Letter 6092

Hard chrome pitting 

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We are having difficulty with excessive pitting on hard chrome. Bath is chromic acid (228 gm/litre CRO3. Plating current is 2-3 amps per square inch.

Mike Nicholls
- Blenheim, New Zealand

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Hi Mike.

A lot of thing can make nodules/pitting in chrome plating. Bad treatment, low catalyst, high trivalent chrome, too long time etching, high or low ratio, magnetic, contamination, bad material and bad machining. How is the parts hanging in the racks?

Regard

Anders S

Anders Sundman
    surface finishing engineer
Sweden

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