Anodizing is an electrochemical conversion process that forms an oxide film, usually on aluminum, in an electrolyte (chemical solution). The aluminum parts are the anode (thus the term “anodizing”) and current is passed between them and a cathode, usually flat aluminum bars, through the above mentioned electrolyte (sulfuric acid is most commonly used). There are different types of anodize, most commonly referred to as *Type I-Chromic Acid Anodize, Type II-Sulfuric Acid Anodize, and Type III Hard Anodize or Hardcoat from the Mil-A-8625 designation. Other less common types are phosphoric acid and titanium anodize. The anodize is a porous structure that grows out of the base aluminum and absorbs colored dye very well. This is done through a secondary operation with either an organic or inorganic coloring. Elite Metal Finishing processes black, blue, red, gold, grey, blue grey, yellow, green, desert sand and purple colored anodize. Custom colors on request.
The sulfuric acid process is the most common method for anodizing. The sulfuric acid anodize process films range from .0001"-.001" thick. The overall thickness of the coating formed is 67 percent penetration in the substrate and 33 percent growth over the original dimension of the part.
* Elite Metal Finishing does not offer Type I Chromic Acid Anodize
We have been working with OEM’s and machine shops for the past 18 years.
Elite Metal Finishing has helped companies such as ViaSat, Direct Aero Systems and Pentair Electronics address these problems.
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