Investigation of Corrosion Inhibition of Mild Steel in 0.5 M H2SO4 with Lachancea fermentati Inhibitor Extracted from Rotten Grapefruits (Vitis vinifera): Adsorption, Thermodynamic, Electrochemical, and Quantum Chemical Studies

IF 3.7 Q2 CHEMISTRY, PHYSICAL ACS Physical Chemistry Au Pub Date : 2023-12-08 DOI:10.1021/acsphyschemau.3c00055
Baluchamy Tamilselvi, Durvas Seshian Bhuvaneshwari*, Periyakaruppan Karuppasamy*, Sethuramasamy Padmavathy, Santhosh Nikhil, Surendra Boppanahalli Siddegowda and H C Ananda Murthy*, 
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Abstract

Corrosion inhibition of mild steel (MS) was studied using Lachancea fermentati isolate in 0.5 M H2SO4, which was isolated from rotten grapes (Vitis vinifera) via biofilm formation. Biofilm over the MS surface was asserted by employing FT-IR and FE-SEM with EDXS, electrochemical impedance spectroscopy (EIS), AFM, and DFT-ESP techniques. The weight loss experiments and temperature studies supported the physical adsorption behavior of the corrosion inhibitors. The maximum inhibition efficiency (IE) value (90%) was observed at 293 K for 9 × 106 cfu/mL of Lachancea fermentati isolate. The adsorption of Lachancea fermentati isolate on the surface of MS confirms Langmuir’s adsorption isotherm model, and the −ΔG values indicate the spontaneous adsorption of inhibitor over the MS surface. Electrochemical studies, such as potentiodynamic polarization (PDP) and EIS were carried out to investigate the charge transfer (CT) reaction of the Lachancea fermentati isolate. Tafel polarization curves reveal that the Lachancea fermentati isolate acts as a mixed type of inhibitor. The Nyquist plots (EIS) indicate the increase in charge transfer resistance (Rct) and decrease of double-layer capacitance (Cdl) values when increasing the concentration of Lachancea fermentati isolate. The spectral studies, such as UV–vis and FT-IR, confirm the formation of a complex between MS and the Lachancea fermentati isolate inhibitor. The formation of biofilm on the MS surface was confirmed by FE-SEM, EDXS, and XPS analysis. The proposed bioinhibitor shows great potential for the corrosion inhibition of mild steel in acid media.

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从烂葡萄柚(葡萄属)中提取的 Lachancea fermentati 抑制剂在 0.5 M H2SO4 中抑制低碳钢腐蚀的研究:吸附、热力学、电化学和量子化学研究
在 0.5 M H2SO4 溶液中使用 Lachancea fermentati 分离物对低碳钢(MS)的腐蚀抑制作用进行了研究,该分离物是从腐烂葡萄(葡萄属)中通过生物膜形成分离出来的。通过使用傅立叶变换红外光谱(FT-IR)、FE-SEM、EDXS、电化学阻抗光谱(EIS)、原子力显微镜(AFM)和 DFT-ESP 技术,确定了 MS 表面的生物膜。失重实验和温度研究证实了缓蚀剂的物理吸附行为。在 293 K 下,9 × 106 cfu/mL 的 Lachancea fermentati 分离物的抑制效率(IE)值最大(90%)。Lachancea fermentati 分离物在 MS 表面的吸附证实了 Langmuir 吸附等温线模型,-ΔG 值表明抑制剂在 MS 表面的自发吸附。为了研究 Lachancea fermentati 分离物的电荷转移(CT)反应,还进行了电位极化(PDP)和 EIS 等电化学研究。塔菲尔极化曲线显示,Lachancea fermentati 分离物是一种混合型抑制剂。奈奎斯特图(EIS)表明,当 Lachancea fermentati 分离物的浓度增加时,电荷转移电阻(Rct)增加,双层电容(Cdl)值降低。紫外-可见光和傅立叶变换红外光谱等光谱研究证实,MS 与 Lachancea fermentati 分离物抑制剂之间形成了复合物。FE-SEM、EDXS 和 XPS 分析证实了 MS 表面生物膜的形成。所提出的生物抑制剂在酸性介质中抑制低碳钢腐蚀方面显示出巨大的潜力。
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期刊介绍: ACS Physical Chemistry Au is an open access journal which publishes original fundamental and applied research on all aspects of physical chemistry. The journal publishes new and original experimental computational and theoretical research of interest to physical chemists biophysical chemists chemical physicists physicists material scientists and engineers. An essential criterion for acceptance is that the manuscript provides new physical insight or develops new tools and methods of general interest. Some major topical areas include:Molecules Clusters and Aerosols; Biophysics Biomaterials Liquids and Soft Matter; Energy Materials and Catalysis
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