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URN etd-0818105-155243 Statistics This thesis had been viewed 4441 times. Download 2346 times. Author Chung-Chen Chen Author's Email Address No Public. Department Materials Engineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 71 Title THE INFLUENCE OF GRAIN SIZE AND ANODIZING ON PROPERTIES OF BLACK COLORED FILM OF AN AA6061 ALUMINUM ALLOY Keyword grain size electrolytic coloring corrosion current density anodize anodize corrosion current density electrolytic coloring grain size Abstract The effect of grain size on the optical property and corrosion behavior of an anodic oxide film has been studied. Al specimens grain sizes were refined from 2±0.5mm to 20±3μm by thermal heat treatment. Specimens were subsequently anodized in a sulfuric acid solution using pulsed current and black colored in a solution containing cupric salt. The hardness of anodized film anodized at current density 1.5 A/dm2-60mins and 5 A/dm2-7mins were 348±18(HV5g) and 455±15(HV5g). Of the same film thickness (11μm), the anodic oxide film obtained at 1.5 A/dm2 current density showed lower reflectivity and CIE L value than film anodized at 5 A/dm2. The aluminum plates were anodized at current density 1.5 A/dm2 or 5 A/dm2, the obtained film thickness are 11±1μm or 22±2μm and enforce coloring time are 15 or 25minute. Aluminum of 20±3μm grain size showed more benefit on black coloring treatment. The corrosion current density of aluminum sheet was decreased 46% after black coloring. However the anodic oxide film after the sealing treatment has a obvious decreasing effect of corrosion current density about 62~78 %. Advisor Committee Liu-Ho Chiu - advisor
Fan-Shiong Chen - co-chair
Heng-Chang - co-chair
Hsing-Hsiang Shih - co-chair
Files Date of Defense 2005-07-06 Date of Submission 2005-08-18