CAJ | 학술논문

通过AFM、交流阻抗谱及扫描Kelvin探针技术,研究硼酸对7050铝合金硼酸-硫酸阳极氧化膜结构及耐蚀性的影响.结果表明,在硼酸-硫酸阳极氧化体系中,硼酸不会改变氧化膜阻挡层的结构,但会显著影响氧化膜多孔层的结构形式,进而影响氧化膜的耐蚀性.在0～8 g/L的范围内,随着电解液中硼酸含量的增加,氧化膜的多孔层电阻增大,电容减小,表面势正移,孔径缩小,耐蚀性变好.在高于8gL时,随着硼酸含量的增加,氧化膜的孔隙变大,阻抗变小,电子逸出功降低,耐蚀性变差.
통과AFM、교류조항보급소묘Kelvin탐침기술,연구붕산대7050려합금붕산-류산양겁양화막결구급내식성적영향.결과표명,재붕산-류산양겁양화체계중,붕산불회개변양화막조당층적결구,단회현저영향양화막다공층적결구형식,진이영향양화막적내식성.재0～8 g/L적범위내,수착전해액중붕산함량적증가,양화막적다공층전조증대,전용감소,표면세정이,공경축소,내식성변호.재고우8gL시,수착붕산함량적증가,양화막적공극변대,조항변소,전자일출공강저,내식성변차.
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.