Corrosion resistance and anti-soiling performance of micro-arc oxidation/graphene oxide/stearic acid superhydrophobic composite coating on magnesium alloys

Abstract

Magnesium (Mg) alloys, the lightest metal construction material used in industry, play a vital role in future development. However, the poor corrosion resistance of Mg alloys in corrosion environments largely limits their potential wide applications. Therefore, a micro-arc oxidation/graphene oxide/stearic acid (MAO/GO/SA) superhydrophobic composite coating with superior corrosion resistance was fabricated on a Mg alloy AZ91D through micro-arc oxidation (MAO) technology, electrodeposition technique, and self-assembly technology. The composition and microstructure of the coating were characterized by scanning electron microscopy, X-ray diffraction, energy dispersive spectroscopy, and Raman spectroscopy. The effective protection of the MAO/GO/SA composite coating applied to a substrate was evaluated using potentiodynamic polarization, electrochemical impedance spectroscopy tests, and salt spray tests. The results showed that the MAO/GO/SA composite coating with a petal spherical structure had the best superhydrophobicity, and it attained a contact angle of 159.53° ± 2°. The MAO/GO/SA composite coating exhibited high resistance to corrosion, according to electrochemical and salt spray tests.

Keywords

magnesium alloy / composite coating / superhydrophobic / corrosion resistance / anti-soiling performance

References

[1] M. Yin, L.F. Hou, Z.W. Wang, et al., Self-generating construction of applicable corrosion-resistant surface structure of magnesium alloy, Corros. Sci., 184(2021), art. No. 109378.

[2] Esmaily M, Svensson JE, Fajardo S, et al. Fundamentals and advances in magnesium alloy corrosion. Prog. Mater. Sci., 2017, 89, 92.

[3] Wang SD, Ye XS, Zhang HF, et al. Superhydrophobic silane/fluorinated Attapulgite@SiO₂ composite coatings on magnesium alloy for corrosion protection. ChemistrySelect, 2020, 5(33): 10329.

[4] Zeng ZR, Stanford N, Davies CHJ, Nie JF, Birbilis N. Magnesium extrusion alloys: A review of developments and prospects. Int. Mater. Rev., 2019, 64(1): 27.

[5] Wu L, Yang DN, Zhang G, et al. Fabrication and characterization of Mg-M layered double hydroxide films on anodized magnesium alloy AZ31. Appl. Surf. Sci., 2018, 431, 177.

[6] S. García-Rodríguez, B. Torres, N. Pulido-González, E. Otero, and J. Rams, Corrosion behavior of 316L stainless steel coatings on ZE41 magnesium alloy in chloride environments, Surf. Coat. Technol., 378(2019), art. No. 124994.

[7] Gnedenkov AS, Sinebryukhov SL, Mashtalyar DV, Gnedenkov SV. Protective properties of inhibitor-containing composite coatings on a Mg alloy. Corros. Sci., 2016, 102, 348.

[8] Yang W, Xu DP, Wang JL, Yao XF, Chen J. Microstructure and corrosion resistance of micro arc oxidation plus electrostatic powder spraying composite coating on magnesium alloy. Corros. Sci., 2018, 136, 174.

[9] Wang Y, Huang ZQ, Yan Q, et al. Corrosion behaviors and effects of corrosion products of plasma electrolytic oxidation coated AZ31 magnesium alloy under the salt spray corrosion test. Appl. Surf. Sci., 2016, 378, 435.

[10] Lamaka SV, Vaghefinazari B, Mei D, Petrauskas RP, Höche D, Zheludkevich ML. Comprehensive screening of Mg corrosion inhibitors. Corros. Sci., 2017, 128, 224.

[11] Song ZW, Xie ZH, Yu G, Hu BN, He XM, Zhang XY. A novel palladium-free surface activation process for electroless nickel deposition on micro-arc oxidation film of AZ91D Mg alloy. J. Alloys Compd., 2015, 623, 274.

[12] Al Zoubi W, Ko YG. Flowerlike organic—inorganic coating responsible for extraordinary corrosion resistance via self-assembly of an organic compound. ACS Sustainable Chem. Eng., 2018, 6(3): 3546.

[13] Li OL, Tsunakawa M, Shimada Y, Nakamura K, Nishinaka K, Ishizaki T. Corrosion resistance of composite oxide film prepared on Ca-added flame-resistant magnesium alloy AZCa612 by micro-arc oxidation. Corros. Sci., 2017, 125, 99.

[14] X. He, R.G. Song, and D.J. Kong, Microstructure and corrosion behaviours of composite coatings on S355 offshore steel prepared by laser cladding combined with micro-arc oxidation, Appl. Surf. Sci., 497(2019), art. No. 143703.

[15] W. Shang, F. Wu, S.Q. Jiang, Y.Q. Wen, N. Peng, and J.Q. Jiang, Effect of hydrophobicity on the corrosion resistance of microarc oxidation/self-assembly/nickel composite coatings on magnesium alloys, J. Mol. Liq., 330(2021), art. No. 115606.

[16] Li DW, Wang HY, Luo D, Liu Y, Han ZW, Ren LQ. Corrosion resistance controllable of biomimetic superhydrophobic microstructured magnesium alloy by controlled adhesion. Surf. Coat. Technol., 2018, 347, 173.

