Al含量对Al-Mg_2Si复合涂层耐蚀耐磨性能的影响  

Influence of Al Content on Corrosion and Wear Resistance of Al-Mg_2Si Composite Coatings

作　　者：范春[1] 龙威[1] 周小平[1] FAN Chun;LONG Wei;ZHOU Xiao-ping(Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, Chin)

机构地区：[1]湖北工业大学绿色轻工材料湖北省重点实验室,武汉430068

出　　处：《表面技术》2018年第2期225-230,共6页Surface Technology

基　　金：国家自然科学基金(51171062)~~

摘　　要：目的在AZ31B镁合金表面火焰喷涂制备Al-Mg_2Si复合涂层,研究其耐腐蚀和耐磨性能。方法用SEM、电化学测试仪、高速往复摩擦磨损测试仪和超景深三维显微镜检测分析不同成分配比的Al-Mg_2Si复合涂层的耐腐蚀和摩擦磨损性能。结果 Al-Mg_2Si复合涂层的电位较AZ31B镁合金基体正,且Al含量越少,电位正移越明显。Al(20%)-Mg_2Si复合涂层的自腐蚀电位正移得最多,正移了0.5288 V;自腐蚀电流密度最小,为3.298×10-6 A/cm2。Al加入量越少,复合涂层的磨损率和摩擦系数越小,当Al质量分数为20%时,两者均达到最小值,分别为2.48×10-4 mm3/(N·mm)和0.25。结论 Al含量越少,Al-Mg_2Si复合涂层的耐蚀和耐磨性能越好。This paper aims to study the corrosion and wear of Al-Mg2Si composite coating by spraying it on AZ31 B magnesium alloy surface. The corrosion resistance and wear resistance of coatings with different composition proportions were characterized by scanning electron microscopy, electrochemical testing, friction wear testing machine and ultra-depth three-dimensional Microscope. It showed that the corrosion resistance of Al-Mg2Si composite coating sealed was much higher than that of AZ31 B magnesium alloy, and the less the content of Al, the more obvious the potential shift was. The positive displacement of Al（20%）-Mg2Si coating was the most, which was shifted 0.5288 V, and the corrosion current density was minimum 3.298×10-6 A/cm2. Furthermore, the less the amount of Al addition, the smaller the wear rate and friction coefficient of the coating, and the wear rate that was 2.48×10-4 mm3/（N·mm） and friction coefficient which was 0.25 were lower when the content of Al was 20%. The less Al content of Al-Mg2Si composite coating is, the better the corrosion and wear resistance are.

关 键 词：AZ31B镁合金 火焰喷涂 Al-Mg2Si复合涂层 耐蚀性 耐磨性 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG174.442[金属学及工艺—金属材料]