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ASTM B842-99(2011)

(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 SI units are to be regarded as standard. No other units of measurement are included in this standard.
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
31-Mar-2011
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(2005) - Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy Deposits
Effective Date
01-Apr-2011

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ASTM B842-99(2011) - Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy DepositsASTM B842-99(2011) - Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy Deposits
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ASTM B842-99(2011) - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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(Reapproved2011)
Standard Specification for
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope B568Test Method for Measurement of Coating Thickness
by X-Ray Spectrometry
1.1 Thisspecificationcoverstherequirementsforelectrode-
B571Practice 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
B602Test Method for Attribute Sampling of Metallic and
standard. No other units of measurement are included in this
Inorganic Coatings
standard.
B697Guide 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
B762Test 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
B849Specification 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-
B850GuideforPost-CoatingTreatmentsofSteelforReduc-
tions prior to use. ing the Risk of Hydrogen Embrittlement
D3951Practice for Commercial Packaging
2. Referenced Documents
3. Terminology
2.1 ASTM Standards:
B117Practice for Operating Salt Spray (Fog) Apparatus
3.1 Definitions—Many terms used in this specification are
B183Practice for Preparation of Low-Carbon Steel for
defined in Terminology B374.
Electroplating
3.2 Definitions of Terms Specific to This Standard:
B242Guide 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
B320Practice 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
B322Guide for Cleaning Metals Prior to Electroplating
that are essential to the serviceability or function of the article,
B374Terminology Relating to Electroplating
or that can be a source of corrosion products or tarnish films
B487Test Method for Measurement of Metal and Oxide
that interfere with the function or desirable appearance of the
Coating Thickness by Microscopical Examination of
article. Significant surfaces are those surfaces that are identi-
Cross Section
fied by the purchaser by, for example, indicating them on an
B499Test Method for Measurement of CoatingThicknesses
engineering drawing of the product or marking a sample item
by the Magnetic Method: Nonmagnetic Coatings on
of the product.
Magnetic Basis Metals
B504Test Method for Measurement of Thickness of Metal-
4. Classification
lic Coatings by the Coulometric Method
4.1 There is one class of zinc iron alloy that is defined as
follows:
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.
B08.06 on Soft Metals.
Current edition approved April 1, 2011. Published April 2011. Originally
4.2 There are two coating types that are defined as follows:
approved in 1993. Last previous edition approved in 2005 as B842–99 (2005).
DOI: 10.1520/B0842-99R11. 4.2.1 Type A—Zinc iron with black chromate conversion
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
coating, and
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.2.2 Type B—Zinc iron with iridescent yellow chromate
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. conversion coating.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B842−99(2011)
4.3 There are three coating grades according to thickness onarack,contactmarksmaybeunavoidable.Locationofsuch
that are defined as follows: mark(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 that persist in the coating despite
12 12 2
the observance of good metal finishing practices shall not be
18 18 3
cause for rejection. The coating shall be adherent, free from
5. Ordering Information
blisters, pits, or discontinuities, and shall be free of cracks in
5.1 In order to make the application of this specification theas-platedstate.Flakingshallbecauseforrejectionineither
complete, the purchaser needs to supply the following infor- the as-plated state or after subsequent operations.
mation to the seller in the purchase order and drawings:
NOTE2—Thesecoatingsarecommonlyusedinautomotiveapplications
5.1.1 Title,ASTM designation number, and date of issue of
where subsequent forming, bending, and crimping operations are com-
this specification,
monly performed. These operations will necessarily detract from the
5.1.2 Deposit by classification including class (see 4.1),
performance of the coatings. While some cracking of coatings will be
unavoidable,flakingofthecoatingafterthesesubsequentoperationsshall
type (see 4.2), and grade (see 4.3),
be cause for rejection.
5.1.3 Composition and metallurgical condition of the sub-
NOTE 3—Coatings generally perform better in service when the
strate to be coated,
substrate over which they are applied is smooth and free of torn metal,
5.1.4 Location of significant surfaces (see 3.2),
inclusions, pores, and other defects. The specifications covering the
5.1.5 Heat treatment for stress relief, whether it has been
unfinishedproductshouldprovidelimitsforthesedefects.Ametalfinisher
performed by purchaser or is required (see 6.7), can often remove defects through special treatments, such as grinding,
polishing, abrasive blasting, chemical etches, and electropolishing.
5.1.6 Heat treatment after electroplating, if required (see
However, these are not normal in the treatment steps preceding the
6.8),
application of the coating. When they are desired, they are the subject of
5.1.7 Any requirement for submission of sample coated
special agreement between the purchaser and the seller.
articles,
6.4 Thickness—The thickness of the coating everywhere on
5.1.8 Whetherornotlocationofrackmarksistobedefined
the significant surfaces shall conform to the requirements as
(see 6.3.1),
specified in 4.2 and defined in 3.2.1.
5.1.9 Any requirement for special test specimens (see 8.1),
5.1.10 Acceptance inspection procedure to be used (see
NOTE 4—The coating requirement of this specification is a minimum.
Section 8),
Variationinthethicknessfrompointtopointonanarticleandfromarticle
5.1.11 Any requirement for certification (see Section 10), to article in a production lot is inherent in electroplating. Therefore, if all
ofthearticlesinaproductionlotaretomeetthethicknessrequirement,the
and
averagecoatingthicknessfortheproductionlotasawholewillbegreater
5.1.12 Anyotheritemsneedingagreement.Forthepurposes
than the specified minimum.
ofthisspecification,prioragreementonthenatureofthefinish
6.5 Adhesion—Thecoatingshallwithstandnormalhandling
is required as items plated in bulk may differ slightly in
and storage conditions without chipping, flaking, or other
appearance from those that are rack plated.
coating damage and shall conform to the minimum require-
6. Coating Requirements
ments set forth in Section 8.
6.1 Substrate—The metal to be plated shall be free of flaws
6.6 Corrosion Resistance—The corrosion resistance of the
anddefectsthatwillbedetrimentaltothezincalloycoating.It
coating may be evaluated using the method in Appendix X1.
shallbesubjectedtosuchcleaning,pickling,andelectroplating
6.7 Pretreatment of Iron and Steel to Reduce the Risk of
procedures as are necessary to yield deposits with the desired
Hydrogen Embrittlement:
quality.
6.7.1 Parts that are made of steels with ultimate tensile
NOTE 1—Proper preparatory procedures and thorough cleaning are
strengths of 1000 MPa (hardness of 31 HRC or greater) that
essential to ensure satisfactory adhesion and corrosion resistance perfor-
havebeenmachined,ground,coldformed,orcoldstraightened
mance of the coating. Materials used for cleaning should not damage the
basismetal.Itisrecommendedthatthefollowingpracticesforcleaningbe subsequent to heat treatment shall require stress relief heat
used, where appropriate: Practices B183 and B320, and Guides B242 and
treatment when specified by the purchaser, the tensile strength
B322.
to be supplied by the purchaser. Specification B849 may be
6.1.1 Theelectroplatingshallbeappliedafterallbasismetal consulted for a list of pretreatments that are widely used.
heat treatments have been completed.
6.8 Coating Treatments of Iron and Steel to Reduce the Risk
6.2 Nature of Coating—The coating shall consist of a zinc
of Hydrogen Embrittlement:
ironalloythatisapproximately99mass
...

