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Accelerated pitting corrosion test of 304 stainless steel using ASTM G48; Experimental investigation and concomitant challenges

Citation

Bhandari, J and Lau, S and Abbassi, R and Garaniya, V and Ojeda, R and Lisson, D and Khan, F, Accelerated pitting corrosion test of 304 stainless steel using ASTM G48; Experimental investigation and concomitant challenges, Journal of Loss Prevention in The Process Industries, 47 pp. 10-21. ISSN 0950-4230 (2017) [Refereed Article]

Copyright Statement

© 2017 Elsevier

DOI: doi:10.1016/j.jlp.2017.02.025

Abstract

Marine and offshore structures constructed with stainless steel are regarded as having high corrosion resistance due to their superior self-passivating properties. However, they are equally susceptible to environmental degradation, especially due to pitting corrosion in highly corrosive marine environments. Pitting immersion tests performed on 304 austenitic stainless steel specimens using ASTM G48 presented significant challenges. Some of the issues encountered during these tests included unspecified experimental factors that control the pitting process such as pH, specimen size limitations, materialsí properties, and the variation on the quality of the test solution. To overcome these challenges, the effect of surface finishes and aeration of the test solution on the corrosion behavior of 304 stainless steel specimens in 6% ferric chloride were examined and compared. The result shows that an aerated solution has much lower concentrations of pits compared to quiescent solutions. Controlled aeration eliminates unwanted crevice corrosion background noise. Subsequently, to suit larger specimens, the ASTM G48 was modified. This study presents the modified ASTM G48 procedure. A series of pitting corrosion tests on stainless steel specimen with different thickness were conducted and data were statistically evaluated. The generalized extreme value distribution, such as Weibull, provides adequate statistical descriptions of the pit depth and pit diameter distributions. The modified ASTM G48 offered advantages in the extraction and interpretation of the data for pit characteristics in the accelerated pitting corrosion test simulating actual marine environment.

Item Details

Item Type:Refereed Article
Keywords:Corrosion, Offshore Structures, ASTM G48, Experiment
Research Division:Engineering
Research Group:Environmental Engineering
Research Field:Environmental Engineering Modelling
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Environmentally Sustainable Mineral Resource Activities
Objective Field:Environmentally Sustainable Mineral Resource Activities not elsewhere classified
Author:Bhandari, J (Mr Jyoti Bhandari)
Author:Lau, S (Ms Wei Ning Lau)
Author:Abbassi, R (Dr Rouzbeh Abbassi)
Author:Garaniya, V (Dr Vikram Garaniya)
Author:Ojeda, R (Dr Roberto Ojeda Rabanal)
Author:Lisson, D (Mr Denis Lisson)
ID Code:115044
Year Published:2017
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-03-06
Last Modified:2017-05-18
Downloads:0

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