생분해성 마그네슘 합금의 펨토초 레이저 표면 개질을 통한 코팅 능력 개선
- 생분해성 마그네슘 합금의 펨토초 레이저 표면 개질을 통한 코팅 능력 개선
- 박재호; 한형섭; 이선희; 박지민; 김유찬; 옥명렬; 석현광; 정석; 이지욱; 전호정
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- Laser surface engineering is emerging as a useful tool for surface modification of materials due to its simple and effective process. Surface modification engineering by laser is possible for non-contact machining and selective process depending on the conditions of the laser such as laser beam size, wavelength, power and so on. Among laser surface engineering, laser surface texturing is an effective technique due to its effectiveness to create dual scale roughness structures resulting in change of surface energy and wettability such as hydrophilic or hydrophobic property. In this study, using femtosecond(fs) laser surface modification, we gave Mg surface super hydrophilic wettability so that we expected improvement of adhesion ability of biodegradable coating layer for controlling corrosion rate. Laser treatment group and non laser treatment group were spin-coated with biodegradable polymer PLGA(poly lactic-co-glycolic acid). Immersion test was conducted in cell media for 7 days. In the immersion test, Mg ion assay showed that the coating layer on laser treated Mg has less Mg ion than the control group. And we could observe that cross-section of laser treated group shows coating layers infiltrate deeper onto the surface. From these data, we expected improvement of adhesion strength due to imbedded coating layer between microscale pits and grooves. Henceforth, through fs laser surface modification, it can be expected to be utilizing in variety of coating technique engineering.
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