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Self-healing performance and corrosion resistance of graphene oxide–mesoporous silicon layer–nanosphere structure coating under marine alternating hydrostatic pressure

Highlights•Graphene-Mesoporous Silicon Layer-Nanosphere Structure (GSLN) were synthesized.•GSLN coating inhibited the failure of anti-alternating hydrostatic pressure (AHP) performance.•A ferric tannate film formed on scratched GSLN coating under AHP.AbstractAlternating hydrostatic pressure (AHP) is the main cause of the marine coating failure of deep-sea tools and equipment. Herein, we synthesized a novel nanostructure, namely, graphene oxide–mesoporous silicon dioxide layer–nanosphere structure loaded with tannic acid (GSLNTA), as a self-healing coating additive. The anti-corrosion and anti-AHP performance and the self-healing capability of GSLNTA coating were evaluated through electrochemical impedance spectroscopy, field emission scanning electron microscopy, Fourier-transform infrared spectroscopy, and alternating current scanning electrochemical microscopy (AC-SECM). Results showed that the nanolayer structure of GSLNTA effectively inhibited corrosion mass transmission under simulated deep-sea AHP. The nanospheres of GSLNTA released inhibitors to form a ferric tannate film on the exposed metal surface under AHP. The nanolayer and nanosphere of GSLNTA self-healing coating exerted a synergistic effect on anti-corrosion and anti-AHP performance and blocked corrosion factor transmission and coating failure in deep-sea applications. AC-SECM revealed the advantages of local impedance complementation of different electrochemical parameters (|Z| and –phase) to monitor the self-healing of coatings with GSLNTA. This work also investigated the self-healing performance of alkyd varnish coating embedded with synthetic GSLNTA in protecting steel surfaces. Self-healing materials have an “active healing” capability to prolong the life of organic coatings after unwanted external damage in deep-sea environments.Graphical abstractSelf-healing process of the coating embedded with synthetic graphene-mesoporous silicon layer-nanosphere structure to protect alternating hydrostatic pressure in deep-sea.Download high-res image (79KB)Download full-size image

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95/12/18 - با استفاده از افزونه دانلود فایرفاکس و کروم٬ چکیده مقالات به صورت خودکار تشخیص داده شده و دکمه دانلود فری‌پیپر در صفحه چکیده نمایش داده می شود.