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Cleaning corroded aluminium sandcastings and zinc diecastings
Can anyone suggest the best way of cleaning corroded aluminium castings? These are automotive, (gearbox tops, bellhousings etc) The original finish was satin, ripple finish and bright. The condition now is usually(white and grey) corrosion in parts. I am reluctant to use abrasive methods which will alter the original surface texture. I also want to find a method of cleaing very dark grey oxidation from Mazak zinc diecastings (carburetor bodies).Chromic acid has been suggested - any comments?
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