张超，牛宗伟*，姚知深，王旭，田佩佩（山东理工大学机械工程学院，山东 淄博 255049）
摘要：采用自制超声喷丸预处理装置(主要包括超声波发生器、超声换能器和震动槽)对AZ31B 镁合金表面进行硝酸铈浸渍超声喷丸处理[Ce(NO3)3?6H2O 3 g/L，适量?#26412;?#20026;0.2 ~ 0.8 mm 的玻璃珠，温度20 ~ 40 °C，时间5 min]后再微弧氧化(MAO)。研究了硝酸铈浸渍超声喷丸对微弧氧化过程电压及所得膜层表面形貌和耐蚀性的影响。对镁合金进行硝酸铈浸渍超声喷丸有利于缩短微弧氧化的起弧时间，降?#25512;?#24359;电压，所得MAO 膜层的微?#23383;本?#20943;小，表面更平整，耐蚀性提高。
文章编?#29275;?004 – 227X (2019) 04 – 0161 – 05
Effect of ultrasonic shot peening in cerium nitrate solution on micro-arc oxidation of magnesium alloy// ZHANG Chao, NIU Zong-wei*, YAO Zhi-shen, WANG Xu, TIAN Pei-pei
Abstract: Micro-arc oxidization (MAO) of AZ31B magnesium alloy was carried out after being pretreated by ultrasonic shot peening in 3 g/L Ce(NO3)3?6H2O solution containing a suitable amount of glass beads with a diameter of 0.2-0.8 μm at temperature 20-40 °C for 5 min using a home-made equipment consisting of ultrasonic generator, transducer, and bull shaker.The effect of ultrasonic shot peening in Ce(NO3)3 solution on the voltage during MAO as well as the surface morphology and corrosion resistance of MAO film was studied. The arcing time and voltage for MAO were reduced by performing the pretreatment process. The MAO film obtained thereafter had smaller micropore diameter, evener surface, and better corrosion resistance.
Keywords: magnesium alloy; micro-arc oxidation; ultrasonic shot peening; cerium nitrate; corrosion resistance
First-author’s address: School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China