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ASTM B842-99

(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
09-Nov-1999
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.06 - Soft Metals
Current Stage
Ref Project

Relations

Replaced By
ASTM B842-99(2005) - Standard Specification for Electrodeposited Coatings for Zinc Iron Alloy Deposits
Effective Date
15-Oct-2005

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ASTM B842-99 - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 842 – 99
Standard Specification for
Electrodeposited Coatings of Zinc Iron Alloy Deposits
This standard is issued under the fixed designation B 842; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope B 568 Test Method for Measurement of Coating Thickness
by X-Ray Spectrometry
1.1 This specification covers the requirements for electrode-
B 571 Test Method for Adhesion of Metallic Coatings
posited zinc iron alloy coatings on metals.
B 602 Test Method of Attribute Sampling of Metallic and
1.2 The values stated in either inch-pound or SI units are to
Inorganic Coatings
be regarded as standard. The units given in parentheses are for
B 697 Guide for Selection of Sampling Plans for Inspection
information only.
of Electrodeposited Metallic and Inorganic Coatings
1.3 The following precautionary caveat pertains to the test
B 762 Test Method of Variables 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,
B 849 Specification for Pretreatments of Iron or Steel for
if any, associated with its use. It is the responsibility of the user
Reducing Hydrogen Embrittlement
of this standard to establish appropriate safety and health
B 850 Specification for Post-Coating Treatments of Iron or
practices and determine the applicability of regulatory limita-
Steel for Reducing Risk of Hydrogen Embrittlement
tions prior to use.
D 3951 Practice for Commercial Packaging
2. Referenced Documents
3. Terminology
2.1 ASTM Standards:
3.1 Definitions—Many terms used in this specification are
B 117 Practice for Operating Salt Spray (Fog) Apparatus
defined in Terminology B 374.
B 183 Practice for Preparation of Low-Carbon Steel for
3.2 Definitions of Terms Specific to This Standard:
Electroplating
3.2.1 significant surface, n—that portion of a coated arti-
B 242 Practice for Preparation of High-Carbon Steel for
cle’s surface where the coating is required to meet all the
Electroplating
requirements of the coating specification for that article.
B 320 Practice for Preparation of Iron Castings for Electro-
3.2.1.1 Discussion—Significant surfaces are usually those
plating
2 that are essential to the serviceability or function of the article,
B 322 Practice for Cleaning Metals Prior to Electroplating
or that can be a source of corrosion products or tarnish films
B 374 Terminology Relating to Electroplating
that interfere with the function or desirable appearance of the
B 487 Test Method for Measurement of Metal and Oxide
article. Significant surfaces are those surfaces that are identi-
Coating Thickness by Microscopical Examination of a
2 fied by the purchaser by, for example, indicating them on an
Cross Section
engineering drawing of the product or marking a sample item
B 499 Test Method for Measurement of Coating Thick-
of the product.
nessesbytheMagneticMethod:NonmagneticCoatingson
Magnetic Basis Metals
4. Classification
B 504 Test Method for Measurement of Thickness of Me-
2 4.1 There is one class of zinc iron alloy that is defined as
tallic Coatings by the Coulometric Method
follows:
B 507 PracticeforDesignofArticlestoBeElectroplatedon
2 4.1.1 Class 1—Deposits having approximately 99 mass %
Racks
zinc, balance iron.
4.2 There are two coating types that are defined as follows:
This specification is under the jurisdiction of ASTM Committee B-8 on
4.2.1 Type A—Zinc iron with black chromate conversion
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
coating, and
B08.08.04 on Light Metals.
Current edition approved Nov. 10, 1999. Published March 2000. Originally
published as B 842 – 93. Last previous edition B 842 – 94.
2 3
Annual Book of ASTM Standards, Vol 02.05. Annual Book of ASTM Standards, Vol 15.09.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B842–99
4.2.2 Type B—Zinc iron with iridescent yellow chromate on a rack, contact marks may be unavoidable. Location of such
conversion coating. marks(s) shall be indicated on the article or its drawing.
4.3 There are three coating grades according to thickness
6.3.2 Defects and variations in appearance that arise from
that are defined as follows:
surfaceconditionsofthesubstrate(scratches,pores,rollmarks,
Minimum Thickness, µm New ASTM Grade Old ASTM Grade
inclusions, and the like) and that persist in the coating despite
the observance of good metal finishing practices shall not be
66 1
cause for rejection. The coating shall be adherent, free from
12 12 2
18 18 3
blisters, pits, or discontinuities, and shall be free of cracks in
the as-plated state. Flaking shall be cause for rejection in either
5. Ordering Information
the as-plated state or after subsequent operations.
5.1 In order to make the application of this specification
complete, the purchaser needs to supply the following infor- NOTE 2—These coatings are commonly used in automotive applica-
tions where subsequent forming, bending, and crimping operations are
mation to the seller in the purchase order and drawings:
commonly performed. These operations will necessarily detract from the
5.1.1 Title,ASTM designation number, and date of issue of
performance of the coatings. While some cracking of coatings will be
this specification,
unavoidable, flaking of the coating after these subsequent operations shall
5.1.2 Deposit by classification including class (see 4.1),
be cause for rejection.
type (see 4.2), and grade (see 4.3),
NOTE 3—Coatings generally perform better in service when the sub-
5.1.3 Composition and metallurgical condition of the sub-
strate over which they are applied is smooth and free of torn metal,
strate to be coated,
inclusions, pores, and other defects. The specifications covering the
5.1.4 Location of significant surfaces (see 3.2), unfinishedproductshouldprovidelimitsforthesedefects.Ametalfinisher
can often remove defects through special treatments, such as grinding,
5.1.5 Heat treatment for stress relief, whether it has been
polishing, abrasive blasting, chemical etches, and electropolishing. How-
performed by purchaser or is required (see 6.7),
ever, these are not normal in the treatment steps preceding the application
5.1.6 Heat treatment after electroplating, if required (see
of the coating. When they are desired, they are the subject of special
6.8),
agreement between the purchaser and the seller.
5.1.7 Any requirement for submission of sample coated
6.4 Thickness—The thickness of the coating everywhere on
articles,
the significant surfaces shall conform to the requirements as
5.1.8 Whether or not location of rack marks is to be defined
specified in 4.2 and defined in 3.2.1.
(see 6.3.1),
5.1.9 Any requirement for special test specimens (see 8.1),
NOTE 4—The coating requirement of this specification is a minimum.
5.1.10 Acceptance inspection procedure to be used (see
Variationinthethicknessfrompointtopointonanarticleandfromarticle
Section 8),
to article in a production lot is inherent in electroplating. Therefore, if all
5.1.11 Any requirement for certification (see Section 10), ofthearticlesinaproductionlotaretomeetthethicknessrequirement,the
average coating thickness for the production lot as a whole will be greater
and
than the specified minimum.
5.1.12 Anyotheritemsneedingagreement.Forthepurposes
of this specification, prior agreement on the nature of the finish
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-
ments set forth in Section 8.
6. Coating Requirements
6.6 Corrosion Resistance—The corrosion resistance of the
6.1 Substrate—The metal to be plated shall be free of flaws
coating may be evaluated using the method in Appendix X1.
and defects that will be detrimental to the zinc alloy coating. It
6.7 Pretreatment of Iron and Steel to Reduce the Risk of
shallbesubjectedtosuchcleaning,pickling,andelectroplating
Hydrogen Embrittlement:
procedures as are necessary to yield deposits with the desired
6.7.1 Parts that are made of steels with ultimate tensile
quality.
strengths of 1000 MPa (hardness of 31 HRC or greater) that
NOTE 1—Proper preparatory procedures and thorough cleaning are
havebeenmachined,ground,coldformed,orcoldstraightened
essential to ensure satisfactory adhesion and corrosion resistance perfor-
subsequent to heat treatment shall require stress relief heat
mance of the coating. Materials used for cleaning should not damage the
treatment when specified by the purchaser, the tensile strength
basismetal.Itisrecommendedthatthefollowingpracticesforcleaningbe
to be supplied by the purchaser. Specification B 849 may be
used, where appropriate: Practices B 183, B 242, B 320 and B 322.
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 Hydrogen Embrittlement:
6.2 Nature of Coating—The coating shall consist of a zinc
iron
...

