Biogenic corrosion inhibition through Bacillus coagulans on mild steel in mild acidic medium

Sonika Lamba, Saraswati Patel, Rajendra Vishwakarma, Jaya Dwivedi, Swapnil Sharma
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Abstract

In the present study, the corrosion inhibition properties of Bacillus coagulans against mild steel (MS) were studied employing electrochemical procedures to monitor the real-time corrosion rate, mechanism, development of efficient mitigation strategies, and material protection. Results of the study revealed that under acidic environments B. coagulans formed a protective biofilm on MS surface and caused marked reduction in corrosion and other forms of mutilation. Characterization and electrochemical procedures were performed to investigate the inhibitory effects of B. coagulans at different pH and at different temperatures on the corrosion rate and, to determine the mechanism of corrosion prevention. The film developed on surface of the MS by B. coagulans, was crack free, compact, and lipophilic in nature and was composed of amyloid fibers, carboxylic acid, and proteins that make electrochemical reactions that, accruing on the metal–solution interface difficult and substantial reduction in corrosion rates observed. The film adhered to the surface of metal substrates shows fitting with diverse adsorption isotherm indications, with physical adsorption being the predominant pattern observed in most cases. This suggests that the interaction between the biofilm and metal surfaces is primarily governed by physical forces. To conclude, B. coagulans exhibits protective action on MS against corrosion.
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凝结芽孢杆菌在弱酸性介质中对低碳钢的生物缓蚀作用
本研究采用电化学方法研究了凝结芽孢杆菌对低碳钢(MS)的腐蚀抑制特性,以监测实时腐蚀速率、机理、开发有效的缓解策略和材料保护。研究结果表明,在酸性环境下,凝结芽孢杆菌会在低碳钢表面形成一层保护性生物膜,明显减少腐蚀和其他形式的破坏。为了研究凝结芽孢杆菌在不同 pH 值和不同温度下对腐蚀速率的抑制作用,并确定防腐蚀的机理,对其进行了表征和电化学处理。凝结芽孢杆菌在 MS 表面形成的薄膜无裂纹、致密、亲油,由淀粉纤维、羧酸和蛋白质组成,使金属-溶液界面上发生的电化学反应变得困难,从而大大降低了腐蚀速率。附着在金属基底表面的薄膜显示出与各种吸附等温线指示相匹配,在大多数情况下,物理吸附是观察到的主要模式。这表明生物膜与金属表面之间的相互作用主要受物理力的支配。总之,凝结芽孢杆菌对 MS 具有防腐蚀保护作用。
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