Preparation of Al-based Amorphous/Nanocrystalline Composite Coating on Mg-based Alloys Precipitated by Arc Spraying Process  

作　　者：Zhang Zhibin Liang Xiubing Xu Binshi 

机构地区：[1]Acad Armored Forces Engn, State Key Lab Remfg, Beijing 100072, Peoples R China [2]Beijing Univ Technol, Beijing 100124, Peoples R China

出　　处：《稀有金属材料与工程》2012年第S1期439-442,共4页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(50905185);National"863"project of China(2009AA03Z342)

摘　　要：The Al-based amorphous and nanocrystalline composite coatings with the composition of Al-Ni-Y-Co and Al-Ni-Mm-Fe were prepared on AZ91 Mg-based alloys by high velocity arc spraying technique(HVAS).The structure character of the coatings indicates that coatings contain the mixture of amorphous phases and crystalline and there are both less than 2%porosity.The electrochemical tests of the coatings and the substrate were studied.The coatings show the passivation ability during polarization,but AZ91 Mg-based alloys show little passivation.The corrosion current density of the coatings is lower than that of AZ91 Mg-based alloys.The results show that the coatings have an excellent corrosion resistance for AZ91 Mg-based alloys in 5 wt%NaCl solution.The Al-based amorphous and nanocrystalline composite coatings with the composition of Al-Ni-Y-Co and Al-Ni-Mm-Fe were prepared on AZ91 Mg-based alloys by high velocity arc spraying technique(HVAS).The structure character of the coatings indicates that coatings contain the mixture of amorphous phases and crystalline and there are both less than 2%porosity.The electrochemical tests of the coatings and the substrate were studied.The coatings show the passivation ability during polarization,but AZ91 Mg-based alloys show little passivation.The corrosion current density of the coatings is lower than that of AZ91 Mg-based alloys.The results show that the coatings have an excellent corrosion resistance for AZ91 Mg-based alloys in 5 wt%NaCl solution.

关 键 词：high VELOCITY ARC SPRAYING microstructure AMORPHOUS and NANOCRYSTALLINE Mg-based alloy corrosion resistance 

分 类 号：TG146.4[一般工业技术—材料科学与工程]