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通过电化学阻抗谱(EIS)和极化曲线测量,研究了pH值对热镀锌汽车板和IF钢(无间隙原子钢)基板在5%NaCl溶液中电化学腐蚀行为的影响。结果表明:在三种不同pH值的溶液中,镀锌板的腐蚀过程主要受电荷传递过程控制,而基板的腐蚀过程受氧和氢离子的扩散过程控制。虽然镀锌板的腐蚀速度比基板的腐蚀速度快,但腐蚀过程都呈现了相似的变化趋势,都是随着pH值的增大,电荷转移电阻逐渐增大,腐蚀电流密度依次减小,即腐蚀速度依次减小。
The influence of pH value on the electrochemical corrosion behavior of galvanized steel and IF steel substrates in 5% NaCl solution was investigated by electrochemical impedance spectroscopy (EIS) and polarization curve measurement. The results show that the corrosion process of galvanized sheet is mainly controlled by charge transfer process in three different pH solutions, while the corrosion process of substrate is controlled by the diffusion process of oxygen and hydrogen ions. Although the corrosion rate of galvanized sheet is faster than the corrosion rate of the substrate, the corrosion process shows a similar trend. With the increase of pH value, the charge transfer resistance gradually increases and the corrosion current density decreases in turn The corrosion rate decreases in turn.