Preparation and Corrosion Resistance of Anodic Oxidation Coatings on 2198 and 5A90 Al-Li Alloys

被引：4
|
作者：
Wang, Henan [1 ]
Li, Xinming [1 ]
He, Linbo [1 ]
Cui, Baolei [1 ]
Liu, Chunzhong [1 ]
机构：
[1] Shenyang Aerosp Univ, Inst Mat Sci & Engn, Shenyang 110316, Liaoning, Peoples R China
来源：
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2019年 / 34卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Al-Li alloy; the mixture solution; anodic oxidation coating; corrosion resistance; thickness; EXFOLIATION CORROSION; NACL SOLUTION; BEHAVIOR; MECHANISM;
D O I：
10.1007/s11595-019-2026-x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
2198 and 5A90 Al-Li alloys were anodized with a constant DC potential in 18%H2SO4 solution (Solu.A) and the mixture solution of 18%H2SO4+5%C2H2O4 (Solu.B) at room temperature. 12 and 11 V was optimized as the applied oxidation potential for 2198 and 5A90 alloys, respectively. Cross-sectional morphology, surface morphology and elements distribution of anodic oxidation coatings were observed by scanning electron microscope equipped with energy dispersive X-ray analysis (SEM/EDX). Corrosion resistance was tested by potentiodynamic polarization plot in 3.5%NaCl solution. The results showed that the thicknesses of coatings obtained at the selected potential in Solu.A and Solu.B were about 50 m/110 m for 2198 alloy and 80 m/110 m for 5A90 alloy. In both solutions, anodic oxidation coatings of 2198 alloy were primarily composed of Al oxides; those of 5A90 alloy were mainly consisted of Al oxides and a small amount of Mg oxides. The results of potentiodynamic polarization showed that anodic oxidation coatings of 2198 and 5A90 Al-Li alloys had better corrosion resistances than that of untreated alloys.
引用
收藏
页码：132 / 137
页数：6
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