Novel high-performance and long-life anti-corrosion coating with rust conversion and self-healing characteristics based on waste biomass derived carbon nanosheets

Fabrication of coating system with high-performance and long-life anti-corrosion performance is an important way of prolonging service life and reduces the waste of metal equipment. Herein, one smart coating with rust conversion and self-healing characteristics was prepared though the addition of tannic acid (TA)-grafted cornstalks derived carbon nanosheets (CNS) and 8-hydroxyquinoline (8-HQ)-loaded mesoporous silica (MS) into the coating. Thermogravimetric analysis results indicated that the grafting/loading rates for TA and 8-HQ were 17.5% and 27.3%, respectively. Pull-out test results reflected that the value of dry adhesion of the smart coating at the steel/coating interface was two times higher than that of the pure coating. Electrochemical impedance spectroscopy results reflected that the anti-corrosion performance and service life of the coating were evidently improved, and the coating exhibited self-repairing property. /Z(/f=0.01Hz) of smart coating was still 1.8 x 10(7) Omega cm(2) after 80 days immersion. The high-performance and long-life of the coating were attributed to the sheet structure of CNS, formation of TA-Fe layer at steel/coating interface as well as chelate products between 8-HQ and corrosion products. It is expected that the prepared smart coating could find wide application due to the simplification the operations and improvement the service life of traditional coating.

Automated summary

In this study, a smart coating with rust conversion and self-healing characteristics was prepared. The coating exhibited improved anti-corrosion performance and service life through enhanced adhesion at the interface and the formation of chelate products. It is expected to find wide applications in the field of traditional coatings.