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September 10, 2025

Sprayable Graphene Oxide-Based Superhydrophobic Coating with High Mechanical/Chemical Stability and Self-Healing Performance for Corrosion Protection of Mg Alloys

XYXiaoming YuNagoya University MZMeiling ZhangEast China University of Science and Technology

Key Points

The coating shows high corrosion protection, with a polarization resistance of 3.88 × 108 Ω cm2 in harsh environments.
After 35 days in a NaCl solution, the coating maintains an impedance modulus of 3.97 × 107 Ω cm2, demonstrating long-term durability.
Self-healing capabilities allow recovery of defects up to 10 μm within 24 hours, indicating resilience against damage.
The use of graphene oxide enhances mechanical and chemical stability, leading to superior performance in corrosion prevention.

Abstract

This study introduces a robust, self-healing superhydrophobic coating for magnesium (Mg) substrates, leveraging the synergistic effects of MQ organosilicon polymer, octadecylamine (ODA), polydopamine (PDA), and copper-loaded graphene oxide (GO). The coating exhibits exceptional superhydrophobicity, outstanding stability in harsh environments, superior resistance to smudging, and effective self-cleaning capabilities. Electrochemical impedance spectroscopy (EIS) in 3.5 wt % NaCl solution demonstrates an impedance modulus (|Z|) at f = 0.01 Hz and polarization resistance (Rp) of 3.49 × 108 Ω cm2 and 3.88 × 108 Ω cm2, respectively, 7 orders of magnitude higher than AZ31B. After 35 days of immersion, |Z|f=0.01 Hz and Rp remain at 3.97 × 107 Ω cm2 and 4.63 × 107 Ω cm2, respectively, highlighting long-term corrosion protection. In cases of damage or corrosion, the dynamic coordination of PDA-Cu2+ enables self-healing, fully recovering visible coating defect up to 10 μm in width within 24 h in 3.5 wt % NaCl solution. This work presents a promising approach for durable, self-healing superhydrophobic coatings with exceptional mechanical and chemical stability.

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