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Evaluation of Corrosion Inhibition of 316L Stainless Steel by Permanganate Ions in Chloride Solution

1Chemistry Department, Nuclear Research Centre of Birine, BO: 180 Ain Oussera, 17200, Djelfa, Algeria

2Nuclear Engineering Research and Development Unit, BO 399 Algiers,, Algeria

3Yahia Fares University, Ain-D’heb, 26000, Medea, Algeria

4 Crystallography Laboratory, Physics Department, Faculty of Exact Sciences, Mentouri Brothers University, Route Ain El Bey, Constantine 25000, Algeria

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Received: 2 Mar 2021; Revised: 8 Apr 2021; Accepted: 9 Apr 2021; Available online: 12 Apr 2021; Published: 30 Jun 2021.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2021 by Authors, Published by BCREC Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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The efficiency of permanganates to inhibit the scale deposit captured the attention for more investigation on their role as corrosion inhibitor. In this article, the effect of permanganate as corrosion inhibitor on 316L stainless steel in NaCl solution is investigated. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) have been performed by varying the electrode stirring speed, the concentration of permanganate ions, pH and the temperature. The results show that the permanganate ions increase the cathodic and anodic currents under effect of stirring speed, due to oxygen reduction reaction and the reduction of permanganate ions. Electrochemical results indicate that the deposit of manganese oxide (MnO2) inhibits the pitting corrosion. The inhibition efficiency is up to 98 % for 104 mol.dm3 of permanganate. The temperature reduces the effectiveness of permanganates against pitting corrosion, the pitting potential shifts cathodically from +0.395 V vs. Saturated Calomel Electrode (SCE) at 298 K to +0.275 V vs. SCE at 343 K. Surface morphology of the deposit oxide films and electrode are studied by emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared and Differential Scanning Calorimetry. The analysis of the deposit layer by X-ray diffraction revealed the presence of δ-MnO2 form, with a crystallite size of 3.17 nm.  Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (


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Keywords: pitting corrosion; stainless steel; permanganate; manganese oxide; corrosion inhibitor
Funding: Birine Nuclear Research Centre, Djelfa, Algeria

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