Effective corrosion protection of aluminum alloy AA2024-T3 with novel thin nanostructured oxide coating

被引：33
|
作者：
Merisalu, Maido [1 ]
Aarik, Lauri [1 ]
Kozlova, Jekaterina [1 ]
Mandar, Hugo [1 ]
Tarre, Aivar [1 ]
Sammelselg, Vaino [1 ]
机构：
[1] Univ Tartu, Inst Phys, W Ostwald Str 1, EE-50411 Tartu, Estonia
来源：
SURFACE & COATINGS TECHNOLOGY | 2021年 / 411卷
关键词：
Aluminum alloy; Pitting corrosion; Nanostructured protective coating; Amorphous structure; Atomic layer deposition; Surface engineering; ATOMIC LAYER DEPOSITION; CHROMATE CONVERSION COATINGS; LOCALIZED CORROSION; AL; 2024-T3; S PHASE; FILMS; RESISTANCE; ACID; MICROSTRUCTURE; PARTICLES;
D O I：
10.1016/j.surfcoat.2021.126993
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Effective corrosion protection via a thin ceramic coating on an Al-alloy AA2024-T3 is demonstrated. The preparation of the coating consists of two steps. First, with a special anodizing process, a chemically homogeneous thin base layer is formed on the substrate. Then, the nanoscale pores in the base layer are sealed, and the entire surface is covered with a chemically resistant Al2O3/TiO2 nanolaminate using atomic layer deposition. The sample surface is thoroughly characterized, including linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) and testing by long-term immersion in a salt solution. The coating withstands LSV up to 10 V versus saturated calomel electrode (SCE) and salt solution immersion of 7152 h (298 days).
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页数：13
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