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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" 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

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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