摘要
采用微弧氧化技术，在电解质溶液中添加蛇纹石微纳米颗粒，在ZLl09铝合金表面原位生长陶瓷层，制备蛇纹石复合微弧氧化膜层。采用正交试验法，通过测定膜层厚度、表面粗糙度和膜层中蛇纹石含量，以及扫描电镜（SEM）和能谱（EDS）分析，对制备蛇纹石复合微弧氧化膜层的工艺参数进行优化研究。结果表明：双向恒压模式下制得的微弧氧化膜层表面微孔孔径较小，粗糙度较低，但膜中的蛇纹石含量较低；单向恒压和单向恒流模式下制得的微弧氧化膜层中蛇纹石含量较高，且单向恒流模式下制得的微弧氧化膜层表面裂纹明显减少；微弧氧化膜层中的蛇纹石含量、膜层厚度及粗糙度均随电流的增加而增加，随频率的增加而减少，随电解液中蛇纹石微纳米颗粒浓度的增加而增加；制备蛇纹石复合微弧氧化膜层优化后的工艺参数为：单向恒流模式，正向电流8A，频率500Hz，电解液中的蛇纹石微纳米颗粒浓度10g／L。
Serpentine composite coatings on ZL109 aluminum alloy were prepared by micro arc oxidation （MAO） technology in the electrolyte solution adding serpentine micro nanoparticles. The process parameters of serpentine composite MAO coating preparation were optimized via orthogonal tests by measuring the thickness, the surface roughness and the serpentine content of the coating, scanning electron microscope （SEM） and energy dispersive X-ray spectroscopy （EDS） analysis. The results show that the coating prepared under bidirectional constant voltage mode has smaller surface pore size and lower roughness, but the serpentine content in the coating is low; the coating prepared under unidirectional constant voltage and unidirectional constant current mode have higher content of serpentine, and the surface cracks of the coatings prepared under unidirectional constant current mode reduce significantly; the thickness, surface roughness and the serpentine content of the coating increase with the increase of the current, and decrease with the increase of the frequency, and increase with the increase of the serpentine micro-nano particles concentration in the electrolyte solution; the optimized process parameters of serpentine composite MAO coating preparation are under unidirectional constant current mode, forward current 8 A, frequency 500 Hz, the serpentine micro-nano particles concentration in the electrolyte solution 10 g/L.
作者
郑世斌
程东
于光宇
严志军
朱新河
马春生
Zheng Shibin;Cheng Dong;Yu Guangyu;Yan Zhijun;Zhu Xinhe;Ma Chunsheng(College of Marine Engineering, Dalian Maritime University, Dalian Liaoning 116026, China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第4期213-219,共7页
Heat Treatment of Metals
基金
交通部应用基础研究项目(2015-329-225-230)
关键词
铝合金
微弧氧化
蛇纹石
微纳米颗粒
工艺参数优化
aluminum alloy
micro-arc oxidation
serpentine
micro-nano particles
process parameter optimization
