Fabrication And Study On Properties Of Nano CeO₂/Epoxy Anticorrosive Composite Coatings

Applying an organic coating to a metal surface is a method that is both economical and effective in slowing or preventing metal corrosion,such as epoxy coatings.However,epoxy resin has many disadvantages,such as brittle,internal easy to produce hole defects,and these disadvantages greatly limit the application.Therefore,the modification of epoxy coatings and the development of high-performance long-lasting anti-corrosion coatings have been the focus of research in recent years.In this paper,different rare earth oxides with different morphologies were used to prepare functional rare earth oxide composite particles with multi-stage structure and as a filler.A new epoxy resin coating with excellent anti-corrosion performance and strong mechanical properties was prepared by simple spraying method.The main content of the paper can be summarized as follows:（1）Two kinds of nano-cerium oxide particles,cerium oxide nanospheres and cerium oxide nanorods,were used as raw materials,and two kinds of nanoparticles were modified by silane coupling agent KH560,and then added to silicone epoxy resin.The anti-corrosion and wear-resistant coating with stable performance was prepared by spraying method.The influence of the morphology of cerium oxide nanoparticles on the anti-corrosion and anti-friction properties of epoxy coating was investigated.The experimental results show that the two morphologies of nano-cerium oxide improve the corrosion resistance of the epoxy coating,and the optimum addition amount is 3 wt.%.It is mainly due to the synergistic effect of Ce³⁺and WO₄^2-on corrosion inhibition.Epoxy coating with the addition of cerium oxide nanorods is superior to the cerium oxide nanospheres in the anti-corrosion and anti-wear effect of the epoxy coating.（2）Using the hydrothermal method,composite particles of cerium oxide/nickel tungstate with different mass ratios of binary structure were prepared,and modified by KH560 and added to epoxy resin to prepare epoxy composite with anti-corrosion and wear resistance.coating.The results show that the epoxy composite coating has the best anti-corrosion and wear resistance when the mass ratio of cerium oxide to nickel tungstate is 4:3 under the condition of 3.5 wt.%NaCl aqueous solution soaking.The coating is still maintains a high impedance modulus（7.36×10⁸Ω/cm²）in the late stage of soaking（45 days）,an order of magnitude higher than that of a pure epoxy coating.At the same time,after 10,000 rpm friction wear,the mass loss of the composite coating is 56%lower than that of the pure epoxy coating,and the thickness loss is only 50%of the ruthenium oxide epoxy coating.（3）Using glass flakes with large diameter-to-thickness ratio and excellent anti-permeability as raw materials,using dopamine（DA）which can provide a secondary reaction platform to compound glass flakes and cerium oxide nanorods to construct a new micro-nano cage"Structural glass flakes/cerium oxide nanorod composite particles,and secondary functional modification with KH560.The experimental results show that the coating resistance of the epoxy coating with 20 wt%glass flake/cerium oxide composite particles after immersion in 3.5 wt.%NaCl aqueous solution for 45 days is 10 times that of adding only the glass flake coating,and the impedance modulus remains stable.It exhibits excellent anti-corrosion performance,and its friction loss per unit time is 0.0934 g,which is only 41.3%of pure epoxy coating,showing good wear resistance.