ASTM B921-08(2023)

Podrobné informácie

Označenie: ASTM B921-08(2023)

Dátum vydania: 01.11.2023

Stránok: 3

Krajina: Americká technická norma

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Anotácia

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.


Keywords:
conversion coating, non-hexavalent chromium conversion coating, non-rinsed, rinsed,, ICS Number Code 77.120.10 (Aluminium and aluminium alloys)