ASTM-F1941M Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Metric] (Withdrawn 2015)

ASTM-F1941M - 2007 EDITION - SUPERSEDED -- See the following: ASTM-F1941
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This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. The coating material, coating thickness, chromate finish, and trivalent chromite finish shall be selected and designated. The electrodeposited coating shall cover all surfaces and shall meet the following requirements: the coating metal deposit shall be bright or semibright, smooth, fine grained, adherent and uniform in appearance; the coating shall be free of blisters, pits, nodules, roughness, cracks, unplated areas, and other defects that will affect the function of the coating; and the coating shall not be stained, discolored or exhibit any evidence of white or red corrosion products. Slight discoloration that results from baking, drying, or electrode contact during rack-plating, or all of these, as well as slight staining that results from rinsing shall not be cause for rejection. Corrosion resistance and embrittlement of coatings shall be determined by performing mechanical tests.

ORDER

Scope

1.1 This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.

1.2 The following precautionary statement pertains to the test method portion only, Section 9, 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.

Keywords

chromate finish; electrodeposited coating; fasteners; hydrogen embrittlement relief; hydrogen embrittlement testing; surface treatment; Electrodeposited coatings; Screw thread; Threaded fasteners; Unified inch screw threads (UN/UNR); ICS Number Code 21.060.01 (Fasteners in general); 25.220.40 (Metallic coatings)

To find similar documents by ASTM Volume:

01.08 (Fasteners; Rolling Element Bearings)

To find similar documents by classification:

21.060.01 (Fasteners in general)

25.220.40 (Metallic coatings Including electrolytic depositions, cathodic coatings, autocatalytic coatings, etc.)

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Document Number

ASTM-F1941M-07

Revision Level

2007 EDITION

Status

Superseded

Modification Type

Replaced

Publication Date

Dec. 1, 2007

Document Type

Specification

Page Count

12 pages

Committee Number

F16.03