Electropolishing of stainless steel is the most common use of the process. Although nearly any metal will work, the most commonly electropolished metals are 300- and 400-series stainless steel. Parts made from 400-series stainless steel  have the advantage of increased hardness and strength but the trade-off is increased susceptibility to corrosion. By electropolishing stainless steel, engineers can use 400-series SS and still provide protection from corrosion.  

Electropolishing is an electrochemical finishing process that removes a thin layer of material from a metal part, typically stainless steel or similar alloys. The process leaves a shiny, smooth, ultra-clean surface finish.

ElectroPolish

ElectroPolish

ElectroPolish