The microstructure and corrosion resistance of different boric/sulfuric acid anodic(BSAA) films on 7050 aluminum alloy were studied by atomic force microscopy(AFM),electrochemical impedance spectroscopy(EIS) and...The microstructure and corrosion resistance of different boric/sulfuric acid anodic(BSAA) films on 7050 aluminum alloy were studied by atomic force microscopy(AFM),electrochemical impedance spectroscopy(EIS) and scanning Kelvin probe(SKP).The results show that boric acid does not change the structure of barrier layer of anodic film,but will significantly affect the structure of porous layer,consequently affect the corrosion resistance of anodic film.As the content of boric acid in electrolyte increases from 0 to 8 g/L,the resistance of porous layer(Rp) of BSAA film increases,the capacitance of porous layer(CPEp) decreases,the surface potential moves positively,the pore size lessens,and the corrosion resistance improves.However,the Rp,CPEp and surface potential will change towards opposite direction when the content of boric acid is over 8 g/L.展开更多
The influence of adipic acid on the formation and corrosion resistance of anodic oxide film fabricated on 2024 aluminum alloy was investigated. The morphology was investigated by scanning electron microscopy (SEM) a...The influence of adipic acid on the formation and corrosion resistance of anodic oxide film fabricated on 2024 aluminum alloy was investigated. The morphology was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The corrosion resistance was evaluated by electrochemical impedance spectroscopy (EIS). The results showed that the adipic acid was absorbed at the electrolyte/anodic layer interface during anodizing. The corrosion rate of anodic film decreased and the film thickness increased. The film was uniform and compact especially at the film/substrate interface. After sealing procedure, anodic film formed with the addition of adipic acid exhibited improved dielectric property and corrosion resistance in aggressive environment.展开更多
文摘The microstructure and corrosion resistance of different boric/sulfuric acid anodic(BSAA) films on 7050 aluminum alloy were studied by atomic force microscopy(AFM),electrochemical impedance spectroscopy(EIS) and scanning Kelvin probe(SKP).The results show that boric acid does not change the structure of barrier layer of anodic film,but will significantly affect the structure of porous layer,consequently affect the corrosion resistance of anodic film.As the content of boric acid in electrolyte increases from 0 to 8 g/L,the resistance of porous layer(Rp) of BSAA film increases,the capacitance of porous layer(CPEp) decreases,the surface potential moves positively,the pore size lessens,and the corrosion resistance improves.However,the Rp,CPEp and surface potential will change towards opposite direction when the content of boric acid is over 8 g/L.
基金Project(51271012)supported by the National Natural Science Foundation of China
文摘The influence of adipic acid on the formation and corrosion resistance of anodic oxide film fabricated on 2024 aluminum alloy was investigated. The morphology was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The corrosion resistance was evaluated by electrochemical impedance spectroscopy (EIS). The results showed that the adipic acid was absorbed at the electrolyte/anodic layer interface during anodizing. The corrosion rate of anodic film decreased and the film thickness increased. The film was uniform and compact especially at the film/substrate interface. After sealing procedure, anodic film formed with the addition of adipic acid exhibited improved dielectric property and corrosion resistance in aggressive environment.