Abstract
Micro-arc oxidation (MAO) coatings on KBM10 magnesium alloy were prepared in an electrolyte system with sodium silicate, potassium hydroxide, sodium tungstate, and citric acid. The effects of voltage on the microstructure and corrosion resistance of MAO coatings were studied using stereoscopic microscopy, scanning electron microscopy, x-ray diffraction, scratch tests, potentiodynamic polarization, and electrochemical impedance spectroscopy. The results showed that the roughness of the MAO coatings, diameter, and number of pores increase with the increase in voltage. The coating formed at the voltage of 350 V exhibited the best adhesive strength when evaluated by the automatic scratch tester. The coatings were mainly composed of MgO, MgWO4, and Mg2SiO4, and the content of Mg2SiO4 increased with the increase in voltage. The corrosion resistance of MAO coatings could be improved by changing the applied voltage, and the best corrosion resistance of MAO coating was observed at the voltage of 350 V.
Similar content being viewed by others
References
R.C. Zeng, W. Ke, Y.B. Xu, E.H. Han, and Z.Y. Zhu, Recent Development and Application of Magnesium Alloys, Acta Metall. Sin., 2001, 37, p 673–685
J. Konieczny, L.A. Dobrzański, K. Labisz, and J. Duszczyk, The Influence of Cast Method and Anodizing Parameters on Structure and Layer Thickness of Aluminium Alloys, J. Mater. Process. Technol., 2004, 157, p 718–723
A.A. Luo, Recent Magnesium Alloy Development for Elevated Temperature Applications, Int. Mater. Rev., 2004, 49, p 13–30
R.G. Hu, S. Zhang, J.F. Bu, C.J. Lin, and G.L. Song, Recent Progress in Corrosion Protection of Magnesium Alloys by Organic Coatings, Prog. Org. Coat., 2012, 73, p 129–141
R.G. Song, C. Blawert, W. Dietzel, and A. Atrens, A Study on Stress Corrosion Cracking and Hydrogen Embrittlement of AZ31 Magnesium Alloy, Mater. Sci. Eng. A, 2005, 399, p 308–317
R.G. Song, W. Dietzel, B.J. Zhang, W.J. Liu, M.K. Tseng, and A. Atrens, Stress Corrosion Cracking and Hydrogen Embrittlement of an Al-Zn-Mg-Cu Alloy, Acta Mater., 2004, 52, p 4727–4743
H.F. Guo and M.Z. An, Growth of Ceramic Coatings on AZ91D Magnesium Alloys by Micro-arc Oxidation in Aluminate-Fluoride Solutions and Evaluation of Corrosion Resistance, Appl. Surf. Sci., 2005, 246, p 229–238
W. Shang, B. Chen, X. Shi, Y. Chen, and X. Xiao, Electrochemical Corrosion Behavior of Composite MAO/Sol-Gel Coatings on Magnesium Alloy AZ91D Using Combined Micro-arc Oxidation and Sol-Gel Technique, J. Alloys Compd., 2009, 474, p 541–545
J. Ou, W. Hu, M. Xue, F. Wang, and W. Li, Superhydrophobic Surfaces on Light Alloy Substrates Fabricated by a Versatile Process and Their Corrosion Protection, ACS Appl. Mater. Interfaces, 2013, 5, p 3101–3107
L. Zhao, C. Cui, Q. Wang, and S. Bu, Growth Characteristics and Corrosion Resistance of Micro-arc Oxidation Coating on Pure Magnesium for Biomedical Applications, Corros. Sci., 2010, 52, p 2228–2234
M. Laleh, A.S. Rouhaghdam, T. Shahrabi, and A. Shanghi, Effect of Alumina Sol Addition to Micro-arc Oxidation Electrolyte on the Properties of MAO Coatings Formed on Magnesium Alloy AZ91D, J. Alloys Compd., 2010, 496, p 548–552
G. Li, L. Li, and C. Xu, Research Progress of Micro-arc Oxidation Ceramic Coating on Magnesium Alloy, Hot Work. Technol., 2008, 18, p 30
W.B. Xue, Z.W. Deng, T.H. Zhang, R.Y. Chen, and Y.L. Li, Microarc Oxidation Mechanism of a Cast Magnesium Alloy, Rare Met. Mater. Eng., 1999, 6, p 5
Z. Lin, H. Yu, S. He, D. Wang, and C. Chen, Effect of Na2WO4 on Growth Process and Corrosion Resistance of Micro-arc Oxidation Coatings on 2A12 Aluminum Alloys in CH3COONa Electrolyte, J. Mater. Eng. Perform., 2016, 25, p 297–303
