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Investigating corrosion behavior of Ni and Ni-20Cr in molten ZnCl2
S.K. Gill, , Y. Wang, B. Layne, L. He, S. Mahurin, J.F. Wishart, K. Sasaki
Published in Elsevier Ltd
2021
Volume: 179
   
Abstract
Corrosion of Ni and Ni-20Cr in molten ZnCl2 under argon atmosphere at 593 K was investigated using cyclic polarization in combination with various electron microscopy techniques. Cyclic polarization measurements yielded significantly lower corrosion rates for pure Ni than for Ni-20Cr. Corrosion of the Ni-20Cr alloy is attributed to selective anodic dissolution of Cr, which forms a chromium chloride film at the metal-salt interface. The corrosion in Ni and Ni-20Cr is accelerated by grain boundary attack through intergranular corrosion, followed by the formation of pore-salt network regions. The related corrosion mechanisms and dissolution kinetics are discussed. © 2020
About the journal
JournalData powered by TypesetCorrosion Science
PublisherData powered by TypesetElsevier Ltd
ISSN0010938X