Corrosion resistance of 316L stainless steel cladded on plain carbon steel by powder metallurgy

Abstract

A sandwich structure with 316L stainless steel cladding on plain carbon steel was prepared by means of powder metallurgy processing. The corrosion performances of the cladding samples were studied by long term immersion tests and potentiodynamic anodic polarisation tests in sulphuric acid and ferric chloride solutions. The 316L surface layer, ≥1·0 mm deep produced by PM cladding improves corrosion resistance in H₂SO₄ and FeCl₃ solutions, although it is slightly lower than that of PM 316L bulk material. The PM 316L cladding surface layers have a similar anodic polarisation behaviour to the PM 316L bulk material in H₂SO₄ and FeCl₃ solutions, but the anodic current density of the PM bulk sample is much smaller than that of the cladding samples.