Effect of Iron Ion on Corrosion Behavior of Inconel 625 in High-Temperature Water

Huiling Zhou; Yipeng Chen; Yi Sui; Yunfei Lv; Zhiyuan Zhu; Lanlan Yang; Zhen He; Chengtao Li; Kewei Fang

doi:10.1155/2020/9130362

Effect of Iron Ion on Corrosion Behavior of Inconel 625 in High-Temperature Water

Scanning. 2020 Oct 21:2020:9130362. doi: 10.1155/2020/9130362. eCollection 2020.

Authors

Huiling Zhou¹, Yipeng Chen¹, Yi Sui^{1

2}, Yunfei Lv³, Zhiyuan Zhu¹, Lanlan Yang¹, Zhen He¹, Chengtao Li⁴, Kewei Fang⁴

Affiliations

¹ School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
² A. O. Smith (China) Water Heater Co., Ltd., Nanjing 210038, China.
³ Chengde Petroleum College, Chengde 067000, China.
⁴ Suzhou Nuclear Power Research Institute, Suzhou 215004, China.

Abstract

The corrosion behavior of an ultralow iron nickel-based alloy Inconel 625 under high-temperature water has been evaluated. The results show that surface oxidation and pitting were the principal corrosion mechanisms of Inconel 625 during the initial immersion period. The surface layer of the oxide film is first Ni-enriched and then Fe-enriched as immersion time increases. The iron ions dissolved from the autoclave could lead to the formation of NiFe₂O₄ and have a great influence on the oxidation behavior of Inconel 625. The oxides nucleated by solid-state reactions with selective dissolution of Fe and Ni and then grew up through precipitation of cations from solution.