| Summary: | 碩士 === 清雲科技大學 === 機械工程研究所 === 96 === This research is to evaluate the effect of both electroless NiP after annealed process and DLC thin film on the wear corrosion properties of aluminum magnesium media plank, giving the anneal process with different temperature (230℃~280℃, 15min). The aluminum media plank floppy disk (important component memorizing the magnetism signal) is the in bar of hard disk inner part, as the recording density increases and the head flies is to be shorten, then the head will be scored. Therefore, electroless plating the NiP film on the aluminum plate surface again splash, or depositing the type DLC thin film, analysising the structure of the NiP film and DLC thin film, and their electric conducitivity, mechanical property, and the correlation to wear-corrosion characteristic in 3.5% NaCl solution.
The results indicate that the NiP film detected by the X-ray to show the film containing the NiP and Ni3P phases, with anneal temperature increasing, the Ni3P phase gradually increases. The test result of electric conductivity found that the electric conductivity also gradually increases with increasing annealed temperature. Because the more Ni3P phases, so the of hardness of the NiP film also increases. In wear corrosion test, the result showed that the the NiPe film after annealing process in the 280℃, its corrosion current is (icorr=3.68μA/cm2), and the friction coefficient is 0.87, As comparing with 230℃ and 260℃, it bears to the worst wear-corrosion resistance. For the sake of the further identification, the annealing temperature was raised to 400℃, acquiring the corrosion current of (icorr=5.86 μA/cm2), evidencing the trend. The other result finds that the DLC thin film of 3nm thickness comparing with the NiP film (280℃ annealed process), its corrosion current is (icorr=2.87μA/cm2), and the friction coefficient is 0.78, with obviously improvement of wear corrosion properties, the NiP film with other annealing conditions also has the result of the same trend.
Keywords: Electroless NiP, Annealing treatment, Diamond-like carbon, Wear- corrosion, Media.
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