Preparation And Research Of Metal Anticorrosion Coating Based On Modified Graphene Oxide

With the wide application of metal,its own corrosion problem has become an urgent link to be solved.The general methods include mixing inactive elements,adding corrosion inhibitors,and coating diaphragm.The coating barrier method is the most widely used and the corrosion resistance is the best,so the main content of this paper is to prepare a metal with excellent anticorrosion performance.The specific process is as follows:First,we use epoxy resin E44 as matrix resin,and then,according to laboratory conditions,select three room temperature curing agents,which are low molecular polyamide,ethylenediamine,methyl cyclopentylamine.Next,we calculate the theoretical addition amount.On this basis,the curing agent is selected according to the single factor test method,and the optimum ratio of resin and curing agent is determined.here,the mechanical properties of the films are mainly used as the evaluation criteria,and electrochemical performance as auxiliary.The final curing agent we chose was low molecular polyamide 651,and the optimum ratio of epoxy resin to it was 10:3.5.After finishing the basic work,we study how to improve the performance of the film.Considering that graphene oxide has good barrier shielding properties,some studies have also shown that it can greatly promote the anti-corrosion performance of the film,however,its self-aggregating properties and incompatibility with resin,which limits the function to some extent.Therefore,we made graphene oxide by hummers method,and tried a new modification method,that is,to make nano-TiO2 graft with graphene oxide with the help of IPTMS.The self-made graphene oxide and modified TiO2-GO were characterized by FTIR,XRD,XPS,SEM,TGA and dispersion test.Subsequently,we added it to the epoxy resin,and determined the optimum ratio of epoxy resin to it by single factor method as well.The result is 10:0.15.The above experimental results show that the performance of the film is improved by adding TiO2-GO,however,it does not meet the application requirements,so we consider adding several common functional fillers,including composite zinc phosphate,mica iron oxide,silica to cooperate with the TiO2-GO,which can not only make the film denser,but also play a synergistic role between the fillers with different properties,and further promote the properties of the film.Owing to there are many influencing factors,we finally decided to use orthogonal test method to determine the best formula of the film.first,we also determined the optimal ratio of three functional fillers by single factor method,that is,the optimum ratio of epoxy resin to composite zinc phosphate is 10:3;with mica iron oxide is 10:7;with silica is 10:5.And then according to the number of influencing factors,the L9(34)orthogonal test table is selected,and the corresponding level is determined near the best addition amount of each factor,and the test is carried out.Finally,the formulation of the film was determined as TiO2-GO addition amount of 0.15 g,composite zinc phosphate 2 g,mica iron oxide 5g and silica 4g.The results showed that the film under the formula had the best anticorrosion effect.After soaking in 3.5%NaCI for 30 days,the resistance value of the low frequency region remained at 1011?·cm2.Compared with the varnish,it had nearly 4 orders of magnitude improvement,and its mechanical properties were also good.In summary,this project not only successfully prepared a functional modified graphene oxide,but also mixed it with several other fillers to prepare a metal anticorrosive coating with excellent anticorrosion performance.