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Volume 4, Issue 2, April 2016, Page: 71-80
Investigating Pitting Corrosion of Stainless Steel and Aluminium Using Scanning Vibrating Electrode Techniques and Electrochemical Noise Measurement
Chinwuba Victor Ossia, Offshore Technology Institute, Graduate School of Engineering & Technology, University of Port Harcourt, Port Harcourt, Nigeria
Charles Ugochukwu Orji, Offshore & Hydrodynamics Group, School of Marine Science & Technology, Newcastle University, Newcastle-Upon-Tyne, United Kingdom
Received: Apr. 13, 2016;       Accepted: Apr. 22, 2016;       Published: May 7, 2016
DOI: 10.11648/j.ijmea.20160402.16      View  5242      Downloads  220
Abstract
In this study, the susceptibility of aluminium (Al) and steel SS304 to pitting corrosion in FeCl3 and NaCl solutions with varying pH values were investigated using electrochemical noise (ECN) measurement and Scanning Vibrating Electrode Technique (SVET). Preliminary surface drop test of SS304 in FeCl3 solution and total immersion test of Al in NaCl solution indicated higher pitting of samples at scratches simulated by scribe. Total immersion test on both SS304 and Al indicated that protecting a sample with epoxy-resin mold does not completely eliminate crevice attack. ECN tests results showed that Al suffered severe time-variant corrosion in FeCl3 solution unlike SS304. The results of SVET tests conducted after 24h immersion indicated that the early pits captured on Al samples were more intense than the later ones. Higher corrosion rates were obtained for samples in NaCl solution of pH 2.89 compared to pH 7.21, indicating that pitting increased with acidity. SVET maps obtained corroborated Scanning Electron Microscopy (SEM) images of the sampled surfaces. However, though SVET was unable to capture pitting of SS304 in the solutions, SEM image revealed pitting activity on the sample in FeCl3 solution.
Keywords
Scanning Vibrating Electrode Technique (SVET), Electrochemical Noise (ECN), Coefficient of Variation (CoV)
To cite this article
Chinwuba Victor Ossia, Charles Ugochukwu Orji, Investigating Pitting Corrosion of Stainless Steel and Aluminium Using Scanning Vibrating Electrode Techniques and Electrochemical Noise Measurement, International Journal of Mechanical Engineering and Applications. Vol. 4, No. 2, 2016, pp. 71-80. doi: 10.11648/j.ijmea.20160402.16
Copyright
Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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