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The defense date of the thesis is 2009-08-10
The current date is 2019-08-25
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URN etd-0810109-122151 Statistics This thesis had been viewed 1545 times. Download 26 times. Author Yi-Chih Chen Author's Email Address No Public. Department Chemical Engineering Year 2008 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 103 Title ELECTROLYTIC COLORING IN CuSO4/AgNO3 AFTER THE SECOND ANODIZATION OF ALUMINUM IN MIXED ACID SOLUTION Keyword anodization electrolytic coloring electrolytic coloring anodization Abstract In this research, using twice anodization on aluminum and adding citric acid in an anodizing electrolyte simultaneously is the purpose to obtain a better pore structure than the process of once anodization. And the best operating conditions to obtain a blacker anodic film using electrolytic coloring solution of CuSO4 or AgNO3 had been found out.
The experimental results show that, the larger and more orderly pores structure after the second anodization are obtained. Using the second anodization brfore the process of electrolytic coloring has many benefits to the properties of the colored film than using the first anodization, like film thickness, chromatism, reflectivity and anticorrosion. Electrolytic coloring in AgNO3 solution has the advantage of short reaction time and lower operating voltage to obtain blacker film than coloring in CuSO4 solution.
The best operating conditions to obtain the blackest film are：the second anodizing current density of 2A/dm2 , the electrolytic coloring voltage of 25V in CuSO4 and coloring time of 30 min, it has a △E* value of 8.39; For the electrolytic coloring solution in AgNO3, the coloring voltage of 25V and coloring time of 20 min are the best operating conditions to obtain the blackest film with △E* value of 7.76.
Advisor Committee Hsing-Hsiang Shih - advisor
Mu-Rong Yang - co-chair
Shyan-kay Jou - co-chair
Files Date of Defense 2009-07-30 Date of Submission 2009-08-10