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ASTM B700-08(2014)

(Specification)

Standard Specification for Electrodeposited Coatings of Silver for Engineering Use

Standard Specification for Electrodeposited Coatings of Silver for Engineering Use

ABSTRACT
This specification establishes the requirements for electrodeposited silver coatings that may be mat, bright, or semibright, and are usually employed as solderable surfaces and for their electrical contact characteristics, high electrical and thermal conductivity, thermocompression bonding, wear resistance on load-bearing surfaces, and spectral reflectivity. Coatings shall be classified into types according to minimum purity, grade according to surface appearance (bright, semibright, or mat), and class according to whether any surface treatment has been applied. Coatings shall undergo preplating operations such as stress relief treatment, strike, and underplating, as well as post-plating embrittlement relief. Coatings shall be sampled, tested, and conform accordingly to specified requirements as to nature, purity, appearance, defects, adhesion, solderability, hardness, spectral reflectance, electrical conductivity, hydrogen embrittlement relief, and thickness (measured either nondestructively by beta backscatter, X-ray spectrometry, or magnetic method, or destructively by coulometric technique or microscopical cross-sectioning procedure).
SCOPE
1.1 This specification covers requirements for electrodeposited coatings of silver used for engineering purposes that may be mat, bright, or semibright and are not less than 98 % silver purity.  
1.2 Coatings of silver covered by this specification are usually employed for solderable surfaces, electrical contact characteristics, high electrical and thermal conductivity, thermocompression bonding, wear resistance of load-bearing surfaces, and spectral reflectivity.  
1.3 In the Appendixes important characteristics of electrodeposited silver coatings are briefly described which must be considered when used in engineering applications, namely electrical conductivity (see Appendix X1), silver migration (see Appendix X2), thickness (see Appendix X3), hardness (see Appendix X4), and atmospheric tarnish (see Appendix X5).  
1.4 The following hazards caveat pertains only to the test methods section of this specification:  This standard does not purport to address 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
30-Apr-2014
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.04 - Precious Metal Coatings
Current Stage
Ref Project

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ASTM B700-08(2014) - Standard Specification for Electrodeposited Coatings of Silver for Engineering UseASTM B700-08(2014) - Standard Specification for Electrodeposited Coatings of Silver for Engineering Use
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ASTM B700-08(2014) - Standard Specification for Electrodeposited Coatings of Silver for Engineering Use
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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:B700 −08 (Reapproved 2014)
Standard Specification for
1
Electrodeposited Coatings of Silver for Engineering Use
This standard is issued under the fixed designation B700; 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 B254 Practice for Preparation of and Electroplating on
Stainless Steel
1.1 This specification covers requirements for electrodepos-
B281 Practice for Preparation of Copper and Copper-Base
ited coatings of silver used for engineering purposes that may
Alloys for Electroplating and Conversion Coatings
be mat, bright, or semibright and are not less than 98 % silver
B322 Guide for Cleaning Metals Prior to Electroplating
purity.
B343 Practice for Preparation of Nickel for Electroplating
1.2 Coatings of silver covered by this specification are
with Nickel
usually employed for solderable surfaces, electrical contact
B374 Terminology Relating to Electroplating
characteristics, high electrical and thermal conductivity, ther-
B481 Practice for Preparation of Titanium and Titanium
mocompression bonding, wear resistance of load-bearing
Alloys for Electroplating
surfaces, and spectral reflectivity.
B482 Practice for Preparation of Tungsten and Tungsten
1.3 In the Appendixes important characteristics of elec- Alloys for Electroplating
trodeposited silver coatings are briefly described which must
B487 Test Method for Measurement of Metal and Oxide
be considered when used in engineering applications, namely
Coating Thickness by Microscopical Examination of
electrical conductivity (see Appendix X1), silver migration
Cross Section
(see Appendix X2), thickness (see Appendix X3), hardness
B499 Test Method for Measurement of Coating Thicknesses
(see Appendix X4), and atmospheric tarnish (see Appendix
by the Magnetic Method: Nonmagnetic Coatings on
X5).
Magnetic Basis Metals
B504 Test Method for Measurement of Thickness of Metal-
1.4 The following hazards caveat pertains only to the test
lic Coatings by the Coulometric Method
methods section of this specification: This standard does not
B507 Practice for Design of Articles to Be Electroplated on
purport to address the safety concerns, if any, associated with
Racks
its use. It is the responsibility of the user of this standard to
B542 Terminology Relating to Electrical Contacts and Their
establish appropriate safety and health practices and deter-
Use
mine the applicability of regulatory limitations prior to use.
B567 Test Method for Measurement of Coating Thickness
2. Referenced Documents
by the Beta Backscatter Method
2
2.1 ASTM Standards: B568 Test Method for Measurement of Coating Thickness
B183 Practice for Preparation of Low-Carbon Steel for
by X-Ray Spectrometry
Electroplating B571 Practice for Qualitative Adhesion Testing of Metallic
B242 Guide for Preparation of High-Carbon Steel for Elec-
Coatings
troplating B578 Test Method for Microhardness of Electroplated Coat-
B252 Guide for Preparation of Zinc Alloy Die Castings for
ings
Electroplating and Conversion Coatings B579 Specification for Electrodeposited Coatings of Tin-
B253 Guide for Preparation of Aluminum Alloys for Elec-
Lead Alloy (Solder Plate)
troplating
B602 Test Method for Attribute Sampling of Metallic and
Inorganic Coatings
1
This specification is under the jurisdiction of ASTM Committee B08 on
B678 Test Method for Solderability of Metallic-Coated
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
Products
B08.04 on Precious Metal Coatings.
B697 Guide for Selection of Sampling Plans for Inspection
Current edition approved May 1, 2014. Published May 2014. Originally
of Electrodeposited Metallic and Inorganic Coatings
approved in 1981. Last previous edition approved in 2008 as B700 – 08. DOI:
10.1520/B0700-08R14.
B762 Test Method of Variables Sampling of Metallic and
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Inorganic Coatings
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
B849 Specification for Pre-Treatments of Iron or Steel for
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Reducing Risk of Hydrogen Embrittlement
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B700−08 (2014)
stated function of the coating and are acceptable to the purchaser (see
B850 GuideforPost-CoatingTreatmentsofSteelforReduc-
Appendix X1).
ing the Risk of Hydrogen Embrittlement
D3951 Practice for Commercial Packaging
4.3 SurfaceAppearance—
...

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Platinum  
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