Fabrication And Properties Of Amorphous (Graphene) Composite Coating For Catalytic Flue Gas Desulfurization Tower

The catalytic flue gas desulfurization tower has serious corrosion in the process of flue gas desulfurization,so it is an urgent engineering problem to develop a new anticorrosive coating to improve the service life of the flue gas desulfurization tower.The amorphous alloy has good corrosion resistance in various corrosive environments because of its unique structure.As a nano-scale laminar material,Graphene has good permeation resistance and water repellency,which could improve the corrosion performance of the coating.As the most economical and effective corrosion protection method,organic coating has been widely applied in various corrosive environments.Therefore,this paper proposes a new exploration of adding amorphous(graphene)to organic coating to improve the corrosion resistance of the catalytic flue gas desulfurization tower.In this paper,Fe-based amorphous(graphene)powder was used as filler and epoxy resin was used as film-forming material.Fe-based amorphous-epoxy coating and graphene-Fe-based amorphous epoxy coating were prepared by brush coating process,respectively.Not only the effects of the content of Fe-based amorphous powder and graphene on the structure and properties of the two coatings were investigated,but also the effect of coating thickness on the properties of the two coatings was studied.The results are as follows:(1)Preparation of coatings with different Fe-based amorphous content(0%,10%,20%,30%,wt.%).When the Fe-based amorphous content is 20%,the powder dispersion in the coating is the most uniform,the number of micropores in the coating is the least,and the corrosion resistance of the coating is the best.And the corrosion current density of the coating is 3.504E^-9A/cm²,the corrosion rate of the coating is 4.978E^-5mm/year.After soaking for 120h(60?,0.05mol/L H₂SO₄ solution),the weight gain of the coating is 0.1275g,the microhardness of the coating is 9.6HV,and the adhesion of the coating is grade 1.(2)Fe-based amorphous epoxy coatings with different thickness(100?300?m)were prepared when the amorphous content was 20%.When the thickness of the coating is 300?m,the corrosion resistance of the Fe-based amorphous epoxy coating is the best.And the corrosion current density of the coating is 1.895E^-10A/cm²,the corrosion rate of the coating is 2.209E^-6mm/year.After soaking for 120h(60?,0.05mol/L H₂SO₄ solution),the weight gain of the coating is 0.0978g,the microhardness of the coating is 9.2HV,and the adhesion of the coating is grade 1.(3)In order to further improve the corrosion resistance of iron based amorphous epoxy coating.Preparation of graphene-Fe-based amorphous epoxy coatings with different graphene content(0.4%,1%,2%,wt.%).When the graphene content is 1%,the distribution of graphene in the coating is the most uniform,and the number of micropores in the coating is the least,and the corrosion resistance is best.At this point,its corrosion current density is the smallest,which is 7.231E^-10A/cm²,the corrosion rate of the coating is 3.612E^-6mm/year.After soaking for 120 h(60?,0.05mol/L H₂SO₄ solution),the weight gain of the coating is the smallest,which is 0.0585g.The microhardness of the coating is12.8HV and the adhesion is grade 0.(4)Coatings with different thickness(100?300?m)were prepared when the graphene content was 1%and the amorphous content was 20%.When the coating thickness is 300?m,the coating has the best corrosion resistance,and its corrosion current density is 3.166E^-10A/cm²,the corrosion rate of the coating is 1.731E^-6mm/year.After soaking for 120h(60?,0.05mol/L H₂SO₄ solution),the weight gain of the coating was 0.0521g.The microhardness of the coating is 11.9HV,and the adhesion is grade 0.