铝合金表面微弧氧化纳米SiO₂复合涂层的元素及物相分析

索相波¹,邱 骥²,朱海燕²

(1.酒泉卫星发射中心 技术部,甘肃 酒泉 732750;;2.装甲兵工程学院 装备再制造工程系,北京 100072)



摘要:

为提高微弧氧化层性能,通过向微弧氧化电解液中添加纳米SiO₂颗粒,在7A52铝合金表面制备了纳米SiO₂复合微弧氧化层.利用扫描电镜、能谱仪和X射线衍射仪表征了纳米SiO₂复合微弧氧化层的微观组织、元素分布特征及物相组成.研究表明:纳米SiO₂颗粒与微弧氧化层复合生长到一起,在微弧氧化层中大致均匀分布；纳米SiO₂在微弧氧化层中主要以无定形态存在,同时SiO₂与微弧氧化层主体成分Al₂O₃发生相变反应,生成新物相-莫来石.

关键词:  微弧氧化  铝合金  纳米复合  相组成  涂层

DOI：10.11951/j.issn.1005-0299.20130209

分类号:

基金项目:“十二五”装备预先研究资助项目(51327040101).



Analysis of elements and phases of nano-SiO₂ composite layer formed on aluminum alloy by micro-arc oxidation

SUO Xiang-bo¹,QIU Ji²,ZHU Hai-yan²

(1.Department of General Technology,JIUQUAN Satellite Launching Center,Jiuquan 732750,China; ;2.Faculty of Remanufacture Engineering,Academy of Armored Force Engineering,Beijing 100072,China)

Abstract:

Nano-SiO₂ composite layer was prepared on aluminum alloy surface via micro-arc oxidation.This was achieved by adding nano-SiO₂ particles into the electrolyte.The microstructure,element distribution and phase composition of the nano-SiO₂ composite layer were characterized using scanning electron microscopy,energy dispersive spectroscopy and X-ray diffraction.The results showed that nano-SiO₂ particles were combined into the oxide layer and were roughly and evenly distributed;Nano-SiO₂ in the micro-arc oxidation layer was mainly amorphous.A new phase-mullite was produced from the phase transition reaction between SiO₂ and Al₂O₃,which were the main content of oxide layer.

Key words:  micro-arc oxidation  aluminum alloy  Nano-composites  phase composition  coating