Chromic Anodize (MIL-A-8625)
Referred to as Type I anodize or Type IB (Low voltage process). Chromic anodize is dark gray in color or can be dyed black. Chromic Anodize has a thin coating (usually less than .0001”), although don’t be fooled by the thin layer, Chromic Anodize has equal corrosion protection as Sulfuric Anodize and Hard coat Anodize.
Chromic Anodize is most commonly utilized in the Aerospace and machining industries. Parts that require strict dimensional tolerances, welding or bonding are generally suitable for the Chromic Anodize process.