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ASTM B634-88(1999)

(Specification)

Standard Specification for Electrodeposited Coatings of Rhodium for Engineering Use

Standard Specification for Electrodeposited Coatings of Rhodium for Engineering Use

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 XI covers some typical applications for electrodeposited rhodium.
1.4 This standard does not purport to address all of the safety problems 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-Dec-1998
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.04 - Precious Metal Coatings
Current Stage
Ref Project

Relations

Replaced By
ASTM B634-88(2004)e1 - Standard Specification for Electrodeposited Coatings of Rhodium for Engineering Use
Effective Date
01-Apr-2004
Referred By
ASTM B605-22 - Standard Specification for Electrodeposited Coatings of Tin-Nickel Alloy
Effective Date
01-Jan-1999

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ASTM B634-88(1999) - Standard Specification for Electrodeposited Coatings of Rhodium for Engineering UseASTM B634-88(1999) - Standard Specification for Electrodeposited Coatings of Rhodium for Engineering Use
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ASTM B634-88(1999) - Standard Specification for Electrodeposited Coatings of Rhodium 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 634 – 88 (Reapproved 1999)
Standard Specification for
Electrodeposited Coatings of Rhodium for Engineering Use
This standard is issued under the fixed designation B 634; 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 481 Practice for Preparation of Titanium and Titanium
Alloys for Electroplating
1.1 This specification covers requirements for electrodepos-
B 482 Practice for Preparation of Tungsten and Tungsten
ited coatings of rhodium used for engineering purposes.
Alloys for Electroplating
1.2 Coatings of rhodium covered by this specification are
B 487 Test Method for Measurement of Metal and Oxide
usually employed for their corrosion resistance, stable electri-
Coating Thicknesses by Microscopical Examination of a
cal contact resistance, wear resistance, reflectivity, and heat
Cross Section
resistance.
B 507 Practice for Design of Articles to Be Electroplated on
1.3 Appendix X1 covers some typical applications for
Racks
electrodeposited rhodium.
B 567 Test Method for Measurement of Coating Thickness
1.4 This standard does not purport to address all of the
by the Beta Backscatter Method
safety concerns, if any, associated with its use. It is the
B 568 Test Method for Measurement of Coating Thickness
responsibility of the user of this standard to establish appro-
by X-Ray Spectrometry
priate safety and health practices and determine the applica-
B 571 Test Methods for Adhesion of Metallic Coatings
bility of regulatory limitations prior to use.
B 602 Test Method for Attribute Sampling of Metallic and
2. Referenced Documents Inorganic Coatings
B 697 Guide for Selection of Sampling Plans for Inspection
2.1 The following documents form a part of this document
of Electrodeposited Metallic and Inorganic Coatings
to the extent referenced herein.
B 762 Method of Variables Sampling of Metallic and Inor-
2.2 ASTM Standards:
ganic Coatings
B 183 Practice for Preparation of Low-Carbon Steel for
E 8 Test Methods of Tension Testing of Metallic Materials
Electroplating
2.3 Military Standards:
B 242 Practice for Preparation of High-Carbon Steel for
MIL-R-46085 Rhodium Plating, Electrodeposited
Electroplating
QQ-N-290 Nickel Plating, Electrodeposited
B 252 Guide for Preparation of Zinc Alloy Die Castings for
Electroplating and Conversion Coatings
3. Classification
B 254 Practice for Preparation of and Electroplating on
3.1 Electrodeposited coatings of rhodium on the basis of
Stainless Steel
thickness are classified as follows:
B 281 Practice for Preparation of Copper and Copper-Base
Class Minimum Thickness, μm
Alloys for Electroplating and Conversion Coatings
0.05 0.05
B 322 Practice for Cleaning Metals Prior to Electroplating
0.25 0.25
B 343 Practice for Preparation of Nickel for Electroplating 0.5 0.5
with Nickel
2.5 2.5
B 456 Specification for Electrodeposited Coatings of Cop-
6.2 6.25
per Plus Nickel Plus Chromium and Nickel Plus Chro-
4. Ordering Information
mium
4.1 To make application of this standard complete, the
purchaser needs to supply the following information to the
seller in the purchase order or other governing document:
This specification is under the jurisdiction of ASTM Committee B08 on
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
B08.08.02 on Precious Metal Coatings.
Current edition approved Aug. 26, 1988. Published March 1989. Originally Annual Book of ASTM Standards, Vol 03.01.
published as B 634 – 78. Last previous edition B 634 – 78. Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Annual Book of ASTM Standards, Vol 02.05. 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.
B 634 – 88 (1999)
4.1.1 Name, designation, and year of issue of this standard, necessary, the significant surfaces shall be indicated on the
4.1.2 Class including a maximum thickness, if appropriate drawings of the parts, or by the provision of suitably marked
samples.
(3.1),
4.1.3 Nature of substrate, for example, high strength steel,
NOTE 2—Variation in the coating thickness from point-to-point on a
need for stress relief, undercoats, embrittlement relief (5.1, 5.2,
coated article is an inherent characteristic of electroplating processes.
5.3),
Therefore, the coating thickness will have to exceed the specified value at
4.1.4 Significant surfaces (6.2), some points on the significant surfaces to ensure that the thickness equals
or exceeds the specified value at all points. Therefore, the average coating
4.1.5 Appearance (6.3),
thickness on an article will usually be greater than the specified value; how
4.1.6 Requirements and methods of testing for one or more
much greater is largely determined by the shape of the article (see Practice
of the following requirements: need for and type of test
B 507) and the characteristics of the electroplating process. Additionally,
