A3钢在芽孢杆菌作用下的腐蚀行为

采用表面分析技术、失重法和电化学测试技术研究了A3钢在芽孢杆菌(Bacillus)作用下的腐蚀行为.扫描电子显微镜(SEM)分析结果表明,浸泡7d时,芽孢杆菌会在A3钢表面形成致密的生物膜,有效阻隔了溶液对基体的腐蚀,抑制了腐蚀过程.电化学交流阻抗测试结果显示,含菌体系中的试样表面经历了2个时间常数→3个时间常数→2个时间常数的变化过程.失重法和极化曲线测试结果表明,芽孢杆菌的细菌活性对生物膜的保护作用有着决定性的影响,当微生物活性下降,生物膜的保护能力也会大幅降低.

Corrosion Behavior of Steel A3 Influenced by Bacillus

Surface analysis, mass loss and electrochemical mesurements were used to investigate the corrosion behavior of steel A3 under the effect of Bacillus. Scanning electron microscopy (SEM) indicated that the presence of Bacillus resulted in a compact biofilm after 7 days of exposure, which effectively protected the coupon from being corroded by the solution. Electrochemical impedance spectroscopy (EIS) showed that the number of time constants changed from 2 to 3 and returned to 2 in the Bacillus system. The mass loss and polarization curve results showed that the activity of the bacteria determined the effectiveness of the biofilm. The protective ability of the biofilm decreased when the activity of the bacteria decreased.