ASTM B634-14a

Standard Specification for Electrodeposited Coatings of Rhodium for Engineering Use

ABSTRACT
This specification covers the requirements for electrodeposited rhodium coatings for engineering applications, usually employed for their corrosion resistance, stable electrical contact resistance, wear resistance, reflectivity, and heat resistance. Coating shall be classified based on their thickness. Specimens shall undergo preparatory preplating procedures such as surface cleaning and stress relief treatment, as well as post-plating embrittlement relief process. Coatings shall be sampled, tested, and conform accordingly to specified requirements as to purity, appearance, adhesion, hydrogen embrittlement, reflectivity, and thickness (to be measured either nondestructively by beta backscatter method or X-ray fluorescence, or destructively by microscopical cross sectioning method).
SCOPE
1.1 This specification covers requirements for electrodeposited coatings of rhodium used for engineering purposes.  
1.2 Coatings of rhodium covered by this specification are usually employed for their corrosion resistance, stable electrical contact resistance, wear resistance, reflectivity, and heat resistance.  
1.3 Appendix X1 covers some typical applications for electrodeposited rhodium.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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-Oct-2014
• ICS: 25.220.40 - Metallic coatings
• Technical Committee: B08 - Metallic and Inorganic Coatings
• Drafting Committee: B08.04 - Precious Metal Coatings

