Corrosion Inhibition Performance of Rapeseed Cake Meal Extract on Cold-Rolled Steel in Clch2cooh: Adsorption Characteristics and Mechanism Study

Abstract

The utilization of agricultural and forestry waste for the preparation of metal corrosion inhibitors presents a promising approach for metal protection. This study employed a combined approach of theoretical calculations and experimental technologies to systematically research the inhibition effect of rapeseed cake meal extract (RCME) obtained through reflux extraction on cold-rolled steel (CRS) in 0.10 M chloroacetic acid (ClCH2COOH) system. Results imply that RCME reaches an inhibition efficiency of 91.6% at 50 °C, with its adsorption process following the Langmuir isotherm. RCME exerts the effect of mixed inhibitors through the mechanism of "active site blockade", demonstrating both cathodic and anodic inhibition capabilities. Surface characterization further confirms that RCME forms an adsorption film on CRS surface. Additionally, compared with single active ingredient, a mixture of rutin, adenine, L-lysine, linolenic acid, and linoleic acid can form a denser adsorption film on CRS surface, thereby exhibiting superior its inhibition performance.

Keywords: Corrosion, Inhibition, Rapeseed cake meal extract, Cold-rolled steel, Molecular dynamics simulation