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ASTM-B921:2008 Edition(Redline)

ASTM-B921:2008 Edition(Redline)

$23.40

B921-08 Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys (Redline)

Published By Publication Date Number of Pages
ASTM 2008 3
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Abstract

This specification covers the requirements relating to rinsed and non-rinsed non-hexavalent chromium conversion coatings on aluminum and aluminum alloys intended to retard corrosion; as a base for organic films including paints, plastics, and adhesives; and as.a protective coating having a low electrical contact impedance. Coatings are categorized into four classes according to corrosion protection and finish. The type of conversion coating depends on the composition of the solution and may also be affected by pH, temperature, duration of the treatment, and the nature and surface condition. Films are normally applied by dipping, but may also be applied by inundation, spraying, roller coating, or by wipe-on techniques. Coatings shall adhere to specified electrical resistance, adhesion, and corrosion resistance requirements.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification covers the requirements relating to rinsed and non-rinsed non-hexavalent chromium conversion coatings on aluminum and aluminum alloys intended to give protection against corrosion and as a base for other coatings.

1.2 Aluminum and aluminum alloys are conversion coated in order to retard corrosion; as a base for organic films including paints, plastics, and adhesives; and as a protective coating having a low electrical contact impedance.

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 and health practices and determine the applicability of regulatory requirements prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

B117 Practice for Operating Salt Spray (Fog) Apparatus B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings D1730 Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting D3359 Test Methods for Measuring Adhesion by Tape Test

ISO Standards

ISO4519 Electrodeposited Metallic Coatings and Related FinishesSampling Procedures for Inspection by Attributes

Federal Standard

Fed.Std.No.141 Paints, Varnish, Lacquer, and Related Materials; Methods of Inspection Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.

Military Specification

MIL-DTL-81706 Chemical Conversion Materials For Coating Aluminum and Aluminum Alloys

Keywords

conversion coating; non-hexavalent chromium conversion coating; non-rinsed; rinsed; Aluminum; Aluminum alloys; Chromium coatings–specifications; Conversion coatings–specifications; Corrosion-resistant coatings; Nonhexavalent chromium conversion coatings; Nonrinsed nonhexavalent chromium conversion coatings; Rinsed nonhexavalent chromium conversion coatings;

ICS Code

ICS Number Code 77.120.10 (Aluminium and aluminium alloys)

DOI: 10.1520/B0921-08 ASTM International is a member of CrossRef.

Citing ASTM Standards

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