引用本文:魏佳煜,邱诗惠,赵海超,杨凤.聚左旋多巴-SiO2复合材料在1MHCl中的缓蚀作用[J].中国表面工程,2022,34(2):55~62
WEI Jiayu,QIU Shihui,ZHAO Haichao,YANG Feng.Corrosion Inhibition of Polylevodopa-silica Composite in 1 M HCl[J].China Surface Engineering,2022,34(2):55~62
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聚左旋多巴-SiO2复合材料在1MHCl中的缓蚀作用
魏佳煜1,2, 邱诗惠2, 赵海超2, 杨凤1,3
1.沈阳化工大学材料科学与工程学院 沈阳 110142;2.中国科学院宁波材料技术与工程研究所海洋功能材料实验室 宁波 315201;3.沈阳先进涂层材料产业技术研究院有限公司 沈阳 123000
摘要:
随着缓蚀剂的广泛应用，传统缓蚀剂对环境和生物的负面影响日益显现，开发高水溶性、健康无毒、绿色环保的高效缓蚀剂成为研究热点。基于纳米胶体 SiO2 在水中良好的分散性、无毒等特性，通过左旋多巴(L-DOPA)在纳米胶体 SiO2 表面接枝聚合，实现聚左旋多巴(Poly-(L-DOPA))在纳米胶体 SiO2 上的负载，制备低细胞毒性、良好分散性的聚左旋多巴 -SiO2 (Poly-(L-DOPA)-SiO2)缓蚀剂，并探究 1 M HCl 中 Poly-(L-DOPA)-SiO2对 Q235 碳钢的缓蚀作用。傅里叶红外光谱 (FTIR)、紫外可见光吸收光谱(UV-vis)和 X 射线衍射(XRD)结果证实了 Poly-(L-DOPA)-SiO2的合成。电化学结果表明， 缓蚀效率随Poly-(L-DOPA)-SiO2浓度的增加而增加，当Poly-(L-DOPA)-SiO2的浓度为500 mg / L时，缓蚀效率可以达到85.9%。 添加 Poly-(L-DOPA)-SiO2使极化曲线的阴阳极斜率发生明显改变，说明阳极的金属氧化反应和阴极 O2 / H+ 的还原反应和均被抑制，是一种混合型抑制剂。扫描电子显微镜(SEM)和激光共聚焦显微镜(CLSM)观察发现，Poly-(L-DOPA)-SiO2 可以在金属表面形成保护膜有效抑制酸性溶液对碳钢的腐蚀。该缓蚀剂以生物质 L-DOPA 为原料，纳米 SiO2 为载体，是绿色高效缓蚀剂合成的新思想。
关键词:  纳米胶体 SiO2  表面接枝聚合  聚左旋多巴  缓蚀剂
DOI：10.11933/j.issn.1007-9289.20210628002
分类号:TG174
基金项目:
Corrosion Inhibition of Polylevodopa-silica Composite in 1 M HCl
WEI Jiayu1,2, QIU Shihui2, ZHAO Haichao2, YANG Feng1,3
1.College of Materials Science and Engineering, Shenyang University of Chemical Technology,Shenyang 110142 , China;2.Marine Functional Materials Laboratory, Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences, Ningbo 315201 , China;3.Shenyang Institute of Industrial Technology Co., Ltd for Advanced Coating Materials,Shenyang 123000 , China
Abstract:
With the wide application of corrosion inhibitors, the negative effects of traditional corrosion inhibitors on environment and biology are becoming more and more obvious. The development of high-efficiency corrosion inhibitors with high water solubility, health, non-toxic and green environmental protection has become a research hotspot. Based on the good dispersibility and non-toxicity of nano colloidal SiO2 in water, the loading of (Poly-(L-DOPA)) on nanocolloidal SiO2 is achieved by graft polymerization of levodopa on the surface of nanocolloidal SiO2. The prepared Poly-(L-DOPA)-SiO2 corrosion inhibitors have low cytotoxicity and good dispersibility. The corrosion inhibition of Q235 carbon steel is investigated by Poly-(L-DOPA)-SiO2 in 1 M HCl. Fourier infrared spectroscopy, UV-vis absorption spectroscopy and X-ray diffraction results confirm the synthesis of Poly-(L-DOPA)-SiO2. The electrochemical results show that the corrosion inhibition efficiency increase with the increase of Poly-(L-DOPA)-SiO2 concentration, and the corrosion inhibition efficiency reaches 85.9% when the concentration of Poly-(L-DOPA)-SiO2 is 500 mg/L. The addition of Poly-(L-DOPA)-SiO2 cause a significant change in the cathodic-anodic slope of the polarization curve, indicating that both the metal oxidation reaction at the anode and the reduction reaction of O2 / H+ at the cathode and are inhibited, which suggests it is a kind of hybrid inhibitor. Scanning electron microscopy and laser confocal microscopy observe that Poly-(L-DOPA)-SiO2 forms a protective film on the metal surface and effectively inhibits the corrosion of carbon steel by acidic solution. The corrosion inhibitor takes biomass L-DOPA as raw material and nano SiO2 as carrier, which provides a new idea for the synthesis of green and efficient corrosion inhibitor.
Key words:  nano colloidal silica  surface grafting polymerization  poly-(L-dopa)  corrosion inhibitor
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