[17] Jiang ST, Zhang J, Shun SZ, Chen MF. The formation of FHA coating on biodegradable Mg—Zn—Zr alloy using a two-step chemical treatment method. Appl. Surf. Sci., 2016, 388, 424.

[18] J. Kuang, Z. Ba, Z.Z. Li, Z.Z. Wang, and J. Qiu, The study on corrosion resistance of superhydrophobic coatings on magnesium, Appl. Surf. Sci., 501(2020), art. No. 144137.

[19] Liu Y, Xue JZ, Luo D, Wang HY, Gong X, Han ZW, Ren LQ. One-step fabrication of biomimetic superhydrophobic surface by electrodeposition on magnesium alloy and its corrosion inhibition. J. Colloid Interface Sci., 2017, 491, 313.

[20] Tang H, Wu T, Wang H, Jian X, Wu YF. Corrosion behavior of HA containing ceramic coated magnesium alloy in Hank’s solution. J. Alloys Compd., 2017, 698, 643.

[21] Jiang D, Zhou H, Wan S, Cai GY, Dong ZH. Fabrication of superhydrophobic coating on magnesium alloy with improved corrosion resistance by combining micro-arc oxidation and cyclic assembly. Surf. Coat. Technol., 2018, 339, 155.

[22] Wang ZW, Su YL, Li Q, et al. Researching a highly anti-corrosion superhydrophobic film fabricated on AZ91D magnesium alloy and its anti-bacteria adhesion effect. Mater. Charact., 2015, 99, 200.

[23] Feng LB, Zhu YL, Wang J, Shi XT. One-step hydrothermal process to fabricate superhydrophobic surface on magnesium alloy with enhanced corrosion resistance and self-cleaning performance. Appl. Surf. Sci., 2017, 422, 566.

[24] J.F. Wei, B.C. Li, L.Y. Jing, N. Tian, X. Zhao, and J.P. Zhang, Efficient protection of Mg alloy enabled by combination of a conventional anti-corrosion coating and a superamphiphobic coating, Chem. Eng. J., 390(2020), art. No. 124562.

[25] Zhao JM, Xie X, Zhang C. Effect of the graphene oxide additive on the corrosion resistance of the plasma electrolytic oxidation coating of the AZ31 magnesium alloy. Corros. Sci., 2017, 114, 146.

[26] Shang W, Wu F, Wen YQ, He CB, Zhan XQ, Li YQ. Corrosion resistance and mechanism of graphene oxide composite coatings on magnesium alloy. Ind. Eng. Chem. Res., 2019, 58(3): 1200.

[27] Hu RR, He YJ, Huang MR, Zhao GK, Zhu HW. Strong adhesion of graphene oxide coating on polymer separation membranes. Langmuir, 2018, 34(36): 10569.

[28] F. Gao, Y.D. Hu, Z.H. Gong, et al., Fabrication of chitosan/heparinized graphene oxide multilayer coating to improve corrosion resistance and biocompatibility of magnesium alloys, Mater. Sci. Eng. C: Mater. Biol. Appl., 104(2019), art. No. 109947.

[29] Y. Zhang, J.P. Wang, Z. Zhang, et al., Silane-modified graphene oxide composite as a promising corrosion-inhibiting film for magnesium alloy AZ31, Front. Mater., 8(2021), art. No. 737792.

[30] Nazeer AA, Al-Hetlani E, Amin MO, Quiñones-Ruiz T, Lednev IK. A poly(butyl methacrylate)/graphene oxide/TiO₂ nanocomposite coating with superior corrosion protection for AZ31 alloy in chloride solution. Chem. Eng. J., 2019, 361, 485.

[31] Talyzin AV, Mercier G, Klechikov A, et al. Brodie vs Hummers graphite oxides for preparation of multi-layered materials. Carbon, 2017, 115, 430.

[32] Jie H, Xu QJ, Wei L, Min YL. Etching and heating treatment combined approach for superhydrophobic surface on brass substrates and the consequent corrosion resistance. Corros. Sci., 2016, 102, 251.

[33] S.Q. Jiang, Z.Y. Zhang, D. Wang, Y.Q. Wen, N. Peng, and W. Shang, ZIF-8-based micro-arc oxidation composite coatings enhanced the corrosion resistance and superhydrophobicity of a Mg alloy, J. Magnes. Alloys, (2021). DOI: https://doi.org/10.1016/j.jma.2021.07.027

[34] Yuan J, Yuan R, Li P, Mao DL, Feng T. Fabrication and properties of the superhydrophobic ceria-based composite coating on magnesium alloy. Mater. Corros., 2021, 72(8): 1305.

[35] Yu WT, Sun RX, Guo ZQ, et al. Novel fluoridated hydroxyapatite/MAO composite coating on AZ31B magnesium alloy for biomedical application. Appl. Surf. Sci., 2019, 464, 708.

[36] Wu CQ, Liu Q, Chen RR, et al. Fabrication of ZIF-8@SiO₂ micro/nano hierarchical superhydrophobic surface on AZ31 magnesium alloy with impressive corrosion resistance and abrasion resistance. ACS Appl. Mater. Interfaces, 2017, 9(12): 11106.