Volume 3, Issue 3, September 2019, Page: 61-69
Experimental Analysis of Corrosive Impact of Oxidizing and Non-oxidizing Environment on Sensitized Welded and Unwelded Samples of AISI 316
Silas Ezedinma Agbokwor, Department of Mechanical Engineering, Faculty of Engineering, University of Nigeria Nsukka (UNN), Nsukka, Nigeria
Daniel Oray Nnamdi Obikwelu, Department of Metallurgical and Materials Engineering, Faculty of Engineering, University of Nigeria Nsukka (UNN), Nsukka, Nigeria
Simeon Ikechukwu Neife, Department of Metallurgical and Materials Engineering, Faculty of Engineering, University of Nigeria Nsukka (UNN), Nsukka, Nigeria
Received: Sep. 11, 2019;       Accepted: Oct. 9, 2019;       Published: Oct. 28, 2019
DOI: 10.11648/j.ajmme.20190303.13      View  28      Downloads  6
Abstract
An experimental analysis was carried out to investigate the corrosivity of sensitized welded and unwelded austenitic stainless steel AISI 316, in oxidizing (H2SO4) and non-oxidizing (HCL) media. The selected samples were cut into several equal pieces. To induce sensitization, the samples were heated and soaked at 750°C at different soaking time intervals such as 30 minutes, 60 minutes, 180minutes, 300 minutes and 600 minutes followed by water quenching. The sensitized welded and unwelded samples each were subjected to immersion duration test in the oxidizing and non-oxidizing media for 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50 minutes, respectively. It was concluded from the results obtained that corrosion rate of welded and unwelded decreases as soaking time and immersion duration increases at constant soaking temperature, in non-oxidizing medium of hydroChloric acid (HCL); but the decrease in corrosion rate is more in the unwelded samples. In the oxidizing medium of sulphoric acid (H2SO4); corrosion rate of the samples decreased as immersion duration/soaking time increases. However, the welded samples experienced erratic behaviour in the oxidizing medium, having a lower corrosion rate than their unwelded counterpart surprisingly, at immersion duration between 25-50 minutes as soaking time increases at constant soaking temperature of 750°C.
Keywords
Austenitic Stainless Steel AISI 316, Corrosion Rate, Sensitization, Immersion Duration, Oxidizing and Non-oxidizing Media, Soaking Temperature, Soaking Time, Welded and Unwelded
To cite this article
Silas Ezedinma Agbokwor, Daniel Oray Nnamdi Obikwelu, Simeon Ikechukwu Neife, Experimental Analysis of Corrosive Impact of Oxidizing and Non-oxidizing Environment on Sensitized Welded and Unwelded Samples of AISI 316, American Journal of Mechanical and Materials Engineering. Vol. 3, No. 3, 2019, pp. 61-69. doi: 10.11648/j.ajmme.20190303.13
Copyright
Copyright © 2019 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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