Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Suitable bath for hard anodising
which is suitable bath for hard anodising.
10% sulfuric or sulfuric& oxalic acid.
what difference in coating properties?
we need 25 micron hard anodising.
Shrikrupa ind - Ahamadnagar, INDIA
2007
Hard coat is typically done at 20% by weight sulfuric acid,with book values of 12 to 22%. 0 Centigrade constant temperature and well mixed solution for temperature uniformity. 25 microns is a bit unusual with engineering hardcoat starting at 50. Other applications go as low as 8.
Some people use an addition of Oxalic acid for "a better coat" but it typically requires a superimposed sine current. There are what some of us refer to as type 2 1/2 anodize which uses an additive that will allow a psuedo hardcoat at higher temperatures.
- Navarre, Florida
2007
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