Improvement of corrosion resistance of PEO coatings on Al alloy by formation of ZnAl layered double hydroxide

被引：27

作者：

Liu, Guifan ^{[1
]}

Lu, Xiaopeng ^{[1
]}

Zhang, Xinyu ^{[1
]}

Zhang, Tao ^{[1
]}

Wang, Fuhui ^{[1
]}

机构：

[1] Northeastern Univ, Shenyang Natl Lab Mat Sci, 3-11 Wenhua Rd, Shenyang 110819, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2022年 / 441卷

基金：

中国国家自然科学基金;

关键词：

Al alloy; Layered double hydroxide; Corrosion resistance; Inhibitor; Plasma electrolytic oxidation; PLASMA ELECTROLYTIC OXIDATION; ALUMINUM; INHIBITION; AA2024-T3; PROTECTION; BEHAVIOR; RAMAN;

D O I：

10.1016/j.surfcoat.2022.128528

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Thin plasma electrolytic oxidation (PEO) coating was produced on 2024 aluminum alloy as pre-treatment process, which was subsequently treated by hydrothermal method to grow layered double hydroxide (LDH) layer to seal the open pores and defects to enhance corrosion performance of the oxide layer. Vanadate and molybdate was exchanged and loaded into LDH layer to further improve the corrosion resistance of the composite coating. The porous PEO coating was sealed substantially after growth of LDH, although thickness of the composite layer was reduced due to dissolution during post-treatment process. Exchange of inhibitors can greatly enhance the corrosion performance of the coating. The impedance of vanadate containing coating was maintained in the level of 106 omega center dot cm2 for 20 days during immersion in 3.5 wt% NaCl solution and showed superior corrosion protection for Al surface after performing neutral salt spray test for 60 days.

引用

页数：12

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