specimens (8.1); thickness (8.2); adhesion (8.3); absence of
the average coating thickness on an article will vary from article to article
embrittlement (8.4); reflectivity (8.5); and undercoats (S1.4),
within a production lot. If all of the articles in a production lot are to meet
and the thickness requirement, the average coating thickness of the production
lot as a whole will be greater than the average necessary to ensure that a
4.1.7 Sampling plans (Section 7) and quality assurance
single article meets the requirements.
(S1.2).
6.4 Appearance:
6.4.1 Electroplated coatings shall completely cover all sur-
5. Process Requirements
faces as specified in the manufacturing document and shall
5.1 Preparatory Procedures—The basis metal shall be sub-
have a uniform appearance to the extent that the nature of the
jected to such cleaning procedures as are necessary to ensure a
basis metal and good commercial practices permit.
surface satisfactory for subsequent electroplating. Materials
6.4.2 Defects in the surface of the basis metal such as
used for cleaning shall have no damaging effects on the basis
scratches, pits, nonconducting inclusions, and roll and die
metal resulting in pits, intergranular attack, stress corrosion
marks, may adversely affect the appearance and performance
cracking, or hydrogen embrittlement.
of the applied coatings. Such defects that persist in the finish
NOTE 1—For basis metal preparations, the following appropriate
despite the observance of good metal finishing practices shall
ASTM standards are recommended: Practices B 183, B 242, B 252,
not be cause for rejection.
B 254, B 281, B 322, B 343, B 481, and B 482.
NOTE 3—Applied finishes generally perform better in service when the
5.2 Preplating Operations:
substrate over which they are applied is smooth and free from torn metal,
5.2.1 Electroplating shall be applied after all basis metal
inclusions, pores, and other defects. It is recommended that the specifi-
heat treatments and mechanical operations such as forming, cations covering the unfinished product provide limits for those defects. A
metal finisher often can remove defects through special treatments such as
machining, and joining of the article have been completed.
grinding, polishing, abrasive blasting, chemical treatments, and elec-
5.2.2 Stress Relief Treatment—All steel parts having an
tropolishing. However, these are not normal in the treatment steps
ultimate tensile strength of 1050 MPa (approximately 35 HRC)
preceding the application of the finish. When they are desired, they are the
and above and that have been machined, ground, cold formed,
subject of special agreement between the purchaser and the supplier.
or cold straightened shall have heat treatment to 190 615°C for
6.5 Adhesion—The rhodium coatings shall be free of blis-
a minimum of 5 h before cleaning and electroplating.
ters and peeled areas when tested in accordance with 8.3.
5.3 Post-Plating Procedures:
5.3.1 Embrittlement Relief—Steel parts having an ultimate
7. Sampling
tensile strength of 1200 MPa (approximately 38 HRC) or
7.1 A random sample of the size required by Test Methods
greater shall be baked at 190 615°C for a minimum of 8 h
B 602 or B 762 shall be selected from the inspection lot (see
within 4 h after electroplating to provide hydrogen embrittle-
7.2). The articles in the lot shall be inspected for conformance
ment relief. Steel parts having an ultimate tensile strength
to the requirements of this specification and the lot shall be
greater than 1300 MPa (approximately 40 HRC) shall be baked
classified as conforming or nonconforming to each requirement
at 190 615°C for a minimum of 23 h within 4 h after
according to the criteria of the sampling plans in Test Method
electroplating.
B 602.
6. Coating Requirements
NOTE 4—Test Method B 602 contains four sampling plans, three for
use with nondestructive test methods. The fourth is to be used with
6.1 Nature of Coating—The coating shall be essentially
destructive test methods. The three methods for nondestructive tests differ
pure rhodium produced by electrodeposition from aqueous
in the quality level they require of the product. Test Method B 602
electrolytes.
requires use of the plan with the intermediate quality level unless the
6.2 Thickness—The rhodium coating thickness on all sig-
purchaser specifies otherwise. It is recommended that the purchaser
compare the plans with his needs and state which plan is to be used. If the
nificant surfaces shall conform to the requirements of the
plans in Test Method B 602 do not serve the needs, additional ones are
specified class as defined in Section 3.
given in Guide B 697 which provid
...

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Approximate Hardness (HK25)  
Gold  
50–250  
Palladium  
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Platinum  
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Palladium-Nickel  
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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.  
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SCOPE
1.1 This specification covers the requirements for electrodeposited chromium coatings applied to ferrous alloys for engineering applications.  
1.2 Electrodeposited engineering chromium, which is sometimes called “functional” or “hard” chromium, is usually applied directly to the basis metal and is much thicker than decorative chromium. Engineering chromium is used for the following:  
1.2.1 To increase wear and abrasion resistance,  
1.2.2 To increase fretting resistance,  
1.2.3 To reduce static and kinetic friction,  
1.2.4 To reduce galling or seizing, or both, for various metal combinations,  
1.2.5 To increase corrosion resistance, and  
1.2.6 To build up undersize or worn parts.  
1.3 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.  
1.4 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
    5 pages
    English language
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  • Technical specification
    5 pages
    English language
    sale 15% off