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Article Abstract
Preferential dissolution behaviour of the austenite (γ) phase in Fe-27Cr-C high chromium cast irons (HCCIs) immersed in 0.1 mol dm HSO + 0.05 mol dm HCl was investigated. Potentiodynamic and potentiostatic polarisation revealed that the primary and eutectic γ phases dissolved preferentially at -0.35 and 0.00 V, respectively. The immersion of the HCCIs in the solution showed that the dissolution of the primary γ phase dominated for 1 h, while the primary and eutectic γ phases dissolved after 1 h. However, the carbide phases remained undissolved during the dissolution of the γ phases. Furthermore, the corrosion rate of the HCCIs increased with the increasing C content owing to the increase in the contact potential difference values of the γ and carbide phases. The change in electromotive force due to C addition was related to the accelerated corrosion rate of the γ phases.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10291255 | PMC |
| http://dx.doi.org/10.1039/d3ra01015e | DOI Listing |
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