搅拌速度对LA141镁锂合金纳米复合镀层的影响  

Effect of Stirring Speed on LA141 Magnesium-Lithium Alloy Nano-composite Coating

作　　者：张奇[1] 马勤[1] 江恬恬 ZHANG Qi;MA Qin;JIANG Tiantian(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《有色金属工程》2020年第12期48-54,共7页Nonferrous Metals Engineering

摘　　要：为进一步扩大超轻LA141镁锂合金的应用范围,提高其表面硬度、耐蚀性和耐磨性,采用化学复合镀的方式在LA141镁锂合金表面制备Ni-P/nano-Al2O3复合镀层,主要研究了搅拌速度对复合镀层物相结构、微观形貌、硬度、耐蚀性和耐磨性的影响。结果表明:随着搅拌速度的增加,复合镀层表面的纳米粒子沉积量先增加后减少,其硬度、耐蚀性和耐磨性同样呈现出先增加后减小的趋势。当镀液搅拌速度为600 r/min时,复合镀层的耐蚀性最好,其腐蚀电位和腐蚀电流密度分别为-0.502 V和3.85×10^-5 A/cm^2;当镀液搅拌速度为800 r/min时,复合镀层的纳米粒子沉积量最多,耐磨性最好,其摩擦系数在0.45~0.55,磨痕宽度约为750μm。In order to further expand the application range of ultra-light LA141 magnesium-lithium alloy,improve its surface hardness,corrosion resistance and wear resistance simultaneously,the Ni-P/nano-Al2O3 composite coating was prepared on the surface of the LA141 magnesium-lithium alloy by chemical composite plating.The effects of stirring speed on the phase structure,micromorphology,hardness,corrosion resistance and wear resistance of the composite coating were studied.The results show that with the increase of the stirring speed,the deposition amount of nanoparticles on the surface of the composite coating increases firstly and then decreases,and the hardness,corrosion resistance,wear resistance also show the trend of first increasing and then decreasing.When the plating solution stirring speed is 600 r/min,the corrosion resistance of the composite coating is the best,its corrosion potential and corrosion current density are-0.502 V and 3.85×10^-5 A/cm^2 respectively;When the plating solution stirring speed is 800 r/min,the composite coating has the largest deposition amount of nanoparticles and the best wear resistance.The friction coefficient is between 0.45 and 0.55,and the width of the wear scar is about 750μm.

关 键 词：镁锂合金 化学复合镀 耐蚀性 耐磨性 

分 类 号：TG178[金属学及工艺—金属表面处理]