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Difference Between Type I and Type II anodize

Quickstart:
     Readers wanting a quick intro to anodizing of aluminum may wish to view our "Intro to Aluminum Anodizing (Anodic Oxidation of Aluminium)".




Q. I would like a detailed explanation of the difference in the end product when using Type I or Type II anodize on Aluminum plate. Any Help?

John Hart
1998

probertEthumb
Aluminum How-To
"Chromating - Anodizing - Hardcoating"

by Robert Probert

Also available in Spanish

You'll love this book. Finishing.com has sold almost a thousand copies without a single return request :-)


A. Type I, (chromic acid) is used for parts:

Type II, (sulfuric acid) is used for parts:

Also see MIL-A-8625 / MIL-PRF-8625 [⇦ this spec on DLA].

tom & pooky   toms signature
Tom Pullizzi
Falls Township, Pennsylvania




Q. What base is anodizing dye. Is it oil or water and can I buy it in small amounts? What is the price?

Billy Doyle
- Grand Prairie Texas us
2000


A. It is water based, Billy. You may be able to buy RIT dye ⇦ on eBay or Rit Dye [affil link] in small amounts for a few dollars if your needs are non-rigorous, but purpose-designed dyes for anodizing are probably a bit more more expensive. Please see "Seeking Anodizing Dye" for sources.

Good luck.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha

finishing.com - Pine Beach, New Jersey

Ted is available for instant help
or longer-term assistance.





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