Fan Bifeng, Yang Junjie, Cao Lin, Wang Xiao, Li Jie, Yang Yingfei, Wang Qiwei, Zhang Peng, Vogel Florin, Li Wei, Lin Zhidan
Institute of Advanced Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangzhou 510632, China.
Polymers (Basel). 2023 Aug 2;15(15):3273. doi: 10.3390/polym15153273.
Due to green development in recent years, water-borne epoxy resins (WBE) have become increasingly popular since they generate the lowest level of volatile organic compounds (VOC) during curing. However, because of the large surface tension of water, it is easy to produce voids and cracks during the curing process of the coating. An electrochemical strategy was used in this study to assess the impact of different SiO content on the corrosion performance of a WBE coating, in which micron spherical SiO particles were synthesized in a liquid phase reduction. The results showed that the synthesized micron spherical SiO particles were about 800 ± 50 nm in diameter and in an amorphous state. By hydrophilizing the surfaces of these SiO particles, uniform dispersion in an aqueous solvent and a WBE can be achieved. It is important to note that adding a small or excessive amount of SiO to a coating will not improve corrosion resistance and may even reduce corrosion resistance. With the appropriate modification of SiO, corrosion resistance of composite coatings is greatly enhanced, as is the adhesion between the coatings and the metallic substrates. Because the appropriately modified SiO can effectively fill the pores that are formed during the curing process, a corrosive medium is less likely to react with the matrix when the medium comes into contact with the matrix. Based on their incorporation content of 3 wt.%, their corrosion resistance is the best after 16 cycles of AC-DC-AC accelerated corrosion tests.
由于近年来的绿色发展，水性环氧树脂（WBE）越来越受欢迎，因为它们在固化过程中产生的挥发性有机化合物（VOC）水平最低。然而，由于水的表面张力大，在涂层固化过程中容易产生气孔和裂纹。本研究采用电化学策略评估不同SiO含量对WBE涂层腐蚀性能的影响，其中通过液相还原合成了微米级球形SiO颗粒。结果表明，合成的微米级球形SiO颗粒直径约为800±50nm，呈非晶态。通过对这些SiO颗粒的表面进行亲水化处理，可以使其在水性溶剂和WBE中实现均匀分散。需要注意的是，向涂层中添加少量或过量的SiO都不会提高耐腐蚀性，甚至可能降低耐腐蚀性。通过对SiO进行适当改性，复合涂层的耐腐蚀性和涂层与金属基材之间的附着力都得到了极大提高。因为适当改性的SiO可以有效填充固化过程中形成的孔隙，当腐蚀介质与基体接触时，腐蚀介质与基体发生反应的可能性较小。基于其3wt.%的掺入量，在进行16次交直流-交流加速腐蚀试验后，其耐腐蚀性最佳。
