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Common anodize defects


We are creating a cosmetic standard for anodized aluminum parts that go on our product. I am looking for a list of common defects that can occur with this process for inclusion in our standard.

Floyd Goshorn
- East Troy, Wisconsin


You need to purchase Arthur Brace's Anodic Coating Defects. Visit the bookstore or contact one of the plating journal publishers that publish "Products Finishing" [link is to product info at Amazon] or Metal Finishing. The list is long and is very specific to the alloy you're using and the specific anodize process used (chromic vs. sulfuric vs. hardcoat).

Good luck ( anodically speaking! ).

Milt Stevenson, Jr.
Syracuse, New York

 Ed. note July '07: no longer has this book. Anodic Coating Defects is available direct from the world distributor at

September 6, 2013 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Dear sir,

What are all the Types of Anodizing Defects, and How to solve or Rectify the Anodizing Defects. Examples:
1) White Rust,
2) White patch on Particular Area of the Component,
3) Dull Colour noticed on the component.

P.Thulasi Raman
- Chennai,Tamil Nadu, India
  ^- Privately contact this inquirer -^

September 6, 2013

A. Hi Raman. If you can start with one of these 3 problems and supply us with specifics -- including alloy, processing sequence, photo of defect, frequency of the problem, etc., then I think we can work back and forth until we help you address the problem. But for a treatment of the general topic of anodizing defects, please see if your library has a copy of the referenced Arthur Brace book, or buy a copy from That book is 168 pages and is probably the minimum length for a general discussion of anodizing defects. Good luck!


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Ted Mooney, P.E. RET
Pine Beach, New Jersey

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