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URN etd-0810108-142319 Statistics This thesis had been viewed 2743 times. Download 1284 times. Author Hao-Bang Ho Author's Email Address No Public. Department Chemical Engineering Year 2007 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 88 Title ELECTROLYTIC COLORING AFTER THE SECOND ANODIC TREATMENT OF ALUMINUM IN SULFURIC ACID SOLUTION WITH THE ADDITION OF 5-SULFOSALICYLIC ACID Keyword electrolytic coloring two-step anodic treatment addition of 5-sulfosalicylic acid addition of 5-sulfosalicylic acid two-step anodic treatment electrolytic coloring Abstract This study was carried out by means of the method of two-step anodic treatment in the sulfuric acid solution with the addition of 5-sulfosalicylic acid and then electrolytic coloring in cupric sulfate solution，it is expected that by adding 5-sulfosalicylic acid and technique of two-step anodic treatment, 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.
It is found that at the coloring after the anodic treatment by adding 5-ssa, the thickness of the anodized colored film would become thinner than that without the addition，but it would become thicker after two-step anodic treatment by adding 5-ssa. And，the hardness of anodic film from the addition of 5-ssa is larger than that without the addition, but it would become lower after two-step anodic treatment by adding 5-ssa. From SEM、 AFM and corrosion test of the anodic film after two-step anodic treatment by adding 5-ssa,it found out that the anodic film is more regular, smoother and denser, so it has the lowest △E after the coloring. It proves that more cupric ions deposit in the anodic film after two-step anodic treatment by adding 5-ssa.
At the anodic current density of 2 A/dm2 and the duration time of 20 minutes after two-step anodic treatment by adding 5-ssa, the best operating conditions of electrolytic coloring are：alternating current voltage：30V, and electrolytic coloring time：40 minutes, hence, the lowest △E value is 7.41. The average reflectivity, gloss, film thickness, hardness and corrosion rate are respectively 4.50%、8.6、10.2μm、591Hv and 3.1875E-9 Amp/cm2.
Advisor Committee Hsing-Hsiang Shih - advisor
Mu-Rong Yang - co-chair
Shyankay Jou - co-chair
Files Date of Defense 2008-07-31 Date of Submission 2008-08-12