电参数对镁合金黑色微弧氧化陶瓷膜层的影响  

Effect of electrical parameters on black micro-arc oxidation ceramic coating on magnesium alloy

作　　者：郭俊灏 张德忠 丰远航 赵涛 郭涌 陈文选 王文豪 姜秋香 GUO Junhao;ZHANG Dezhong;FENG Yuanhang;ZHAO Tao;GUO Yong;CHEN Wenxuan;WANG Wenhao;JIANG Qiuxiang(Wuhan Research Institute of Materials Protection Co.,Ltd.,CAM,Wuhan 430030,China;State Key Laboratory of Special Materials Surface Engineering,Wuhan 430030,China;Shenzhen Yuancheng Fine Chemical Development Co.,Ltd.,Shenzhen 518100,China;Shanghai Youzhuo Chemical Technology Development Co.,Ltd.,Shanghai 201800,China)

机构地区：[1]中国机械总院集团武汉材料保护研究所有限公司,湖北武汉430030 [2]特种材料表面工程全国重点实验室,湖北武汉430030 [3]深圳市原诚精细化工开发有限公司,广东深圳518100 [4]上海友卓化工科技有限公司,上海201800

出　　处：《电镀与涂饰》2025年第4期99-108,共10页Electroplating & Finishing

摘　　要：[目的]研究电流密度、占空比和频率对黑色微弧氧化(MAO)膜层外观、厚度、微观形貌、耐蚀性的影响,为工业生产中优化MAO电参数提供理论依据。[方法]以AZ91D镁合金为基体,采用以焦磷酸铜为着色盐的电解液,在电流密度2~3 A/dm2、占空比6%~16%、频率500~1000 Hz范围内进行MAO试验。通过扫描电镜、涡流测厚仪和电化学工作站检测MAO膜层的形貌、厚度及耐蚀性。[结果]随电流密度增大,膜层的微孔尺寸和厚度均增大,电流密度为2.50 A/dm2时所得MAO膜层的耐蚀性最佳。随占空比增大,膜层的微孔尺寸和厚度均减小,耐蚀性变化不大,占空比为16%时膜层具有最佳的耐蚀性。增大频率虽然对膜层微观形貌和平均厚度无显著影响,但厚度均匀性和耐蚀性有所提高。[结论]电参数对黑色微弧氧化膜层的性能具有显著影响,实际生产中应按需优化电参数组合,以获得理想的膜层性能。[Objective]To study the effects of current density,duty cycle,and frequency on the appearance,thickness,micromorphology,and corrosion resistance of black micro-arc oxidation(MAO)film,providing a theoretical basis for optimizing the electrical parameters for MAO in industry.[Method]Using AZ91D magnesium alloy as the substrate and cupric pyrophosphate as the coloring salt,micro-arc oxidation experiments were carried out under the following conditions:current density 2-3 A/dm2,duty cycle 6%-16%,and frequency 500-1000 Hz.The morphology,thickness,and corrosion resistance of the MAO films were characterized using scanning electron microscope(SEM),eddy current thickness gauge,and electrochemical workstation.[Result]Both the pore size and thickness of MAO film were increased with the increasing of current density.The MAO film obtained at 2.50 A/dm2 showed the optimal corrosion resistance.With the increasing of duty cycle,the pore size and thickness of MAO film were decreased,while the corrosion resistance changed slightly.The MAO film obtained at duty cycle of 16%had the best corrosion resistance.With the increasing of frequency,the morphology and average thickness of film were changed little,while the thickness uniformity and corrosion resistance of film were improved.[Conclusion]Electrical parameters significantly influence the properties of black MAO films.In practical production,the combination of electrical parameters should be optimized according to specific requirements to achieve ideal coating performance.

关 键 词：微弧氧化 黑色膜层 电流密度 占空比 频率 微孔 厚度 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]