Effect of graphene additive and current density on corrosion resistance of anodized coatings on aluminium-lithium alloys
Al-Li-Cu-Mg alloy was anodized in mixed acid electrolyte system to prepare oxide films with different current densities and graphene infiltration.The surface and cross-sectional morphology,elemental composition,and phase composition of the film layer under various parameters were analyzed using SEM,XRD,EDS and other analysis and testing methods.The corrosion resistance and other properties of the film layer were also analyzed using electrochemical workstations and other instru-ments.The influence mechanism of different current and graphene penetration on the film properties was studied.The experimental results show that an increase in current density will first increase and then decrease the thickness of the material film layer,increase defects,and increase and then decrease the corrosion resistance.The optimal current density for corrosion resistance of anodic oxide film is 15 A/dm2.At the same time,the inclusion of graphene will reduce the corrosion resistance of the film,and the corrosion current density of the anodized film is 4.898×10-7 A·cm-2.
万方数据
维普
