摘要
利用激光熔覆的方法在AZ31B镁合金表面制备镍铝青铜涂层,采用扫描电镜、X射线衍射仪和显微硬度仪对涂层的微观形貌、物相以及显微硬度进行分析,采用PS–168A型电化学测量系统对涂层以及母材进行电化学腐蚀性能测试。结果表明,涂层内白色基体上析出富Cr的玫瑰状和块状的K相,涂层的物相主要由FeAl3、Al3Ni、Ni、Cu、Cr等组成,涂层的显微硬度最高可达602 HV0.2,较母材的50 HV0.2提高了约11倍,涂层的腐蚀电位?1.02 V较母材的?1.49 V提高了0.47 V。
The nickel aluminum bronze coating was prepared on AZ31B magnesium alloy by laser cladding,The morphology,phase and microhardness of the coatings were analyzed by scanning electron microscopy（SEM）,X-ray diffraction and Microhardness tester,the electrochemical corrosion of the coatings and base metal were tested by PS-168A type electrochemical measuring system.The results show that Cr-rich Rose-like and nubby K-phase are precipitated on white matrix structure,the main phases of coating consist of FeAl3,Al3Ni,Ni,Cu and Cr,the maximum microhardness is up to 602 HV0.2,11 times higher than the base metal（50 HV0.2）.Moreover,the corrosion potential of coating is-1.02 V,increased 0.47 V compared with the base metal.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2011年第1期44-48,88,共6页
China Surface Engineering
基金
山西省自然科学基金资助项目(2008011044)
关键词
镁合金
激光熔覆
镍铝青铜
magnesium alloy
laser cladding
nickel aluminum bronze
