Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy
Received date: 2020-03-19
Revised date: 2020-06-05
Online published: 2020-08-18
Supported by
National Natural Science Foundation of China(52071320);National Basic Research Program of China(2014CB643304);Strategic Priority Research Program of the Chinese Academy of Sciences(XDA13040500);Program for Innovation Talents in Univerisity of Liaoning Province(LR2019044)
Poly (3,4-ethylenedioxythiophene) (PEDOT) is one of the most promising anticorrosive materials due to its outstanding conductivity, stability, and environmental compatibility. From the standpoint of corrosion protection of aluminum alloys, PEDOT coatings are a good substitute for the traditional toxic chromium-based coatings. Electrochemical deposition, as a convenient and clean synthesis approach, has been widely employed for direct preparation of PEDOT coatings. Herein, cyclic voltammetry and constant-current method were used to electrodeposit PEDOT coatings on 2024 aluminum alloy substrates. The effects of polymerizing 3,4-ethylenedioxythiophene (EDOT) in three electrolyte solutions (lithium perchlorate (LiClO4) and sodium dodecyl sulfate (SDS), sodium hydrogen phthalate (C8H5NaO4) and SDS, and tetrabutylammonium hexafluorophosphate (TBAPF6) acetonitrile) on the growth and morphology of the PEDOT coatings were investigated. The interactions between the coating and the aluminum substrate were studied through galvanic corrosion, electrochemical impedance spectra (EIS), and scanning vibration electrode technology (SVET). The results show that TBAPF6 exhibited passivation and corrosion-inhibition effects on the substrate and significantly reduced the oxidation potential of EDOT. The surface morphology of the coating prepared via constant-current method showed complete and dense agglomerated spherical particles. The PEDOT coating formed a passivation layer on the substrate, and thus protected it from the corrosive medium. The maximum resistance was achieved in DHS solution (3.5 g/L (NH4)2SO2+0.5 g/L NaCl) after 3 d. The scratched PEDOT coating could promote surface charge delocalization and avoid charge concentration, resulting in electrochemical protection of the aluminum alloy.
Key words： PEDOT coating; 2024 aluminum alloy; electrodeposition; EIS; SVET
Bowen GAO , Meihan WANG , Maocheng YAN , Hongtao ZHAO , Yinghua WEI , Hao LEI . Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy[J]. Acta Metall Sin, 2020 , 56(11) : 1541 -1550 . DOI: 10.11900/0412.1961.2020.00089
| [1] | Dudoladov A O, Buryakovskaya O A, Vlaskin M S, et al. Generation of hydrogen by aluminium oxidation in aquaeous solutions at low temperatures [J]. Int. J. Hydrogen Energy, 2016, 41: 2230 |
| [2] | Zhang X F, Fu C R, Xia Y J, et al. Atomistic origin of the complex morphological evolution of aluminum nanoparticles during oxidation: A chain-like oxide nucleation and growth mechanism [J]. ACS Nano, 2019, 13: 3005 |
| [3] | Gao L, Yue R R, Xu J K, et al. Pt-PEDOT/rGO nanocomposites: One-pot preparation and superior electrochemical sensing performance for caffeic acid in tea [J]. J. Electroanal. Chem., 2018, 816: 14 |
| [4] | Li M R, Wang W, Chen Z, et al. Electrochemical determination of paracetamol based on Au@graphene core-shell nanoparticles doped conducting polymer PEDOT nanocomposite [J]. Sens. Actuators, 2018, 260B: 778 |
| [5] | Aguirre J, Daille L, Fischer D A, et al. Study of poly(3,4-ethylendioxythiphene) as a coating for mitigation of biocorrosion of AISI 304 stainless steel in natural seawater [J]. Prog. Org. Coat., 2017, 113: 175 |
| [6] | Hou J, Zhu G, Xu J K, et al. Anticorrosion performance of epoxy coatings containing small amount of inherently conducting PEDOT/PSS on hull steel in seawater [J]. J. Mater. Sci. Technol., 2013, 29: 678 |
| [7] | Branzoi V, Pilan L, Golgovici F, et al. Electrochemical activity and corrosion protection properties of doped polypyrrole electrodeposited at pure aluminium electrode [J]. Mol. Cryst. Liq. Cryst., 2006, 446: 305 |
| [8] | Cheung K M, Bloor D, Stevens G C. Characterization of polypyrrole electropolymerized on different electrodes [J]. Polymer, 1988, 29: 1709 |
| [9] | Zhu G, Hou J, Zhu H F, et al. Electrochemical synthesis of poly(3,4-ethylenedioxythiophene) on stainless steel and its corrosion inhibition performance [J]. J. Coat. Technol. Res., 2013, 10: 659 |
