TY - JOUR
T1 - Electrochemical corrosion study of Sn-XAg-0.5Cu alloys in 3.5% NaCl solution
AU - Mohanty, Udit Surya
AU - Lin, Kwang Lung
PY - 2007/9
Y1 - 2007/9
N2 - The electrochemical corrosion behavior of Sn-XAg-0.5Cu alloys in 3.5% NaCl solution was examined using potentiodynamic polarization techniques. The Ag content in the alloy was varied from 1 to 4 wt%. The polarization curves obtained for the alloys show an active-passive transition followed by a transpassive region. Sn-XAg-0.5Cu alloys with higher Ag content (>2 wt%) show a strong tendency toward passivation. The passivation behavior has been ascribed to the presence of both SnO and SnO2 on the anode surface. Increase in Ag content from 1 to 4 wt% results in a decrease in the corrosion-current density (Icorr) and linear polarization resistance (LPR) of the alloy. Nevertheless, the corrosion potential (Ecorr) shifts toward negative values, and a decrease in corrosion rate is observed. The presence of Cl- ion initiates pitting and is responsible for the rupture of the passive layer at a certain breakdown potential. The breakdown potential, (EBR) decreases and shifts toward more noble values with increase in Ag content in the alloy. Surface analyses by x-ray photoelectron spectroscopy (XPS) and Auger depth profile studies confirmed the formation of both Sn(II) and Sn(IV) oxides in the passive layer.
AB - The electrochemical corrosion behavior of Sn-XAg-0.5Cu alloys in 3.5% NaCl solution was examined using potentiodynamic polarization techniques. The Ag content in the alloy was varied from 1 to 4 wt%. The polarization curves obtained for the alloys show an active-passive transition followed by a transpassive region. Sn-XAg-0.5Cu alloys with higher Ag content (>2 wt%) show a strong tendency toward passivation. The passivation behavior has been ascribed to the presence of both SnO and SnO2 on the anode surface. Increase in Ag content from 1 to 4 wt% results in a decrease in the corrosion-current density (Icorr) and linear polarization resistance (LPR) of the alloy. Nevertheless, the corrosion potential (Ecorr) shifts toward negative values, and a decrease in corrosion rate is observed. The presence of Cl- ion initiates pitting and is responsible for the rupture of the passive layer at a certain breakdown potential. The breakdown potential, (EBR) decreases and shifts toward more noble values with increase in Ag content in the alloy. Surface analyses by x-ray photoelectron spectroscopy (XPS) and Auger depth profile studies confirmed the formation of both Sn(II) and Sn(IV) oxides in the passive layer.
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U2 - 10.1557/jmr.2007.0328
DO - 10.1557/jmr.2007.0328
M3 - Article
AN - SCOPUS:34748903503
VL - 22
SP - 2573
EP - 2581
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 9
ER -