原子力显微镜下LY12铝合金的微生物腐蚀行为

采用原子力显微镜对硫酸盐还原细菌引起的LY12铝合金腐蚀进行了研究.分别研究了不同质 量分数 的Fe²⁺, Cl^-, SO^2-₄离子对硫酸盐还原细菌(SRB)引起的LY12铝合金腐 蚀 的影响.Fe²⁺质量分数的增加会使腐蚀程度增加.随着Cl^-质量分数的增加,局部腐 蚀也会严 重.在一定质量分数范围内,SO^2-₄加速腐蚀;当超过一定质量分数后,SO^2- ₄会减 缓腐蚀.当SO^2-₄离子质量分数从0.80%增加到1.50%时,溶液腐蚀性有所降低.通过 原子力显微镜的研究,可以直观的说明电化学研究的结果和各影响因素的作用.

Study of Microbiologically Influenced Corrosion of LY12 Aluminum Alloy with Atomic Force Microscopy

Sulfate-reducing bacteria induced corrosion of aluminum alloy LY12 was investigated by using atomic force microscopy, as a function of concentrations of Fe 2+ , Cl -, SO 2- 4 ions of the test solution. With increasing Fe 2+ concentration, the corrosion of LY12 alloy was obviously promoted. Similar effect was observed with the addition of Cl - into the solution. The SO 2- 4 ion exhibited a promoting effect on corrosion at lower concentration and a reduced effect at higher concentration. According to the result with AFM, the data measured by electrochemical method can be confirmed and showed, and the effect of Fe 2+ , Cl -, SO 2- 4 ions can be demonstrated by atomic force microscopy(AFM).