LD31铝合金在常规硫酸体系中阳极氧化膜的研究

Study of Anodic Oxide Coatings on LD31 A Al Alloy in 15% Sulphuric Acid

本文研究了 LD31铝合金在15%硫酸中阳极氧化行为。测定了恒电流密度下氧化电压与时间的关系和氧化膜厚度与时间的关系。比较了 LD31铝合金与纯铝阳极氧化的一些异同点。用超薄切片技术配合TEM 观察分析氧化膜截面形貌,由此得到氧化膜的结构模型。通过用 STEM 配合 EDAX 测定了 LD31铝合金氧化膜的组成,并得出了氧化膜主要组成元素在氧化膜截面上的线分布。用超薄切片技术配合选区电子衍射方法测定了氧化膜的物相组成。提出了 LD31铝合金在15%硫酸溶液中阳极氧化膜的生成机理模型。对 LD31铝合金阳极氧化膜的一些性能如耐蚀性、耐磨性等进行了测定,并与纯铝进行了比较。

Anodic behavior on LD31 A1 in 15% sulphuric acid is studied,and compared with that on very pure A1(99.99%).The thin sections of oxide films on LD31 A1 alloy have been pro- duced by ultramicrotomy and their morphologys examined by STEM.The structure model of oxide film is examined by STEM combined with EDAX and ultromicrotomed sections by electron diffraction.The growth mechamism of anodic oxide film on LD31 A1 alloy in 15% H_2SO_4 is also put forward.(p.31-35)