高锰钢海水腐蚀电化学行为研究

Study on Electrochemical Behavior of High Manganese Steel Corrosion in Seawater

为探究高锰钢在不同海洋环境下的腐蚀规律,利用Autolab电化学工作站,在不同质量分数Cl^(-)、HSO_(3)^(-)及不同pH值介质腐蚀液中对高锰钢试样进行腐蚀实验,研究试样在3种腐蚀液中的开路电位、电化学极化和电化学阻抗行为。结果表明:在不同质量分数的Cl^(-)溶液中,高锰钢的腐蚀速度随Cl^(-)质量分数的增加出现先增大后减小的趋势,且在7.0%NaCl溶液中腐蚀速率达到极大值,即耐腐蚀性最差;在不同质量分数的NaHSO_(3)+3.5%NaCl溶液中,腐蚀速率随NaHSO_(3)质量分数的增加而增加;在不同pH值的3.5%NaCl溶液中,高锰钢在pH值为7.0的中性3.5%NaCl溶液中腐蚀速率最大,而在pH值为5.5和8.5的3.5%NaCl溶液中腐蚀速率次之。

In order to learn the corrosion law of high manganese steel in different marine environments,corrosion tests are performed on high manganese steel samples in the corrosion solutions such as Cl^(-),HSO_(3)^(-) with different concentrations and medium with different pH values by Autolab,the open circuit potential,electrochemical polarization and electrochemical impedance behavior of the samples in three corrosion solutions are investigated.The results show that the corrosion rate of the high manganese steel has the tendency of increase first and decrease then with increasing mass fraction of Cl^(-)in Cl^(-) solutions of different mass fractions,the corrosion rate reaches the maximum value in 7.0% NaCl solution with the poorest corrosion resistance.In 3.5% NaCl solution with different mass fraction of NaHSO_(3),the corrosion rate increases with the increase of NaHSO_(3) mass fraction.In 3.5% NaCl solutions with different pH values,the corrosion rate of high manganese steel is the highest in neutral 3.5% NaCl solution with pH value of 7.0,followed by 3.5% NaCl solution with pH values of 5.5 and 8.5.