Modulating Micro-Arc Oxidation Coating Properties on 6061 Aluminum Alloy via OH− to F− Ion Ratio Optimization
Source abstract
Abstract
We investigate the influence of the NaOH to KF ratio in a silicate electrolyte on the corrosion resistance and tribological properties of micro-arc oxidation (MAO) coatings on a 6061 aluminum alloy. By optimizing the electrolyte composition, we achieved significant improvements in coating quality. The surface morphology and composition of the coatings were characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Our findings reveal that the coatings produced at a 2:1 NaOH/KF ratio exhibited superior corrosion resistance, with a corrosion potential of −1.279 V, corrosion current density of 1.85 × 10−7 A·cm−2, and protective resistance of 1.50 × 105 Ω·cm2. Additionally, the surface roughness and coating thickness were measured at 0.68 μm and 8.04 μm, respectively, providing a robust foundation for enhancing the anticorrosive and wear-resistant properties of 6061 aluminum alloy.
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Research context
OpenAlex topics: Metal and Thin Film Mechanics · Corrosion Behavior and Inhibition · High-Temperature Coating Behaviors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical and Electrical Engineering, Guangdong University of Science and Technology, Dongguan 523083, China
School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
Dongguan Readore Technology Co., Ltd., Dongguan 523083, China
Funding
Dongguan Sci-tech Commissioner Program · Energy Saving and Emission Reduction Innovation Team · Key scientific research projects for general universities of Guangdong province
References (31)
Show source-provided references
1. Strengthening-toughening of high-strength al-zn cast aluminum alloys: Research progress and prospects
2. Evolution process of the plasma electrolytic oxidation (peo) coating formed on aluminum in an alkaline sodium hexametaphosphate ((NaPO3)6) electrolyte10.1016/j.jallcom.2019.05.253 ↗
3. Gao, J., Cui, K., Li, S., Zhong, L., Dai, J., Yang, Z., and Qiang, R. (2024). A New Process of Chemical Plating Ni-P Electromagnetic Induction Heating Activation on the Surface of Aluminium Alloy Base Material. Coatings, 14.10.3390/coatings14091221 ↗
4. Surface preparation of aluminum alloys for electroplating10.1134/S1070427220090098 ↗
5. Preparation of inorganic coating by sol-gel method and its thermal protection performance
6. Integrated self-healing coating system for outstanding corrosion protection of AA202410.1016/j.surfcoat.2020.125521 ↗
7. Wu, Z., Chen, Y., Liu, H., Hua, W., Duan, J., and Kong, L. (2023). A review of the developments of the characteristics and mechanisms of airless spraying on complex surfaces. Coatings, 13.10.3390/coatings13122095 ↗
8. Baroni, E., Fortini, A., Meo, L., Soffritti, C., Merlin, M., and Garagnani, G.L. (2024). Ball-on-disk wear maps for bearing steel–hard anodized en aw-6082 aluminum alloy tribocouple in dry sliding conditions. Coatings, 14.10.3390/coatings14111469 ↗
9. Wang, T.J., Liu, X.A., Zhang, K.Y., Xie, L., He, M.T., Lu, Y.L., Luo, K.Y., Hu, K.J., Li, G.Z., and Wang, M.Z. (Phys. Met. Metallogr., 2024). Effect of current density on the wear resistance of ceramic coatings formed on 7075 aluminum alloy via microarc oxidation, Phys. Met. Metallogr., prepublish.10.1134/S0031918X23603207 ↗
10. Role of the electrolyte composition in establishing plasma discharges and coating growth process during a micro-arc oxidation10.1016/j.surfcoat.2020.126349 ↗
