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Thin Nacre-Biomimetic Coating with Super-Anticorrosion Performance
ACS Nano ( IF 15.8 ) Pub Date : 2018-09-06 00:00:00 , DOI: 10.1021/acsnano.8b05183 Yan Zhang 1, 2 , Jingwei Tian 2 , Jing Zhong 2 , Xianming Shi 1, 2
ACS Nano ( IF 15.8 ) Pub Date : 2018-09-06 00:00:00 , DOI: 10.1021/acsnano.8b05183 Yan Zhang 1, 2 , Jingwei Tian 2 , Jing Zhong 2 , Xianming Shi 1, 2
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The rigorous organic and inorganic laminated structure of nacre has been developed by millions of years of biological evolution against various external impacts, including mechanical loadings and chemical attacks. Nacre-biomimetic materials have been recognized as an effective strategy to achieve high strength and toughness simultaneously. However, the understanding of nacre-like structure from the perspective of corrosion protection is still very limited. This work investigates the anticorrosion performance of nacre-biomimetic GO/epoxy (NBGE) coatings with alternating layers. Potentiodynamic polarization measurements indicated that the corrosion rate of steel protected by the NBGE coating with 5 layers of GO and 6 layers of epoxy (5NBGE) and a total thickness of 17 μm was 20 times slower than that of steel under the pure epoxy coating twice as thick in 3.5 wt % NaCl solution. Electrochemical impedance spectroscopy measurements revealed the importance and functions of the GO layers in NBGE coatings. The 5NBGE coating exhibited better performance than carbon-based nanoparticle/epoxy mixed coatings. The superior anticorrosion performance of the NB5G6E coating was supported by photographic observations, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and chloride diffusion measurements. The strong cross-linking layer-by-layer structure of NBGE coatings was proved by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction analyses. The anticorrosion mechanism of the NBGE coatings was interpreted by the mitigation of chemical reactions occurring at the steel–coating interface due to the restricted intrusion of O2, H2O, and Cl– through the reduced pores and defects by the intercalated GO layers in the coatings.
中文翻译：
具有超强防腐性能的稀薄仿生仿生涂层
珍珠母经过严格的有机和无机层压结构，经过数百万年的生物进化发展起来，可以抵抗各种外部影响，包括机械载荷和化学侵蚀。珍珠母仿生材料已被公认为是同时实现高强度和韧性的有效策略。然而，从腐蚀防护的角度对珍珠母状结构的理解仍然非常有限。这项工作研究了具有交替层的珍珠母仿生GO /环氧树脂（NBGE）涂层的防腐性能。电位动力极化测量表明，在5层GO和6层环氧树脂（5NBGE）的总厚度为17μm的NBGE涂层的保护下，钢的腐蚀速率比纯环氧涂层的钢慢了20倍。在3.5 wt％的NaCl溶液中浓缩。电化学阻抗谱测量显示了NBGE涂层中GO层的重要性和功能。5NBGE涂层表现出比碳基纳米颗粒/环氧树脂混合涂层更好的性能。照相观察，扫描电子显微镜，能量色散X射线光谱学和氯离子扩散测量结果证明了NB5G6E涂层具有出色的防腐性能。通过傅里叶变换红外光谱，X射线光电子能谱和X射线衍射分析证明了NBGE涂层具有很强的逐层交联结构。NBGE涂层的防腐蚀机理可以通过减少由于O的侵入而在钢-涂层界面发生的化学反应来解释。2，H 2 O和Cl –通过减少的孔隙和缺陷（通过在涂层中插入GO层实现）。
更新日期：2018-09-06
中文翻译：
具有超强防腐性能的稀薄仿生仿生涂层
珍珠母经过严格的有机和无机层压结构，经过数百万年的生物进化发展起来，可以抵抗各种外部影响，包括机械载荷和化学侵蚀。珍珠母仿生材料已被公认为是同时实现高强度和韧性的有效策略。然而，从腐蚀防护的角度对珍珠母状结构的理解仍然非常有限。这项工作研究了具有交替层的珍珠母仿生GO /环氧树脂（NBGE）涂层的防腐性能。电位动力极化测量表明，在5层GO和6层环氧树脂（5NBGE）的总厚度为17μm的NBGE涂层的保护下，钢的腐蚀速率比纯环氧涂层的钢慢了20倍。在3.5 wt％的NaCl溶液中浓缩。电化学阻抗谱测量显示了NBGE涂层中GO层的重要性和功能。5NBGE涂层表现出比碳基纳米颗粒/环氧树脂混合涂层更好的性能。照相观察，扫描电子显微镜，能量色散X射线光谱学和氯离子扩散测量结果证明了NB5G6E涂层具有出色的防腐性能。通过傅里叶变换红外光谱，X射线光电子能谱和X射线衍射分析证明了NBGE涂层具有很强的逐层交联结构。NBGE涂层的防腐蚀机理可以通过减少由于O的侵入而在钢-涂层界面发生的化学反应来解释。2，H 2 O和Cl –通过减少的孔隙和缺陷（通过在涂层中插入GO层实现）。
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