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Metal finishing Q&As since 1989
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Discoloration on stainless steel edges
I'm cutting stainless steel (medical grade material) using EDM process, and I'm getting discoloration on the edges, what can I use besides Phosphoric acid to clear them up?
Waldin Gonzalez- Tustin, California
2002
Sometimes this is difficult to remove, but we have had customers successfully remove it with our citric acid based products using warm (150-160 °F) solutions, many times with ultrasonics. One customer uses our product at 180F for this type of cleaning. You can only try it to see if it works for your particular situation.
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Lee Kremer
Stellar Solutions, Inc.
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McHenry, Illinois
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2002
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