ASTM B841-18
(Specification)Standard Specification for Electrodeposited Coatings of Zinc Nickel Alloy Deposits
Standard Specification for Electrodeposited Coatings of Zinc Nickel Alloy Deposits
ABSTRACT
This specification covers the requirements for electrodeposited zinc nickel alloy coatings on metals. The zinc nickel coating shall be defined as Class 1. The five chromate conversion coating types shall be defined as follows: Type A shall be with colorless conversion coatings, Type B shall be with yellow iridescent conversion coatings, Type C shall be with bronze conversion coatings, Type D shall be with black chromate conversion coatings, and Type E shall be with any colors mentioned plus organic topcoat. The metal to be plated shall be free of flaws and defects that will be detrimental to the zinc alloy coating. It shall be subjected to such cleaning, pickling, and electroplating procedures as necessary to yield deposits. The coating shall be produced from an aqueous electroplating system that may be either an alkaline or acid formulation. The coating on all ready visible surfaces shall have an acceptable and characteristic appearance. The coating shall be adherent, free from blisters, pits, or discontinuities, and shall be free of cracks in the as plated state. The coating shall withstand normal handling and storage conditions without chipping, flaking, or other coating damage. The corrosion resistance of the coating shall be evaluated.
SCOPE
1.1 This specification covers the requirements for electrodeposited zinc nickel alloy coatings on metals.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 The following precautionary statement pertains to the test method portion only, Section 8, 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 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.
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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.
Designation: B841 −18
Standard Specification for
1
Electrodeposited Coatings of Zinc Nickel Alloy Deposits
This standard is issued under the fixed designation B841; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope B499Test Method for Measurement of CoatingThicknesses
by the Magnetic Method: Nonmagnetic Coatings on
1.1 Thisspecificationcoverstherequirementsforelectrode-
Magnetic Basis Metals
posited zinc nickel alloy coatings on metals.
B504Test Method for Measurement of Thickness of Metal-
1.2 The values stated in SI units are to be regarded as the
lic Coatings by the Coulometric Method
standard.
B507Practice for Design ofArticles to Be Electroplated on
1.3 The following precautionary statement pertains to the
Racks
test method portion only, Section 8, of this specification: This B568Test Method for Measurement of Coating Thickness
standard does not purport to address all of the safety concerns,
by X-Ray Spectrometry
if any, associated with its use. It is the responsibility of the user B571Practice for Qualitative Adhesion Testing of Metallic
of this standard to establish appropriate safety, health, and
Coatings
environmental practices and determine the applicability of B602Test Method for Attribute Sampling of Metallic and
regulatory limitations prior to use.
Inorganic Coatings
1.4 This international standard was developed in accor- B697Guide for Selection of Sampling Plans for Inspection
dance with internationally recognized principles on standard-
of Electrodeposited Metallic and Inorganic Coatings
ization established in the Decision on Principles for the B762Test Method of Variables Sampling of Metallic and
Development of International Standards, Guides and Recom-
Inorganic Coatings
mendations issued by the World Trade Organization Technical B849Specification for Pre-Treatments of Iron or Steel for
Barriers to Trade (TBT) Committee.
Reducing Risk of Hydrogen Embrittlement
B850GuideforPost-CoatingTreatmentsofSteelforReduc-
2. Referenced Documents
ing the Risk of Hydrogen Embrittlement
2
D3951Practice for Commercial Packaging
2.1 ASTM Standards:
B117Practice for Operating Salt Spray (Fog) Apparatus
3. Terminology
B183Practice for Preparation of Low-Carbon Steel for
3.1 Definitions—Many items used in this specification are
Electroplating
defined in Terminology B374.
B242Guide for Preparation of High-Carbon Steel for Elec-
troplating 3.2 Definitions of Terms Specific to This Standard:
3.2.1 significant surface, n—that portion of a coated arti-
B320Practice for Preparation of Iron Castings for Electro-
plating cle’s surface where the coating is required to meet all the
B322Guide for Cleaning Metals Prior to Electroplating requirements of the coating specification for that article.
B374Terminology Relating to Electroplating Significant surfaces are usually those that are essential to the
B487Test Method for Measurement of Metal and Oxide serviceability or function of the article, or that can be a source
Coating Thickness by Microscopical Examination of of corrosion products or tarnish films that interfere with the
Cross Section function or desirable appearance of the article.
3.2.2 Discussion—Significant surfaces are those surfaces
that are identified by the purchaser by, for example, indicating
1
This specification is under the jurisdiction of ASTM Committee B08 on
them on an engineering drawing of the product or marking a
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
sample item of the product.
B08.06 on Soft Metals.
CurrenteditionapprovedJuly1,2018.PublishedJuly2018.Originallyapproved
4. Classification
in 1993. Last previous edition approved in 2018 as B841–99(2018). DOI:
10.1520/B0841-18.
4.1 There are two classes of zinc nickel coating defined as
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
follows:
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.1.1 Class 1—Deposits having a minimum of 5 and maxi-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. mum 12 mass % nickel, the balance being zinc.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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B841 − 18
4.1.2 Class 2—Deposits having a minimum of 12 and shallbesubjectedtosuchcleaning,pickling,andelectroplating
maximum 16 mass % nickel, the balanc
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B841 − 99 (Reapproved 2010) B841 − 18
Standard Specification for
1
Electrodeposited Coatings of Zinc Nickel Alloy Deposits
This standard is issued under the fixed designation B841; 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.
1. Scope
1.1 This specification covers the requirements for electrodeposited zinc nickel alloy coatings on metals.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 The following precautionary statement pertains to the test method portion only, Section 8, 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 safety, health, and healthenvironmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 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
2
2.1 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
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
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
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
D3951 Practice for Commercial Packaging
3. Terminology
3.1 Definitions—Many items used in this specification are defined in Terminology B374.
3.2 Definitions of Terms Specific to This Standard:
1
This specification is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.06 on Soft
Metals.
Current edition approved Jan. 1, 2010July 1, 2018. Published February 2010July 2018. Originally approved in 1993. Last previous edition approved in 120042018 as
B841 – 99(2004).(2018). DOI: 10.1520/B0841-99R09.10.1520/B0841-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
B841 − 18
3.2.1 significant surface, n—that portion of a coated article’s surface where the coating is required to meet all the requirements
of the coating specification for that article. Significant surfaces are usually those that are essential to the serviceability or function
of the article, or that can be a source of corrosion products or tarnish films that interfere with the function or desirable appearance
of the article.
3.2.2 Discussion—Significant surfaces are those surfaces that are identified by the purchaser by, for example, indicating them
on an engineering drawing of the product or marking a sample item of the product.
4. Classification
4.1 There is one classare two classes of zinc nickel coating de
...
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