孙琪,李志勇,张英乔,杨柳青,刘车凯,程凯岐.AZ91D镁合金表面激光熔覆Al-TiC涂层组织和性能的研究[J].表面技术,2017,46(1):40-44.
SUN Qi,LI Zhi-yong,ZHANG Ying-qiao,YANG Liu-qing,LIU Che-kai,CHENG Kai-qi.Microstructure and Properties of Laser Cladding Al-TiC Coating on AZ91D Magnesium Alloy[J].Surface Technology,2017,46(1):40-44
AZ91D镁合金表面激光熔覆Al-TiC涂层组织和性能的研究
Microstructure and Properties of Laser Cladding Al-TiC Coating on AZ91D Magnesium Alloy
投稿时间:2016-09-06  修订日期:2017-01-20
DOI:10.16490/j.cnki.issn.1001-3660.2017.01.007
中文关键词:  激光熔覆  镁合金  Al-TiC涂层  金属陶瓷  显微硬度  耐蚀性
英文关键词:laser cladding  magnesium alloy  Al-TiC coating  cermet  micro-hardness  corrosion resistance
基金项目:山西省重点研发计划工业项目(2016010302100345);山西省回国留学人员科研基金资助项目(2013-07)
作者单位
孙琪 中北大学 焊接研究中心,太原 030051 
李志勇 中北大学 焊接研究中心,太原 030051 
张英乔 中北大学 焊接研究中心,太原 030051 
杨柳青 中北大学 焊接研究中心,太原 030051 
刘车凯 中北大学 焊接研究中心,太原 030051 
程凯岐 中北大学 焊接研究中心,太原 030051 
AuthorInstitution
SUN Qi Welding Research Center, North University of China, Taiyuan 030051, China 
LI Zhi-yong Welding Research Center, North University of China, Taiyuan 030051, China 
ZHANG Ying-qiao Welding Research Center, North University of China, Taiyuan 030051, China 
YANG Liu-qing Welding Research Center, North University of China, Taiyuan 030051, China 
LIU Che-kai Welding Research Center, North University of China, Taiyuan 030051, China 
CHENG Kai-qi Welding Research Center, North University of China, Taiyuan 030051, China 
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中文摘要:
      目的 研究Al-TiC涂层组织和性能的特性,以提高镁合金涂层的硬度和耐蚀性能。方法 采用Nd:YAG固体激光器,在AZ91D镁合金表面通过激光熔覆制备Al-TiC涂层,采用光学显微镜、X射线衍射仪、显微硬度计、电化学工作站,对熔覆层的组织形貌、物相结构、显微硬度和耐蚀性能进行测定和分析。结果 Al-TiC涂层的主要组成相有AlTi3(C,N)0.6,Al3Mg2,Mg2Al3,Al和TiC等。激光熔覆层的厚度约为0.35 mm,表面成型良好,结合层晶粒细小,熔覆层与镁合金基体之间结合良好,呈大波浪形。熔覆层试样的平均显微硬度为224HV,约为基体显微硬度(62HV)的4倍,由此表明熔覆层对镁合金硬度有明显的增强作用。镁合金基体的自腐蚀电位为-1.475 V,自腐蚀电流密度为7.556×10–5 A/cm2,熔覆层试样的自腐蚀电位为-1.138 V,自腐蚀电流密度为4.828×10–5 A/cm2,与镁合金基体相比,熔覆层的腐蚀电位值增加,腐蚀电流密度值变小,熔覆层的耐蚀性能得到提高。结论 采用激光熔覆技术,能够在AZ91D镁合金基体表面制备Al-TiC涂层,由于硬质相AlTi3(C,N)0.6,Al3Mg2,Mg2Al3,TiC等的存在,熔覆层的显微硬度和耐蚀性能显著提高。
英文摘要:
      In order to improve micro-hardness and corrosion resistance of magnesium alloy coating by studying the characteristics of microstructure and properties of Al-TiC coating. Al-TiC laser cladding layer on AZ91D magnesium alloy was prepared by using Nd: YAG solid laser. Microstructure morphology, phase structure, micro-hardness and corrosion resistance of the cladding layer were investigated with the aid of optical microscope (OM), X-ray diffraction (XRD) measurement, micro-hardness tester and electrochemical workstation. It can be seen that the Al-TiC coating were mainly composed of AlTi3(C,N)0.6, Al3Mg2, Mg2Al3, Al, TiC, etc. The thickness of the laser cladding layer was about 0.35 mm. The surface of laser cladding was well formed, and the grain size of the interface layer was refined. There was a good bond between the Al-TiC coating and the substrate, and it presented the shape of a big wave. The average micro-hardness of cladding layer sample was 224 HV, which was about four times of the matrix micro-hardness (62 HV), thus indicating that Al-TiC coating had significant potentiation to AZ91D magnesium alloy. The self-corrosion potential of magnesium alloy substrate was -1.475 V. Its current density of self-corrosion was 7.556×10–5 A/cm2. The self-corrosion potential of the cladding layer sample was -1.138 V. And the current density of self-corrosion was 4.828×10–5 A/cm2. Compared with the magnesium alloy substrate, corrosion potential value of the cladding layer increased, the corrosion current density value decreased and the corrosion resistance of cladding layer could be improved. Using laser cladding technology can prepare Al-TiC coating on AZ91D magnesium alloy. Since the existence of hard phase AlTi3(C,N)0.6, Al3Mg2, Mg2Al3, TiC, etc., micro-hardness and corrosion resistance of cladding layer can be increased dramatically.
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