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White spots and black crusts in Electropolishing

Sometimes doing electropolish on SS 304 powder metallurgy part, I see some white spots; they are whiter than the area surrounding them, my question is where they come from.

Also I see some black crust on the part surface difficult to remove, which is the best method to remove it?

Daniel Hernandez
Plating shop - Bucaramanga Santander Colombia
October 19, 2011

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