Publication: Design and Multidimensional Screening of Flash-PEO Coatings for Mg in Comparison to Commercial Chromium(VI) Conversion Coating
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2021-02-17
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REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) regulations demand for an expedient discovery of a Cr(VI)-free alternative corrosion protection for light alloys even though the green alternatives might never be as cheap as current harmful technologies. In the present work, flash- plasma electrolytic oxidation coatings (FPEO) with the process duration < 90 s are developed on AZ31B alloy in varied mixtures of silicate-, phosphate-, aluminate-, and fluoride-based alkaline electrolytes implementing current density and voltage limits. The overall evaluation of the coatings’ anticorrosion performance (electrochemical impedance spectroscopy (EIS), neutral salt spray test (NSST), paintability) shows that from nine optimized FPEO recipes, two (based on phosphate, fluoride, and aluminate or silicate mixtures) are found to be an adequate substitute for commercially used Cr(VI)-based conversion coating (CCC). The FPEO coatings with the best corrosion resistance consume a very low amount of energy (~1 kW h m−2 µm−1). It is also found that the lower the energy consumption of the FPEO process, the better the corrosion resistance of the resultant coating. The superb corrosion protection and a solid environmentally friendly outlook of PEO-based corrosion protection technology may facilitate the economic justification for industrial end-users of the current-consuming process as a replacement of the electroless CCC process.
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Yerokhin, A.L.; Nie, X.; Leyland, A.; Matthews, A.; Dowey, S.J. Plasma electrolysis for surface engineering. Surf. Coat. Technol. 1999, 122, 73–93. [Google Scholar] [CrossRef]
Chen, D.; Wang, R.; Huang, Z.; Wu, Y.; Zhang, Y.; Wu, G.; Li, D.; Guo, C.; Jiang, G.; Yu, S.; et al. Evolution processes of the corrosion behavior and structural characteristics of plasma electrolytic oxidation coatings on AZ31 magnesium alloy. Appl. Surf. Sci. 2018, 434, 326–335. [Google Scholar] [CrossRef]
Sankara Narayanan, T.S.N.; Park, I.S.; Lee, M.H. Strategies to improve the corrosion resistance of microarc oxidation (MAO) coated magnesium alloys for degradable implants: Prospects and challenges. Prog. Mater. Sci. 2014, 60, 1–71. [Google Scholar] [CrossRef]
Blawert, C.; Dietzel, W.; Ghali, E.; Song, G. Anodizing treatments for magnesium alloys and their effect on corrosion resistance in various environments. Adv. Eng. Mater. 2006, 8, 511–533. [Google Scholar] [CrossRef]
Guo, K.W. A Review of Magnesium/Magnesium Alloys Corrosion and its Protection. Recent Patents Corros. Sci. 2010, 2, 13–21. [Google Scholar] [CrossRef]
Barati Darband, G.; Aliofkhazraei, M.; Hamghalam, P.; Valizade, N. Plasma electrolytic oxidation of magnesium and its alloys: Mechanism, properties and applications. J. Magnes. Alloy. 2017, 5, 74–132. [Google Scholar] [CrossRef]
Lv, G.H.; Chen, H.; Wang, X.Q.; Pang, H.; Zhang, G.L.; Zou, B.; Lee, H.J.; Yang, S.Z. Effect of additives on structure and corrosion resistance of plasma electrolytic oxidation coatings on AZ91D magnesium alloy in phosphate based electrolyte. Surf. Coat. Technol. 2010, 205, S36–S40. [Google Scholar] [CrossRef]
Ma, Y.; Nie, X.; Northwood, D.O.; Hu, H. Systematic study of the electrolytic plasma oxidation process on a Mg alloy for corrosion protection. Thin Solid Films 2006, 494, 296–301. [Google Scholar] [CrossRef]
