期刊
SURFACE & COATINGS TECHNOLOGY
卷 411, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.126993
关键词
Aluminum alloy; Pitting corrosion; Nanostructured protective coating; Amorphous structure; Atomic layer deposition; Surface engineering
资金
- Estonian Ministry of Education and Research [IUT2-54, TLTFY14054T, IUT2-24, PSG448]
- EU through the European Regional Development Fund [TK141 (2014-2020.4.01.15-00)]
This study demonstrates effective corrosion protection on an Al-alloy AA2024-T3 through a thin ceramic coating. The coating, prepared through a two-step process, includes a chemically homogeneous base layer and a chemically resistant Al2O3/TiO2 nanolaminate. The coating shows strong corrosion resistance after extensive testing, including long-term immersion in a salt solution.
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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