Metal finishing Q&As since 1989
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Black coating on steel - OL20.22
We have an old sample of part made of steel with the black coating and with marking "OL 20.22" and I was told that this is some kind of Zn/Ni plating. Could sombody confirm/comment that?
Yury Zhatkin
plating specialists - Sillamae, Ida-Viru, Estonia
2004
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