Corrosive Resistances of Duplex Stainless Steel 2605N and Ferrite Stainless Steel Cr30

Ferrite stainless steel Cr30 and duplex stainless steel 2605N were chosen as research subjects to compare their microstructures and mechanical properties.Corrosion tests with 3.5% NaCl solution and electrolytic solution for duplex stainless steel 2605N and ferrite stainless steel Cr30 were carried out to analyze the corrosion pattern.The research results show that corrosion rate of ferrite stainless steel Cr30 is 7 times as fast as that of duplex stainless steel 2605N in the chemical immersion corrosion;the main corrosion failure form of duplex stainless steel 2605N is pitting corrosion,but pitting corrosion and crystal boundary corrosion coexist in the corrosion of ferrite stainless steel Cr30 in the electrolytic corrosion;superior corrosion resistance of 2605N benefits from the high density film(Cr2O3,NiO),while the poor corrosion resistance of Cr30 results from the crystal boundary corrosion caused by the potential difference between the carbide and the matrix,and the poor corrosion resistance of the carbides.