Preparation and Deterioration Performance of Enamel Protective Coatings by Wet Chemical Method
BU Jinchao1, TANG Zhonghua2, XU Kai2, HE Caibing3, WANG Minjia1,*
1 School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China 2 Zhejiang Linjin Expressway Co., Ltd., Hangzhou 310024, China 3 Zhejiang Yuyou New Material Technology Co., Ltd., Hangzhou 310051, China
Abstract: Protective coating is an important material to improve the durability of outdoor engineering structures. In this work, an enamel coating was prepared by wet chemical method in nitrogen atmosphere, and the phase structure and micromorphology of the coating were studied in depth through XRD, FTIR, SEM, EDS, etc. At the same time, the changes in morphology, microstructure, pencil hardness, adhesion, gloss and thickness of the coating were tested before and after freeze-thaw cycles, xenon lamp and UV deterioration. The results show that the microstructure of the coating is a silicone-inorganic silicon composite network structure. The inorganic phases form dense crosslinks through organic groups and intermolecular coordination bonds. Among the inorganic phases, TiO can be formed through a high-energy mechanochemical reaction between fine Ti and TiO2 powders under a reducing atmosphere, which exhibits exceptional corrosion-resistant. NaAlO2 and Al2O3 can shield the photocatalytic activity of TiO2 from deteriorating its own durability by coating on the surface of unreacted TiO2. Therefore, the enamel coating remains almost unchanged after freeze-thaw cycles and xenon lamp irradiation. The pencil hardness of the enamel coating is 8H, and the adhesion is level 1. The gloss at 60° angle is 64.5GU, and the loss rate after UV radiation is 1.7%. Among all the deterioration processes, UV radiation can weaken the adhesion, increase the pencil hardness, and significantly reduce the thickness of the coating. Because the high energy of ultra-violet photons can promote the crosslinking reaction of active SiO2 to generate silicone, which makes the internal structure of the coating denser. It can also break bonds to generate CH2 groups, so as to weaken the bond between the substrate and coating. The research can provide support for the development of protective coatings on the surface of engineering structures.
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2024, Vol. 38 
