摘要
负向电压对微弧氧化陶瓷膜形成有极其重要的影响。电解液组成变化时,负向电压也必须作相应调整,才能确保微弧氧化过程的稳定和氧化膜的质量。在含mSiO2·nH2O的KOH复合电解液中,在负向电压60~140 V的条件下对ZAlSi12Cu2Mg1合金进行微弧氧化。采用电涡流测厚仪、SEM和XRD对陶瓷膜进行表征,研究了负向电压对厚度、表面形貌、相组成及耐磨性的影响。结果表明:随着负向电压增大,膜厚增加,膜层中有显微裂纹存在;负向电压为120 V时,膜厚达到186.7μm,耐磨性好。膜层主要由Mullite及α-Al2O3相组成,但衍射谱中α-Al2O3相峰强较高。
Negative voltage of power supply in micro-arc oxidation process has significant effects on the formation of films on surface of aluminum alloys,and it should be controlled according to the variation of components of the electrolyte.ZAlSi12Cu2Mg1 alloy was treated by micro-arc oxidation technology in KOH electrolyte contained 2.0 g /L mSiO2·nH2O at negative voltage of 60 ~ 140 V,and the coatings were characterized by eddy current thickness gauge,SEM and XRD.The influence of negative voltage of power supply on thickness,microstructure,phase component and wear resistance of the micro-arc oxidation films was investigated.The results show that the thickness of the ceramic coatings decreases at first and increases subsequently with the increase of negative voltage,and some micro-cracks are observed in the coatings formed at higher negative voltage.The coating with the maximum thickness of 186.7 μm and a low wear mass loss is obtained at 120 V negative voltage.The coatings are mainly composed of mullite and α-Al2O3 phases,and the diffraction peak intensity of the latter in XRD patterns is higher than the others.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第8期189-193,共5页
Transactions of Materials and Heat Treatment
基金
内蒙古高等学校科学研究项目(NJZY11254)
