張超，牛宗偉*，姚知深，王旭，田佩佩（山東理工大學機械工程學院，山東 淄博 255049）
摘要：采用自制超聲噴丸預處理裝置(主要包括超聲波發生器、超聲換能器和震動槽)對AZ31B 鎂合金表面進行硝酸鈰浸漬超聲噴丸處理[Ce(NO3)3?6H2O 3 g/L，適量直徑為0.2 ~ 0.8 mm 的玻璃珠，溫度20 ~ 40 °C，時間5 min]后再微弧氧化(MAO)。研究了硝酸鈰浸漬超聲噴丸對微弧氧化過程電壓及所得膜層表面形貌和耐蝕性的影響。對鎂合金進行硝酸鈰浸漬超聲噴丸有利于縮短微弧氧化的起弧時間，降低起弧電壓，所得MAO 膜層的微孔直徑減小，表面更平整，耐蝕性提高。
文章編號：1004 – 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