Mechanistic studies of carbon steel corrosion inhibition by cashew nut shell liquid

Authors

  • J Y N Philip Department of Chemistry, University of Dar es Salaam, P.O. Box 35061, Dar es Salaam, Tanzania
  • J Buchweishaija Department of Chemistry, University of Dar es Salaam, P.O. Box 35061, Dar es Salaam, Tanzania
  • L L Mkayula Department of Chemistry, University of Dar es Salaam, P.O. Box 35061, Dar es Salaam, Tanzania

Abstract

The inhibition mechanism of the Cashew Nut Shell Liquid (CNSL) on SAE 1008 carbon steel corrosion in CO

2

 saturated 3% NaCl solutions has been studied by weight loss, UV/VIS and electrochemical techniques. The phenoxide, R-Ar-O- ions from the CNSL inhibitor were found to be responsible for the reduction of the corrosion rate of the carbon steel. Also, it was observed that the surface charge of the carbon steel electrodes was positive with respect to the solutions containing CNSL inhibitor. It is likely that the mechanism of the CNSL inhibitor adsorption involved the electrostatic attraction between the positively charged metal surface and the phenoxide ions via their negative ends. 

   
☍ View Article Analytics

Downloads

Published

2021-04-19

Issue

Vol. 28 No. 2 (2002)

Section

Articles

License

Authors who publish in The Eastern Africa Law Review retain the copyright to their work and grant the University of Dar es Salaam a non-exclusive license to publish, reproduce, and distribute the article.

This article is published under the Creative Commons Attribution 4.0 International (CC BY 4.0) License, which permits unrestricted use, distribution, adaptation, and reproduction in any medium, provided the original work is properly cited.