Self-polymerization of dopamine on zinc oxide nanoparticles for enhanced corrosion resistance in epoxy-aluminum coatings

doi:10.1016/j.cjche.2025.05.024

中国化学工程学报 ›› 2025, Vol. 85 ›› Issue (9): 304-315.DOI: 10.1016/j.cjche.2025.05.024

Self-polymerization of dopamine on zinc oxide nanoparticles for enhanced corrosion resistance in epoxy-aluminum coatings

Yasin Albarqouni¹, Nurul Huda Abu Bakar², Mohammad R. Thalji³, Arman Abdullah¹

1. Faculty of Chemical and Process Engineering Technology, Universiti Malaysia Pahang Al-Sultan Abdullah, Lebuhraya Persiaran Tun Khalil Yaakob, 26300 Kuantan, Pahang, Malaysia;
2. Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang Al-Sultan Abdullah, Lebuhraya Persiaran Tun Khalil Yaakob, 26300 Kuantan, Pahang, Malaysia;
3. Korea Institute of Energy Technology (KENTECH), 21 KENTECH-gil, Naju, Jeollanam-do, 58330, Korea

收稿日期:2025-01-13 修回日期:2025-05-07 接受日期:2025-05-08 出版日期:2025-09-28 发布日期:2025-07-01
通讯作者: Arman Abdullah,E-mail:armanabdullah@umpsa.edu.my
基金资助:
The authors thank the Ministry of Higher Education Malaysia for financial support under the Fundamental Research Grant Scheme No. FRGS/1/2021/TKO/UMP/02/75 (RDU210141) and Universiti Malaysia Pahang Al-Sultan Abdullah for providing laboratory facilities and financial support under Internal Grant RDU210350.

Self-polymerization of dopamine on zinc oxide nanoparticles for enhanced corrosion resistance in epoxy-aluminum coatings

Yasin Albarqouni¹, Nurul Huda Abu Bakar², Mohammad R. Thalji³, Arman Abdullah¹

1. Faculty of Chemical and Process Engineering Technology, Universiti Malaysia Pahang Al-Sultan Abdullah, Lebuhraya Persiaran Tun Khalil Yaakob, 26300 Kuantan, Pahang, Malaysia;
2. Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang Al-Sultan Abdullah, Lebuhraya Persiaran Tun Khalil Yaakob, 26300 Kuantan, Pahang, Malaysia;
3. Korea Institute of Energy Technology (KENTECH), 21 KENTECH-gil, Naju, Jeollanam-do, 58330, Korea

Received:2025-01-13 Revised:2025-05-07 Accepted:2025-05-08 Online:2025-09-28 Published:2025-07-01
Contact: Arman Abdullah,E-mail:armanabdullah@umpsa.edu.my
Supported by:
The authors thank the Ministry of Higher Education Malaysia for financial support under the Fundamental Research Grant Scheme No. FRGS/1/2021/TKO/UMP/02/75 (RDU210141) and Universiti Malaysia Pahang Al-Sultan Abdullah for providing laboratory facilities and financial support under Internal Grant RDU210350.

摘要/Abstract

摘要： Conventional organic coatings often face limitations in providing long-term corrosion protection in aggressive environments. This study introduces a dual-functional polydopamine-zinc oxide (PD-Z) composite incorporated into an epoxy (EP) matrix (PD-Z/EP) to enhance the hydrophobicity and corrosion resistance of aluminum substrates. Characterization analyses confirmed the successful fabrication of the PD-Z composite. Electrochemical measurements, specifically potentiodynamic polarization, are conducted after three days of immersion in a 3.5% (mass) NaCl solution, significantly decreasing corrosion current density (I_corr) from 249.4 nA·cm^-2 for pure EP to 167 nA·cm^-2 for PD-Z/EP. Concurrently, the corrosion rate decreased from 0.004 to 0.0002 mm·a^-1. Additionally, electrochemical impedance spectroscopy (EIS) demonstrated a marked increase in the low-frequency impedance modulus (Z₀.₀₁ _Hz) from 0.07×10⁶ to 1.2114×10⁶ Ω·cm², indicating superior corrosion inhibition. The exceptional anodic and cathodic protective performance of the PD-Z/EP coating is attributed to the synergistic effects of polydopamine and ZnO, which enhance chloride ion entrapment, hydrophobic barrier properties, and overall corrosion resistance.

关键词: Adsorption, Nanoparticles, Organic compounds, Sol-gel, Self-polymerization, Corrosion

Abstract: Conventional organic coatings often face limitations in providing long-term corrosion protection in aggressive environments. This study introduces a dual-functional polydopamine-zinc oxide (PD-Z) composite incorporated into an epoxy (EP) matrix (PD-Z/EP) to enhance the hydrophobicity and corrosion resistance of aluminum substrates. Characterization analyses confirmed the successful fabrication of the PD-Z composite. Electrochemical measurements, specifically potentiodynamic polarization, are conducted after three days of immersion in a 3.5% (mass) NaCl solution, significantly decreasing corrosion current density (I_corr) from 249.4 nA·cm^-2 for pure EP to 167 nA·cm^-2 for PD-Z/EP. Concurrently, the corrosion rate decreased from 0.004 to 0.0002 mm·a^-1. Additionally, electrochemical impedance spectroscopy (EIS) demonstrated a marked increase in the low-frequency impedance modulus (Z₀.₀₁ _Hz) from 0.07×10⁶ to 1.2114×10⁶ Ω·cm², indicating superior corrosion inhibition. The exceptional anodic and cathodic protective performance of the PD-Z/EP coating is attributed to the synergistic effects of polydopamine and ZnO, which enhance chloride ion entrapment, hydrophobic barrier properties, and overall corrosion resistance.

Key words: Adsorption, Nanoparticles, Organic compounds, Sol-gel, Self-polymerization, Corrosion

Yasin Albarqouni, Nurul Huda Abu Bakar, Mohammad R. Thalji, Arman Abdullah. Self-polymerization of dopamine on zinc oxide nanoparticles for enhanced corrosion resistance in epoxy-aluminum coatings[J]. 中国化学工程学报, 2025, 85(9): 304-315.

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Self-polymerization of dopamine on zinc oxide nanoparticles for enhanced corrosion resistance in epoxy-aluminum coatings

Self-polymerization of dopamine on zinc oxide nanoparticles for enhanced corrosion resistance in epoxy-aluminum coatings

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