Comparative analysis of corrosion resistance in molten aluminum of H13 steel with different surface treatments

doi:10.13251/j.issn.0254-6051.2022.02.039

Abstract

Abstract: H13 steel specimens were subjected to nitriding and sulphonitrocarburizing treatments after vacuum heat treatment, and then immersed in 700 ℃ high temperature molten aluminum for corrosion test. And the cross-section microstructure, mass loss and phase composition of the specimens before and after corrosion were analyzed in detail. The results show that the interface bonding mode of infiltration layer is similar for the nitrided specimen and the sulphonitrocarburizing specimen, which is smooth and dense, the boundary between layer and matrix is relatively flat. There are Fe₃N, Fe₂N, FeS, Fe₃C phases in the surface compound area of the sulphonitrocarburized specimen, with the FeS phase being a typical close-packed hexagonal crystal structure with higher hardness. There are Fe₃N and Fe₂N phases in the surface compound area of the nitrided specimen, and the surface hardness of which is higher than that of the sulphonitrocarburized specimen. Under the same corrosion conditions, the mass loss and mass loss rate of the vacuum heat treated specimen are 7.5 g and 21.1%, respectively, those of the nitrided specimen are 4.1 g and 11.2%, respectively, those of the sulphonitrocarburized specimen are 0.8 g and 2.2%, respectively. The iron-aluminum compound of the specimens is embedded in the steel matrix in a zigzag shape, and the thickness is 184.75, 88.56 and 35.88 μm, respectively. The main compound after corrosion by molten aluminum is Fe₂Al₅, and the sulphonitrocarburized specimen can form FeS and Fe₃C with the H13 steel matrix due to the addition of S and C, showing the best high temperature corrosion resistance in molten aluminum.

Key words: H13 steel, vacuum heat treatment, nitriding, sulphonitrocarburizing treatment, molten aluminum erosion

CLC Number:

TG176

Wang Duo, Zhao Guohua, Yang Wenhao, Wang Yupeng, Wang Shuaikang, Bao Mingdong. Comparative analysis of corrosion resistance in molten aluminum of H13 steel with different surface treatments[J]. Heat Treatment of Metals, 2022, 47(2): 219-223.

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