【摘 要】
：
采用动极化曲线、电化学交流阻抗谱(EIS)等电化学测试技术和化学浸泡法研究海水中硫酸盐还原菌(SRB)对09-Cr2AlMoRE钢的腐蚀行为.结果表明,SRB新陈代谢产物S2-与腐蚀产物Fe2+
【机 构】
：
大连海事大学交通与物流工程学院,大连理工大学化工学院,
论文部分内容阅读
采用动极化曲线、电化学交流阻抗谱(EIS)等电化学测试技术和化学浸泡法研究海水中硫酸盐还原菌(SRB)对09-Cr2AlMoRE钢的腐蚀行为.结果表明,SRB新陈代谢产物S2-与腐蚀产物Fe2+反应生成硫化铁,促进了09Cr2AlMoRE钢的阳极活性溶解.09Cr2AlMoRE钢的腐蚀产物呈絮状,颗粒粗大、疏松,分布不连续;杆状硫酸盐还原菌在钢表面局部富集、附着,细菌通过细胞外高聚物被腐蚀产物所包裹.09-Cr2AlMoRE钢在接菌海水中的腐蚀产物由FeS构成,其中硫元素含量高达8.29%.膜沉积处的FeS与附近的09-Cr2AlMoRE钢表面组成腐蚀电偶电池,而SRB的作用在于不断提供H2S以维持FeS的电化学活性,从而加速腐蚀.
The corrosion behavior of 09-Cr2AlMoRE steel in saltwater was studied by electrochemical polarization (EIS) and electrochemical impedance spectroscopy (EIS) and chemical immersion method.The results showed that SRB metabolites S2- With the corrosion product of Fe2 + to form iron sulfide, which promoted the active dissolution of 09Cr2AlMoRE steel. The corrosion products of 09Cr2AlMoRE steel were flocculent, coarse, loose and distributed discontinuously; rod-shaped sulfate-reducing bacteria were localized on the steel surface, , Bacteria were encapsulated by the extracellular polymer by the corrosion products.The corrosion products of 09-Cr2AlMoRE steel in the inoculating seawater consisted of FeS with the content of sulfur as high as 8.29% .The FeS in the film deposition and the nearby 09-Cr2AlMoRE steel The surface composition of the corrosion of galvanic cells, and the role of SRB is to continue to provide H2S to maintain the electrochemical activity of FeS, thereby accelerating corrosion.
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