Effects of Nitriding Voltage on Microstructure and Corrosion Resistance of Nitrided Layer Prepared by Liquid Plasma Electrolytic Nitriding Process
摘 要
以氨水和KCl的混合溶液为电解液, 利用液相等离子体电解渗氮工艺在180,200,220,240 V电压下于38CrMoAl钢表面制备了渗氮层, 研究了渗氮电压对渗氮层组织与耐腐蚀性能的影响。结果表明: 随着渗氮电压升高, 渗氮层中白亮层和扩散层的厚度不断增加, 当渗氮电压为240 V时, 白亮层和扩散层的厚度最大, 分别为42.9 μm和84.9 μm; 渗氮层表面均呈“火山凸起”微区形貌, 随着渗氮电压增大, “火山凸起”微区的落差逐渐增大, 孔洞分布均匀性逐渐降低, 孔径逐渐增大, 渗氮层的峰值硬度先增大后趋于稳定; 在200, 220, 240 V电压下制备渗氮层的耐腐蚀性能优于基体的; 当渗氮电压为220 V时, 渗氮层的耐腐蚀性能最好。
Abstract
The liquid plasma electrolytic nitriding technology was used to prepare nitriding layer on 38CrMoAl steel surface with voltage of 180, 200, 220, 240 V in an aqueous solution containing ammonia and KCl. The effects of nitriding voltage on microstructure and corrosion resistance of nitrided layer were studied. The results show that with the increase of nitriding voltage, the thickness of white layer and diffusion layer increased, when the voltage was 240 V, the thickness reached the maximum, which were 42.9 μm and 84.9 μm, respectively. The "bulge volcano" micro-area gap increased gradually with the increase of the voltage, the hole distribution evenness decreased and pore size increased, the peak hardness increased at first and then tended to be stable. The corrosion resistance of nitrided layer samples prepared at 200, 220 V and 240 V was higher than that of substrate sample. The corrosion resistance of sample was the best when the nitriding voltage was 220 V.
中图分类号 TG156.8 DOI 10.11973/jxgccl201601013
所属栏目 新材料 新工艺新材料 新工艺
基金项目
收稿日期 2014/12/11
修改稿日期 2015/10/30
网络出版日期
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备注钟芳兴(1988-), 男, 江西定南人, 硕士研究生。
引用该论文: ZHONG Fang-xing,CHEN Xiong-qing,XU Wu-bo,HUA Xiao-zhen,ZHOU Xian-liang. Effects of Nitriding Voltage on Microstructure and Corrosion Resistance of Nitrided Layer Prepared by Liquid Plasma Electrolytic Nitriding Process[J]. Materials for mechancial engineering, 2016, 40(1): 52~55
钟芳兴,陈雄清,许武波,华小珍,周贤良. 渗氮电压对液相等离子体电解渗氮层组织及耐腐蚀性能的影响[J]. 机械工程材料, 2016, 40(1): 52~55
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参考文献
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【2】程东, 高原, 唐光辉. 渗氮温度对3Cr13不锈钢表面离子渗氮层组织和性能的影响[J]. 机械工程材料, 2009, 33(7): 21-22.
【3】赵彦辉, 董利民, 杜昊, 等. 等离子体氮化与物理气相沉积复合处理的研究进展[J]. 机械工程材料, 2012, 36(6): 1-4.
【4】薛文斌, 金乾, 刘润, 等. 甘油浓度对不锈钢表面液相等离子体电解渗透过程的影响[J]. 中国有色金属学报, 2013,23(3): 882-887.
【5】LUK S F, LEUNG T P, MIU W S,et al. A study of the effect of average preset voltage on hardness during electrolytic surface-hardening in aqueous solution[J]. Journal of Materials Process Technology, 1999, 91: 245-249.
【6】GUPTA P, TENHUNDFELD G, DAIGLE E O, et al. Electrolytic plasma technology:science and engineering-an overview[J]. Surface and Coatings Technology,2007,201:8746-8760.
【7】NIE X, WILSON A, LEYLAND A, et al. Deposition of duplex Al2O3 /DLC coatings on Al alloys for tribological applications using a combined micro-arcoxidation and plasma-immersion ion implantation technique[J].Surface & Coatings Technology, 2000, 131(1/3): 506-513.
【8】周贤良, 朱敏, 余慧燕, 等. 热处理工艺对热轧带钢氧化皮结构及其耐蚀性的影响[J]. 材料热处理学报, 2011, 32(7): 139-144.
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