Study of Microbiologically Influenced Corrosion of LY12 Aluminum Alloy with Atomic Force Microscopy
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摘要: 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-, SO2-4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,SO2-4加速腐蚀;当超过一定质量分数后,SO2- 4会减 缓腐蚀.当SO2-4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.Abstract: Sulfate-reducing bacteria induced corrosion of aluminum alloy LY12 was investig ated by using atomic force microscopy, as a function of concentrations of Fe 2+, Cl-, SO2-4 ions of the test solution. With in creasing Fe2+ concentration, the corrosion of LY12 alloy was obviously pro moted. Similar effect was observed with the addition of Cl- into the solution. The SO2-4 ion exhibited a promoting effect on corrosion at lo wer concentration and a reduced effect at higher concentration. According to th e result with AFM, the data measured by electrochemical method can be confirmed and showed, and the effect of Fe2+, Cl-, SO2-4 ions can be demonstrated by atomic force microscopy(AFM).
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Key words:
- sulfate-reducing bacteria /
- corrosion /
- aluminium alloys /
- atomic force microscop y
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