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Approximate Hardness (HK25)  
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4.1 The thickness of a metal coating is often critical to its performance.  
4.2 This procedure is useful for an approximate determination when the best possible accuracy is not required. For more reliable determinations, the following methods are available: Test Methods B487, B499, B504, and B568.  
4.3 This test assumes that the rate of dissolution of the coating by the corrosive reagent under the specified conditions is always the same.
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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.  
Note 1: Under most circumstances this method of measuring coating thicknesses is not as reliable or as convenient to use as an appropriate coating thickness gauge (see Test Methods B499, B504, and B568).  
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Standard Specification for Electrodeposited Copper for Engineering Uses

ABSTRACT
This specification establishes the requirements for electrodeposited copper coatings used for engineering purposes including surface hardening, heat treatment stop-off, as an underplate for other engineering coatings, for electromagnetic interference shielding in electronic circuitry, and in certain joining operations. This specification does not cover electrodeposited copper used as a decorative finish, as an undercoat for other decorative finishes, or for electroforming. Coatings shall be classified according to thickness. Metal parts shall undergo pre- and post-coating treatment for reducing the risk of hydrogen embrittlement, and peening. Coatings shall be sampled, tested, and shall conform to specified requirements as to appearance, thickness, porosity, solderability, adhesion, embrittlement relief, and packaging.
SCOPE
1.1 This specification covers requirements for electrodeposited coatings of copper used for engineering purposes. Examples include surface hardening, heat treatment stop-off, as an underplate for other engineering coatings, for electromagnetic interferences (EMI) shielding in electronic circuitry, and in certain joining operations.  
1.2 This specification is not intended for electrodeposited copper when used as a decorative finish, or as an undercoat for other decorative finishes.  
1.3 This specification is not intended for electrodeposited copper when used for electroforming.  
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.

  • Technical specification
    4 pages
    English language
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