How to remove phosphate coating from hardened cast iron.

Feb 01, 2004 2 Replies
S

Trying to detect grinder burn on the surface of a induction hardened nodular iron part. The surface, before phosphating, is fine-ground.



Is there an "easy" chemical removal method, or a light hand-polish with 400 grit sandpaper the only way to go?



The objective is to get a clean metal surface for a chemical etch to reveal any grinder burn.



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I

Any plating house can do the job chemically You can also use fine mesh abrasive blasting to clean the part. The check for burns should have been done before the phosphating process.

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