A new method to determine the synergistic effects of area ratio and microstructure on the galvanic corrosion of LAS A508/309 L/308 L SS dissimilar metals weld

Okonkwo BO, Ming H, Wang J, Han EH, Rahimi E, Davoodi A, Hosseinpour S (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of Materials Science & Technology Elsevier

Book Volume: 78

Pages Range: 38-50

DOI: 10.1016/j.jmst.2020.10.044

Abstract

The synergistic effects of area ratio and microstructure on the galvanic corrosion of A508/309 L/308 L dissimilar metals weld (DMW) are studied by a multi-analytical approach. It was demonstrated that decreasing the anode/cathode surface area ratio obviously enhances the corrosion rate of A508, both locally and globally. Deeper analyses of the AFM results enabled quantitative comparison of the corrosion behaviour of the different surface constituents. It was revealed that in the galvanic interaction of the DMW, the grain refined region corrodes most, followed by the partial grain refined region and base metal matrix of the A508, respectively. The electrochemical localization index (LI) estimation method and AFM analysis both confirmed the presence of a mixed (localized and uniform) corrosion phenomenon occurring on the surface of the A508 anode metal in the galvanic interaction of the dissimilar metals. Finally, the degree of synergism equation was utilized to describe the synergistic effects of anode/cathode area ratio and the microstructure of the samples on the galvanic corrosion of LAS A508/309L/308L SS DMW.

Authors with CRIS profile

Saman Hosseinpour Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Involved external institutions

Institute of Metal Research Chinese Academy of Sciences (IMR CAS) CN China (CN) Ferdowsi University of Mashhad IR Iran, Islamic Republic of (IR)

How to cite

APA:

Okonkwo, B.O., Ming, H., Wang, J., Han, E.H., Rahimi, E., Davoodi, A., & Hosseinpour, S. (2021). A new method to determine the synergistic effects of area ratio and microstructure on the galvanic corrosion of LAS A508/309 L/308 L SS dissimilar metals weld. Journal of Materials Science & Technology, 78, 38-50. https://dx.doi.org/10.1016/j.jmst.2020.10.044

MLA:

Okonkwo, Bright O., et al. "A new method to determine the synergistic effects of area ratio and microstructure on the galvanic corrosion of LAS A508/309 L/308 L SS dissimilar metals weld." Journal of Materials Science & Technology 78 (2021): 38-50.

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