Comparative study of high temperature chloride corrosion resistance and mechanism of Inconel625 and Inconel601 alloys

doi:10.13251/j.issn.0254-6051.2023.09.035

Abstract

Abstract: High temperature chloride ion corrosion resistance and corrosion mechanism of Inconel625 and Inconel601 alloys were studied by means of SEM, EDS and XRD. The corrosion kinetics curves, corrosion products and surface and cross section morphology of the corrosion layer of the two alloys were compared and analyzed under the condition of chloride ion corrosion at 1100 ℃. The results show that both Inconel625 and Inconel601 alloys exhibit rapid corrosion in the early stage and gentle corrosion in the later stage. The high temperature chloride corrosion resistance of the Inconel625 alloy is better than that of the Inconel601 alloy. In the corrosion process of the Inconel625 alloy, an oxide film containing complex oxides is formed. The main corrosion products of the Inconel601 alloy are Cr₂O₃, AlFeO₃ and Al₁₈Cr₅ phases, while the main corrosion products of the Inconel625 alloy are Al₂O₃, Fe₂O₃, Cr₅O₁₂ and NiCrO₄ phases. The Inconel625 alloy has better corrosion resistance than the Inconel601 due to the pinning effect of Nb element and the formation of NiCrO₄ with spinel structure, which increases the adhesion of oxide film.

Key words: Inconel625 alloy, high temperature, chloride ion, corrosion resistance

CLC Number:

TG178

Wu Yong, Meng Shixu, Sun Qingyun, Chen Hui, Xia Siyao, Yang Fu, Xia Chunhuai, Yang Hanzhe. Comparative study of high temperature chloride corrosion resistance and mechanism of Inconel625 and Inconel601 alloys[J]. Heat Treatment of Metals, 2023, 48(9): 208-213.

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