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Because anodizing is a conversion coating, and relies on the aluminum substrate being converted to aluminum oxide, any defects in the aluminum will have marked effects on the quality of the anodizing. The basic rule to remember is that the aluminum finish must be consistent, clean and fully exposed for the anodic layer to form properly.

http://anodizeinc.com/2017/05/12/defects-in-metal-and-their-effects-on-anodizing/
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Interested in learning more about the care and cleaning of anodized parts?
Anodizing is surprisingly durable and resilient to corrosion. However, like its aluminum base, it is susceptible to strong alkalines, such as Lye or Sodium Hydroxide. It also can be damaged by strong acids, such as nitric or sulfuric. Beware of strong alkaline cleaners, which often contain ammonia or lye, as well as masonry or cement cleaners, which can contain strong acids.

http://anodizeinc.com/2017/04/20/care-and-cleaning-of-anodizing/
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“Clear” anodizing is really a misnomer, as undyed anodizing is not really clear.

http://anodizeinc.com/2017/04/07/clear-anodizing/
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The Aluminum Anodizers Council (AAC) has chosen Jeff Henderson to be its next president effective immediately. Henderson succeeds Rand Baldwin, who announced his retirement to AAC’s Board of Directors in the fall of 2015.

http://anodizeinc.com/2016/06/21/aac-announces-new-president/
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An anodizing layer may be dyed or undyed. In the 8625 Mil spec, the term “Class” is used to designate this: Class 1 is clear or undyed, and Class 2 is dyed.

http://anodizeinc.com/2016/05/24/common-dyed-anodizing/
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Anodizing can be performed in combination with chromate conversion coating. Each process provides corrosion resistance, with anodizing offering a significant advantage when it comes to ruggedness or physical wear resistance. The reason for combining the processes can vary, however the significant difference between anodizing and chromate conversion coating is the electrical conductivity of the films produced. Although both stable compounds, chromate conversion coating has a greatly increased electrical conductivity. Applications where this may be useful are varied, however the issue of grounding or earthing components as part of a larger system is an obvious one.

http://anodizeinc.com/2016/03/22/dual-finishing-aluminum/
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