赵碧芳,邹德宁,佟立波.改性纳米SiO2/环氧树脂杂化涂层对镁合金耐腐蚀性能的影响[J].表面技术,2021,50(10):322-329, 336.
ZHAO Bi-fang,ZOU De-ning,TONG Li-bo.Effect of Modified Nano-SiO2/Epoxy Resin Hybrid Coating on Corrosion Resistance of Magnesium Alloy[J].Surface Technology,2021,50(10):322-329, 336 |
| 改性纳米SiO2/环氧树脂杂化涂层对镁合金耐腐蚀性能的影响 |
| Effect of Modified Nano-SiO2/Epoxy Resin Hybrid Coating on Corrosion Resistance of Magnesium Alloy |
| 投稿时间：2020-11-20 修订日期：2021-02-27 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.10.033 |
| 中文关键词: 镁合金 硅烷 纳米二氧化硅 环氧树脂 耐蚀性 长效服役性 |
| 英文关键词:Mg alloy silane nano silica epoxy resin corrosion resistance long-term service |
| 基金项目:陕西省重点研发计划项目(2018ZDXM-GY-149) |
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| 中文摘要: |
| 目的 研究硅烷改性纳米SiO2/EP(epoxy resin)杂化涂层对镁合金的腐蚀防护作用及其长效服役性。方法 使用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)改性纳米SiO2，利用旋涂法在Mg-6.0Zn-0.5Ca-0.6Zr(质量分数)合金表面制备纳米SiO2/EP复合防护涂层。借助扫描电镜(SEM)观测涂层表面及断面形貌，使用原子力显微镜(AFM)表征涂层表面的三维形貌，采用红外衰减全反射光谱仪(ATR-FIIR)分析涂层的化学成分。通过电化学测试研究复合涂层对腐蚀介质的阻隔作用，以及对镁合金试样耐腐蚀性能的影响。结果 纳米SiO2/EP复合涂层内部形成了致密的三维网络状结构，具有良好的致密性。由极化曲线得，涂覆复合涂层的镁合金试样的自腐蚀电流密度由1.31×10−5 A/cm2降低到了2.40×10−9 A/cm2，减小了4个数量级;腐蚀速率由1.61 mm/a降低到1.32×10−5 mm/a，减小了5个数量级，表明SiO2与EP之间强烈的交互作用使涂层具有优异的阻挡作用，有效地改善了镁合金试样的耐蚀性能。由涂层长效服役性看，SiO2/EP涂层在3.5%NaCl溶液里浸泡336 h后，没有出现腐蚀介质在涂层内部扩散的情况。结论 SiO2/EP杂化涂层显著提高了镁合金试样的耐蚀性能，其致密的三维网络状结构有效地阻隔了H2O、Cl−等腐蚀介质在涂层内部的扩散。 |
| 英文摘要: |
| To study the corrosion protection effect of silane-modified nano-SiO2/EP (epoxy resin) hybrid coating for Mg alloy substrate and its long-term service performance. The nano-SiO2 was modified by γ-(2,3-epoxy propoxy) propytrimethoxysilane, and then the nano-SiO2/EP composite protective coating was prepared on the surface of Mg-6.0Zn-0.5Ca-0.6Zr (wt.%) alloy by spin-coating technology. The scanning electron microscope (SEM) was used to observe the coating surface and cross-sectional morphology, and the atomic force microscope (AFM) was carried out to characterize the three-dimensional morphology of the coating surface, and the attenuated total reflectance infrared spectroscopy (ATR-FIIR) was applied to analyze the chemical composition of the coating. The barrier effect of composite coating to corrosive media and the influence on the corrosion resistance of magnesium alloy was measured through electrochemical tests. A dense three-dimensional network structure was formed within the nano-SiO2/EP composite coating, which exhibited high compactness. According to the results of polarization curves, the self-corrosion current of the magnesium alloy substrate of the composite coating decreased from 1.31×10−5 A/cm2 to 2.40×10−9 A/cm2, which reduced by four orders of magnitude. The corrosion rate was decreased from 1.61 mm/a to 1.32×10−5 mm/a, which exhibited a reduction of 5 orders of magnitude. The strong interaction between SiO2 and EP conferred the coating an outstanding barrier effect and remarkably improved the corrosion resistance of the Mg alloy substrate. In terms of the long-term serviceability of the coating, the SiO2/EP coating immersed in a 3.5 wt% NaCl solution for 336 h, and there was no diffusion phenomenon of the corrosive medium in the coating. The SiO2/EP hybrid coating significantly improves the corrosion resistance of the Mg alloy substrate, and the dense three-dimensional network structure effectively blocks the diffusion of H2O, Cl−, and other corrosive media in the coating. |
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