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利用交流阻抗测试技术、扫描电镜及表面能谱、失重法、微生物分析等方法 ,研究了在不同Cl-含量的土壤中 ,硫酸盐还原菌对 1Cr18Ni9Ti不锈钢腐蚀的影响规律 .13 6d的试验结果表明 ,不同Cl-含量土壤中SRB菌量在2 3 0 0 0～ 3 5 0 0 0 (个 /克土 )之间 ,Cl-的加入并没有显著影响SRB的生长 ,随着Cl-的加入土壤中SRB的菌量有增大的趋势 ;随着土壤中Cl-含量的增大 ,不锈钢腐蚀电位负偏移 ,而且在接菌土壤中的腐蚀电位比在灭菌土壤中负移幅度更大 ;不锈钢在灭菌土壤中没有发生点蚀现象 ,而在接菌土壤中发生了严重的点蚀 ,最大点蚀深度随着土壤中Cl-含量的增加而增大 ,这说明在土壤中SRB及Cl-的共同作用下 ,增大了不锈钢的点蚀敏感性 .不锈钢在灭菌土壤中的阻抗图谱表现为一个半径很大的容抗弧 ,而在接菌土壤中的阻抗图表现为两个时间常数的双容抗弧
The effects of sulfate-reducing bacteria on the corrosion of 1Cr18Ni9Ti stainless steel in different Cl-contents soils were studied by means of AC impedance testing, scanning electron microscopy and surface energy spectra, weight loss and microbial analysis, etc. The results of 136 days , The amount of SRB in soil with different Cl-content was between 2300 ~ 350000 (grains per gram of soil), and the addition of Cl- did not significantly affect the growth of SRB. With the addition of Cl- The bacteria in SRB tended to increase. With the increase of Cl-content in soil, the corrosion potential of stainless steel was negatively deviated, and the corrosion potential in bacteria-in-soil was more negative than that in sterilized soil. No pitting occurred in the sterilized soil, but severe pitting corrosion occurred in the inoculated soil. The maximum pitting depth increased with the increase of Cl- content in the soil, indicating that SRB and Cl - together, the pitting sensitivity of stainless steel is increased.The impedance spectrum of stainless steel in sterilized soil shows a large capacitive arc of resistance, and the impedance diagram in the inoculated soil shows two times Double capacitance arc constant