Abstract
Anodizing of aluminum in the electrolyte of alkaline solution was studied. This paper describes the relation between the anodizing conditions and thickness of oxide film, and the properties of the film.The following results were obtained:(1) In the anodizing of aluminum in alkaline solution, the thickness of anodic oxide film was, increased with the drop of bath temperature and it reached a maximum of 28μ at 1°C.(2) As long as brown smuts did not adhere to the surface, the thickness of oxide film was linearly increased with increasing current density and anodizing time.(3) It was shown by electron and optical microscopy that the cell size was larger than that of usual oxide films obtained from acid baths and a number of large pores appeared on the surface.(4) Anodic oxide films from alkaline baths passed CASS test for 70hrs, and showed a corrosion resistance of 20sec/μ by alkaline drop test.
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