Anodisation and Surface treatments

---

Anodizing

MIL-A-8625 is the military specification titled Anodic Coatings for Aluminium and Aluminium Alloys.

MIL-A-8625 is approved for use by all Departments and Agencies of the Department of Defence.

MIL-A-8625, Type II, Class 1  Sulphuric acid anodizing, conventional coatings produced from a sulphuric acid bath, Non-dyed

MIL-A-8625, Type II, Class 2  Sulphuric acid anodizing, conventional coatings produced from a sulphuric acid bath, Dyed

MIL-A-8625, Type III, Class 1  Hard Anodic Coatings, Non-dyed

MIL-A-8625, Type III, Class 2  Hard Anodic Coatings, Dyed


The chemical conversion coating types :

MIL-DTL-5541F (MIL-C-5541E), TYPE 1,Class 1A*

MIL-DTL-5541F (MIL-C-5541E), TYPE 1,Class 3 **

MIL-DTL-5541F (MIL-C-5541E), TYPE 2,Class 1A (ROHS)

MIL-DTL-5541F (MIL-C-5541E), TYPE 2,Class 3 (ROHS)

Clear Chromate per ASTM B449-93, Class III 


* Class 1A : for maximum protection against corrosion, for surfaces to be painted or left unpainted

** Class 3 : for protection against corrosion where low electrical resistance is required