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Investigating Pitting Corrosion of Stainless Steel and Aluminium Using Scanning Vibrating Electrode Techniques and Electrochemical Noise Measurement

Received: 13 April 2016     Accepted: 22 April 2016     Published: 7 May 2016
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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.

Published in International Journal of Mechanical Engineering and Applications (Volume 4, Issue 2)
DOI 10.11648/j.ijmea.20160402.16
Page(s) 71-80
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2016. Published by Science Publishing Group

Keywords

Scanning Vibrating Electrode Technique (SVET), Electrochemical Noise (ECN), Coefficient of Variation (CoV)

References
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    Chinwuba Victor Ossia, Charles Ugochukwu Orji. (2016). Investigating Pitting Corrosion of Stainless Steel and Aluminium Using Scanning Vibrating Electrode Techniques and Electrochemical Noise Measurement. International Journal of Mechanical Engineering and Applications, 4(2), 71-80. https://doi.org/10.11648/j.ijmea.20160402.16

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    ACS Style

    Chinwuba Victor Ossia; Charles Ugochukwu Orji. Investigating Pitting Corrosion of Stainless Steel and Aluminium Using Scanning Vibrating Electrode Techniques and Electrochemical Noise Measurement. Int. J. Mech. Eng. Appl. 2016, 4(2), 71-80. doi: 10.11648/j.ijmea.20160402.16

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    AMA Style

    Chinwuba Victor Ossia, Charles Ugochukwu Orji. Investigating Pitting Corrosion of Stainless Steel and Aluminium Using Scanning Vibrating Electrode Techniques and Electrochemical Noise Measurement. Int J Mech Eng Appl. 2016;4(2):71-80. doi: 10.11648/j.ijmea.20160402.16

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  • @article{10.11648/j.ijmea.20160402.16,
      author = {Chinwuba Victor Ossia and Charles Ugochukwu Orji},
      title = {Investigating Pitting Corrosion of Stainless Steel and Aluminium Using Scanning Vibrating Electrode Techniques and Electrochemical Noise Measurement},
      journal = {International Journal of Mechanical Engineering and Applications},
      volume = {4},
      number = {2},
      pages = {71-80},
      doi = {10.11648/j.ijmea.20160402.16},
      url = {https://doi.org/10.11648/j.ijmea.20160402.16},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20160402.16},
      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.},
     year = {2016}
    }
    

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  • TY  - JOUR
    T1  - Investigating Pitting Corrosion of Stainless Steel and Aluminium Using Scanning Vibrating Electrode Techniques and Electrochemical Noise Measurement
    AU  - Chinwuba Victor Ossia
    AU  - Charles Ugochukwu Orji
    Y1  - 2016/05/07
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    N1  - https://doi.org/10.11648/j.ijmea.20160402.16
    DO  - 10.11648/j.ijmea.20160402.16
    T2  - International Journal of Mechanical Engineering and Applications
    JF  - International Journal of Mechanical Engineering and Applications
    JO  - International Journal of Mechanical Engineering and Applications
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    PB  - Science Publishing Group
    SN  - 2330-0248
    UR  - https://doi.org/10.11648/j.ijmea.20160402.16
    AB  - 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.
    VL  - 4
    IS  - 2
    ER  - 

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Author Information
  • Offshore Technology Institute, Graduate School of Engineering & Technology, University of Port Harcourt, Port Harcourt, Nigeria

  • Offshore & Hydrodynamics Group, School of Marine Science & Technology, Newcastle University, Newcastle-Upon-Tyne, United Kingdom

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