Effect of tempering process under 1 T magnetic field on corrosion resistance of 25CrMo48V steel

doi:10.13251/j.issn.0254-6051.2023.09.018

Abstract

Abstract: 25CrMo48V ultra-high strength steel was quenched at 1000 ℃ for 30 min, then placed in a high temperature box furnace under 1 T magnetic field to carry out tempering at 600 ℃ for 0, 10, 30, 180, and 240 min, and tempering at 200, 300, 400, 500, and 600 ℃ for 60 min, respectively. The effect of tempering parameters under the same magnetic field on the corrosion resistance of the steel in 3.5%NaCl solution was studied. The effect of tempering parameter on the corrosion properties of the samples in 3.5%NaCl solution under the same magnetic field was observed and analyzed by optical microscopy, electrochemical impedance spectroscopy and potentiodynamic polarization curve. The results show that the electrochemical impedance spectroscopy plots of all the specimens are similar in shape, indicating that the electrochemical mechanism of the specimens is not changed after tempering, and the capacitive reactance capacitive reactance arc radius is large, the best corrosion resistance is obtained. The self-corrosion current density of the sample tempered at 400 ℃ for 60 min is the lowest.

Key words: 25CrMo48V steel, tempering process, heat treatment with magnetic field, electrochemical properties, corrosion resistance

CLC Number:

TG156.97

Yang Saixuan, Yang Xiaobin, Lu Panpan, Zhao Qian, Dong Zhizhong, Dong Ji. Effect of tempering process under 1 T magnetic field on corrosion resistance of 25CrMo48V steel[J]. Heat Treatment of Metals, 2023, 48(9): 106-109.

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