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王晓明,朱胜,杨柏俊,陈永星.Al基金属玻璃涂层孔隙特性的精确表征及对其腐蚀行为的影响规律[J].稀有金属材料与工程(英文),2017,46(12):3779~3784.[Wang Xiaoming,Zhu Sheng,Yang Bai-jun,Chen Yongxing.The Accurate Characterization for Pores’ Properties of Aluminum-based Metallic Class Coating and the Influence of Corrosion Behavior from Pores to Coating[J].Rare Metal Materials and Engineering,2017,46(12):3779~3784.]
The Accurate Characterization for Pores’ Properties of Aluminum-based Metallic Class Coating and the Influence of Corrosion Behavior from Pores to Coating
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Received:September 30, 2016  Revised:December 24, 2016
DOI:
Key words: Aluminum-based metallic class coating  Low-temperature supersonic spray  XRT  pores  Corrosion behavior
Foundation item:国际合作项目(2015 DFG51920);军队计划重点基金资助项目(9140A27030312JB3501)
Author NameAffiliationE-mail
Wang Xiaoming 装甲兵工程学院 uwangxm@126.com 
Zhu Sheng 装甲兵工程学院  
Yang Bai-jun 中国科学院金属研究所  
Chen Yongxing Academy of Armored Force Engineering 1043933832@qq.com 
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Abstract:
      Choosing Al86Ni6Y4.5Co2La1.5 amorphous powder and adopting self-developed low-temperature supersonic spray system, the paper has prepared the aluminum-based metallic glass coating on ZM5 surface with good corrosion resistance, analyzed the pores’ types and causes in the coating, selected the X-ray three-dimensional imaging method for the determination of the coating’s porosity and the characterization of the pores’ geometry features, clarified the influence of pores on the corrosion behavior of the coating. The results show that the coating consists mainly of four types of conventional porosity defects,which are macro-type、layer-type、 microsphere-type and microscopic-type; The porosities are substantially less than 1% and have little change along the thickness direction, the pores are nearly spherical, and their average sizes are less than 10μm, especially about 5μm; different porosities in the coating are shown a wide range of self passivation interval, closer self corrosion potentials and positive correlation between the corrosion current densities and porosities. Individual special pores with the characteristics of large-size, through-type and at the border are the root cause of coating’s corrosion failure.