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. 2025 Jul 1;15(1):22288.
doi: 10.1038/s41598-025-06528-2.

Preparation and properties study of self-healing anticorrosive coating based on MCM-41 nanocontainer and triazinyl corrosion inhibitor

Guangqun Cao  1 , Yilei Ruan  2 , JianHua Liu  2 , Zhiyong Hu  2 , Hailin Zhu  3
Affiliations

Preparation and properties study of self-healing anticorrosive coating based on MCM-41 nanocontainer and triazinyl corrosion inhibitor

Guangqun Cao et al. Sci Rep. .

Abstract

In this paper, a self-healing anticorrosive coating with pH response based on epoxy was prepared. Firstly, triazinyl corrosion inhibitor (Inh) was loaded into mesoporous molecular sieve (MCM-41) by the vacuum impregnation method. Polyethylenimine (PEI) and sodium polystyrene sulfonate (PSS) were coated on the surface through the layer-by-layer (LBL) self-assembly method. Then a pH-responsive self-healing anti-corrosion coating Inh@MS/PEI/PSS-EP was obtained by adding the newly prepared nanocapsules to the organic epoxy coating. Eventually, foutier transform infrared spectroscopy (FT-IR), N2 adsorption/desorption, Zeta potential test, thermogravimetry (TG), testultraviolet-visible absorption spectroscopy (UV-vis), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and atomic force microscopy (AFM) were used to investigate the pH response, corrosion resistance, self-healing properties of the prepared coating. The results demonstrate that the coating prepared by this method can actively release Inh in alkaline environment. EIS and surface topography analysis manifest the decay-resistance of the organic epoxy coating was improved. The results of the molecular dynamics (MD) simulation show that Inh can adsorb on the carbon steel surface, which is consistent with the experimental results. The corrosion resistance of the modified epoxy coating was improved, after 30 days of immersion, the |Z|0.01 Hz of the modified epoxy coating is 3 orders of magnitude higher than that of the pure epoxy coating.

Keywords: Mesoporous molecular sieve; Polyelectrolyte; Self-healing coating; pH response.

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Conflict of interest statement

Declarations. Competing interests: The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Triazine corrosion inhibitor structural formula.
Fig. 2
Fig. 2
Preparation process diagram of Inh@MS/PEI/PSS-EP coating.
Fig. 3
Fig. 3
characterization of MS, Inh, and Inh@MS. (a) FT-IR spectra of Inh, MS and Inh@MS; (b) TG curve of MS and Inh@MS.
Fig. 4
Fig. 4
The surface area comparison plots of MS, Inh@MS and Inh@MS/PEI/PSS.
Fig. 5
Fig. 5
Plot of Zeta potential changes for the self-assembly process of Inh@MS/PEI/PSS.
Fig. 6
Fig. 6
Micro-schematic diagram of the preparation of Inh@MS/PEI/PSS.
Fig. 7
Fig. 7
results of UV–visible test. (a) The UV–visible spectrum maps of Inh, PEI, and PSS; (b), (c), and (d) are the standard curves of Inh at pH = 3, pH = 7, and pH = 11.
Fig. 8
Fig. 8
Plot of the controllable release of Inh in different environments.
Fig. 9
Fig. 9
Nyquist plots (a, b) and bode plots (a′, b′) of EP and Inh@MS/PEI/PSS-EP coating immersed in 3.5wt% NaCl solution at room temperature for different time.
Fig. 10
Fig. 10
The quivalent circuit diagram of EP coating (a) and Inh@MS/PEI/PSS-EP coating (b).
Fig. 11
Fig. 11
(a, b) Nyquist plots and (a′, b′) bode piots of EP coating and Inh@MS/PEI/PSS-EP coating with scratches immersed in 3.5wt% NaCl solution at room temperature for different time.
Fig. 12
Fig. 12
SEM and EDS plots with scratches of EP coating (a, a′, a′′) and Inh@MS/PEI/PSS-EP coating (b, b′, b′′).
Fig. 13
Fig. 13
Images of scratched EP and Inh@MS/PEI/PSS-EP coatings during salt spray tests.
Fig. 14
Fig. 14
Molecular dynamics simulation diagram of corrosion inhibitor molecule.
Fig. 15
Fig. 15
Mechanism diagram of self-healing coating.
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