In:
RSC Advances, Royal Society of Chemistry (RSC), Vol. 13, No. 28 ( 2023), p. 19220-19226
Abstract:
Preferential dissolution behaviour of the austenite (γ) phase in Fe–27Cr– x C high chromium cast irons (HCCIs) immersed in 0.1 mol dm −3 H 2 SO 4 + 0.05 mol dm −3 HCl was investigated. Potentiodynamic and potentiostatic polarisation revealed that the primary and eutectic γ phases dissolved preferentially at –0.35 and 0.00 V Silver Silverchloride Electrode potential in sat. KCl (SSE) , respectively. The immersion of the HCCIs in the solution showed that the dissolution of the primary γ phase dominated for ca. 1 h, while the primary and eutectic γ phases dissolved after ca. 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.
Type of Medium:
Online Resource
ISSN:
2046-2069
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2623224-8
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