电弧喷涂铝涂层热扩散锌封孔技术  

Zn Diffusion Sealing Technology of Arc Spraying Al Coating

作　　者：张体明[1] 赵卫民[1] 李景达 刘东明[1] 王兴强 

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580

出　　处：《中国表面工程》2013年第3期75-80,共6页China Surface Engineering

基　　金：中央高校基本科研业务费专项(11CX06067A);大学生创新创业训练计划(111042530)

摘　　要：采用在电弧喷涂铝涂层表面喷涂一层锌然后进行整体热处理的方法,使低熔点锌扩散渗入铝涂层内部,达到封闭铝涂层孔隙的目的。采用金相分析、显微硬度分析、直流极化曲线测试以及电子探针分析技术,研究了不同热扩散处理参数下锌对铝涂层的封闭效果。结果显示,熔化的锌能够扩散渗入铝涂层的内部,当保温时间为30min时,锌的渗入深度可达150μm;保温时间延长至60min时,锌的渗入深度达200μm。经锌扩散封孔的铝涂层致密性显著增强,显微硬度升高,具有锌铝伪合金的优良性能。Arc sprayed Al coating,coated with Zn on the surface,was heated at high temperatures,and Zn with a low melting point will diffuse into the porosities of the Al coating.Microhardness measurement,Tafel polarization test,optical microscope（OM） and electron probe micro-analyzer（EPMA） analysis were introduced to investigate the effects of different sealing parameters.The results show that the melted Zn can diffuse into the porosities of the Al coating.The deepness of diffusion for 30 mins and 60 mins are 150 μm and 200 μm respectively,thus increasing the compactness and microhardness,and the resulted coating may have an equivalent property to Zn/Al pseudo alloy.

关 键 词：电弧喷涂 铝涂层 热扩散 封孔 

分 类 号：TG174.442[金属学及工艺—金属表面处理]