锆前驱体对ZrO2-TiO2防腐涂层表面形貌和化学特性的影响

I. Stambolova, D. Stoyanova, M. Shipochka, N. Boshkova, A. Eliyas, S. Simeonova, N. Grozev, N. Boshkov
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引用次数: 5

摘要

采用溶胶-凝胶法制备了致密、高织构、疏水的非晶ZrO2-TiO2(1:1)涂层。采用了有机和无机锆前驱盐。本研究以氯离子为腐蚀活化剂,对其在特定腐蚀介质中的保护能力进行了研究。失重法和动电位极化曲线均证明了涂层具有良好的防腐性能。采用x射线衍射(XRD)、原子力显微镜(AFM)、接触角测量、红外光谱(IRS)、扫描电镜(SEM)、差热分析(DTA-TG)和x射线光电子能谱(XPS)对样品进行了表征。结果表明,处理温度(Ttr)和锆前驱体类型等因素的影响程度是不同的。在400°C下处理的样品(分别为A4和B4)的PD曲线表明,由于有机Zr盐的应用导致阳极钝化区恶化,前驱体的影响比Ttr更大。与此相反,当Ttr = 500℃时,由有机和无机Zr前驱盐制备的涂层具有相似的腐蚀效率,即前驱盐的影响最小。所有涂层均无明显的腐蚀损伤。非晶致密结构、表面光滑性、疏水性和表面化学成分(低羟基含量)等复杂的结构和表面参数是复合膜防腐性能提高的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Surface Morphological and Chemical Features of Anticorrosion ZrO2–TiO2 Coatings: Impact of Zirconium Precursor
Dense, highly textured, hydrophobic ZrO2-TiO2 (1:1) coatings with amorphous structure were prepared using the sol-gel method. Both organic and inorganic zirconium precursor salts were used. The present study dealt with the investigation of their protective ability in a selected model corrosive medium with chloride ions as corrosion activators. The coatings showed good anticorrosion performance during the test, which was demonstrated both by the weight loss method and potentiodynamic polarization curves. The samples were characterized by means of X-ray diffraction (XRD), Atomic Force Microscopy (AFM), contact angle measurements, Infrared spectroscopy (IRS), Scanning Electron Microscopy (SEM), Differential Thermal analysis (DTA-TG) and X-ray photoelectron spectroscopy (XPS). It was established that the extent of influence of some factors, like treatment temperature (Ttr) and type of zirconium precursor, was different. The PD curves of samples treated at 400 °C (A4 and B4, respectively) demonstrated an increased effect of the precursor in comparison to Ttr, since the application of organic Zr salt led to deterioration of the anodic passivation zones. Contrary to this, the coatings obtained from both the organic and inorganic Zr precursor salts with Ttr = 500 °C had similar corrosion efficiency, i.e., the influence of the precursor was minimized. All investigated coatings had no visible corrosion damage. It seems that some complex structural and surface parameters, such as amorphous dense structure, surface smoothness, hydrophobicity and the surface chemical composition (low hydroxyl groups content), were responsible for the increased anticorrosion properties of the composite films.
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