Greatly enhanced corrosion/wear resistances of epoxy coating for Mg alloy through a synergistic effect between functionalized graphene and insulated blocking layer  

作　　者：Z.Y.Xue X.J.Li J.H.Chu M.M.Li D.N.Zou L.B.Tong 

机构地区：[1]School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China [2]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China

出　　处：《Journal of Magnesium and Alloys》2024年第1期332-344,共13页镁合金学报（英文）

基　　金：the National Natural Science Foundation of China(Grant number 51771178);Shaanxi Outstanding Youth Fund project(Grant number 2021JC-45);Key international cooperation projects in Shaanxi Province(Grant number 2020KWZ-007);the Major Program of Science and Technology in Shaanxi Province(Grant number20191102006);Open Fund of State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body(Grant number 32115019)。

摘　　要：The poor corrosion and wear resistances of Mg alloys seriously limit their potential applications in various industries.The conventional epoxy coating easily forms many intrinsic defects during the solidification process,which cannot provide sufficient protection.In the current study,we design a double-layer epoxy composite coating on Mg alloy with enhanced anti-corrosion/wear properties,via the spin-assisted assembly technique.The outer layer is functionalized graphene(FG)in waterborne epoxy resin(WEP)and the inner layer is Ce-based conversion(Ce)film.The FG sheets can be homogeneously dispersed within the epoxy matrix to fill the intrinsic defects and improve the barrier capability.The Ce film connects the outer layer with the substrate,showing the transition effect.The corrosion rate of Ce/WEP/FG composite coating is 2131 times lower than that of bare Mg alloy,and the wear rate is decreased by~90%.The improved corrosion resistance is attributed to the labyrinth effect(hindering the penetration of corrosive medium)and the obstruction of galvanic coupling behavior.The synergistic effect derived from the FG sheet and blocking layer exhibits great potential in realizing the improvement of multi-functional integration,which will open up a new avenue for the development of novel composite protection coatings of Mg alloys.

关 键 词：Mg alloy Functionalized graphene Epoxy coating Corrosion/wear resistance Blocking layer 

分 类 号：TG174.4[金属学及工艺—金属表面处理]