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

机译：氢渗透碳钢对微生物学诱导腐蚀的研究

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This is a study of how Sulfate-Reducing Bacteria (SRB) intervene in the process of Microbiologically Induced Corrosion (MIC) of carbon steel. Specifically, the evaluation was centered on the part played by Desulfovibrio desulfuricans subs. desulfuricans in altering the kinetics of the cathodic reaction of hydrogen evolution using the hydrogen permeation cell developed by Devanathan and Starchuski. An evaluation of planktonic population growth was performed during the tests in the inoculated medium. In all cases, a typical growth curve was obtained, with counts ranging between 10~7 and 10~9 cell/mL at 24 hours. Sessile count was made by ultrasonic removal from the strip and biofilm characterization by Scanning Electron Microscopy (SEM). Bacteria with vibrio morphology were observed at a concentration of 10~7 cell/mL. The test determined hydrogen permeation 200 minutes after inoculation and an open-circuit potential reduction of the steel at values of -780 mV vs SCE, with high bacterial activity and the typical H_2S attack morphology. These results, together with those obtained on a palladium strip, show that this SRB corrodes carbon steel through direct corrosive action of the H_2S generated by the bacteria during their metabolic process of reducing sulfates to sulfides, accelerated by the formation of a non - protective iron sulfide film. Therefore, the Cathodic depolarization theory is not the chief action mechanism of D. desulfuricans in the MIC process.
机译：这是对碳钢微生物诱导腐蚀（MIC）过程中硫酸盐减少细菌（SRB）干预的研究。具体而言，评估以脱硫脱硫潜水员潜水员所扮演的部分为中心。使用Devanathan和Starchuski产生的氢渗透细胞改变氢气进化的阴极反应的动力学。在接种介质的试验期间进行浮游人口生长的评估。在所有情况下，获得了典型的生长曲线，计数在24小时时在10〜7和10〜9个细胞/ mL之间。通过扫描电子显微镜（SEM）通过超声波和生物膜表征通过超声波和生物膜表征进行术。观察到具有弧形形态的细菌以10〜7个细胞/ ml的浓度观察。在接种后，测试确定氢渗透200分钟，并以高细菌活性和典型的H_2S攻击形态，以-780mV Vs的值，钢的开路电位降低。这些结果与在钯条上获得的结果一起表明该SRB通过在将硫酸盐降低至硫化物的代谢过程中通过细菌产生的H_2S的直接腐蚀作用来改变碳钢，通过形成非保护铁来加速硫化物薄膜。因此，阴极去极化理论不是D.脱硫在麦克风过程中的主要动作机制。

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