| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系 === 102 === For the application of stainless steel in medical-related equipment, the properties of stainless steel (corrosion resistance, strength and wear resistance) should be enhanced. This study is aimed at the modification of the coating for the stainless steel surface. Zirconia (ZrO2) precursor solution was prepared by polymer complex solution method, and was dip coated on 304 stainless steel substrate to form thin film.
Microstructures and crystal phase of ZrO2 thin film were investigated by the SEM, XRD, and XPS. The thickness and corrosion resistances of ZrO2 thin film were analyzed by Alpha-Step profilometer and potentiodynamic polarization curve, respectively. Atomic force microscopy (AFM) was used to observe surface roughness and particle morphology. Biocompatibility was analyzed by immunocytochemistry, MTS, and LDH assay.
The zirconia thin film was amorphous when the temperature of heat treating was 200~300 ℃, and was composed by the polyethylene alcohol (PEG) with the zirconium ion complexes. The roughness and hydrophilic of stainless steel were improved by coating ZrO2 thin film. The ZrO2 thin films indeed increase the corrosion resistance of stainless steel and have good biocompatibility. The zirconia coatings sample had higher survival ratio and less cytotoxicity than stainless steel. The coating ZrO2 film sample could achieve medical objectives, and the best PEG contents were 4.5 wt%.
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