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Hard Anodize - temperature - Pore density question



May 21, 2010

Can anyone give me an idea as to the different pore densities that would be produced by a hard anodize process - where the only difference was temperature? The bath concentration levels are the same for each of the three temperatures. the amps/ft2 are all run the same (say 35 amps/ft2). What would be the pore density difference between a bath that was 45 degrees, a bath that was 35 degrees and a bath that was 30 degrees? My understanding is that temperature obviously keeps the part cool from all the current running thru it - but does it not also have an influence on the shape and size of the pore?

Wedge McFrody
product designer / ex anodize job shopper - Houston, Texas, USA



May 26, 2010

Quantitative data has not been published because the answer is in multiple variables. The general rules are: the warmer the solution then the larger the pores (less Taber Abrasion), the higher the free acid then the larger the pores, the LOWER the current density then the larger the pores. Glycolic/glycerin additives make the pore smaller.
old fashion oxalic acid makes the pore smaller. That is four dimensions right there and we have not added in dissolved aluminum, alloy, etc.so no hard numbers.

robert probert
Robert H Probert
Robert H Probert Technical Services
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Garner, North Carolina
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