AZ31B镁合金盐浴碳氮钒共渗工艺

doi:10.13251/j.issn.0254-6051.2022.07.044

摘要/Abstract

摘要： 为提高AZ31B镁合金的表面硬度,改善其摩擦磨损性能及耐蚀性能,采用盐浴碳氮钒共渗工艺在AZ31B镁合金表面形成高硬度碳、氮化合物渗层,并用数字显微硬度计、光学显微镜、X射线衍射仪、X射线能谱仪、摩擦磨损试验和电化学测试分析渗层表面硬度、截面显微形貌、渗层表面物相组成、耐磨性和耐蚀性等。结果表明,盐浴碳氮钒共渗处理使AZ31B镁合金表面形成主要由VC、VN等高硬度金属化合物组成的渗层,渗层表面硬度最高达到283.1 HV0.05,相比原始试样和碳氮共渗处理试样分别提升280%和62%;相比原始试样,碳氮钒共渗试样的摩擦因数和磨损量分别降低约30%和50%,自腐蚀电位提高60 mV,自腐蚀电流密度降低一个数量级,表明盐浴碳氮钒共渗工艺能够显著提高AZ31B镁合金的表面硬度,提升其摩擦磨损性能及耐蚀性能。

关键词: 镁合金, 碳氮钒共渗, 盐浴, 显微硬度, 摩擦磨损, 耐蚀性能

Abstract: In order to improve the surface hardness, friction and wear properties and corrosion resistance of AZ31B magnesium alloy, a high hardness carbonitriding layer was prepared on the AZ31B magnesium alloy surface by salt bath vanadium-nitrocarburizing process. The surface microhardness, cross-section morphology, phase composition of the nitrocarburizing layer, and the wear resistance and corrosion resistance were analyzed by means of digital microhardness tester, optical microscope, X-ray diffractometer, X-ray energy spectrometer, friction and wear test and electrochemical test. The results show that a layer mainly composed of high hardness metal compounds such as VC and VN is formed on the AZ31B magnesium alloy surface after salt bath vanadium-nitrocarburizing treatment. The maximum surface hardness of the vanadium-nitrocarburizing layer is up to 283.1 HV0.05, which is increased by 280% and 62% respectively compared with that of the untreated and the carbonitriding treated. Comparing with the untreated alloy, the friction coefficient and wear mass loss of the alloy after vanadium-nitrocarburizing are reduced by about 30% and 50% respectively, the self-corrosion potential is increased by 60 mV and the self-corrosion current density is reduced by an order of magnitude, which showing that the salt bath vanadium-nitrocarburizing process can significantly improve the surface hardness, friction and wear properties and corrosion resistance of AZ31B magnesium alloy.

Key words: magnesium alloy, vanadium-nitrocarburizing, salt bath, microhardness, friction and wear, corrosion resistance

中图分类号:

TG166.4

周留研, 刘利国, 马晖, 陈东旭. AZ31B镁合金盐浴碳氮钒共渗工艺[J]. 金属热处理, 2022, 47(7): 259-263.

Zhou Liuyan, Liu Liguo, Ma Hui, Chen Dongxu. Salt bath vanadium-nitrocarburizing process of AZ31B magnesium alloy[J]. Heat Treatment of Metals, 2022, 47(7): 259-263.

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