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What is the Mathematics Of Anodizing Type II

(-----) 2007

Hello with best regards to the reader.

We are an Aluminum Extrusoin and ANODIZING company since 1985 in Peshawar, Pakistan. Products include Architectural Aluminum Profiles.

I know the general information about the anodizing process Type II.

But I want to know about any MATHEMATICAL EQUATION for ANODIZING.
For example, if I want to change the Alloy Composition, so what will be the effect on its anodizing, if the same procedure of anodizing is used for Alloy of a Different Composition.
Our used Alloy (6063) is mainly composed of Aluminum (99%), Manganese, Magnesium, Silicon, and Zinc.

Please if some one can guide me about this, that from where I can get the mathematical analysis for ALUMINUM ANODIZING TYPE II.

Muhammad Haseeb
Owner - Peshawar, NWFP, Pakistan


A lot of knowledge is empirical and, although well known and proven, not easily reduced to mathematical formula, Muhammad. There are charts available which suggest the required voltage for anodizing different alloys, but I do not know of a formula where you can plug in the composition of an alloy and its heat-treatment spec, and output the required anodizing voltage. The non-aluminum constituents of the alloy also limit etching, require desmutting, and cause the anodizing to go grey, and many data points on this are available, but again I know of nothing reduced to formula. Good question -- thanks!

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


Dear Ted Mooney, P.E.,

Thank you very much for your kind opinion.

As you pointed towards some charts in your reply to my enquiry, so will you please help me a bit to get these charts i.e. by giving me some usefull link(s) etc.

With best regards and thanks.

aluminum industries - Peshawar, NWFP, Pakistan


I can give you references rather than links, Muhammad. Robert Probert's "Aluminum How-To" has a good chart with voltage recommendations for 25 different alloys, ranging from 10.0 to 23 volts. "The Surface Treatment and finishing of Aluminum Alloys" has a graph of the voltage required for 13 different alloys, ranging from about 13.5 volts for type 7072 to 18.5 volts for type 2014. The AESF Training Course (www.nasf.org) shows five different alloys with suggested voltage ranging from 17 to 22 volts. Good luck.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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