11. Growth methods of PEO coatings on 7075 aluminum alloy at two cathodic current densities10.1016/j.surfcoat.2022.128099 ↗
12. Effect of frequency of plasma electrolytic oxidation on the microstructure and corrosion resistance of 6061 aluminium alloy10.1016/j.surfcoat.2023.129861 ↗
13. Effect of electrolyte composition on the formation of PEO coatings on AA2024 aluminium alloy10.1016/j.surfin.2023.103797 ↗
14. Effect of naoh concentration on microstructure and corrosion resistance of MAO coating on cast Al−Li alloy. J. Transactions. Nonferrous10.1016/S1003-6326(21)65549-8 ↗
15. Effect of potassium fluoride on growth and microstructure of MAO coatings on az91d magnesium alloys
16. Xie, X.M., Yang, E.H., Zhang, Z.Y., Wei, W., Li, D., Zhao, X., Yang, R., and Li, W. (2023). Effects of K2TIF6 and electrolyte temperatures on energy consumption and properties of MAO coatings on 6063 aluminum alloy. Materials, 16.10.3390/ma16051830 ↗
17. Sun, S., Ye, G., Lu, Z., Weng, Y., Ma, G., and Liu, J. (2021). Surface treatment of Zn-Mn-Mg alloys by micro-arc oxidation in silicate-based solutions with different NaF concentrations. Materials, 14.10.3390/ma14154289 ↗
18. Effect of sodium fluoride additive on microstructure and corrosion performance of micro-arc oxidation coatings on EK30 magnesium alloy10.1016/j.surfcoat.2024.131628 ↗
19. Abbas, A., Ting-Yi, W., and Hsin-Chih, L. (2023). Effects of Electrolyte Compositions and Electrical Parameters on Micro-Arc Oxidation Coatings on 7075 Aluminum Alloy. J. Compos. Sci., 7.10.3390/jcs7110472 ↗
20. Effects of KF, NaOH, and KOH Electrolytes on Properties of Microarc-oxidized Coatings on AZ91D Magnesium Alloy10.1149/1.3158552 ↗
21. Optimization of dual electrolyte and characteristic of micro-arc oxidation coating fabricated on ZK60 Mg alloy10.1016/S1003-6326(11)60803-0 ↗
22. Electrochemical corrosion behavior of composite coatings of sealed MAO coating on magnesium alloy AZ91D10.1016/j.electacta.2005.08.026 ↗
23. Growth of ceramic coatings on AZ91D magnesium alloys by micro-arc oxidation in aluminateefluoride solutions and evaluation of corrosion resistance10.1016/j.apsusc.2004.11.031 ↗
24. The effect of MAO processing time on surface properties and low temperature infrared emissivity of ceramic coating on aluminium 6061 alloy10.1016/j.infrared.2013.06.006 ↗
25. Study of ceramic coatings formed by MAO on Al matrix composite surface10.1179/026708499101516434 ↗
26. Kaseem, M., Yang, H.W., and Ko, Y.G. (2017). Toward a nearly defect-free coating via high-energy plasma sparks. Sci. Rep., 7.10.1038/s41598-017-02702-3 ↗
27. Dzhurinskiy, D.V., Dautov, S.S., Shornikov, P.G., and Akhatov, I.S. (2020). Surface modification of aluminum 6061-O alloy by plasma electrolytic oxidation to improve corrosion resistance properties. Coatings, 11.10.3390/coatings11010004 ↗
28. Effect of TiN particles on mechanical and anticorrosive properties of oxide layersformed by PEO on silumin10.1088/1742-6596/2144/1/012009 ↗
29. Final surface modification for better wear resistance of ceramic coating on cast AlSi10Mg alloy10.1016/j.ceramint.2022.09.224 ↗
30. Microstructure and wear resistance of micro-arc oxidation ceramic coatings prepared on 2A50 aluminum alloys10.1016/j.surfcoat.2020.125853 ↗
31. Structural, tribological and electrochemical behavior of SiC nanocomposite oxide coatings fabricated by plasma electrolytic oxidation (PEO) on AZ31 magnesium alloy10.1016/j.jallcom.2016.05.096 ↗