The Need for Surface Treatment of a Metal
by Dr E. Ramanathan A metal surface should be free from crevice, pitting, galvanic and creeping corrosions, scales, tool marks, oil, grease and dirt in any form prior to chemical conversion coating. There are different types of corrosion viz., crevice, pitting, galvanic and cosmetic corrosions. Crevice corrosion is caused by stagnant electrolyte trapped in silent…
