暖通用6061铝合金表面Ni基等离子喷涂CoCrTaAlY/PEO涂层性能分析

利用冷喷涂技术在暖通用6061铝合金表面依次制备Ni基打底涂层,CoCrTaAlY和PEO涂层,并进行组织和耐热以及腐蚀性能测试分析,研究结果表明:CoCrTaAlY层形成了众多密实堆积颗粒,获得具有均匀分布结构的涂层;PEO层形成粗糙表面结构,表面形成了一些破碎颗粒以及不规则外形的颗粒,致密CoCrTaAlY层跟Ni基体形成了良好结合状态。试样都是在涂层和基体交界面部位发生断裂,涂层形成了比涂层和基体结合强度更大的内聚作用力。经过热震后,涂层表面并没有出现显著变化,同样存在粗糙区于光滑区两种类型的形貌,并且还有一些网状的微裂纹。经过热冲刷处理后,试样表面颜色只发生了轻度改变,涂层质量发生了先减小后增大的变化现象,涂层具备良好的耐高温氧化特性。

Surface Modification of 6061 Al-Alloy with Multilayered Coatings for Heating,Ventilation and Air-Conditioning Facilities

The surfaces of 6061 Al-alloy,an advanced material in fabrication of heating,ventilation and air conditioning(HAVC) facilities,were modified with Ni,CoCrTaAlY,and poly-ethylene oxide(PEO) multilayered coatings,deposited by successive cold-spray in air and by plasma-spray in argon atmosphere.The influence of the deposition conditions on the microstructures,oxidation/corrosion/erosion resistances and interfacial adhesion was investigated with X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy and thermal shock/scour tests for optimization of the synthesis conditions.The preliminary results show that depending on the Ni-transition layer,the cold spray is capable of depositing fairly uniform,compact Ni,CoCrTaAlY and PEO multilayered coatings with strong interfacial adhesion,and significantly improving the resistances of high-temperature oxidation/corrosion/erosion of 6061 Al-alloy.When it comes to surface modification of 6061 Al-alloy,we suggest that the results we reported may be of some technological interest in HAVC industry.