Passivation is a non-electrolytic process which removes iron, iron oxides and other impurities from the surface, rendering stainless steel more rust-proof.

Electropolishing is an electrolytic process which dissolves small surface asperities. What remains is an ultra-smooth, ultra-clean surface. Friction is reduced and materials are further prevented from sticking. Electropolishing is a very effective method of passivation ,exceeding that of nitric acid passivation, so that if a part is electropolished it needs no supplemental passivation. Visually, electropolishing produces a bright, polished, highly reflective surface finish while passivating produces a matt, grey uniform finish.

Last updated on September 23, 2009 by Chilco