Author/Authors :
Fattah-alhosseini، Arash نويسنده Faculty of Engineering, Bu-Ali Sina University, Hamedan 65178-38695, Iran Fattah-alhosseini, Arash , Moradi، Amir Moradi نويسنده Department of Orthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran , , Moradi، Elmira نويسنده Faculty of Engineering, Bu-Ali Sina University, Hamedan 65178-38695, Iran Moradi, , Attarzadeh، Navid نويسنده Department of Chemical Engineering, New Mexico State University, Las Cruces, NM 88001, USA Attarzadeh, Navid
Abstract :
In this study, the electrochemical behaviour of AISI 410 stainless steel at open
circuit potential (OCP) in acidic solutions was investigated. For this purpose, the passivation
parameters and semiconductor properties of passive films were derived from
potentiodynamic polarization, Mott–Schottky analysis and electrochemical impedance
spectroscopy (EIS). The potentiodynamic polarization curves suggested that AISI 410
stainless steel showed excellent passive behaviour in HNO3 solutions. Also, the polarization
curves showed that the corrosion potential and corrosion current density of AISI 410 stainless
steel 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-type
behaviour). Also, this analysis indicated that the donor densities (ND1 and ND2) for the passive
films formed on AISI 410 stainless steel are in the range 1021 cm-3 and increased with HNO3
solutions. EIS results showed that the reciprocal capacitance of the passive film is directly
proportional to its thickness which increases with decreasing HNO3 concentration. It is thus
clear that dilute HNO3 solutions offer better conditions for forming passive films with higher
protection behaviour, due to the growth of a much thicker and less defective films
