How is the corrosion resistance of a Duplex stainless steel affected by electropolishing?
Can electropolishing improve the corrosion protection of a Duplex steel surface?
Studies show that the chrome/iron ratio of Duplex 2205 SS is improved after electropolishing. Two different studies also show that electropolishing with subsequent passivation provides the best protection against point corrosion.
Furthermore, it has been found when looking into low alloy Duplex that in mechanical grinding or / and mechanical polishing, the Austenitic phase on the steel surface may be converted into Martensite. The same studies also show that this does not occur when the surface is electropolished.
Feel free to read Calamo’s Report on Corrosion Properties of Electropolished Stainless Steel, which you can find here.
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