Rehman, Z.U.; Ahn, B.H.; Jeong, Y.S.; Song, J.I.; Koo, B.H. The influence of various additives on the properties of PEO coatings formed on AZ31 Mg Alloy. Surf. Rev. Lett. 2016, 23, 1650006. [Google Scholar] [CrossRef]
Guo, H.F.; An, M.Z. 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, 229–238. [Google Scholar] [CrossRef]
Wang, L.; Chen, L.; Yan, Z.; Wang, H.; Peng, J. Effect of potassium fluoride on structure and corrosion resistance of plasma electrolytic oxidation films formed on AZ31 magnesium alloy. J. Alloys Compd. 2009, 480, 469–474. [Google Scholar] [CrossRef]
Kazanski, B.; Kossenko, A.; Zinigrad, M.; Lugovskoy, A. Fluoride ions as modifiers of the oxide layer produced by plasma electrolytic oxidation on AZ91D magnesium alloy. Appl. Surf. Sci. 2013, 287, 461–466. [Google Scholar] [CrossRef]
Mu, W.; Han, Y. Characterization and properties of the MgF2/ZrO2 composite coatings on magnesium prepared by micro-arc oxidation. Surf. Coat. Technol. 2008, 202, 4278–4284. [Google Scholar] [CrossRef]
Sah, S.P.; Aoki, Y.; Habazaki, H. Influence of phosphate concentration on plasma electrolytic oxidation of AZ80 magnesium alloy in alkaline aluminate solution. Mater. Trans. 2010, 51, 94–102. [Google Scholar] [CrossRef]
Ghasemi, A.; Raja, V.S.; Blawert, C.; Dietzel, W.; Kainer, K.U. The role of anions in the formation and corrosion resistance of the plasma electrolytic oxidation coatings. Surf. Coat. Technol. 2010, 204, 1469–1478. [Google Scholar] [CrossRef]
Ma, H.; Li, D.; Liu, C.; Huang, Z.; He, D.; Yan, Q.; Liu, P.; Nash, P.; Shen, D. An investigation of (NaPO3)6 effects and mechanisms during micro-arc oxidation of AZ31 magnesium alloy. Surf. Coat. Technol. 2015, 266, 151–159. [Google Scholar] [CrossRef]
Luo, H.; Cai, Q.; Wei, B.; Yu, B.; Li, D.; He, J.; Liu, Z. Effect of (NaPO3)6 concentrations on corrosion resistance of plasma electrolytic oxidation coatings formed on AZ91D magnesium alloy. J. Alloys Compd. 2008, 464, 537–543. [Google Scholar] [CrossRef]
Hadzima, B.; Kajánek, D.; Jambor, M.; Drábiková, J.; Březina, M.; Buhagiar, J.; Pastorková, J.; Jacková, M. Peo of az31 mg alloy: Effect of electrolyte phosphate content and current density. Metals 2020, 10, 1521. [Google Scholar] [CrossRef]
Mori, Y.; Koshi, A.; Liao, J.; Asoh, H.; Ono, S. Characteristics and corrosion resistance of plasma electrolytic oxidation coatings on AZ31B Mg alloy formed in phosphate—Silicate mixture electrolytes. Corros. Sci. 2014, 88, 254–262. [Google Scholar] [CrossRef]
Lu, X.; Prasad, S.; Scharnagl, N.; Störmer, M.; Starykevich, M.; Mohedano, M.; Blawert, C.; Zheludkevich, M.L.; Ulrich, K. Degradation behavior of PEO coating on AM50 magnesium alloy produced from electrolytes with clay particle addition. Surf. Coat. Technol. 2015, 269, 155–169. [Google Scholar] [CrossRef]
Pezzato, L.; Vranescu, D.; Sinico, M.; Gennari, C.; Settimi, A.G.; Pranovi, P.; Brunelli, K.; Dabalà, M. Tribocorrosion properties of PEO Coatings produced on AZ91 magnesium alloy with silicate- or phosphate-based electrolytes. Coatings 2018, 8, 202. [Google Scholar] [CrossRef]
Toulabifard, A.; Rahmati, M.; Raeissi, K.; Hakimizad, A.; Santamaria, M. The effect of electrolytic solution composition on the structure, corrosion, and wear resistance of peo coatings on az31 magnesium alloy. Coatings 2020, 10, 937. [Google Scholar] [CrossRef]
Wierzbicka, E.; Pillado, B.; Mohedano, M.; Arrabal, R.; Matykina, E. Calcium doped flash-peo coatings for corrosion protection of Mg alloy. Metals 2020, 10, 916. [Google Scholar] [CrossRef]
Wierzbicka, E.; Vaghefinazari, B.; Lamaka, S.V.; Zheludkevich, M.L.; Mohedano, M. Flash-PEO as an alternative to chromate conversion coatings for corrosion protection of Mg alloy. Corros. Sci. 2021, 180, 109189. [Google Scholar] [CrossRef]