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首页> 外文会议>NACE annual conference exposition >A Study of Microbiologically Induced Corrosion by SRB on Carbon Steelusing Hydrogen Permeation
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A Study of Microbiologically Induced Corrosion by SRB on Carbon Steelusing Hydrogen Permeation

机译：SRB对碳钢氢渗透微生物诱导腐蚀的研究。

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This is a study of how Sulfate–Reducing Bacteria (SRB) intervene in the process ofrnMicrobiologically Induced Corrosion (MIC) of carbon steel. Specifically, the evaluation was centeredrnon the part played by Desulfovibrio desulfuricans subs. Desulfuricans in altering the kinetics of therncathodic reaction of hydrogen evolution using the hydrogen permeation cell developed by Devanathanrnand Starchuski. An evaluation of planktonic population growth was performed during the tests in therninoculated medium. In all cases, a typical growth curve was obtained, with counts ranging between 107rnand 109 cell/Ml at 24 hours. Sessile count was made by ultrasonic removal from the strip and biofilmrncharacterization by Scanning Electron Microscopy (SEM). Bacteria with vibrio morphology werernobserved at a concentration of 107 cell/Ml. The test determined hydrogen permeation 200 minutes afterrninoculation and an open–circuit potential reduction of the steel at values of –780 Mv vs SCE, with highrnbacterial activity and the typical H2S attack morphology. These results, together with those obtained onrna palladium strip, show that this SRB corrodes carbon steel through direct corrosive action of the H2Srngenerated by the bacteria during their metabolic process of reducing sulfates to sulfides, accelerated byrnthe formation of a non – protective iron sulfide film. Therefore, the Cathodic depolarization theory is notrnthe chief action mechanism of D. desulfuricans in the MIC process.
机译：这是关于硫酸盐还原细菌（SRB）如何干预碳钢的微生物诱发腐蚀（MIC）过程的研究。具体而言，评估集中在Desulfovibrio desulfuricans subs扮演的角色。使用由Devanathanrn和Starchuski开发的氢气渗透池，脱硫尿素改变氢气析出的阴极反应动力学。在接种疫苗的试验过程中，对浮游种群的生长进行了评估。在所有情况下，均获得了一条典型的生长曲线，在24小时内的计数范围为107rn至109细胞/ Ml。通过从条上超声去除并通过扫描电子显微镜（SEM）表征生物膜来进行无数计数。以107个细胞/ ml的浓度观察到具有弧菌形态的细菌。该测试确定了接种200分钟后氢的渗透以及钢的开路电势降低为–780 Mv vs SCE，具有较高的细菌活性和典型的H2S侵蚀形态。这些结果以及在钯钯带上获得的结果表明，该SRB在细菌将硫酸盐还原为硫化物的代谢过程中，通过细菌生成的H2Srn的直接腐蚀作用腐蚀了碳钢，并通过形成非保护性硫化铁膜而加速了碳钢的腐蚀。因此，阴极去极化理论并不是去硫链霉菌在MIC过程中的主要作用机理。

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