Revealing the Impact of Micro-SiO 2 Filer Content on the Anti-Corrosion Performance of Water-Borne Epoxy Resin.

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 2 content on the corrosion performance of a WBE coating, in which micron spherical SiO 2 particles were synthesized in a liquid phase reduction. The results showed that the synthesized micron spherical SiO 2 particles were about 800 ± 50 nm in diameter and in an amorphous state. By hydrophilizing the surfaces of these SiO 2 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 2 to a coating will not improve corrosion resistance and may even reduce corrosion resistance. With the appropriate modification of SiO 2 , corrosion resistance of composite coatings is greatly enhanced, as is the adhesion between the coatings and the metallic substrates. Because the appropriately modified SiO 2 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.