When aluminum is exposed to the atmosphere it will naturally form an amorphous oxide layer. This forms a corrosion resistant, relatively non-reactive, insulating layer on the surface. By applying a current to the aluminum in an electrolyte bath, a uniform crystallized layer of oxide can be formed that has enhanced corrosion resistance compared to the naturally occurring amorphous oxide layer.
We offer aluminum anodizing services compliant with MIL-A-8625 Type II Class 1 or Class 2 for many aluminum alloys. Class 1 is a standard sulfuric acid anodize with a clear, natural finish typically sealed in a hot water bath. Class 2 is the same process with a dyed finish and typically sealed with a nickel acetate bath. This provides the same corrosion resistance but can be used for color coded or decorative applications. We offer black and red colors as standard with other colors available upon request.