The inhibition effect and mechanism of 1827 cationic surfactant for cold rolled steel in HCl solution

摘要

Benzyldimethylstearylammonium chloride (1827) exhibits widespread and potent bactericidal efficacy. However, as a q uaternary ammonium salt cationic surfactant with excellent potential for metal corrosion inhibition has not been unrevealed. Its inhibitory performance and mechanism on cold rolled steel (CRS) in HCl medium was investigated by comprehensive methods. The results show that 1827, serves as a mixed inhibitor, exhibits remarkable surface activity in HCl, efficiently suppressing both cathodic and anodic reactions by occupying active sites, achieving an inhibition efficiency of up to 98.49%. The Langmuir isotherm precisely describes the adsorption behavior of 1827 on the CRS surface. XPS, SEM, and AFM analyses indicate that 1827 effectively adsorbs onto the CRS surface, demonstrating significant inhibitory performance. Theoretical calculations reveal strong interactions between the active moieties of 1827 and the CRS surface, leading to the formation of a protective film through physisorption and chemisorption, effectively impeding the aggressive action of corrosive media. This work provide the basis and theoretical foundation for the application of 1827 in the field of metal corrosion protection.