激光功率对Zr基非晶复合涂层微观组织与耐腐蚀性能的影响  

Effect of laser power on microstructure and corrosion resistance of Zr based amorphous composite coating

作　　者：陈天雄 胡立威 赵玲 李晋锋[1] 乐国敏[1] 罗晋如 王小英[1] 戚力 刘学[1] CHEN Tian⁃xiong;HU Li⁃wei;ZHAO Ling;LI Jin⁃feng;LE Guo⁃min;LUO Jin⁃ru;WANG Xiao⁃ying;QI Li;LIU Xue(Institute of Materials,China Academy of Engineering Physics,Mianyang 621908,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China;School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)

机构地区：[1]中国工程物理研究院材料研究所,四川绵阳621908 [2]燕山大学材料科学与工程学院,河北秦皇岛066004 [3]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《材料热处理学报》2020年第1期117-122,共6页Transactions of Materials and Heat Treatment

基　　金：四川省科技计划(2019YFG0217);国家自然科学基金(51601176)

摘　　要：选取单质混合粉末,在纯Zr基板上利用激光熔覆技术制备了Zr-Cu-Ni-Al非晶涂层。采用X射线衍射分析仪(XRD)、扫描电镜(SEM)、显微硬度仪及电化学工作站研究了激光功率对熔覆层显微组织与性能的影响。结果表明:熔覆涂层由非晶相、金属间化合物及部分金属氧化物等共同组成,熔覆涂层树枝晶尺寸随着激光功率的增加而增大,熔覆涂层的硬度随着树枝晶尺寸增大而降低,涂层硬度最高可达(567.1±12.3)HV0.5,是基体硬度的4.2倍;当激光功率为1000 W,扫描速率为800 mm/min时,涂层的耐蚀性能最好,其中自腐蚀电位为-0.182 V,电流密度为5.2×10^-8 A/cm^2。Zr-Cu-Ni-Al amorphous coating was prepared on pure Zr substrate by laser coating with mixed metal powders as raw materials. The effect of laser power on microstructure and properties of the coating was studied by means of X-ray diffraction analyzer(XRD), scanning electron microscopy(SEM), microhardness instrument and electrochemical workstation. The results show that the coating is composed of amorphous phase, intermetallic compound and some metal oxides. The dendritic size of the coating increases with the increase of laser power, and the hardness of the coating decreases with the increase of dendritic size. The highest hardness of the coating is(567.1±12.3) HV0.5, which is 4.2 times of that of the substrate. When the laser power is 1000 W and the scanning rate is 800 mm/min, the corrosion resistance of the coating is the best, the self-corrosion potential is-0.182 V, and the current density is 5.2×10^-8 A/cm^2.

关 键 词：激光熔覆 微观组织 Zr-Cu-Ni-Al涂层 耐蚀性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]