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Bacillus sp. Acting as Dual Role for Corrosion Induction and Corrosion Inhibition with Carbon Steel (CS)

机译：芽孢杆菌充当碳钢（CS）的腐蚀诱导和腐蚀抑制的双重角色

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Present work investigated the role of five different bacteria species as a corrosion inducer as well as corrosion inhibitor with carbon steel (CS). We observed the ability of different bacteria species on the metal surface attachment, biofilm formation, and determined Peroxidase, Catalase enzyme activity in the detached biofilm from the CS surface. We found that each strain has diverse conduct for surface attachment like DS1 3.3, DS2 2.5, DS3 4.3, DS4 4.0, and DS5 4.71 log cfu/cm2 and for biofilm 8.3 log cfu/cm2. The enzyme Peroxidase, Catalase was found in huge concentration inside the biofilm Peroxidase was maximum for DS4 36.0 U/ml and least for DS3 19.54 U/ml. Whereas, Catalase was highest for DS4, DS5 70.14 U/ml and least 57.2 U/ml for DS2. Scanning electron microscopy (SEM) was conducted to examine the biofilm and electrochemical impedance spectroscopy (EIS) were utilized to observe corrosion in the presence of bacteria. The electrochemical results confirmed that DS1, DS3, DS4, and DS5 strains have statistically significant MIC-factors (Microbially Influenced Corrosion) of 5.46, 8.51, 2.36, and 1.04, while DS2 protective effect factor of 0.89. Weight reduction results with carbon steel likewise supports that corrosion was initiated by DS1 and DS3, while DS2 and DS5 have no any impact though with DS4 we watched less weight reduction however assumed no role in the corrosion. We established the relation of Peroxidase enzyme activity of the isolates. DS1, DS3 and having Peroxidase in the range 22.18, 19.54 U/ml which induce the corrosion whereas DS2 and DS5 having 28.57 and 27.0 U/ml has no any effect and DS4 36 U/ml has inhibitory effect, increasing concentration inhibiting the corrosion. For Catalase DS1, DS3 have 67.28, 61.57 U/ml which induce corrosion while DS2 and DS5 57.71 and 59.14 U/ml also has no effect whereas DS4 70.14 U/ml can inhibit corrosion. Results clearly express that in a specific range both enzymes can induce the corrosion. Our goals are to pursuit and locate the potential role of the enzyme in corrosion induction and inhibition. There is still further work is proceeded for the more profound perception.
机译：目前的工作调查了五种不同细菌作为碳钢（CS）的腐蚀诱导剂和腐蚀抑制剂的作用。我们观察了金属表面附着，生物膜形成上不同细菌种类的能力，并确定了与CS表面分离的生物膜中过氧化物酶，过氧化氢酶的活性。我们发现每种菌株对表面附着的行为不同，例如DS1 3.3，DS2 2.5，DS3 4.3，DS4 4.0和DS5 4.71 log cfu / cm 2 和生物膜8.3 log cfu / cm 2 。发现过氧化物酶过氧化氢酶在生物膜中的浓度很高，过氧化物酶的最高浓度为DS4 36.0 U / ml，最低为DS3 19.54 U / ml。而过氧化氢酶对于DS4最高，DS5为70.14 U / ml，对于DS2最低为57.2 U / ml。进行扫描电子显微镜（SEM）检查生物膜，并利用电化学阻抗谱（EIS）观察细菌存在下的腐蚀。电化学结果证实，DS1，DS3，DS4和DS5菌株具有统计上显着的MIC因子（微生物影响腐蚀）分别为5.46、8.51、2.36和1.04，而DS2保护作用因子为0.89。碳钢减轻重量的结果同样支持DS1和DS3引发腐蚀，而DS2和DS5没有任何影响，尽管使用DS4观察到重量减轻较少，但认为在腐蚀中没有作用。我们建立了分离株过氧化物酶活性的关系。 DS1，DS3和过氧化物酶的范围在22.18、19.54 U / ml范围内，会引起腐蚀，而DS2和DS5的28.57和27.0 U / ml则无作用，而DS4 36 U / ml则具有抑制作用，增加了抑制腐蚀的浓度。对于过氧化氢酶DS1，DS3的67.28、61.57 U / ml会引起腐蚀，而DS2和DS5的57.71和59.14 U / ml也没有作用，而DS4 70.14 U / ml则可以抑制腐蚀。结果清楚地表明，在特定范围内，两种酶均可诱导腐蚀。我们的目标是追求并确定酶在腐蚀诱导和抑制中的潜在作用。为了获得更深刻的理解，还需要进一步的工作。

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