ASTM B921-08
Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys

Standard No.

ASTM B921-08

Release Date

2008

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM B921-08(2013)

Latest

ASTM B921-08(2023)

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.

ASTM B921-08 Referenced Document

• ASTM B117 Standard Practice for Operating Salt Spray (Fog) Apparatus
• ASTM B602 Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
• ASTM D1730 Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting
• ASTM D3359 Standard Test Methods for Measuring Adhesion by Tape Test
• ISO 2409 Paints and varnishes — Cross-cut test
• ISO 3768 Metallic coatings — Neutral salt spray test (NSS test)
• ISO 4519 Electrodeposited metallic coatings and related finishes; Sampling procedures for inspection by attributes

ASTM B921-08 history

• 2023 ASTM B921-08(2023) Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys
• 2018 ASTM B921-08(2018) Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys
• 2008 ASTM B921-08(2013) Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys
• 2008 ASTM B921-08 Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys
• 2002 ASTM B921-02 Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys