摘要
使用铝合金在硼．硫酸．草酸电解液中阳极氧化制备有序多孔层。初步探讨了恒流和降压阳极氧化过程膜层生长机理，采用扫描电镜（SEM）观察膜层微观形貌，结合电化学阻抗和动电位极化曲线研究不同阳极化工艺制备膜层试样在3．5％NaCl溶液中的耐蚀行为。结果表明，采用三段变压方式制备的阳极氧化膜表面孔密度降低，孔壁增厚，孔径为10～13am。疏孔膜层的电化学行为表明孔壁及膜层厚度增大能提高试样电荷传递电阻和耐蚀性能。
A well ordered porous oxide film on aluminum alloy was prepared by a three-stage pro- cess in electrolyte of boric-sulfuric-oxalic acids. The relevant growth mechanism of oxide film in the processes with modes of galvanostatic and reduced voltage was elaborated. The morphology and microstructure of the oxide films were characterized by scanning electronic microscopy （SEM）. The corrosion performance of the films in 3.5%NaC1 solution was examined by electro- chemical impedance spectroscopy and potentiodynamic polarization curves. The results show that the anodic film exhibits to be regular and dense with pore diameter of 10-13 nm. Moreover, the electrochemical behavior of anodic oxide film could be described as that the impedance and corro- sion resistance was increased with the increasing thickness of the film and the cell wall.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2014年第2期154-158,共5页
Corrosion Science and Protection Technology
关键词
2024铝合金
阳极氧化
降压
耐蚀性
2024 aluminum alloy, anodizing, voltage decrease, corrosion resistance
