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ASTM B840-99(2004)

(Specification)

Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits

Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits

ABSTRACT
This specification covers the requirements for electrodeposited zinc cobalt alloy coatings on metals. The coating class is Class 1 and five coating types are Type a, Type b, Type c, Type d, and Type e. The metal to be plated shall be subjected to such cleaning, pickling, and electroplating procedures. Coating requirements include: substrate, nature of coating, appearance, thickness, adhesion, corrosion resistance, and pre- and post-coating treatments of iron and steel for reducing the risk of hydrogen embrittlement. Adhesion, porosity, corrosion resistance, or appearance tests shall be made.
SCOPE
1.1 This specification covers the requirements for electrodeposited zinc cobalt alloy coatings on metals.
1.2 The following precautionary caveat 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.

General Information

Status
Historical
Publication Date
31-Jul-2004
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 B840-99 - Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits
Effective Date
01-Aug-2004
Replaced By
ASTM B840-99(2009) - Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits
Effective Date
01-Sep-2009

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ASTM B840-99(2004) - Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy DepositsASTM B840-99(2004) - Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits
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ASTM B840-99(2004) - Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B840 – 99 (Reapproved 2004)
Standard Specification for
1
Electrodeposited Coatings of Zinc Cobalt Alloy Deposits
This standard is issued under the fixed designation B840; 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 cobalt alloy coatings on metals.
Coatings
1.2 The following precautionary caveat pertains to the test
B602 Test Method for Attribute Sampling of Metallic and
method portion only, Section 8, of this specification: This
Inorganic Coatings
standard does not purport to address all of the safety concerns,
B697 Guide for Selection of Sampling Plans for Inspection
if any, associated with its use. It is the responsibility of the user
of Electrodeposited Metallic and Inorganic Coatings
of this standard to establish appropriate safety and health
B762 Test Method of Variables Sampling of Metallic and
practices and determine the applicability of regulatory limita-
Inorganic Coatings
tions prior to use.
B849 Specification for Pre-Treatments of Iron or Steel for
2. Referenced Documents Reducing Risk of Hydrogen Embrittlement
2
B850 Guide for Post-Coating Treatments of Steel for Re-
2.1 ASTM Standards:
ducing the Risk of Hydrogen Embrittlement
B117 Practice for Operating Salt Spray (Fog) Apparatus
D3951 Practice for Commercial Packaging
B183 Practice for Preparation of Low-Carbon Steel for
Electroplating
3. Terminology
B242 Guide for Preparation of High-Carbon Steel for Elec-
3.1 Definitions—Many terms used in this specification are
troplating
defined in Terminology B374.
B320 Practice for Preparation of Iron Castings for Electro-
3.2 Definitions of Terms Specific to This Standard:
plating
3.2.1 significant surface, n—that portion of a coated arti-
B322 Guide for Cleaning Metals Prior to Electroplating
cle’s surface where the coating is required to meet all the
B374 Terminology Relating to Electroplating
requirements of the coating specification for that article.
B487 Test Method for Measurement of Metal and Oxide
Significant surfaces are usually those that are essential to the
CoatingThicknessbyMicroscopicalExaminationofCross
serviceability or function of the article or can be a source of
Section
corrosion products or tarnish films that interfere with the
B499 Test Method for Measurement of Coating Thick-
function or desirable appearance of the article. Significant
nessesbytheMagneticMethod:NonmagneticCoatingson
surfaces are those surfaces that are identified by the purchaser
Magnetic Basis Metals
by, for example, indicating them on an engineering drawing of
B504 Test Method for Measurement of Thickness of Me-
the product or marking a sample item of the product.
tallic Coatings by the Coulometric Method
B507 Practice for Design ofArticles to Be Electroplated on
4. Classification
Racks
4.1 There is one coating class, and it is defined as Class
1—deposits having 99 mass % zinc, the balance being cobalt.
1
This specification is under the jurisdiction of ASTM Committee B08 on 4.2 There are five coating types and they are defined as
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
follows:
B08.08.04 on Soft Metals.
4.2.1 Type a—With colorless (blue bright) chromate con-
Current edition approved Aug. 1, 2004. Published August 2004. Originally
version coatings.
approved in 1993. Last previous edition approved in 1999 as B840 – 99. DOI:
10.1520/B0840-99R04.
4.2.2 Type b—With yellow chromate conversion coating.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2.3 Type c—With bronze chromate conversion coating.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.2.4 Type d—With black chromate conversion coating.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.2.5 Type e—Any of the above types plus organic topcoat.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B840 – 99 (2004)
NOTE 1—Whereas colored chromate conversion coatings are usually
6.3 Appearance:
meant to include various shades of yellow to bronze when used with
6.3.1 The coating on all readily visible surfaces shall have
non-alloyed zinc, yellow and bronze chromate conversion coatings are
an acceptable and characteristic appearance as agreed upon by
considered distinctly differe
...

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Palladium  
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Platinum  
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Rhodium  
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