Standard Specification for Electrodeposited Engineering Chromium Coatings on Ferrous Substrates

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.
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.

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Historical
Publication Date
09-Nov-1995
Current Stage
Ref Project

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ASTM B650-95(2002) - Standard Specification for Electrodeposited Engineering Chromium Coatings on Ferrous Substrates
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 650 – 95 (Reapproved 2002)
Standard Specification for
Electrodeposited Engineering Chromium Coatings on
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Ferrous Substrates
This standard is issued under the fixed designation B 650; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope Coating Thicknesses by Microscopical Examination of a
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Cross Section
1.1 This specification covers the requirements for electrode-
B 499 Test Method for Measurement of Coating Thick-
posited chromium coatings applied to ferrous alloys for engi-
nessesbytheMagneticMethod:NonmagneticCoatingson
neering applications.
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Magnetic Basis Metals
1.2 Electrodepositedengineeringchromium,whichissome-
B 504 Test Method for Measurement of Thickness of Me-
times called “functional” or “hard” chromium, is usually
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tallic Coatings by the Coulometric Method
applied directly to the basis metal and is much thicker than
B 507 PracticeforDesignofArticlestoBeElectroplatedon
decorative chromium. Engineering chromium is used for the
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Racks
following:
B 568 Test Method for Measurement of Coating Thickness
1.2.1 To increase wear and abrasion resistance,
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by X-Ray Spectrometry
1.2.2 To increase fretting resistance,
B 571 Practice for QualitativeAdhesion Testing of Metallic
1.2.3 To reduce static and kinetic friction,
3
Coatings
1.2.4 To reduce galling or seizing, or both, for various metal
B 602 Test Method for Attribute Sampling of Metallic and
combinations,
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Inorganic Coatings
1.2.5 To increase corrosion resistance, and
B 697 Guide for Selection of Sampling Plans for Inspection
1.2.6 To build up undersize or worn parts.
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of Electrodeposited Metallic and Inorganic Coatings
1.3 This standard does not purport to address all of the
B 762 Test Method of Variables Sampling of Metallic and
safety concerns, if any, associated with its use. It is the
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Inorganic Coatings
responsibility of the user of this standard to establish appro-
B 849 Specification for Pre-Treatments of Iron or Steel for
priate safety and health practices and determine the applica-
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Reducing the Risk of Hydrogen Embrittlement
bility of regulatory limitations prior to use.
B 850 Guide for Post-Coating Treatments of Steel for Re-
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2. Referenced Documents ducing Risk of Hydrogen Embrittlement
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D 3951 Practice for Commercial Packaging
2.1 ASTM Standards:
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2
E 8 TestMethodsforTensionTestingofMetallicMaterials
B 117 Practice for Operating Salt Spray (Fog) Apparatus
3
F 1459 Test Method for Determination of the Susceptibility
B 177 Guide for Engineering Chromium Electroplating
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ofMetallicMaterialstoGaseousHydrogenEmbrittlement
B 183 Practice for Preparation of Low-Carbon Steel for
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2.2 Other Standard:
Electroplating
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MIL-S-13165 Shot Peening of Metal Parts
B 242 Guide for Preparation of High-Carbon Steel for
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Electroplating
3. Terminology
B 320 Practice for Preparation of Iron Castings for Electro-
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3.1 Definitions:
plating
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3.1.1 significant surfaces—all surfaces upon which a de-
B 374 Terminology Relating to Electroplating
posit of controlled thickness is required.
B 487 Test Method for Measurement of Metal and Oxide
3.1.1.1 Discussion—When a controlled deposit is required
in holes, corners, recesses, and similar areas, special racking,
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This specification is under the jurisdiction of ASTM Committee B08 on
Metallic and Inorganic Coatingsand is the direct responsibility of Subcommittee
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B08.08.01on Engineering Coatings. Annual Book of ASTM Standards, Vol 15.09.
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Current edition approved Nov. 10, 1995. Published January 1996. Originally Annual Book of ASTM Standards, Vol 03.01.
e1 6
published as B 650 – 78. Last previous edition B 650 – 93 . Annual Book of ASTM Standards, Vol 15.03.
2 7
Annual Book of ASTM Standards, Vol. 03.02 AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
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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.
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B 650
auxiliary anodes or shielding, or both, will be necessary. With unless other arrangements have been made between the pur-
the best practices there will be areas where a controlled deposit chaser and the electroplating facility.
is impossible.
3.2 Definitions used in this specification are in accordance 6. Coating Requirements
with Terminology B 374.
6.1 The appearance of the chromium coating on the signifi-
cant surfaces of the product shall be smooth and free
...

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