摘要
用动电位极化法和扫描电镜研究了工业纯铝阳极氧化膜在NaCl溶液中的孔蚀行为 .结果表明 ,蚀孔的生长控制机制随蚀孔的发展而发生变化 ,蚀孔生长的初期为扩散控制 ,然后向欧姆控制发展 ,在蚀孔生长的后期阶段又转为扩散控制 .对蚀孔的形貌观察发现 ,小孔贯穿阳极氧化膜以后优先在基体中生长 ,形成“半球型”的蚀孔形貌 ,阳极氧化膜大部分保留在蚀孔上方形成“膜盖” ,膜盖上只有一个直径很小的小孔作为蚀孔生长的扩散通道 .讨论了蚀孔的生长机制 .
Pitting behavior of anodized aluminum in NaCl solution was studied using methods of potentiodynamic polarization and SEM.The results show that the controlling mechanism for pitting changes with development of the pit.The early stage and last stage of pit growth are controlled by diffusion,while the middle stage is controlled by ohmic action.Once a pit penetrates the anodic film,it preferentially propagates in the aluminum matrix,and hemispherical pit with a film cover above is formed.Only a small pit is present on the film cover as the diffusion channel for pit development.The growth mechanism of pitting was discussed.
出处
《中国腐蚀与防护学报》
CAS
CSCD
2003年第4期198-201,共4页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金 (5 99710 0 5 )
国家重点基础研究发展规划 (G19990 6 5 0 )资助项目
关键词
铝阳极氧化膜
孔蚀
生长机制
anodic aluminium film,pitting,growing mechanism
