The effect of molecular structure on the control of mild steel dissolution in acidic environment: theoretical, experimental and surface probe approach

被引：0

作者：

Chidiebere A.M. ^{[1
,7
]}

Christopher A. ^{[2
,7
]}

Bilar A. ^{[2
]}

Nwanonenyi S. ^{[3
,7
]}

Anadebe V.C. ^{[4
,5
]}

Njoku D. ^{[6
,7
]}

Akalezi C. ^{[2
,7
]}

Oguzie E. ^{[2
,7
]}

机构：

[1] Department of Science Laboratory Technology, Federal University of Technology, PMB 1526, Owerri

[2] Department of Chemistry, Federal University of Technology, PMB 1526, Owerri

[3] Department of Polymer, Federal University of Technology, PMB 1526, Owerri

[4] Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Tamil Nadu, Karaukudi

[5] Department of Chemical Engineering, Alex Ekwueme Federal University Ndufu Alike, Ebonyi State

[6] Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang

[7] Africa Centre of Excellence in Future Energies and Electrochemical Systems, Federal University of Technology, PMB 1526, Owerri

来源：

Safety in Extreme Environments | 2022年 / 4卷 / 3期

关键词：

Adsorption; Mild steel; Inhibition efficiency; Impedance; Polarisation;

D O I：

10.1007/s42797-022-00062-4

中图分类号：

学科分类号：

摘要：

In view of the significant inhibiting effect of environmentally friendly compounds, Atovaquone [trans-2-[4-(4-chlorophenyl)cyclohexyl]-3-hydroxy1,4-naphthalenedione (CCHN)] and Proguanil hydrochloride [1-(4-chlorophenyl)-5-isopropylbiguanide hydrochloride (CIBH)] were employed in this work. The inhibitive efficacy of the two compounds was investigated by means of open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP), respectively. Both compounds were found to be very potent in slowing the rate of deterioration of mild steel in the studied environment. The inhibitors inhibited both the anodic and cathodic reactions in a mixed-type manner. CCHN, on the other hand, proved to be more effective than CIBH, with a maximum inhibition efficiency of 95.5% compared to CIBH's inhibition efficiency of 89.7%. The obtained result was validated using the Langmuir adsorption isotherm. The theoretical adsorption of the inhibitors on the iron slab cleaved at 110 angle [Fe (110)] surface was evaluated, and CCHN was found to have a higher adsorption strength, correlating with the experimental findings. Surface investigation techniques such as scanning electron microscopy (SEM), electron diffraction X-ray (EDX) and atomic force microscopy (AFM) were used to supplement the experimental and theoretical research. The results of the experiments show that the proposed techniques have the ability to appropriately depict performance indicators within the ranges of the components under consideration. The procedure outlined will aid in the development of a suitable strategy to future tests. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

引用

页码：211 / 229

页数：18

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