Broad bean stalk extract as a novel green inhibitor on cold rolled steel corrosion in HCl solution

摘要

Agricultural waste of broad bean ( Vicia faba ) stalks extract (VFSE) was prepared in this work. The corrosion inhibition properties of VFSE on cold rolled steel (CRS) in 1.0 M HCl solution were investigated. The result showed that the corrosion inhibition effect of VFSE was significant, and the maximum inhibition efficiency was 90.3% with 100 mg L -1 of VFSE. VFSE adsorption on the CRS surface conformed to the Langmuir adsorption isotherm, and increasing VFSE concentration resulted in higher impedance values. In addition, the surface micromorphology test indicated that VFSE formed an adsor ption film on CRS surface, which effectively retarded HCl corrosion of CRS. TOF-SIMS, XPS and other test results further confirmed the binding of corrosion inhibitor molecules to CRS. The main components of VFSE were determined by LC-MS analysis. Through theoretical calculations, it was found that the active sites of these main components adsorb vigorously to CRS substrates, theoretically confirming the corrosion inhibition effect of VFSE.