Effect of ion nitriding on microstructure and properties of 304 stainless steel

doi:10.13251/j.issn.0254-6051.2022.08.047

Abstract

Abstract: In order to improve the service life and the purity of the material when sieving the positive and negative materials of the lithium battery by the rotary vibrating screen, the microstructure, hardness and corrosion resistance of the 304 stainless steel test block ion nitrided at 520 ℃ for different time were studied. The hardness and depth of the nitrided layer were tested by Vickers microhardness and optical microscope, the friction and wear properties of the nitrided layer were tested by ball disc rotary friction and wear tester, the corrosion resistance was tested by electrochemical workstation, and the phase of the nitrided layer was analyzed by X-ray diffractometer. The results show that compared with the untreated 304 stainless steel, the hardness of the nitrided layer at 30 μm on 304 stainless steel is improved by 5-6 times, and the relative wear resistance of the nitrided layer is 24.5 times of that of the untreated 304 stainless steel. Although the salt corrosion resistance of the specimen ion nitrided decreases, the alkaline corrosion resistance improves. Considering the characteristics of alkaline cathode material and neutral cathode material of lithium energy battery, the 304 stainless steel grid and screen frame on the rotary vibrating screen can not only greatly improve the service life of the rotary vibrating screen, but also improve the purity of the screened materials.

Key words: 304 stainless steel, ion nitriding, hardness, wear resistance, corrosion resistance

CLC Number:

TG113

Niu Yi, He Zhanxu, Wang Mingli, Zhang Jie, Niu Wenpeng, Liu Guanjun. Effect of ion nitriding on microstructure and properties of 304 stainless steel[J]. Heat Treatment of Metals, 2022, 47(8): 287-291.

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