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The defense date of the thesis is 2014-07-28
The current date is 2019-03-21
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URN etd-0728114-105845 Statistics This thesis had been viewed 803 times. Download 0 times. Author Yao-Hsiang Hu Author's Email Address No Public. Department Chemical Engineering Year 2013 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 93 Title THE EFFECT OF ELECTROPOLISHING ON THE ANODIC FILM AND ITS ELECTROLYTIC COLORING FROM A SECONDARY ANODIC PROCESS Keyword electropolishing electrolytic coloring secondary anodic secondary anodic electrolytic coloring electropolishing Abstract The study was carried out by means of the method of electropolishing on the anodic films before secondary anodic treatment and then electrolytic coloring in cupric sulfate solution. It is expected that by this method a dense and regular oxidizing film on aluminum can be obtained and that the optimum operating conditions for obtaining a blackest film are found out.
The experimental results show that electropolishing on the anodic films increase the size of pores and more regular, the secondary anodic treatment can also increase the size and the number of pores, after electropolishing and secondary anodic treatment on aluminum sheets make the thickness of the anodic colored film become thicker. From SEM and AFM we found the pores are larger and more than anodic treatment, secondary anodic treatment, and anodic treatment after electropolishing, also has a good effect for electrolytic coloring. We get the lowest ΔΕ*and reflectivity after coloring, but the hardness of the anodic colored film become lower.
The optimal operating conditions for obtaining the blackest colored
film are: electropolishing voltage 10Vdc, electropolishing time 30 min in phosphoric acid and ethanol, secondary anodic treatment current 2A/dm2, secondary anodic treatment time 30 min, electrolytic coloring voltage 20 Vac and electrolytic coloring time 120 minutes, the lower △E value, and reflectivity would be obtained. Those values are respectively 9.96 and 5.4%.
Advisor Committee Hsing-Hsiang Shih - advisor
Li-Tang Teng - co-chair
ShyanKay Jou - co-chair
Files Date of Defense 2014-07-22 Date of Submission 2014-07-28