Type III PRECISION SULFURIC ACID
ANODIZING
AKA "Hardcoat, Hard Anodize"
This Finish is RoHS Compliant
( Per Mil-A-8625 Type III Class 1 & Class 2)
Hardcoat Anodizing is an electrochemical process that forms a non-conductive
oxide coating on the surface. The coating will penetrate the surface of
the aluminum up to 50 % of the overall thickness. When aluminum alloys are hard anodized an
oxide coating is formed that grows from the base metal and leaves a very hard
corrosion resistant coating with excellent wear properties. The presence of
pores in the oxide coating allows the surface to be colored by using organic
dyes and then sealed to enhance its corrosion resistance. The color of the
coating is designated by the Class.
Keep in mind, that due to the dark mauve to grayish color, (depending upon
the alloy), of the natural hardcoat, many colors, other than black, will
not be cosmetically effective.
A Class 1 finish
is the natural color of the oxide coating
A Class 2
finish is usually dyed black.
Our strict quality control measures will ensure that your parts will be
consistent in color from one order to the next.
* When color matching is important we highly recommend using the same alloy
on all parts.
The oxide coating from sulfuric acid hard anodizing of this Type III is controlled
to a total thickness in the range .0005" to .0025" or .5 to 2.5 mils.
MIL-A-8625:
Anodic Coatings for Aluminum and Aluminum Alloys
TYPE III - CONVENTIONAL SULFURIC
ACID ANODIZING
Class 1 - Non-dyed coatings
Class 2 -
Dyed Coatings
MIL-A-63576: Aluminum
Oxide Coatings, Lubricative, for Aluminum and Aluminum Alloys
Type I
- Anodic coating impregnated with
PTF
CLICK HERE to see a picture of our Anodizing
and Hardcoat tanks.
CLICK HERE to download Mil-8625F Specification in
PDF Format