铝酸盐体系中氧化时间对碳化硅颗粒增强铝基复合材料微弧氧化膜层的影响
Effect of the time of oxidation in an aluminate electrolyte on micro-arc oxidation film of SiC particle reinforced aluminum matrix composite
杜春燕 1孙焕明 1黄树涛 2刘成炜2
作者信息
- 1. 沈阳理工大学材料科学与工程学院,辽宁 沈阳 110159
- 2. 沈阳理工大学机械工程学院,辽宁 沈阳 110159
- 折叠
摘要
[目的]探究氧化时间对碳化硅颗粒增强铝基(SiCp/Al)复合材料微弧氧化膜层的影响.[方法]选用铝酸盐体系作为电解液,对SiCp/Al复合材料进行微弧氧化处理,分析氧化时间对膜层组织结构、物相、厚度、粗糙度、结合力、电绝缘性及耐蚀性的影响.[结果]随着氧化时间延长,膜层逐渐变得连续均匀,厚度增加.若氧化时间过长,膜层会出现层叠现象,形成大尺寸微孔及裂纹,且生长速率越来越低.膜层结合力随氧化时间延长先增大后减小,在60 min时最大,达到39.85 N.氧化时间为10 min时,膜层的电绝缘性及耐蚀性最优,100 V和500 V电压下的绝缘电阻分别达到3.11×1012 Ω和1.41×1012 Ω,腐蚀电位为-0.629 8 V,腐蚀电流密度为1.332×10-7 A/cm2.[结论]SiCp/Al复合材料表面微弧氧化膜层的连续性、均匀性及生长速率均与氧化时间有关.需选择合适的氧化时间,才能制备出连续、均匀且综合性能优异的膜层.
Abstract
[Introduction]The effect of oxidation time on micro-arc oxidation(MAO)film of silicon carbide particle reinforced aluminum matrix(SiCp/Al)composite was studied.[Method]The micro-arc oxidation of SiCp/Al composite was carried out in an aluminate electrolyte.The effect of oxidation time on microstructure,phase constitution,thickness,roughness,adhesion strength,electrical insulating property,and corrosion resistance of SiCp/Al composite was discussed.[Result]With the extending of oxidation time,the MAO film gradually became continuous,uniform,and thick.Excessively long oxidation time led to a lamination structure,accompanied by the formation of large-sized micropores and cracks,and low growth rate of the MAO film.The adhesion strength of the MAO film was increased initially and then decreased,and reached the maximum value of 39.85 N at 60 min.The MAO film prepared by oxidation for 10 min had the best electrical insulation and anticorrosion performance.Its insulation resistance was 3.11×1012 Ω at 100 V and 1.41×1012 Ω at 500 V,and its corrosion potential and corrosion current density were-0.629 8 V and 1.332×10-7 A/cm2,respectively.[Conclusion]The continuity,uniformity,and growth rate of the MAO film on SiCp/Al composite are related to the oxidation time.It is necessary to select the appropriate oxidation time to prepare continuous and uniform MAO films with excellent comprehensive properties.
关键词
碳化硅颗粒增强铝基复合材料/微弧氧化/时间/厚度/结合力/电绝缘性/耐蚀性Key words
silicon carbide particle reinforced aluminum matrix composite/micro-arc oxidation/time/thickness/adhesion strength/electrical insulating property/corrosion resistance引用本文复制引用
基金项目
辽宁省教育厅基本科研项目(JYTQN2023045)
出版年
2024
NETL
NSTL
万方数据