Anodizing Treatment of Al-Mg Alloys.

• Main Authors: Chih-Wei Liu, 劉志維
• Other Authors: Teng-Shih Shih
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/00792447847166481497

碩士 === 國立中央大學 === 機械工程研究所 === 90 === The purpose of this study is aimed at investigating effects of coating thickness, and composition on CIE L*a*b value by different anodizing condition. The alloy used in this experiment was 5050 H32 Aluminum alloy, and the electrolyte used was dilute sulfuric acid. All experiments conducted by using constant current density. Experimental variables studied including anodizing time, current density, concentration of sulfuric acid, and adding potassium tartaric in the dilute sulfuric acid. The coating thickness and the coating elements were measured by the coating thickness tester, electron probe X-ray microanalyzer(EPMA) and the spectrophotometer. Increasing the anodizing time, current density and decreasing the concentration of sulfuric acid, increase the thickness of anodic film. Adding the potassium tartaric increases the thickness of the anodic film, too. The compositions of the anodic film were influence by the migration of the ion and the microcrystalline structure in the anodic film.