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SCOPE
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SCOPE
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SCOPE
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SCOPE
1.1 This guide covers the use of the spot test for the measurement of thicknesses of electrodeposited chromium coatings over nickel and stainless steel with an accuracy of about ±20 % (Section 9). It is applicable to thicknesses up to 1.2 μm.2
Note 1: Although this test can be used for coating thicknesses up to 1.2 μm, there is evidence that the results obtained by this method are high at thicknesses greater than 0.5 μm.3 In addition, for coating thicknesses above 0.5 μm, it is advisable to use a double drop of acid to prevent depletion of the test solution before completion of the test.  
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ASTM B867-95(2023)(Specification)
Standard Specification for Electrodeposited Coatings of Palladium-Nickel for Engineering Use

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This specification establishes the requirements for electrodeposited palladium-nickel (Pd-Ni) coatings for engineering applications. Composite coatings consisting of palladium-nickel and a thin gold over-plate for applications involving electrical contacts are also covered. The classification system for the coatings covered here shall be specified by the basis metal, the thickness of the underplating, the composition type and thickness class of the palladium-nickel coating, and the grade of the gold overplating. Coatings should be sampled, tested, and conform to specified requirements as to purity, appearance, thickness, composition, adhesion, ductility, and integrity (including gross defects, mechanical damage, porosity, and microcracks). Alloy composition shall be examined either by wet method, X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Auger or electron probe X-ray microanalysis (EPMA), or wavelength dispersive spectroscopy (WDS). Coating adhesion shall be analyzed either by bend, heat, or cutting test.
SCOPE
1.1 Composition—This specification covers requirements for electrodeposited palladium-nickel coatings containing between 70 and 95 mass % of palladium metal. Composite coatings consisting of palladium-nickel and a thin gold overplate for applications involving electrical contacts are also covered.  
1.2 Properties—Palladium is the lightest and least noble of the platinum group metals. Palladium-nickel is a solid solution alloy of palladium and nickel. Electroplated palladium-nickel alloys have a density between 10 and 11.5, which is substantially less than electroplated gold (17.0 to 19.3) and comparable to electroplated pure palladium (10.5 to 11.8). This yields a greater volume or thickness of coating per unit mass and, consequently, some saving of metal weight. The hardness range of electrodeposited palladium-nickel compares favorably with electroplated noble metals and their alloys (1, 2).2  
Note 1: Electroplated deposits generally have a lower density than their wrought metal counterparts.
Approximate Hardness (HK25)  
Gold  
50–250  
Palladium  
75–600  
Platinum  
150–550  
Palladium-Nickel  
300–650  
Rhodium  
750–1100  
Ruthenium  
600–1300  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4  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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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
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