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ASTM B921-08(2013)

Historical Reaffirmation

Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys

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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.


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.


SDO ASTM: ASTM International
Document Number B921
Publication Date May 1, 2013
Language en - English
Page Count 3
Revision Level 08(2013)
Supercedes
Committee B08.07
Publish Date Document Id Type View
April 1, 2008 B0921-08 Revision
Sept. 10, 2002 B0921-02 Revision
Nov. 1, 2023 B0921-08R23 Reaffirmation
Oct. 1, 2018 B0921-08R18 Reaffirmation
May 1, 2013 B0921-08R13 Reaffirmation