磁场作用下十二烷基苯磺酸钠对阳极铝箔的缓蚀性能及比电容的影响

Effect of SDBS Coupled with Magnetic Field on Corrosion Inhibition Performance and Specific Capacitance of Anodic Aluminum Foil

以十二烷基苯磺酸钠(SDBS)为缓蚀剂,通过在扩面增容过程中引入磁场,系统研究了磁致涡流(MHD,Magnetohydrodynamics)效应对腐蚀箔缓蚀性能及比电容的影响规律。通过XRD、扫描电镜(SEM)、EDS、Tafel极化曲线以及交流阻抗曲线等手段对腐蚀箔的表面晶相、表面/截面形貌、S元素分布以及耐蚀性能进行研究。结果表明,MHD效应提高了电解液中DBS-、NO3-向箔面及孔内的传质速率,腐蚀箔表面SDBS吸附量及分布均一性提高,腐蚀箔失重降低,耐蚀性能增强;同时蚀孔内NO3-含量增加,平均蚀孔长度及比表面积增大。对应的腐蚀箔缓蚀效率提高至62.36%,比电容增大至65.39μF·cm-2。与无MHD作用下制备的腐蚀箔相比,MHDT作用下所得腐蚀箔的缓释效率及比电容分别提高了15.10%和10.03%。

By introducing magnetic field into the extending surface area process,combined with SDBS as corrosion inhibitor,the effect of magnetohydrodynamics(MHD)on corrosion inhibition performance and specific capacitance of etched foils is studied in detail.The crystalline phase,the surface/cross-section morphology,distribution of S element and corrosion resistance quality of samples were characterized and analyzed by means of XRD,SEM,EDS,Tafel curve and EIS(electrochemical impedance spectra).The results show that MHD effect increases the mass transfer rate of DBS-/NO 3-to the etched foil surface/hole in electrolyte,the surface adsorption capacity and distribution uniformity of SDBS.Meanwhile,the NO 3-content in etched hole,the average hole depth and specific surface area are also obviously improved.The corrosion inhibition efficiency of the optimal foil sample increases up to 62.36%as well as the high specific capacitance 65.39μF·cm-2.Compared to the etched foil without MHD,its corrosion inhibition efficiency increases by 15.10%,accompanying by 10.03% increment of specific capacitance.