Metallurgical Abstracts on Light Metals and Alloys vol.55

Slippery Liquid-Infused Porous Surfaces on Aluminum for Corrosion Protection with Improved Self-Healing Ability

Kensuke Sakuraba*, Sho Kitano**, Damian Kowalski**, Yoshitaka Aoki** and Hiroki Habazaki**
*Graduate School of Chemical Sciences and Engineering, Hokkaido University
**Division of Applied Chemistry, Faculty of Engineering, Hokkaido University

[Published in ACS Applied Materials & Interfaces, Vol. 13 (2021), pp. 45089–45096]

https://doi.org/10.1021/acsami.1c13071
E-mail: Habazaki[at]eng.hokudai.ac.jp
Key Words: Slippery liquid-infused porous surface, aluminum, corrosion, self-healing, lubricant additive

Slippery liquid-infused porous surfaces (SLIPSs) can be formed by impregnating lubricants in porous surfaces with low surface energy. In this study, SLIPSs have been obtained on practically important aluminum with a porous anodic alumina layer by impregnating lubricants containing organic additives. The additive-containing lubricants change the surface slippery even without prior organic coating of the porous alumina surface. The additive-containing SLIPSs reveal a low water sliding angle of ⟨5° and markedly improved corrosion resistance in an acetic acid solution containing chloride. The SLIPSs are formed by the in-situ adsorption of the organic additives on the porous alumina surface. The scratched defects induce corrosion of the organic coating-type SLIPSs, whereas the additive-containing SLIPSs sustain high corrosion resistance even after introducing scratch defects. The adsorption of the organic additive in lubricants and refilling of the lubricant are responsible for the self-healing of the corrosion resistance. Thus, the additive-containing SLIPSs are promising self-healing corrosion-resistant surfaces.