| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 98 === The stainless steel alloy (SUS 316L) is widely used in biomedical applications due to its characteristics for better corrosion resistance and a lower friction factor. Particularly, it is also frequently used in dental applications, such as orthodontic braces and wires. In this study, an eletropolishing process is developed to enhance the surface morphology of the SUS 316L without sacrificing its biocompatibility. The potentiostat, optical microscope, atomic force microscope (AFM), scanning electron microscope (SEM), as well as X-ray photoelectron spectroscopy (XPS) are employed to characterize the surface finish of the electropolished SUS 316L pieces. Proper dosage of surfactant is introduced in the electrolyte used in the electropolishing process to give better finish surface. Especially, the best appearance and the lowest roughness values obtained on SUS 316L finishes occur at that with 5 ppm Tergitol 15-S-9 added to the electrolyte. However, the surface roughness increases with either more or less Tergitol 15-S-9 added. From XPS analysis, the contents of Fe and Cr on the electropolished samples seem to decrease. Furthermore, the electropolishing process produces a few compounds with P and Na, such as sodium phosphate and sodium carbonate, which are benefit to the cell growth. According to the cytotoxicity test using NIH 3T3 fibroblast cells, biocompatibility is not significantly reduced on surface finish of electropolished SUS 316L pieces. However, probably owing to the lower RMS surface roughness, fewer cells attached are observed on the electropolished samples, compared to those of as-received ones.
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