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Journal Article

Organic composite coatings containing mesoporous silica particles: Degradation of the SiO2 leading to self-healing of the delaminated interface

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Yin,  Yue
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Zhao,  Huan
Mechanism-based Alloy Design, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Prabhakar,  J. Manoj
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Rohwerder,  Michael
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Yin, Y., Zhao, H., Prabhakar, J. M., & Rohwerder, M. (2022). Organic composite coatings containing mesoporous silica particles: Degradation of the SiO2 leading to self-healing of the delaminated interface. Corrosion Science, 200: 110252. doi:10.1016/j.corsci.2022.110252.


Cite as: https://hdl.handle.net/21.11116/0000-000A-242E-B
Abstract
Mesoporous SiO2 is of interest as nano-container for storing active agents for corrosion inhibition or self-healing. However, the potential of mesoporous SiO2 itself for providing active corrosion protection so far was widely ignored. Here, SiO2 containing PVB coatings applied on zinc is shown to inhibit corrosion-driven organic coating disbondment and even to self-heal the already delaminated interface. The protection mechanism is that mesoporous SiO2 will degrade in the high alkaline pH at the delaminated area and forms a silicate layer that blocks underfilm corrosion and even re-establishes a protective and delamination resistant interface.