R.G. Song, L. Chen, and H. Lu, Effects of Nanoparticles on the Corrosion Resistance of Fluoropolymer Coatings on Mild Steel, Surf. Eng., 2017, 33, p 451–459
J.J. Zhuang, R.G. Song, N. Xiang, Y. Xiong, and Q. Hu, Effect of Current Density on Microstructure and Properties of PEO Ceramic Coatings on Magnesium Alloy, Surf. Eng., 2017, 33, p 744–752
D.A. Becerik, A. Ayday, L.C. Kumruoğlu, S.C. Kurnaz, and A. Özel, The Effects of Na2SiO3 Concentration on the Properties of Plasma Electrolytic Oxidation Coatings on 6060 Aluminum Alloy, J. Mater. Eng. Perform., 2012, 21, p 1426–1430
J.J. Zhuang, Y.Q. Guo, N. Xiang, Y. Xiong, Q. Hu, and R.G. Song, A Study on Microstructure and Corrosion Resistance of ZrO2-Containing PEO Coatings Formed on AZ31 Mg Alloy in Phosphate-Based Electrolyte, Appl. Surf. Sci., 2015, 357, p 1463–1471
E. Rocca, D. Veys-Renaux, and K. Guessoum, Electrochemical Behavior of Zinc in KOH Media at High Voltage: Micro-arc Oxidation of Zinc, J. Electroanal. Chem., 2015, 754, p 125–132
P. Snopiński, T. Tański, K. Labisz, S. Rusz, P. Jonsta, and M. Król, Wrought Aluminium-Magnesium Alloys Subjected to SPD Processing, Int. J. Mater. Res., 2016, 107, p 637–645
W.L. Lü, T.J. Chen, M.A. Ying, W.J. Xu, Y.A.N.G. Jian, and H.A.O. Yuan, Effects of Increase Extent of Voltage on Wear and Corrosion Resistance of Micro-arc Oxidation Coatings on AZ91D Alloy, Trans. Nonferrous Met. Soc. China, 2008, 18, p s354–s360
C. Ming, M. Yuezhou, M. Ying, and H. Yuan, Effects of Voltage Increment on Performances of Micro-arc Oxidation Coatings of Magnesium Alloys, Rare Met. Mater. Eng., 2010, 11, p 13
M. Mohedano, M. Serdechnova, M. Starykevich, S. Karpushenkov, A.C. Bouali, M.G.S. Ferreira, and M.L. Zheludkevich, Active Protective PEO Coatings on AA2024: Role of Voltage on In-situ LDH Growth, Mater. Des., 2017, 120, p 36–46
X. Lin, X. Yang, L. Tan, M. Li, X. Wang, Y. Zhang, K. Yang, Z.Q. Hu, and J. Qiu, In vitro Degradation and Biocompatibility of a Strontium-Containing Micro-arc Oxidation Coating on the Biodegradable ZK60 Magnesium Alloy, Appl. Surf. Sci., 2014, 288, p 718–726
Y. Wang, H. Yu, C. Chen, and Z. Zhao, Review of the Biocompatibility of Micro-arc Oxidation Coated Titanium Alloys, Mater. Des., 2015, 85, p 640–652
N. Xiang, R.G. Song, H. Li, C. Wang, Q.Z. Mao, and Y. Xiong, Study on Microstructure and Electrochemical Corrosion Behavior of PEO Coatings Formed on Aluminum Alloy, J. Mater. Eng. Perform., 2015, 24, p 5022–5031
X.Z. Jiang, S. Lu, L. Tang, Z.X. Wang, and J. Chen, Influence of Negative Voltage on Micro-arc Oxidation of Magnesium Alloy Under Two Steps Voltage-Increasing Mode, Key Eng. Mater., 2014, 575, p 472–476
N. Xiang, R.G. Song, J.J. Zhuang, R.X. Song, X.Y. Lu, and X.P. Su, Effects of Current Density on Microstructure and Properties of Plasma Electrolytic Oxidation Ceramic Coatings Formed on 6063 Aluminum Alloy, Trans. Nonferrous Met. Soc. China, 2016, 26, p 806–813
Acknowledgments
This work was supported by the National Nature Science Foundation of China under Grant No. 51371039, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the Opening Project of Jiangsu Key Laboratory of Materials Surface and Technology, Changzhou University.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lu, J.P., Cao, G.P., Quan, G.F. et al. Effects of Voltage on Microstructure and Corrosion Resistance of Micro-arc Oxidation Ceramic Coatings Formed on KBM10 Magnesium Alloy. J. of Materi Eng and Perform 27, 147–154 (2018). https://doi.org/10.1007/s11665-017-3088-6
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11665-017-3088-6