The Study of Electro-oxidation Process Parameters on the Titanium Coating Properties
Date Issued
2014
Date
2014
Author(s)
Lin, Zhe-Wei
Abstract
It’s compared the qualities of the titanium oxide layer modified by electro-oxidation under different process conditions, they were comapared with applied voltage, acting time, and duty ratio of voltage pulse. From obeservating the surface color, surface topography of SEM, surface roughness, microhardness, elemental composition analysis of EDX,it is shown impact of the different process conditions to the qualities of titanium oxide layer. Moreover, it can be demonstrated the optimization conditions to generate the titanium oxide layer by electro-oxidation. The experiments are divided into the two parts. In the first part, it was designed to the five duty ratio conditions at the constant voltage 350V，and four acting time 10、30、60、90s as the acting time were chosen to observe the film quality. The results show that generating the best ceramic oxide film at duty ratio is 50%., it has the most obvious characteristics of melting surface at duty ratio is 33% In second part, the good pulse conditions of film growth at different voltages. To determine the good pulse conditions, we pick the results of first experiment. Duty ratio were 99%、50%、33% at different voltage 100V and 600V, and the acting time is the same as first part. It was found that at 100 V, all duty ratio have no different in film. At 600V, all duty ratio can convert film to the ceramic oxide film, but when Duty ratio is 100%, it has bigger cavities and large height difference. Hence, it forms the most uniform surface of film and less cavities at Duty ratio of 50%. Therefore, all duty ratio have no significant effect on the growing influence of the film at low voltage or short acting time. However, the difference of duty ratio will gradually make the difference in surface of film at high voltage or long acting time. Eventually, electrolyte ions will melt into the surface of film at high voltage condition
Subjects
duty ratio
color
SEM
surface roughness
microhardness
Type
thesis
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