Extraction of lignin from lignocellulosic biomass (bagasse) as a green corrosion inhibitor and its potential application of composite metal framework organics in the field of metal corrosion protection.

With increasing awareness of environmental protection, additional attention has been given to environmentally friendly metal anticorrosion research. In this paper, the green organic corrosion inhibitor sodium lignosulfonate (SLS) was extracted from bagasse waste, and a Ce-MOF@SLS smart anticorrosive film containing the inhibitor was prepared on the surface of an aluminum alloy by in situ electrodeposition. The material was characterized by SEM, EDS, FT-IR, XRD and XPS, and its corrosion resistance was tested with EIS and neutral salt spray tests. The electrochemical data showed that the Ce-MOF@SLS film reached a corrosion current density of 3.36 × 10 A/cm, and no corrosion spots appeared after 105 days of salt spray experiments, indicating that the smart film provided long-lasting protection for aluminum alloys. The antiseptic mechanism of the Ce-MOF@SLS smart film was verified by quantum chemical calculations and molecular dynamics simulations. The research result not only provide a new method for the study of green intelligent anti-corrosion films for aluminum alloys, but also offer a novel approach to the treatment of domestic waste.