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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing 1989-2024
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SS420 Pickling and Passivation Problem
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Q. Hello, I have 420 stainless steel drive rollers, which I subject to heat treatment. These return to the process buckled so they must be straightened with heat where they burn and black spots remain. Afterwards we have to brush them mechanically to return their natural color. My question is if there is any chemical solution that allows me to avoid brushing. I tried HNO3 and HF and they blackened even more and the burnt stain did not disappear. I thank you in advance for your advice. Sincerely Juan
Juan Moreno- Santiago de Chile
October 24, 2023
A. Hi Juan,
adv.
Please contact me directly. We tested a few possible chemical solutions for heat treated 420 ss.
Anna Berkovich
Russamer Lab
Pittsburgh, Pennsylvania
October 25, 2023
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