Preparation And Study Of Waterborne Acrylate Composite Anticorrosive Coatings

Corrosion of metals jeopardizes various fields,and the application of anticorrosive coatings is the most effective method.With the development of science and technology and society,the concept of environmental protection is deeply rooted in people's hearts,and water-based anticorrosive coatings have become the general trend.Water-based acrylate emulsion has the advantages of heat resistance,weather resistance,corrosion resistance,stain resistance and high coating mechanical properties,so it is widely used in water-based coatings.Graphite microchips?GNPs?have a lamellar structure,which can isolate the corrosive medium,and at the same time,it acts as a filler to play a special anticorrosive mechanism in the polymer matrix.In this study,GNPs were used as fillers to further optimize the anticorrosive performance of traditional water-based acrylate composite anticorrosive coatings.A composite anticorrosive coating was prepared by doping with iron oxide filler,and the corrosion resistance of the paint film was analyzed.When the amount of iron oxide is 30 wt.%,The corrosion resistance of the iron oxide/water-based acrylate composite anticorrosive paint film is good,the salt spray resistance time is 60 hours,the corrosion potential is-0.659 V,and the corrosion current is 2.3561E^-5 A/cm²,Iron oxide as a commonly used filler has the effect of insulating inorganic particles,so as to hinder the corrosive medium and improve the corrosion resistance of the paint film.In order to optimize the filler and performance of common filler acrylate anticorrosive coatings,compound anticorrosive coatings were prepared by doping different amounts of GNPs.Due to the dual effects of physical isolation mechanism and electrochemical corrosion protection mechanism of GNPs,its composite anticorrosive coating has excellent corrosion resistance.When the amount of GNPs is 3.6 wt.%,The salt spray resistance time is 240 h;the maximum corrosion potential of the paint film is-0.68 V,and the minimum corrosion current is 2.61E^-5 A/cm².Using silane coupling agent?ATPES?to modify GNPs to obtain modified graphite microchips?f-GNPs?,with less f-GNPs the corrosion resistance is improved.When the doping amount of f-GNPs is 2.8 wt.%,The dispersion effect is better;the salt spray resistance time is 600 hours,compared with the addition of unmodified GNPs,the salt spray resistance time is increased to 2.5 times;the corrosion potential reaches-0.66 V,the corrosion current is an order of magnitude lower,1.09E^-6 A/cm².The GNPs modified by the coupling agent can show good dispersibility and interfacial adhesion in the polymer,and the anticorrosive performance of the paint film has been significantly improved.