假单胞菌对A3钢在枝孢霉菌溶液中腐蚀行为的影响

采用动电位扫描法、电化学交流阻抗法和表面分析方法研究了假单胞菌的加入对A3钢在枝孢霉菌溶液中腐蚀行为的影响. 结果表明, 假单胞菌的存在影响了A3钢在枝孢霉菌体系中阳极的反应过程, 假单胞菌与枝孢霉菌混合体系(简称假-枝混合菌体系)中A3钢的自腐蚀电流小于枝孢霉菌单种菌体系, A3钢的腐蚀速率减小；随着浸泡时间的延长, 从第7天开始, A3钢电极在假-枝混合菌体系中的阻抗值较之同样浸泡天数的枝孢霉菌单种菌体系的阻抗值大, 假单胞菌的存在抑制了枝孢霉菌对A3钢的腐蚀. SEM结果表明, A3钢在枝孢霉菌和假-枝混合菌体系中均发生了点蚀,枝孢霉菌单菌体系中A3 钢的点蚀坑大而深, 假-枝混合菌体系中的点蚀坑与枝孢霉菌体系相比小而浅.

Influence of Pseudomonas on the Corrosion Behaviors of Steel A3 in Cladosporium Solution

The potentiodynamic scanning polarization,electrochemical impedance spectroscopy and surface analysis methods were employed to investigate the effect of pseudomonas on the corrosion behaviors of stee1 A3 in cladosporium solution.It was showed that the existence of pseudomonas affected the anodic process of steel A3 in cladosporium solution,free corrosion current(icorr)of steel A3 decreased when the two microorganisms coexisted in the culture.With exposure time increasing,from the 7th day,the impedance value of steel A3 in the mixed-colony system was greater than that in the cladosporium system,which indicated that pseudomonas had an inhibitory effect on the corrosion of steel A3.The results of SEM indicated that pitting corrosion occurred in both of the cladosporium and the pseudomonas-cladosporium mixed colony systems,but the pitting holes of steel A3 in the latter solution were smaller and shallower.