소수성 처리 방법에 따른 플라즈마 전해 산화 처리된 마그네슘 합금의 내식성
Effect of Hydrophobizing Method on Corrosion Resistance of Magnesium Alloy with Plasma Electrolytic Oxidation
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Magnesium and its alloys are prone to be corroded, thus surface treatments improving corrosion resistance are always required for practical applications. As a surface treatment of magnesium alloys, plasma electrolytic oxidation (PEO), creating porous stable oxide layer by a high voltage discharge in electrolyte, enhances the corrosion resistance. However, due to superhydrophilicity of the porous oxide layer, which easily allow the penetration of corrosive media toward magnesium alloys substrate, post-treatments inhibiting the transfer of corrosive media in porous oxide layer are required. In this work, we employed a hydrophobizing method to enhance the corrosion resistance of PEO treated Mg alloy. Three types of hydrophobizing techniques were used for PEO layer. Thin Teflon coating with solvent evaporation, self-assembled monolayer (SAM) coating of octadecyltrichlorosilane (OTS) based on solution method and SAM coating of perfluorodecyltrichlorosilane (FDTS) based on vacuum method significantly enhances corrosion resistance of PEO treated Mg alloy with reducing the contact of water on the surface. In particular, the vacuum based FDTS coating on PEO layer shows the most effective hydrophobicity with the highest corrosion resistance.
Abstract
Magnesium and its alloys are prone to be corroded, thus surface treatments improving corrosion resistance are always required for practical applications. As a surface treatment of magnesium alloys, plasma electrolytic oxidation (PEO), creating porous stable oxide layer by a high voltage discharge in electrolyte, enhances the corrosion resistance. However, due to superhydrophilicity of the porous oxide layer, which easily allow the penetration of corrosive media toward magnesium alloys substrate, post-treatments inhibiting the transfer of corrosive media in porous oxide layer are required. In this work, we employed a hydrophobizing method to enhance the corrosion resistance of PEO treated Mg alloy. Three types of hydrophobizing techniques were used for PEO layer. Thin Teflon coating with solvent evaporation, self-assembled monolayer (SAM) coating of octadecyltrichlorosilane (OTS) based on solution method and SAM coating of perfluorodecyltrichlorosilane (FDTS) based on vacuum method significantly enhances corrosion resistance of PEO treated Mg alloy with reducing the contact of water on the surface. In particular, the vacuum based FDTS coating on PEO layer shows the most effective hydrophobicity with the highest corrosion resistance.
참고문헌 (30)
- G.L. Song, , Advanced Engineering Materials, 1, pp.11~33 (1999)
- B. Mordike, , Materials Science Engineering : A, 302, pp.37~45 (2001)
- J. Lee, , Surface and Coatings Technology, 205, pp.4018~4023 (2011)
- 이정훈, "불화칼륨이 첨가된 피로인산구리 도금욕에서 마그네슘합금의 전기도금", 대한금속·재료학회지, 48(3), pp.218~224 (2010), 대한금속·재료학회
- A. Sharma, , Metal Finishing, 96, pp.10~19 (1998)
- K.Z. Chong, , Materials Chemistry and Physics, 80, pp.191~200 (2003)
- Nguyen Van Phuong, "Deposition and Characterization of Electrophoretic Paint on AZ31 Magnesium Alloy", 한국표면공학회지, 49(2), pp.141~146 (2016), 한국표면공학회[DOI]
- 문성모, "AZ31 마그네슘 합금의 플라즈마전해산화 피막 형성에 미치는 수산화 이온 및 규산 이온의 영향", 한국표면공학회지, 47(4), pp.147~154 (2014), 한국표면공학회[DOI]
- G.B. Darband, , Journal of Magnesium and Alloys, 5, pp.74~132 (2017)
- A. Yerokhin, , Surface and Coatings Technology, 122, pp.73~93 (1999)
- P.B. Srinivasan, , Applied Surface Science, 255, pp.4212~4218 (2009)
- H. Duan, , Electrochimica Acta, 51, pp.2898~2908 (2006)
- J. Ou, , Physics of fluids, 16, pp.4635~4643 (2004)
- F. Hizal, , ACS Applied Materials & Interfaces, 9, pp.12118~12129 (2017)
- H. Wang, , Chemical Engineering Journal, 303, pp.37~47 (2016)
- O. Parent, , Cold regions science and technology, 65, pp.88~96 (2011)
- A.B.D. Cassie, , Transactions of the Faraday Society, 40, pp.546~551 (1944)
- W. Choi, , Journal of Colloid and Interface Science, 339, pp.208~216 (2009)
- J. Liang, , Electrochimica Acta, 54, pp.3842~3850 (2009)
- S. Gnedenkov, , Surface and Coatings Technology, 232, pp.240~246 (2013)
- A. Ulman, , Chemical reviews, 96, pp.1533~1554 (1996)
- C. Jeong, , Langmuir, 31, pp.11040~11050 (2015)
- J. Lee, , Advanced Functional Materials, 27, pp.1606040~ (2017)[DOI]
- J. Lee, , Applied Surface Science, 259, pp.454~459 (2012)
- B. Saha, , Journal of Micromechanics and Microengineering, 26, pp.013002~ (2015)
- G. Zhuang, , Journal of Micromechanics and Microengineering, 21, pp.105020~ (2011)
- A. Marmur, , Langmuir, 25, pp.1277~1281 (2009)
- R.N. Wenzel, , Industrial & Engineering Chemistry, 28, pp.988~994 (1936)
- M.A. Sarshar, , Colloid and Polymer Science, 291, pp.427~435 (2013)
- P.J. Yunker, , Nature, 476, pp.308~ (2011)