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Al etching operating conditions?

I am currently trying to find the optimal operating conditions for Aluminium Etching. We want to optimize the Etch rate (Our Chemical Milling process), given that we must have at least a surface roughness of 65Ra. What should be the optimal conditions (Temperature, Caustic concentrations, aluminium concentration in solution should it be constant, additives, ...)

Thanks,

Guy Desharnais
- Mtl, Qc, Can

Refer to "The Surface Treatment and Finishing of Aluminum and Its Alloys" [adv: this book on AbeBooks, Amazon & eBay] by S. Wernick, R. Pinner, P.G. Sheasby.

John Tuohy
- Ireland

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