Understanding two corrosion mechanisms of 20Cr25Ni2.5Al alumina-forming austenitic alloy in supercritical carbon dioxide

Journal of Materials Research and Technology 2026 Open access

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Authors: Ming Shu, Wenjin Jim Zheng, Qing Zhou, Bin Wu, Zhiyang Yu, Xinfu Gu, Hongliang Ming, Jun Xiao
DOI: 10.1016/j.jmrt.2026.08.286
Cited by: 0
References: 46

Abstract

The 20Cr25Ni2.5Al AFA alloy demonstrated an order of magnitude lower oxidation rate constant compared to the reference alloy in supercritical CO2 (sCO2) at 20 MPa and 650 ℃. Both alloys exhibited uniform corrosion and localized corrosion zones, but the fraction of localized corrosion zones was reduced by more than 50% in Al - modified alloy. The atomic structure of the multilayer oxide scales in both zones was precisely characterized through AC-TEM analysis. The Ni rich precipitates resulted in the disruption of continuous Al2O3 layer and localized corrosion. The corrosion mechanisms of the AFA alloy in sCO2 were schematically elucidated.

Fields of Study & Subjects

High-Temperature Coating Behaviors Metal and Thin Film Mechanics Advanced ceramic materials synthesis

Publication details

Journal / source
Journal of Materials Research and Technology
Volume
44
Pages
5187–5202
Publication date
31 August 2026
Language
EN