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

SURFACE & COATINGS TECHNOLOGY

卷:411

Article

Merisalu, Maido¹  Aarik, Lauri¹  Kozlova, Jekaterina¹  Mandar, Hugo¹  Tarre, Aivar¹  Sammelselg, Vaino¹ 

[1] Univ Tartu, Inst Phys, W Ostwald Str 1, EE-50411 Tartu, Estonia

关键词: Aluminum alloy;    Pitting corrosion;    Nanostructured protective coating;    Amorphous structure;    Atomic layer deposition;    Surface engineering;   

DOI  :  10.1016/j.surfcoat.2021.126993

来源: Elsevier

【 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).

【 授权许可】

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