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Study of the electrochemical behaviour of 304 stainless steel in postgate medium in the presence and absence of desulfovibrio desulfuricans

机译:在存在和不存在脱硫弧菌脱硫尿酸的条件下,在后门介质中304不锈钢的电化学行为的研究

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摘要

A comparative study has been undertaken on the behaviour of AISI 304 steel in Postgate medium with and without the presence of Desulfovibrio desulfuricans subspecies desulfuricans bacteria (strain DSM 642). Electrochemical studies were carried out with open circuit potential measurements, linear polarization, electrochemical impedance spectroscopy (EIS) and scanning electronic microscopy (SEM). In Postgate medium without bacteria, and as expected in stainless steels, the formation is observed of a protective surface passive film on the AISI 304 steel. On measuring the corrosion potentials (E{sub}(corr)), it is noted that the potential tends to rise with the immersion time, and in the impedance graphs an increase is observed in the charge transfer resistance and a higher phase angle with respect to the other systems tested. However, in Postgate medium with Desulfovibrio desulfuricans (strain DSM 642), the tendency of the corrosion potentials (E{sub}(corr)) is not uniform, though the recorded values are less noble than those for the medium without bacteria. A variation is observed in the properties of the layer of corrosion products in the presence of bacteria as the immersion time advances (due to the effects caused by the formation of corrosion products which gives rise to changes in the corrosion speed).
机译:已经对AISI 304钢在带有或不带有Desulfovibrio desulfuricans亚种的desulfuricans细菌(DSM 642)存在的Postgate培养基中的性能进行了比较研究。用开路电势测量,线性极化,电化学阻抗谱(EIS)和扫描电子显微镜(SEM)进行了电化学研究。在没有细菌的Postgate培养基中,以及在不锈钢中所预期的那样,观察到在AISI 304钢上形成了保护性表面钝化膜。在测量腐蚀电位(E {sub}(corr))时,应注意到电位趋于随浸入时间而上升,并且在阻抗图中观察到电荷转移电阻增加,并且相对于到其他测试过的系统。然而,在具有脱硫脱硫弧菌的Postgate培养基(菌株DSM 642)中,腐蚀电位(E {sub}(corr))的趋势并不均匀,尽管所记录的值比没有细菌的培养基高。随着浸入时间的延长,在存在细菌的情况下,观察到腐蚀产物层的特性发生了变化(由于腐蚀产物的形成所引起的影响,导致腐蚀速度的变化)。

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