| [10] | Kumar A M, Hussein M A, Adesina A Y, et al. Influence of surface treatment on PEDOT coatings: Surface and electrochemical corrosion aspects of newly developed Ti alloy [J]. RSC Adv., 2018, 8: 19181 |
| [11] | Lazzaroni R, Brédas J L, Dannetun P, et al. The chemical and electronic structure of the interface between aluminum and conjugated polymers [J]. Electrochim. Acta, 1994, 39: 235 |
| [12] | Gustafsson H, Kvarnstr?m C, Ivaska A. Comparative study of n-doping and p-doping of poly(3,4-ethylenedioxythiophene) electrosynthesised on aluminium [J]. Thin Solid Films, 2008, 517: 474 |
| [13] | Bantikassegn W, Ingan?s O. Electronic properties of junctions between aluminum and doped poly (3,4-ethylenedioxythiophene) [J]. Thin Solid Films, 1997, 293: 138 |
| [14] | Duan C H, Willems R E M, van Franeker J J, et al. Effect of side chain length on the charge transport, morphology, and photovoltaic performance of conjugated polymers in bulk heterojunction solar cells [J]. J. Mater. Chem., 2016, 4: 1855 |
| [15] | Hwang J, Amy F, Kahn A. Spectroscopic study on sputtered PEDOT·PSS: Role of surface PSS layer [J]. Org. Electron., 2006, 7: 387 |
| [16] | Yang Q, Yu S W, Fu P, et al. Boosting performance of non-fullerene organic solar cells by 2D g-C3N4 doped PEDOT:PSS [J]. Adv. Funct. Mater., 2020, 30: 1910205 |
| [17] | Song I S, Heo S W, Lee J Y, et al. Study on the ClO4 doped PEDOT-PEG in organic solvent using a hole injection layer for PLEDs [J]. J. Ind. Eng. Chem., 2011, 17: 651 |
| [18] | Del-Oso J A, Frontana-Uribe B A, Maldonado J L, et al. Electrochemical deposition of poly[ethylene-dioxythiophene] (PEDOT) films on ITO electrodes for organic photovoltaic cells: Control of morphology, thickness, and electronic properties [J]. J. Solid State Electrochem., 2018, 22: 2025 |
| [19] | Adamczyk L, Kulesza P J. Fabrication of composite coatings of 4-(pyrrole-1-yl) benzoate-modified poly-3,4-ethylenedioxythiophene with phosphomolybdate and their application in corrosion protection [J]. Electrochim. Acta, 2011, 56: 3649 |
| [20] | Hülser P, Beck F. Electrodeposition of polypyrrole layers on aluminium from aqueous electrolytes [J]. J. Appl. Electrochem., 1990, 20: 596 |
| [21] | Patra S, Barai K, Munichandraiah N. Scanning electron microscopy studies of PEDOT prepared by various electrochemical routes [J]. Synth. Met., 2008, 158: 430 |
| [22] | Martins J I, Costa S C, Bazzaoui M, et al. Conditions to prepare PPy/Al2O3/Al used as a solid-state capacitor from aqueous malic solutions [J]. J. Power Sources, 2006, 160: 1471 |
| [23] | Sakmeche N, Aaron J J, Aeiyach S, et al. Usefulness of aqueous anionic micellar media for electrodeposition of poly-(3,4-ethylenedioxythiophene) films on iron, mild steel and aluminium [J]. Electrochim. Acta, 2000, 45: 1921 |
| [24] | Sundfors F, Gustafsson H, Ivaska A, et al. Characterisation of the aluminium-electropolymerised poly(3,4-ethylenedioxythiophene) system [J]. J. Solid State Electrochem., 2010, 14: 1185 |
| [25] | Mansfeld F, Jeanjaquet S L, Kendig M W. An electrochemical impedance spectroscopy study of reactions at the metal/coating interface [J]. Corros. Sci., 1986, 26: 735 |
| [26] | Anothumakkool B, Soni R, Bhange S N, et al. Novel scalable synthesis of highly conducting and robust PEDOT paper for a high performance flexible solid supercapacitor [J]. Energy Environ. Sci., 2015, 8: 1339 |
| [27] | Groenendaal L, Jonas F, Freitag D, et al. Poly(3,4-ethylenedioxythiophene) and its derivatives: Past, present, and future [J]. Adv. Mater., 2000, 12: 481 |
| [28] | Malik M A, W?odarczyk R, Kulesza P J, et al. Protective properties of hexacyanoferrate containing polypyrrole films on stainless steel [J]. Corros. Sci., 2005, 47: 771 |
| [29] | Vempati S, Ertas Y, Celebioglu A, et al. Tuning the degree of oxidation and electron delocalization of poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) with solid-electrolyte [J]. Appl. Surf. Sci., 2017, 419: 770 |
| [30] | Prabakar S J R, Pyo M. Corrosion protection of aluminum in LiPF6 by poly(3,4-ethylenedioxythiophene) nanosphere-coated multiwalled carbon nanotube [J]. Corros. Sci., 2012, 57: 42 |
| [31] | Yan M C, Tallman D E, Rasmussen S C, et al. Corrosion control coatings for aluminum alloys based on neutral and n-doped conjugated polymers [J]. J. Electrochem. Soc., 2009, 156: C360 |
/
| 〈 |
|
〉 |
