Tang Hongyu, Qu Zuopeng, Wang Lei, Ye Huaiyu, Fan Xuejun, Zhang Guoqi
Department of Microelectronics, Faculty of Electronic, Mathematics and Information, Delft University of Technology, Delft 2628 CT, The Netherlands.
School of Renewable Energy, North China Electric Power University, Beijing, 102206, China.
Phys Chem Chem Phys. 2019 Aug 21;21(33):18179-18187. doi: 10.1039/c9cp03381e.
This paper presents the anti-corrosion application of polyvinylbutyral/tin sulfide (PVB/SnS) composites for the first time, where the liquid-phase exfoliated (LPE) SnS nanosheets are uniformly embedded in the PVB matrix. The measurement results of the potentiodynamic polarization, the electrochemical impedance spectroscopy (EIS) and the scanning electronic microscopy (SEM) show that PVB/SnS composite coatings show the excellent corrosion protection behavior for copper under 3.0% NaCl solution. Besides, we investigated the anti-corrosion performance with different contents of SnS nanosheets. The results show that embedding 0.1 wt% SnS nanosheets in the PVB matrix can greatly improve the anti-corrosion properties of the coating due to the enhanced "Labyrinth effect" of the coatings. In addition, the results of the molecular dynamic analysis further show the high interaction energy between PVB/SnS composites and copper, which is attributed to the high aspect-ratio of LPE-SnS nanosheets. Moreover, the scratch tests reveal that the PVB/SnS composite coatings exhibit weak corrosion-promotion activity, indicating a promising potential application in the corrosion protection of the metal surface for ocean engineering. The methods for enhancing the inhibited corrosion-promotion activity of the semiconductor material SnS-based composite coatings could be expanded to other n-type and p-type semiconductors.
本文首次介绍了聚乙烯醇缩丁醛/硫化锡（PVB/SnS）复合材料的防腐应用，其中液相剥离（LPE）的SnS纳米片均匀地嵌入PVB基体中。动电位极化、电化学阻抗谱（EIS）和扫描电子显微镜（SEM）的测量结果表明，PVB/SnS复合涂层在3.0%NaCl溶液中对铜表现出优异的防腐性能。此外，我们研究了不同含量SnS纳米片的防腐性能。结果表明，在PVB基体中嵌入0.1 wt%的SnS纳米片可以大大提高涂层的防腐性能，这是由于涂层的“迷宫效应”增强。此外，分子动力学分析结果进一步表明PVB/SnS复合材料与铜之间具有较高的相互作用能，这归因于LPE-SnS纳米片的高长径比。此外，划痕试验表明PVB/SnS复合涂层表现出较弱的腐蚀促进活性，这表明其在海洋工程金属表面防腐方面具有广阔的潜在应用前景。增强基于半导体材料SnS的复合涂层的缓蚀促进活性的方法可以扩展到其他n型和p型半导体。
