Electro-Polish Co

Chem Film

Chemfilm is a “chemical conversion coating formed by the reaction of chemical conversion materials and the bare surfaces (not alclad) of aluminum alloys.” It is used primarily for aluminum and aluminum alloys where increased corrosion resistance, improved paint adhesion, and a low electrical resistance coating is required. It is also useful for improving the corrosion resistance and paint adhesion properties of a braded or discontinuous anodized surfaces of aluminum and aluminum alloy parts.

There are two classes of coating:

Class I-A

This is a thick coating for use as a final finish or pre-treatment to paint or powder coating. This is gold, brown or yellow depending on coating weight and alloy. Also provides maximum protection against corrosion, painted or unpainted.

Class III

This is a thin coating for low contact resistance. The coating weight lower as is the corrosion resistance. There may be some advantages using this thinner film in bonding applications. This film will appear to be a lighter color of gold.