Mussel-Inspired Superhydrophobic Surfaces on 316L Stainless Steel with Enhanced Corrosion Resistance
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DUCTION
CORROSION of iron and its alloys can cause significant loss in many industries. It is important to intensify the research in corrosion resistance of ironbased metals in various environments.[1–4] Among them, 316L stainless steel (316L SS) has been widely used in marine industries and biomedical applications for its reasonable corrosion resistance, excellent strength, and high durability. However, 316L SS is generally susceptible to localized corrosion of 316L SS caused by Cl, which can hinder the wide use of these alloys.[5–8] Currently, there are two main mechanisms proposed for YUANYUAN MIAO and NING CAO are with the Key Laboratory of Unconventional Oil & Gas Development, Ministry of Education, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, P.R. China, and also with the Univ. Lille, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520 - IEMN, 59000 Lille, France. DALEI ZHANG, LIUYANG YANG, HONG JU, and XUEQIANG LIN are with the Key Laboratory of Unconventional Oil & Gas Development, Ministry of Education, School of Materials Science and Engineering. Contact email: [email protected] RABAH BOUKHERROUB is with the Univ. Lille, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520 – IEMN. HUIPING LI is with the School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong, P.R. China. YOUHAI JIN is with the Key Laboratory of Unconventional Oil & Gas Development, Ministry of Education, School of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266590, Shandong, P.R. China. Manuscript submitted May 11, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
Cl corrosion: the first is based on Cl pitting of passivized alloy due to the small size of Cl, which could go through the thick passivized coating; the other is the use of Cl atoms to replace oxygen atoms in passivized alloy to form metal chlorides, which change the structure of passivized coating. Both cases can lead to electrochemical corrosion.[9,10] Although the mechanism of corrosion propagation is complicated and not yet fully understood, initiation of localized corrosion by Cl corrosion has been widely accepted. In the past decades, several strategies have been used to slow or prevent the occurrence of localized corrosion, including building a protective film or coating on the surface of the 316L SS.[5,8,11] Among all these techniques, hydrophobic coatings have been considered as a promising method to improve the anticorrosive property.[12] According to the surface micro-nano composite structure of natural lotus leaves, plenty of artificial superhydrophobic surfaces (water contact angle (WCA) greater than 150 deg)[12,13] have been prepared by adopting different methods in recent years. Due to its waterproof property, the superior coating has enormous potential applications in many fields, such as self-cleaning, anti-icing, drag reduction, and anticorrosion.[12–16] For several decades, various methods, including
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