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Cleaning Issues with electrogalvanized steel

Organic coated job (0.8 mm CRS Electrogalvanized Zinc coated sheet) not proper oil removed by degreasing stage, Suppose Use for Alkaline chemicals e.g Ridolene 53S Caustic base 0.2 % & Ridosol 550B By Henkel.
Problems.
Brown Ring on Pressing Portion.
Etching On Bending Portion.
Oil Patches.

Javed Sayyad
plating shop employees - Pune
November 29, 2009

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