Electrochemical Behavior of Mg-Mn Alloy in NaCl Solutions with Different Concentrations

Abstract

This study investigated the impact of NaCl concentration on the electrochemical performance of one kind of commercial Mg-Mn alloy （M1C）. Firstly, potentiodynamic polarization （PDP） tests were conducted to determine corrosion behavior of M1C in NaCl solutions with concentrations of 0.1 mass％, 0.5 mass％, 3.5 mass％, and 10.0 mass％. Additionally, electrochemical impedance spectroscopy （EIS） tests were performed to analyze the oxide film thickness across varying solution concentrations. The PDP results indicated that the corrosion rate of M1C increased with the increase of solution concentration. Furthermore, breakdown potential was observed in anodic polarization curves when the concentration of NaCl solution was over 0.5 mass ％. The EIS results showed that after 24h immersion, thickness of MgO film decreased with increasing NaCl concentration and then stabilized.