한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제54권5호
  • /
  • Pages.238-247
  • /
  • 2021
  • /
  • 1225-8024(pISSN)
  • /
  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
DOI QR코드

DOI QR Code

PEO 처리시 Ca-GP첨가에 따른 AZ31합금의 내식성 및 표면특성에 관한 연구

A study on corrosion resistance and surface properties of AZ31 alloy according to Ca-GP addition during PEO treatment

  • 이준수 (전북대학교 금속공학과) ;
  • 박제신 (전북대학교 금속공학과) ;
  • 박일송 (전북대학교 금속공학과)
  • Lee, Jun-Su (Department of Metallurgical Engineering, Jeonbuk National University) ;
  • Park, Je-Shin (Department of Metallurgical Engineering, Jeonbuk National University) ;
  • Park, Il-Song (Department of Metallurgical Engineering, Jeonbuk National University)
  • 투고 : 2021.10.06
  • 심사 : 2021.10.29
  • 발행 : 2021.10.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

PEO (plasma electrolytic oxidation) was applied to modify the surface of AZ31 magnesium alloy in this study. The mixed solution of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) was used as the electrolyte, and 0 - 0.05 g/L of Ca-GP (Glycerol Phosphate Calcium salt) was added in the electrolyte as an additive. PEO treatment was conducted at a current density of 30mA/cm2 for 5 minutes using a DC power supply. The surface properties were identified by SEM, XRD and surface roughness analyses, and the corrosion resistance was evaluated by potentiodynamic polarization and immersion tests. In addition, the biocompatibility was evaluated by immersion test in SBF solution. As the concentration of Ca-GP was increased, the surface morphology was denser and more uniform, and the amount of Ca and the thickness of oxide layer increased. Only Mg peak was observed in XRD analysis due to very thin oxide layer. The corrosion resistance of PEO-treated samples increased with the concentration of Ca-GP in comparision with the untreated sample. In particular, the highest corrosion resistance was identified at the group of 0.04g Ca-GP through potentiodynamic polarization and immersion tests in saline solution (0.9 wt.%NaCl). During the immersion in saline solution, pH rapidly increased at the beginning of immersion period due to rapid corrosion, and then increase rate of pH decreased. However, the pH value in the SBF temporarily increased from 7.4 to 8.5 during the day, then decreased due to the inhibition of corrosion with HA(hydroxyapatite) formation.

키워드

과제정보

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임 (No. 2019R1A2C1010250), 이 논문은 2021년도 정부(산업통상자원부)의 재원으로 한국산업기술진흥원의 지원을 받아 수행된 연구임(P0002019, 2021년 산업혁신인재성장지원사업)

