Electrochemical Investigation on the Acid Corrosion Control of Mild Steel using Biopolymer as an Inhibitor

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-02-01 DOI:10.4152/pea.202003149

Y. Sushmitha, P. Rao

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引用次数: 3

Abstract

The present work highlights the results of the application of a green inhibitor for material conservation. The anticorrosive performance of the pectin bio-polymer was established for the corrosion control of mild steel in a 1 M phosphoric acid medium. Electrochemical measurements such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) studies were adopted for the corrosion inhibition studies. The studies were carried out by varying the concentrations of pectin in the temperature range from 303 K to 318 K. Conditions were optimized to get maximum inhibition efficiency. The surface morphology study was done by scanning electron microscope (SEM), and elemental mapping was done using energy dispersive X-ray (EDX) studies to confirm the adsorption and interaction of the inhibitor with the material. Studies showed an increase in the inhibition efficiency with an increase in the concentration of pectin and also in the temperature. Maximum inhibition efficiency of 70% was achieved by the addition of 800 ppm of inhibitor. Pectin acted as a mixed type inhibitor by bringing down both cathodic and anodic reactions. Kinetic and thermodynamic parameters revealed chemical adsorption of pectin onto the mild steel surface. A suitable mechanism was proposed for the adsorption of pectin which was reaffirmed by the surface morphology studies. Pectin emerged as a potential eco-friendly green inhibitor for the corrosion control of mild steel, with economic benefits.

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生物聚合物缓蚀剂对低碳钢酸腐蚀控制的电化学研究

本工作重点介绍了绿色抑制剂在材料保护方面的应用结果。为控制低碳钢在1M磷酸介质中的腐蚀，建立了果胶生物聚合物的防腐性能。电化学测量，如动电位极化（PDP）和电化学阻抗谱（EIS）研究被用于缓蚀研究。通过在303K至318K的温度范围内改变果胶的浓度来进行研究。优化条件以获得最大的抑制效率。通过扫描电子显微镜（SEM）进行表面形态研究，并使用能量色散X射线（EDX）研究进行元素图谱，以确认抑制剂与材料的吸附和相互作用。研究表明，抑制效率随着果胶浓度和温度的增加而增加。通过添加800ppm的抑制剂实现了70%的最大抑制效率。果胶作为一种混合型抑制剂，可以降低阴极和阳极反应。动力学和热力学参数揭示了果胶在软钢表面的化学吸附。提出了一种合适的果胶吸附机理，表面形貌研究证实了这一点。果胶是一种潜在的环保型绿色缓蚀剂，用于低碳钢的腐蚀控制，具有经济效益。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.