ASTM B921-08(2013) - 1.5.2013
 
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

ISO 4519

Electrodeposited Metallic Coatings and Related Finishes--Sampling Procedures for Inspection by Attributes

MIL-DTL-5541

Chemical Conversion Coatings on Aluminum and Aluminum Alloys

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, http://dodssp.daps.dla.mil.

MIL-DTL-81706

Chemical Conversion Materials For Coating Aluminum and Aluminum Alloys

B117-26a

Standard Practice for Operating Salt Spray (Fog) Apparatus (Includes all amendments and changes 9/22/2026).

B602-21

Standard Guide for Attribute Sampling of Metallic and Inorganic Coatings

D1730-09(2020)

Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting

D3359-23

Standard Test Methods for Rating Adhesion by Tape Test

ISO 3768

Metallic Coatings--Neutral Salt Spray Test (NSS Test)

ISO 2409

Paint and Varnishes--Cross-Cut Test Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.