ASTM B841-99(2004)
(Specification)Standard Specification for Electrodeposited Coatings for Zinc Nickel Alloy Deposits
Standard Specification for Electrodeposited Coatings for 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 and health practices and determine the applicability of regulatory limitations prior to use.
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B841 – 99 (Reapproved 2004)
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 B568 Test Method for Measurement of Coating Thickness
by X-Ray Spectrometry
1.1 This specification covers the requirements for electrode-
B571 Practice for Qualitative Adhesion Testing of Metallic
posited zinc nickel alloy coatings on metals.
Coatings
1.2 The values stated in SI units are to be regarded as the
B602 Test Method for Attribute Sampling of Metallic and
standard.
Inorganic Coatings
1.3 The following precautionary statement pertains to the
B697 Guide for Selection of Sampling Plans for Inspection
test method portion only, Section 8, of this specification: This
of Electrodeposited Metallic and Inorganic Coatings
standard does not purport to address all of the safety concerns,
B762 Test Method of Variables Sampling of Metallic and
if any, associated with its use. It is the responsibility of the user
Inorganic Coatings
of this standard to establish appropriate safety and health
B849 Specification for Pre-Treatments of Iron or Steel for
practices and determine the applicability of regulatory limita-
Reducing Risk of Hydrogen Embrittlement
tions prior to use.
B850 Guide for Post-Coating Treatments of Steel for Re-
2. Referenced Documents ducing the Risk of Hydrogen Embrittlement
2
B3951 Practice for Commercial Packaging
2.1 ASTM Standards:
B117 Practice for Operating Salt Spray (Fog) Apparatus
3. Terminology
B183 Practice for Preparation of Low-Carbon Steel for
3.1 Definitions—Many items used in this specification are
Electroplating
defined in Terminology B374.
B242 Guide for Preparation of High-Carbon Steel for Elec-
3.2 Definitions of Terms Specific to This Standard:
troplating
3.2.1 significant surface, n—that portion of a coated arti-
B320 Practice for Preparation of Iron Castings for Electro-
cle’s surface where the coating is required to meet all the
plating
requirements of the coating specification for that article.
B322 Guide for Cleaning Metals Prior to Electroplating
Significant surfaces are usually those that are essential to the
B374 Terminology Relating to Electroplating
serviceability or function of the article, or that can be a source
B487 Test Method for Measurement of Metal and Oxide
of corrosion products or tarnish films that interfere with the
CoatingThicknessbyMicroscopicalExaminationofCross
function or desirable appearance of the article.
Section
3.2.2 Discussion—Significant surfaces are those surfaces
B499 Test Method for Measurement of Coating Thick-
that are identified by the purchaser by, for example, indicating
nessesbytheMagneticMethod:NonmagneticCoatingson
them on an engineering drawing of the product or marking a
Magnetic Basis Metals
sample item of the product.
B504 Test Method for Measurement of Thickness of Me-
tallic Coatings by the Coulometric Method
4. Classification
B507 Practice for Design ofArticles to Be Electroplated on
4.1 There is one class of zinc nickel coating defined as
Racks
follows:
4.1.1 Class 1—Deposits having a minimum of 5 and maxi-
1
This specification is under the jurisdiction of ASTM Committee B08 on
mum 12 mass % nickel, the balance being zinc.
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
4.2 There are five chromate conversion coating types that
B08.08.04 on Soft Metals.
are defined as follows:
Current edition approved Aug. 1, 2004. Published August 2004. Originally
approved in 1993. Last previous edition approved in 1999 as B841 – 99. DOI:
4.2.1 Type A—With colorless (blue bright) conversion coat-
10.1520/B0841-99R04.
ings,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2.2 Type B—With yellow iridescent conversion coatings,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.2.3 Type C—With bronze conversion coatings,
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.
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B841 – 99 (2004)
4.2.4 Type D—With black chromate conversion coatings, 6.2 Nature of Coating:
and
6.2.1 Thecoatingshallconsistofazincnickelalloythathas
4.2.5 Type E—Any of the above plus organic topcoat.
a minimum of 5 and maximum 12 mass percent nickel, the
balance being zinc.
NOTE 1—Whereas colored chromate conversion coatings are usually
6.2.2 T
...
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