement of Coating Thickness
2. Referenced Documents
by X-Ray Spectrometry
2
B571 Practice for Qualitative Adhesion Testing of Metallic
2.1 ASTM Standards:
Coatings
A591/A591M Specification for Steel Sheet, Electrolytic
B602 Test Method for Attribute Sampling of Metallic and
Zinc-Coated, for Light Coating Weight [Mass] Applica-
3
Inorganic Coatings
tions
B697 Guide for Selection of Sampling Plans for Inspection
B117 Practice for Operating Salt Spray (Fog) Apparatus
of Electrodeposited Metallic and Inorganic Coatings
B762 Test Method of Variables Sampling of Metallic and
Inorganic Coatings
1
This specification is under the jurisdiction of ASTM Committee B08 on
B849 Specification for Pre-Treatments of Iron or Steel for
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
B08.08.04 on Soft Metals.
Reducing Risk of Hydrogen Embrittlement
Current edition approved Jan. 15, 2007. Published February 2007. Originally
B850 Guide for Post-Coating Treatments of Steel for Re-
´1
approved in 1978. Last previous edition approved in 1998 as B633 – 98 . DOI:
ducing the Risk of Hydrogen Embrittlement
10.1520/B0633-07.
2
D2092 Guide for Preparation of Zinc-Coated (Galvanized)
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Steel Surfaces for Painting
Standards volume information, refer to the standard’s Document Summary page on
F1470 Practice for Fastener Sampling for Specified Me-
the ASTM website.
3 chanical Properties and Performance Inspection
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B633 – 07
TABLE 1 Thickness Classes for Coatings TABLE 2 Finish Type and Corrosion Resistance Requirements
Classification Number Type Description Minimum Salt Spray
Thickness, min
and Conversion Service Condition h
µm
Coating Suffix
I As-plated without supplementary treatments
Fe/Zn 25 SC 4 (very severe) 25 II With colored chromate coatings 96
Fe/Zn 12 SC 3 (severe) 12 III With colorless c
...

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Approximate Hardness (HK25)  
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Palladium  
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Platinum  
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Rhodium  
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Ruthenium  
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This specification covers the requirements for electroplated nickel coatings applied to metal products for engineering applications (for example, for use as a buildup for mismachined or worn parts), for electronics applications (including as underplates in contacts or interconnections), and in certain joining applications. Coatings shall be available in any one of the following types: Type 1, coatings electroplated from solutions not containing hardeners, brighteners, or stress control additives; Type 2, electrodeposits used at moderate temperatures, and contain sulfur or other codeposited elements or compounds that are present to increase the hardness, refine grain structure, or control internal stress; and Type 3, electroplates containing dispersed submicron particles such as silicon carbide, tungsten carbide, and aluminum oxide that are present to increase hardness and wear resistance at specified temperatures. Metal parts shall undergo pre- and post-coating treatments to reduce the risk of hydrogen embrittlement, and peening. Coatings shall be sampled, tested, and conform accordingly to specified requirements as to appearance, thickness (measured either destructively by microscopical or coulometric method, or nondestructively by magnetic or X-ray method), adhesion (examined either by bend, file, heat and quench, or push test), porosity (assessed either by hot water, ferroxyl, or flowers of sulfur test), workmanship, and hydrogen embrittlement relief.
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1.1 This specification covers the requirements for electroplated nickel coatings applied to metal products for engineering applications, for example, for use as a buildup for mismachined or worn parts, for electronic applications, including as underplates in contacts or interconnections, and in certain joining applications.  
1.2 Electroplating of nickel for engineering applications (Note 1) requires technical considerations significantly different from decorative applications because the following functional properties are important:  
1.2.1 Hardness, strength, and ductility,  
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1.2.3 Load bearing characteristics,  
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1.2.5 Heat scaling resistance,  
1.2.6 Fretting resistance, and  
1.2.7 Fatigue resistance.  
Note 1: Functional electroplated nickel coatings usually contain about 99 % nickel, and are most frequently electrodeposited from a Watts nickel bath or a nickel sulfamate bath. Typical mechanical properties of nickel electroplated from these baths, and the combined effect of bath operation and solution composition variables on the mechanical properties of the electrodeposit are given in Guide B832. When electroplated nickel is required to have higher hardnesses, greater wear resistance, certain residual stress values and certain leveling characteristics, sulfur and other substances are incorporated in the nickel deposit through the use of certain addition agents in the electroplating solution. For the effect of such additives, see Section 4 and Annex A3. Cobalt salts are sometimes added to the plating solution to produce harder nickel alloy deposits.  
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1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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