Diffusion Behaviours of Three Thioureido Imidazoline Corrosion Inhibitors in a Simulated Sediment Layer

摘要

In the present work, the diffusion behaviours of three thioureido imidazoline inhibitors (SOIMS, SOIMand OIM) in a simulated sediment layer were investigated by ultraviolet-visible spectrophotometry(UV-vis) and potentiodynamic polarization in a simulation setup. The simulated sediment layer wascharacterized by SEM and mercury intrusion experiments. SEM observation shows that the sedimentlayer obtained in this experiment is relatively dense with no large pores. The mercury intrusionexperiment was used to analyse the pore size distribution of the simulated deposition. UV-visexperiments show that the diffusion behaviours of corrosion inhibitors are related to their watersolubility. The better the water solubility of the corrosion inhibitors, the stronger their ability to diffusethrough the sediment layer. The UV-vis and potentiodynamic polarization results suggest that the threecorrosion inhibitors can diffuse through the sediment layer as the diffusion time increases.