Electrochemical Behaviour of AISI 410 Stainless Steel at Open Circuit Potential in Acidic Solutions

In this study, the electrochemical behaviour of aisi 410 stainless steel at opencircuit potential (ocp) in acidic solutions was investigated. for this purpose, the passivationparameters and semiconductor properties of passive films were derived frompotentiodynamic polarization, mott–schottky analysis and electrochemical impedancespectroscopy (eis). the potentiodynamic polarization curves suggested that aisi 410stainless steel showed excellent passive behaviour in hno3 solutions. also, the polarizationcurves showed that the corrosion potential and corrosion current density of aisi 410 stainlesssteel increased with the increase in the concentration of solutions. for all hno3 solutions,mott–schottky analysis showed two positive slopes in the main passive region (n-typebehaviour). also, this analysis indicated that the donor densities (nd1 and nd2) for the passivefilms formed on aisi 410 stainless steel are in the range 1021 cm-3 and increased with hno3solutions. eis results showed that the reciprocal capacitance of the passive film is directlyproportional to its thickness which increases with decreasing hno3 concentration. it is thusclear that dilute hno3 solutions offer better conditions for forming passive films with higherprotection behaviour, due to the growth of a much thicker and less defective films