A Comparative Study of the Effects of Sulfate Reducing Bacteria on Corrosion of Carbon Steel Q235 under Simulated Disbonded Coating with Different Width of Aperture
A Comparative Study of the Effects of Sulfate Reducing Bacteria on Corrosion of Carbon Steel Q235 under Simulated Disbonded Coating with Different Width of Aperture
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DOI：
10.4028/www.scientific.net/amr.503-504.247
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
P. Zhao;J. Yang;P. Zhu;Cheng Sun;Jin Xu
中科院分区：
文献类型：
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作者：
P. Zhao;J. Yang;P. Zhu;Cheng Sun;Jin Xu
采用电化学方法研究了硫酸盐还原菌（SRB）对Q235钢在土壤浸提液（SES）中模拟开孔宽度为1.0和0.5mm的脱粘涂层缝隙中腐蚀的影响。结果表明，硫酸盐还原菌的存在会导致工作电极的腐蚀电位向更负的方向移动，并在电极表面形成点蚀。与缝隙宽度为1.0mm时相比，缝隙宽度为0.5mm时电极的腐蚀电位稍偏正。在无SRB的SES中，电极的腐蚀速率随孔径宽度的增大而增大，而在有SRB的SES中，电极的腐蚀速率随孔径宽度的增大而减小。结果表明，硫酸盐还原菌在电极表面形成的生物膜和电极孔径对碳钢的缝隙腐蚀过程有明显的影响。
The effect of sulfate reducing bacteria (SRB) on the corrosion of Q235 steel has been investigated in the crevice under the simulated disbonded coating with aperture width of 1.0 and 0.5mm in the soil-extract solutions (SES) by using electrochemical methods. The results show that the existence of SRB in SES can cause corrosion potential of the working electrode to shift to a more negative value, and the formation of pitting on the surface of the electrode. Compared with the crevice width of 1.0mm, the corrosion potential of the electrode shows a little more positive at the crevice width of 0.5mm. The corrosion rate of the electrode increases with the increase of aperture width in the SES without SRB, however, decreases with the increase of aperture width in the SES with SRB. The results obtained indicate that either bio-film on the surface of the electrode formed by SRB in SES or aperture width has obvious influences on the crevice corrosion process of the carbon steel.