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Oxalic vs sulfuric Anodizing of Aluminum

Aluminum How-To
"Chromating - Anodizing - Hardcoating"
by Robert Probert

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"The Surface Treatment & Finishing of Aluminium and Its Alloys"
by Wernick, Pinner & Sheasby

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I need to know if there is a difference between Oxalic and Sulfuric anodization. I know that the colour will differ and I think there is an issue with pore sizes, but will this affect their function as a wear resistant hard coating where there are no temperature or pH considerations?

John Hayes
medical equipment supplier - Dublin City, County Dublin, Ireland
2003

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