Corrosion Inhibition Performance and Mechanism of Lignin Bio-based Corrosion Inhibitors

摘要

Low-cost lignin, as the second abundant bio -mass, poss esses many attractive advantages, like non-toxic, biodegradable, renewable, etc. The rich oxygen-containing groups of lignin, like -OH, -COOH and -CHO, provide a source for construction of dynamic bonds between lignin molecules and metal atoms. A series of lignin bio -based corrosion inhibitors were prepared based on grafting and copolymerization methods. Their corrosion inhibition performance for carbon steel in acidic and alkaline media were invesitaged using weight loss and electrochemical test. The in-situ SVET characterization was performed to monitor the change of corrosion inhibition ability with immersion time. Real -time AFM as well as many surface characterizations were carried out to illustrate the adsorption behavior and film-forming process of inhibitor molecules on metal surface. Adsroption phase-forming model was proposed to explain the superior corrosion inhibition performance of lignin bio -based corrosion inhibitors, which provided some novel insights for developing eco -friendly and broad-spectrum pH corrosion inhibitors from lignin-based biomass.