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ASTM B842-99(2005)

(Specification)

Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy Deposits

Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy Deposits

SCOPE
1.1 This specification covers the requirements for electrodeposited zinc iron alloy coatings on metals.  
1.2 The values stated in either inch-pound or SI units are to be regarded as the standard. The units given in parentheses are for information only.  
1.3 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
14-Oct-2005
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 B842-99 - Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy Deposits
Effective Date
15-Oct-2005
Replaced By
ASTM B842-99(2011) - Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy Deposits
Effective Date
01-Apr-2011

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ASTM B842-99(2005) - Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy DepositsASTM B842-99(2005) - Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy Deposits
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ASTM B842-99(2005) - Standard Specification for Electrodeposited Coatings for Zinc Iron 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B842 – 99 (Reapproved 2005)
Standard Specification for
1
Electrodeposited Coatings of Zinc Iron Alloy Deposits
This standard is issued under the fixed designation B842; 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 iron alloy coatings on metals.
Coatings
1.2 The values stated in SI units are to be regarded as
B602 Test Method for Attribute Sampling of Metallic and
standard. No other units of measurement are included in this
Inorganic Coatings
standard.
B697 Guide for Selection of Sampling Plans for Inspection
1.3 The following precautionary caveat pertains to the test
of Electrodeposited Metallic and Inorganic Coatings
method portion only, Section 8, of this specification: This
B762 Test Method of Variables Sampling of Metallic and
standard does not purport to address all of the safety concerns,
Inorganic Coatings
if any, associated with its use. It is the responsibility of the user
B849 Specification for Pre-Treatments of Iron or Steel for
of this standard to establish appropriate safety and health
Reducing Risk of Hydrogen Embrittlement
practices and determine the applicability of regulatory limita-
B850 Guide for Post-Coating Treatments of Steel for Re-
tions prior to use.
ducing the Risk of Hydrogen Embrittlement
2. Referenced Documents
D3951 Practice for Commercial Packaging
2
2.1 ASTM Standards:
3. Terminology
B117 Practice for Operating Salt Spray (Fog) Apparatus
3.1 Definitions—Many terms used in this specification are
B183 Practice for Preparation of Low-Carbon Steel for
defined in Terminology B374.
Electroplating
3.2 Definitions of Terms Specific to This Standard:
B242 Guide for Preparation of High-Carbon Steel for Elec-
3.2.1 significant surface, n—that portion of a coated arti-
troplating
cle’s surface where the coating is required to meet all the
B320 Practice for Preparation of Iron Castings for Electro-
requirements of the coating specification for that article.
plating
3.2.1.1 Discussion—Significant surfaces are usually those
B322 Guide for Cleaning Metals Prior to Electroplating
that are essential to the serviceability or function of the article,
B374 Terminology Relating to Electroplating
or that can be a source of corrosion products or tarnish films
B487 Test Method for Measurement of Metal and Oxide
that interfere with the function or desirable appearance of the
CoatingThicknessbyMicroscopicalExaminationofCross
article. Significant surfaces are those surfaces that are identi-
Section
fied by the purchaser by, for example, indicating them on an
B499 Test Method for Measurement of Coating Thick-
engineering drawing of the product or marking a sample item
nessesbytheMagneticMethod:NonmagneticCoatingson
of the product.
Magnetic Basis Metals
B504 Test Method for Measurement of Thickness of Me-
4. Classification
tallic Coatings by the Coulometric Method
4.1 There is one class of zinc iron alloy that is defined as
follows:
1
This specification is under the jurisdiction of ASTM Committee B08 on
4.1.1 Class 1—Deposits having approximately 99 mass %
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
zinc, balance iron.
B08.08.04 on Soft Metals.
4.2 There are two coating types that are defined as follows:
Current edition approved Oct. 15, 2005. Published October 2005. Originally
approved in 1993. Last previous edition approved in 1999 as B842 – 99. DOI: 4.2.1 Type A—Zinc iron with black chromate conversion
10.1520/B0842-99R05.
coating, and
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2.2 Type B—Zinc iron with iridescent yellow chromate
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
conversion coating.
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 ----------------------
B842 – 99 (2005)
4.3 There are three coating grades according to thickness on a rack, contact marks may be unavoidable. Location of such
that are defined as follows: marks(s) shall be indicated on the article or its drawing.
Minimum Thickness, µm New ASTM Grade Old ASTM Grade
6.3.2 Defects and variations in appearance that arise from
surfaceconditionsofthesubstrate(scratches,pores,rollmarks,
66 1
inclusions, and the like) and
...

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4.1 The thickness of a metal coating is often critical to its performance.  
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1.1 This guide covers the use of the dropping test to measure the thickness of electrodeposited zinc, cadmium, copper, and tin coatings.  
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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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1.2.6 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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Note 1: The following ASTM standards are not requirements. They are reference for information only: Practice B537, Specification B456, Test Method B602, and Specification B604.  
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