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B634 −14a
Standard Specification for
1
Electrodeposited Coatings of Rhodium for Engineering Use
This standard is issued under the fixed designation B634; 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 B252 Guide for Preparation of Zinc Alloy Die Castings for
Electroplating and Conversion Coatings
1.1 This specification covers requirements for electrodepos-
B254 Practice for Preparation of and Electroplating on
ited coatings of rhodium used for engineering purposes.
Stainless Steel
1.2 Coatings of rhodium covered by this specification are
B281 Practice for Preparation of Copper and Copper-Base
usually employed for their corrosion resistance, stable electri-
Alloys for Electroplating and Conversion Coatings
cal contact resistance, wear resistance, reflectivity, and heat
B322 Guide for Cleaning Metals Prior to Electroplating
resistance.
B343 Practice for Preparation of Nickel for Electroplating
1.3 Appendix X1 covers some typical applications for with Nickel
B456 Specification for Electrodeposited Coatings of Copper
electrodeposited rhodium.
Plus Nickel Plus Chromium and Nickel Plus Chromium
1.4 The values stated in SI units are to be regarded as
B481 Practice for Preparation of Titanium and Titanium
standard. No other units of measurement are included in this
Alloys for Electroplating
standard.
B482 Practice for Preparation of Tungsten and Tungsten
1.5 This standard does not purport to address all of the
Alloys for Electroplating
safety concerns, if any, associated with its use. It is the
B487 Test Method for Measurement of Metal and Oxide
responsibility of the user of this standard to establish appro-
Coating Thickness by Microscopical Examination of
priate safety and health practices and determine the applica-
Cross Section
bility of regulatory limitations prior to use.
B507 Practice for Design of Articles to Be Electroplated on
Racks
2. Referenced Documents
B567 Test Method for Measurement of Coating Thickness
2.1 The following documents form a part of this document by the Beta Backscatter Method
B568 Test Method for Measurement of Coating Thickness
to the extent referenced herein.
2 by X-Ray Spectrometry
2.2 ASTM Standards:
B571 Practice for Qualitative Adhesion Testing of Metallic
B183 Practice for Preparation of Low-Carbon Steel for
Coatings
Electroplating
B602 Test Method for Attribute Sampling of Metallic and
B242 Guide for Preparation of High-Carbon Steel for Elec-
Inorganic Coatings
troplating
B697 Guide for Selection of Sampling Plans for Inspection
of Electrodeposited Metallic and Inorganic Coatings
B762 Test Method of Variables Sampling of Metallic and
1
This specification is under the jurisdiction of ASTM Committee B08 on
Inorganic Coatings
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
E8 Test Methods for Tension Testing of Metallic Materials
B08.04 on Precious Metal Coatings.
2.3 Military Standards:
Current edition approved Nov. 1, 2014. Published November 2014. Originally
3
approved in 1978. Last previous edition approved in 2014 as B634 – 14. DOI:
MIL-R-46085 Rhodium Plating, Electrodeposited
3
10.1520/B0634-14A.
QQ-N-290 Nickel Plating, Electrodeposited
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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B634−14a
3. Classification greaterthan1300MPa(approximately40HRC)shallbebaked
at 190 6 15°C for a minimum of 23 h within 4 h after
3.1 Electrodeposited coatings of rhodium on the basis of
electroplating.
thickness are classified as follows:
Class Minimum Thickness, µm
6. Coating Requirements
0.05 0.05
0.25 0.25
6.1 Nature of Coating—Thecoatingshallbeessentiallypure
0.5 0.5
rhodium produced by electrodeposition from aqueous electro-
11
lytes.
2.5 2.5
6.25 6.25
6.2 Thickness—The rhodium coating thickness on all sig-
NOTE 1—Previous revisions of B634 included Class 6.2. Any require-
nificant surfaces shall conform to the requirements of the
ments for B634 Class 6.2 shall be required to meet the same requirements
specified class as defined in Section 3.
now within Class 6.25.
6.3 Significant Surfaces—Significant surfaces are defined as
4. Ordering Information
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B634 − 14 B634 − 14a
Standard Specification for
1
Electrodeposited Coatings of Rhodium for Engineering Use
This standard is issued under the fixed designation B634; 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
1.1 This specification covers requirements for electrodeposited coatings of rhodium used for engineering purposes.
1.2 Coatings of rhodium covered by this specification are usually employed for their corrosion resistance, stable electrical
contact resistance, wear resistance, reflectivity, and heat resistance.
1.3 Appendix X1 covers some typical applications for electrodeposited rhodium.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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.
2. Referenced Documents
2.1 The following documents form a part of this document to the extent referenced herein.
2
2.2 ASTM Standards:
B183 Practice for Preparation of Low-Carbon Steel for Electroplating
B242 Guide for Preparation of High-Carbon Steel for Electroplating
B252 Guide for Preparation of Zinc Alloy Die Castings for Electroplating and Conversion Coatings
B254 Practice for Preparation of and Electroplating on Stainless Steel
B281 Practice for Preparation of Copper and Copper-Base Alloys for Electroplating and Conversion Coatings
B322 Guide for Cleaning Metals Prior to Electroplating
B343 Practice for Preparation of Nickel for Electroplating with Nickel
B456 Specification for Electrodeposited Coatings of Copper Plus Nickel Plus Chromium and Nickel Plus Chromium
B481 Practice for Preparation of Titanium and Titanium Alloys for Electroplating
B482 Practice for Preparation of Tungsten and Tungsten Alloys for Electroplating
B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section
B507 Practice for Design of Articles to Be Electroplated on Racks
B567 Test Method for Measurement of Coating Thickness by the Beta Backscatter Method
B568 Test Method for Measurement of Coating Thickness by X-Ray Spectrometry
B571 Practice for Qualitative Adhesion Testing of Metallic Coatings
B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings
B697 Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings
B762 Test Method of Variables Sampling of Metallic and Inorganic Coatings
E8 Test Methods for Tension Testing of Metallic Materials
2.3 Military Standards:
3
MIL-R-46085 Rhodium Plating, Electrodeposited
3
QQ-N-290 Nickel Plating, Electrodeposited
1
This specification is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.04 on
Precious Metal Coatings.
Current edition approved Sept. 1, 2014Nov. 1, 2014. Published September 2014November 2014. Originally approved in 1978. Last previous edition approved in 20092014
as B634 – 88 (2009).B634 – 14. DOI: 10.1520/B0634-14.10.1520/B0634-14A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B634 − 14a
3. Classification
3.1 Electrodeposited coatings of rhodium on the basis of thickness are classified as follows:
Class Minimum Thickness, μm
0.05 0.05
0.25 0.25
0.5 0.5
1 1
2.5 2.5
6.25 6.25
NOTE 1—Previous revisions of B634 included Class 6.2. Any requirements for B634 Class 6.2 shall be required to meet the same requirements now
within Class 6.25.
4. Ordering Information
4.1 To make application of this standard complete, the purchaser needs to supply the following information to the seller
...