Chicago Plating, Inc.
(630)718-1600 Fax: (
P.O. Box 164
Bill Crawford, President
E-Mail: bill@chicagoplating.com
Anodizing
MIL-A-8625
Anodizing
is an electrically applied oxide layer on the surface of an aluminum part. The
most common specification is MIL-A-8625, which has three types. Type I Chromic
Acid is the oldest type of anodizing and is rarely used. There are some
aerospace applications for use as a paint base.
Type II Sulfuric Acid is clear when applied but the porous surface can
be dyed many colors. Type III Sulfuric
Acid Hard Coat has a different grain structure than Type II. Thicknesses of
.001” to .0025” are common. It is a dark green as produced, but can be dyed
black.