期刊论文

Cai, Qizhou(caiqizhou@mail.hust.edu.cn)

中文

功能材料

1001-9731

2015

46

21

21054-21059

10.3969/j.issn.1001-9731.2015.21.012

广东省自然科学基金资助项目（9152902001000015） 省部产学研结合资助项目（2009B090300413）

本校为其他机构

在硅酸钠电解液中添加不同浓度的钨酸钠,对6061铝合金进行微弧氧化处理,采用SEM、EDX、XRD分析了膜层的组成和结构,利用电化学工作站和全浸泡试验测试了膜层的耐蚀性。结果表明,在硅酸钠电解液中添加适量的钨酸钠,可减少膜层的微孔和裂纹的形成,提高膜层的致密性。钨酸钠促进了膜层中α-Al_2O_3相的形成、抑制莫来石的形成,并以W单质的形式留在了膜层中,当钨酸钠的浓度为2.0 g/L时膜层中α-Al_2O_3相的含量达66%。电化学试验结果表明,钨酸钠能提高膜层的耐蚀性,当钨酸钠浓度4.0 g/L时,交流阻抗相对未添加Na_2WO_4的硅酸盐电解液中形成膜层的阻抗提高了1个数量级,在浓缩的80 ℃流动海水中浸泡20 ...

This research concerns ceramic coatings on 6061 aluminum alloy formed by micro-arc oxidization (MAO) using sodium silicate electrolyte and varying amounts of added Na2WO4. The composition and structure of coatings are analyzed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). Corrosion resistance of coatings is tested using electrochemical workstation and high temperature seawater immersion experiments. The results show that adding the appropriate amount of Na2WO4 to the sodium si...