Effect of MWCNTs Content on Corrosion Resistance of Chromium-free Zinc-aluminum Coatings

doi:10.11902/1005.4537.2021.054

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (2): 324-330 DOI: 10.11902/1005.4537.2021.054

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Effect of MWCNTs Content on Corrosion Resistance of Chromium-free Zinc-aluminum Coatings

LI Xujia¹, HUI Honghai², ZHAO Junwen¹(

), WU Guoqiang¹, DAI Guangze¹

^1.School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
^2.The No. 5 Oil Production Plant, PetroChina Changqing Oil Field Company, Xi'an 710000, China

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Abstract

Novel chromium-free zinc-aluminum coatings with different content of multi-walled carbon nanotubes (MWCNTs) were prepared by ultrasonic dispersion method. The effect of MWCNTs on the morphology, composition, adhesion and corrosion resistance of chromium-free zinc aluminum coatings were investigated by means of scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) and adhesion tester as well as immersion test in 3.5%NaCl solution with electrochemical impedance spectroscopy and polarization curve measurement. Results show that when the MWCNTs content was 0%~0.7%, the coatings were smooth flat and dense, the flaky zinc powders and aluminum powders were parallel to the substrate, providing a good physical shielding. When the MWCNTs content was 0.3%, the coating had the best adhesion and showed the best corrosion resistance in NaCl solution, its free-corrosion current was 2.019×10^-5 A/cm², and impedance modulus reached 10³ Ω·cm². In addition, the mechanism of MWCNTs affecting the corrosion resistance of the coating was explored.

Key words: MWCNTs chromium-free zinc-aluminum coating polarization curve impedance spectroscopy corrosion resistance mechanism

Received: 17 March 2021

ZTFLH:

TG174.4

Fund: Sichuan Key Laboratory of High-Performance Materials and Forming Technology for Automobile of China(szjj2017-019)

Corresponding Authors: ZHAO Junwen E-mail: swjtuzjw@swjtu.cn

About author: ZHAO Junwen, E-mail: swjtuzjw@swjtu.cn

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Cite this article:

LI Xujia, HUI Honghai, ZHAO Junwen, WU Guoqiang, DAI Guangze. Effect of MWCNTs Content on Corrosion Resistance of Chromium-free Zinc-aluminum Coatings. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 324-330.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.054 OR https://www.jcscp.org/EN/Y2022/V42/I2/324

Table 1 Chemical compositions of A and B components

Fig.1 Macroscopic morphologies of the coatings with 0% (a), 0.1% (b), 0.3% (c), 0.5% (d) and 0.7% (e) MWCNTs

Fig.2 SEM morphologies of the coatings with 0% (a), 0.3% (b) and 0.7% (c) MWCNTs

Fig.3 Cross-sectional images of the coatings with 0% (a), 0.3% (b) and 0.7% (c) MWCNTs

Fig.4 Local SEM images and EDS analysis of the coatings with 0% (a) and 0.3% (b) MWCNTs

Fig.5 Grid tests of the adhesions of the coatings with 0% (a), 0.1% (b), 0.3% (c), 0.5% (d) and 0.7% (e) MWCNTs

Fig.6 Surface morphologies of the coatings with 0% (a1, b1), 0.1% (a2,b2), 0.3% (a3, b3), 0.5% (a4, b4) and 0.7% (a5, b5) MWCNTs before (a1~a5) and after (b1~b5) immersion in 3.5%NaCl solution for 480 h

Fig.7 Surface morphologies of the scribed coatings with 0% (a1, b1), 0.1% (a2, b2), 0.3% (a3, b3), 0.5% (a4, b4) and 0.7% (a5,b5) MWCNTs before (a1~a5) and after (b1~b5) immersion in 3.5%NaCl solution for 240 h

Fig.8 Polarization curves of the coatings with different MWCNTs contents

Table 2 Self-corrosion current density and self-corrosion potential of the coatings with different MWCNTs contents

Fig.9 Nyquist (a), Bode (b) and equivalent circuit (c) diagrams of the coatings with different MWCNTs contents

Table 3 Fitting parameters of EIS of the coatings with different MWCNTs contents

Fig.10 Mechanism of MWCNTs for improving the corrosion resistance of the Zn-Al coating on Q235 steel

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