What is Anodizing?
Anodizing is a process for finishing aluminum alloys that employs electrolytic oxidation of the aluminum surface to produce a protective oxide coating. The anodic coating consists of hydrated aluminum oxide. It is considered resistant to corrosion and abrasion. Conventional coatings are 0.1 to 1.0 mils thick and are mostly transparent, but may be colored.
What is Chemical Conversion?
Chemical conversion coatings are intended to prevent corrosion, improve adhesion of paint finish or other coatings, and for improved electrical and electronic applications where low resistance contacts are required. The primary difference between a Class 1A and Class 3 coating is thickness, since current passes more readily through a thinner current resistant barrier (coating). Class 3 is thinner.
Avoid the following when designing for an anodized finish: