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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
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
2.1 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:
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
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.
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 that persist in the coating despite
12 12 2
18 18 3
the observance of good metal finishing practices shall not be
cause for rejection. The coating shall be adherent, free from
5. Ordering Information
blisters, pits, or discontinuities, and shall be free of cracks in
the as-plated state. Flaking shall be cause for rejection in either
5.1 In order to make the application of this specification
the as-plated state or after subsequent operations.
complete, the purchaser needs to supply the following infor-
mation to the seller in the purchase order and drawings:
NOTE 2—These coatings are commonly used in automotive applica-
5.1.1 Title,ASTM designation number, and date of issue of
tions where subsequent forming, bending, and crimping operations are
this specification,
commonly 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
type (see 4.2), and grade (see 4.3), unavoidable, flaking of the coating after these subsequent operations shall
be cause for rejection.
5.1.3 Composition and metallurgical condition of the sub-
strate to be coated, NOTE 3—Coatings generally perform better in service when the sub-
strate 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,
5.1.6 Heat treatment after electroplating, if required (see
polishing, abrasive blasting, chemical etches, and electropolishing. How-
6.8),
ever, these are not normal in the treatment steps preceding the application
5.1.7 Any requirement for submission of sample coated
of the coating. When they are desired, they are the subject of special
agreement between the purchaser and the seller.
articles,
5.1.8 Whether or not location of rack marks is to be defined
6.4 Thickness—The thickness of the coating everywhere on
(see 6.3.1),
the significant surfaces shall conform to the requirements as
5.1.9 Any requirement for special test specimens (see 8.1),
specified in 4.2 and defined in 3.2.1.
5.1.10 Acceptance inspection procedure to be used (see
Section 8), NOTE 4—The coating requirement of this specification is a minimum.
Variationinthethicknessfrompointtopointonanarticleandfromarticle
5.1.11 Any requirement for certification (see Section 10),
to article in a production lot is inherent in electroplating. Therefore, if all
and
ofthearticlesinaproductionlotaretomeetthethicknessrequirement,the
5.1.12 Anyotheritemsneedingagreement.Forthepurposes
average coating thickness for the production lot as a whole will be greater
of this specification, prior agreement on the nature of the finish
than the specified minimum.
is required as items plated in bulk may differ slightly in
6.5 Adhesion—Thecoatingshallwithstandnormalhandling
appearance from those that are rack plated.
and storage conditions without chipping, flaking, or other
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
and defects that will be detrimental to the zinc alloy coating. 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
subsequent to heat treatment shall require stress relief heat
basismetal.Itisrecommendedthatthefollowingpracticesforcleaningbe
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
consulted for a list of pretreatments that are widely used.
6.1.1 Theelectroplatingshallbeappliedafterallbasismetal
6.8 Coating Treatments of Iron and Steel to Reduce the Risk
heat treatments have been completed.
of Hydroge
...

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Approximate Hardness (HK25)  
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1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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ASTM B555-86(2023)(Guide)
Standard Guide for Measurement of Electrodeposited Metallic Coating Thicknesses by Dropping Test

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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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