The passivation and the resistance to pitting corrosion of a 21%Cr-7%Ni-2%Mo-2%Mn-1%Cu duplex stainless steel in neutral and alkaline buffered solutions, with and without chloride ions, was studied using electrochemical techniques. Results are explained through changes in the structure and composition of the passive layer during the anodization process. The presence of sodium chloride (NaCl) enhanced metal electrodissolution through the passive layer, this effect being more pronounced at either lower pH values or higher chloride concentrations.
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Souto et al. (2001) studied this question.
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