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Why are there pitting holes on hard chrome plating?
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Why is there frequent pitting holes at the piston ring grooves and why are cracks visible on hard chrome plating?
Is there any way to stop these problems?
Mislan RafenQA Coordinator- marine industry - Singapore
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Because you're not doing it right :-)
Chrome plating is unfortunately a difficult process where a hundred different things can go wrong, and a hundred different things must be exactly right before you will get satisfactory plating, Mr. Rafen. So it is really difficult to help from this distance with a vaguely described problem and situation.
But one hard chrome plating expert once addressed a trouble-shooting forum by saying essentially this: "Step 1: go to every toolbox, locker, and junk drawer in the shop and throw out every scrap of old emery cloth and sandpaper before proceeding to step 2".
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 Ted Mooney, P.E. finishing.com Brick, New Jersey |
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I must say I like Mr. Mooney's answer :)
Mr. Mislan, The current, trivalent chrome contaminents, and sulphate ratio to the chrome, temperature. Also control the hardness ofy the part you like to hard chrome. I would also recomendend a book about trouble shooting problems.
Regards,
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Anders Sundman surface finishing engineer Sweden |