2A12铝合金电化学腐蚀行为研究

Electrochemical Corrosion Behavior of 2A12 Aluminum Alloy

采取正交试验方法,利用极化曲线和电化学阻抗谱(EIS)等电化学方法研究了2A12铝合金在不同溶液浓度、pH值以及温度的NaCl溶液中的腐蚀行为。试验结果表明,溶液浓度、pH值以及温度对2A12铝合金在NaCl溶液中耐腐蚀行为的影响依次为:pH值、温度、溶液浓度。2A12铝合金的耐腐蚀性能随着NaCl溶液浓度的增加而变差;NaCl溶液温度越高,腐蚀电流密度Icorr越大,合金耐腐蚀性能下降;溶液中性条件下,合金耐腐蚀性能最强,碱性条件下耐腐蚀性能最差;酸性条件下腐蚀电流密度Icorr随pH值的降低而增大,合金耐腐蚀性能减弱。

A research has been conducted on the electrochemical behavior of 2A12 aluminum alloy in NaCl solutions with different concentration,pH value and temperature by adopting electrochemical impedance spectroscopy(EIS)and electrochemical impedance spectroscopy(EIS).The results show that the influence of solution concentration,pH value and temperature on corrosion resistance of 2A12 aluminum alloy in NaCl solutions follows the following order:pH value,temperature,concentration.The corrosion resistance of 2A12 aluminum alloy deteriorates with the increase of NaCl concentration.The corrosion resistance of 2A12 aluminum alloy decreases with the increase of NaCl solution concentration;the higher the NaCl solution temperature is,the higher the corrosion current density Icorr will be,with the corrosion resistance of 2A12 aluminum alloy decreasing as well.The corrosion resistance of the alloy is the strongest under the neutral solution condition,while the worst under the alkaline condition.The corrosion current density Icorr increases with the decrease of pH value under the acid condition,with the corrosion resistance of the alloy decreasing simultaneously.