The effect of aluminum heat treatment on the growth of aluminum oxide film

• Main Authors: Kuo-yu Yeh, 葉國裕
• Other Authors: Hsing-Hsiang Shih
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/17782731386474850411

碩士 === 大同大學 === 化學工程學系(所) === 93 === This research is to investigate the surface conditions and mechanical properties of the oxidized films of the aluminum materials after annealing then anodized in an electrolyte containing sulfuric acid, expecting that by taking the advantages of heat treatment, better aluminum oxide layer can be obtained. From the results, it was discovered that after the annealing treatment at given temperature, because of the rearrangement of the surface crystalline structure, the growth produce of the film can be accelerated and the growth condition of the surface can be improved. From the analysis of X-ray diffraction, it is known that the crystalline produced after the heat treatment is ��-Al2O3; ��-Al2O3 would produce effect on both the density and hardness of the aluminum oxide film, and would slow down the dissolution rate of the film. In addition, it is found that after the preimmersing treatment with ammonium molybdate, because of the adjustment of the properties of crystalline structure of annealing treatment, the inhibition of the molybdic oxyhydroxide film is decreased, and the growth of the aluminum oxide film is promoted, causing the film thickness to be improved.