Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy

doi:10.11900/0412.1961.2020.00089

Acta Metall Sin

2020, Vol. 56

Issue (11): 1541-1550 DOI: 10.11900/0412.1961.2020.00089

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Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy

GAO Bowen¹^,², WANG Meihan¹(

), YAN Maocheng²(

), ZHAO Hongtao², WEI Yinghua², LEI Hao²

1 School of Mechanical Engineering, Shenyang University, Shenyang 110044, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

GAO Bowen, WANG Meihan, YAN Maocheng, ZHAO Hongtao, WEI Yinghua, LEI Hao. Electrochemical Preparation and Corrosion Resistance of PEDOT Coatings on Surface of 2024 Aluminum Alloy. Acta Metall Sin, 2020, 56(11): 1541-1550.

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Abstract

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

Received: 19 March 2020

ZTFLH:

TG178

Fund: 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)

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	Bowen GAO
	Meihan WANG
	Maocheng YAN
	Hongtao ZHAO
	Yinghua WEI
	Hao LEI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00089 OR https://www.ams.org.cn/EN/Y2020/V56/I11/1541

Table 1 Compositions of three kinds of electrolyte solutions and corresponding additions of 3,4-ethylenedioxythiophene (EDOT)

Fig.1 Cyclic voltammetry curves (a1~a3) and macrostructures (b1~b3) of poly 3,4-ethylenedioxythiophene (PEDOT) coating prepared by electropolymerization of EDOT in solution 1+EDOT (a1, b1), solution 2+EDOT (a2, b2) and solution 3+EDOT (a3, b3) (E－galvanic potential, i－galvanic current density)

Fig.2 Potentiostatic curves (a1~a3) and macrostructures (b1~b3) of PEDOT coating prepared by electropolymerization of EDOT in solution 1+EDOT (a1, b1), solution 2+EDOT (a2, b2) and solution 3+EDOT (a3, b3)

Fig.3 Low (a, c) and high (b, d) magnified SEM images of PEDOT coatings deposited by constant current density in solution 2+EDOT (a, b) and solution 3+EDOT (c, d)

Fig.4 Galvanic potential and galvanic current density of the PEDOT/2024 aluminium electrode connected to the 2024 aluminium electrode in DHS solution (3.5 g/L (NH₄)₂SO₂+0.5 g/L NaCl)

Fig.5 Nyquist plots (a, d), Bode plots (b, e) and phase angle plots (c, f) of 2024 aluminium electrodes (a~c) and PEDOT/2024 aluminium electrodes (d~f) in DHS solution (Z_Im－imaginary part of impedance, Z_Re－real part of impedance, |Z|－impedance modulus)

Fig.6 Equivalent circuit of immersed electrodes (R_s—electrolyte resistance, Q_cp(sc)—coating capacitance, R_cp—coating resistance, Q_d—diffusion capacitance, Q_cp/Al(sc)—interface capacitance of coating and substrate, R_ct—charge transfer resistance)

Fig.7 Scanning vibrating electrode technique (SVET) current density distribution diagrams on scratched PEDOT/2024 aluminium alloy electrode in DHS solution at 0 h (a), 1 h (b), 3 h (c) and 12 h (d)
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