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首页> 外文期刊>Journal of Materials Engineering and Performance >Characterization of SiO2-TiO2 Hybrid Corrosion Protective Coatings on Mild Steel
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Characterization of SiO2-TiO2 Hybrid Corrosion Protective Coatings on Mild Steel

机译：低碳钢上SiO2-TiO2杂化防腐涂层的表征

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Organic-inorganic SiO2-TiO2 sol-gel coatings were prepared and applied on a mild steel substrate using dip coating technique and subsequently heat treated at 200 and 300 A degrees C to improve the corrosion resistance. The coating sols were synthesized using Glycidoxytrimethoxysilane and titanium tetraisopropoxide as precursor materials. The corrosion resistances of the both coated and uncoated samples were evaluated by the Tafel polarization and electrochemical impedance spectroscopy in NaCl solution. The microstructure of coated specimens was characterized by scanning electron microscopy. Fourier transformed infrared and energy dispersive spectroscopy analyses were used to identify the presence of various functional groups in the coating solutions. A comparison of the corrosion resistance of the coated and uncoated mild steel was presented. i (corr) values of coated specimens heat treated at 200 A degrees C were between 6.9 and 9.2 times smaller than those of uncoated specimen. In the case of coated specimens heat treated at 300 A degrees C, i (corr) values were 4.4 and 5 times smaller than those of uncoated specimen. The coating film was noted to be smooth and between 7.2- and 7.5-A mu m thick. The measured electrochemical parameters indicated that the corrosion resistance was improved by the coating film. The elasticity of the coating can be improved by the presence of organic groups in the coating which reduces stress and crack formations during sintering. Ultimately, crack-free and elastic coating was obtained by heat treating of organic-inorganic coating at as low as 200 A degrees C.
机译：制备有机-无机SiO2-TiO2溶胶-凝胶涂层，并使用浸涂技术将其涂覆在低碳钢基材上，然后在200和300 A的温度下进行热处理以提高耐腐蚀性。使用缩水甘油三甲氧基硅烷和四异丙氧基钛作为前体材料合成了涂料溶胶。涂层样品和未涂层样品的耐蚀性均通过Tafel极化和电化学阻抗谱在NaCl溶液中进行评估。涂层样品的微观结构通过扫描电子显微镜表征。傅里叶变换红外和能量色散光谱分析用于确定涂料溶液中各种官能团的存在。提出了涂层和未涂层​​低碳钢的耐腐蚀性的比较。在200 A的温度下进行热处理的涂层试样的i（corr）值比未涂层试样的i（corr）值小6.9至9.2倍。对于经涂层的样品，在300 A的温度下进行热处理，其i（corr）值比未涂层的样品小4.4到5倍。注意到涂膜是光滑的，厚度在7.2-7.5-μm之间。测得的电化学参数表明，涂膜改善了耐腐蚀性。涂层的弹性可以通过涂层中有机基团的存在来改善，这可以减少烧结过程中的应力和裂纹的形成。最终，通过在低至200 A的温度下对有机-无机涂层进行热处理，获得了无裂纹和弹性的涂层。

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