참고문헌

  1. Y.F. Jiang, X.W. Guo, Y.H. Wei, C.Q. Zhai, W.J. Ding, Corrosion protection of polypyrrole electrodeposited on AZ91 magnesium alloys in alkaline solutions, Synthetic Metals, 139(2003) 335-339 https://doi.org/10.1016/S0379-6779(03)00181-4
  2. H. Hoche, C. Rosenkranz, A. Delp, M.M. Lohrengel, E. Broszeit, C. Berger, Investigation of the macroscopic and microscopic electrochemical corrosion behaviour of PVD-coated magnesium die cast alloy AZ91, surf. Coat. Technol., 193(2005) 178-184 https://doi.org/10.1016/j.surfcoat.2004.08.204
  3. Xiangyu Lu, Xingguo Feng, Yu Zuo, Pei Zhang, Chuanbo Zheng, Investigation of the macroscopic and microscopic electrochemical corrosion behaviour of PVD-coated magnesium die cast alloy AZ91, Progress in Organic Coatings, 104(2017) 188-198 https://doi.org/10.1016/j.porgcoat.2016.11.001
  4. R. Udhayan, D. P. Bhatt, On the corrosion behaviour of magnesium and its alloys using electrochemical techniques, Journal of Power Sources 63(1996) 103-107 https://doi.org/10.1016/S0378-7753(96)02456-1
  5. S-M. Moon, Y-S. Jeong. 마그네슘의 표면처리. 한국기계연구원., 55-64 (2004)
  6. F.H Froes, D. Eliezer, E. Aghion, The Science, Technology, and Applications of Magnesium, JOM 50(1998) 30-34
  7. S-J. Kim, J-I. Kim, M. Okido, Sealing Effects of Anodic Oxide Films Formed on Mg-Al Alloys, Korean J. Chem. Eng., 21(4)(2004) 915-920 https://doi.org/10.1007/BF02705540
  8. H-I. Wu, Y-L. Cheng, L-L. Li, Z-H. Chen, H-M. Wang, Z. Zhang, The anodization of ZK60 magnesium alloy in alkaline solution containing silicate and the corrosion properties of the anodized films, Appl. Surf. Sci., 253(2007) 9387-9394 https://doi.org/10.1016/j.apsusc.2007.05.085
  9. W-C. Jung, Y-H. Jin, J-J. Choi, J-K. Yang, A Study on the Wear Resistance Characteristics of Anodic Oxide Films Formed on Aluminium alloy using a Plasma Electrolytic Oxidation, J. Korean Inst. Surf. Eng., 51(6)(2018) 381-386 https://doi.org/10.5695/JKISE.2018.51.6.381
  10. S. Durdu, S. Bayramoglu, A. Demirtas, M. Usta, A.H. Ucisik, Characterization of AZ31 Mg Alloy coated by plasma electrolytic oxidation, Vacuum, 88(2013) 130-133 https://doi.org/10.1016/j.vacuum.2012.01.009
  11. G-C. Shim, Factors Influencing Plasma Electrolytic Oxidation(PEO) Coatings on Magnesium Alloys: A Review, Korean J. Met. Mater., 55(5) (2017) 296-307 https://doi.org/10.3365/kjmm.2017.55.5.296
  12. E. Ziyaei, M. Atapour, H. Edris, and A. Hakimizad, Corrosion Behavior of PEO Coatings Formed on AZ31 Alloy in Phosphate-Based Electrolytes with Calcium Acetate Additive, J. Mat. Eng. perform., 26(2017) 3204-3215 https://doi.org/10.1007/s11665-017-2765-9
  13. M. Bobby Kannan, R. Walter, A. Yamamoto, H. Khakbaz and C. Blawert, Electrochemical surface engineering of magnesium metal by plasma electrolytic oxidation and calcium phosphate deposition: biocompatibility and in vitro degradation studies, RSC Advances, 8(51)(2018) 29189-29200 https://doi.org/10.1039/c8ra05278f
  14. F. Simchen, L-M Rymer, M. Sieber and T. Lampke, Composition of highly concentrated silicate electrolytes and ultrasound influencing the plasma electrolytic oxidation of magnesium, IOP Conf. Ser.: Mater. Sci. Eng., 181(012040)(2017) 1-13 https://doi.org/10.1088/1757-899X/181/1/012040
  15. S-M. Moon, C-N. Yang, S-J. Na, Effects of Hydroxide and Silicate ions on the Plasma Electrolytic Oxidation of AZ31 Mg Alloy, J. Kor. Inst. Surf. Eng., 47(4)(2014) 147-154 https://doi.org/10.5695/JKISE.2014.47.4.147
  16. J-S. Lee, H-G. Baek, S-W. Kim, Effect of Sodium Aluminate Concentration in Electrolyte on the Properties of Anodic Films Formed on AZ31 Mg Alloy by Plasma Electrolytic Oxidation, J. Kor. Society. Heat Treatment., 25(5)(2012) 227-232 https://doi.org/10.12656/jksht.2012.25.5.227
  17. S. Hiromoto, M. Tomozawa, Hydroxyapatite coating of AZ31 magnesium alloy by a solution treatment and its corrosion behavior in NaCl solution, Surf. Coat. Technol., 205(19)(2011) 4711-4719 https://doi.org/10.1016/j.surfcoat.2011.04.036
  18. Y-S. Park, S-H. Han, K-S. Song, Oxidation behavior on the surface of titanium metal specimens at high temperatures(300~1000℃), J. Anal. Sci. Technol., 22(6)(2009) 464-470
  19. H. Chen, G. H. Lv, G. L. Zhang, H. Pang. X. Q. Wang, H. J. Lee, S. Z. Yang, Corrosion performance of plasma electrolytic oxidized AZ31 magnesium alloy in silicate solutions with different additives, surf. Coat. Technol., 205(2010) 532-535
  20. I-S. Park, U-J. Choi, H-K. Yi, B-K. Park, M-H. Lee, T-S. Bae, Biomimetic apatite formation and biocompatibility on chemically treated Ti-6Al-7Nb alloy, Surf. Interface. Anal., 40(2008) 37-42 https://doi.org/10.1002/sia.2666