Abstract
The inhibition performance of two synthesized imidazole zwitterions: monomeric/polymeric 3-(1-vinyl-3-imidazolio) propanesulfonate (VIPS/PVIPS) on carbon steel in 0.5 M HCl has been investigated through electrochemical tests, SEM, AFM and contact angle measurements. As for VIPS and PVIPS, the inhibition efficiency increases with the concentration. The effect of temperature and immersion time for PVIPS is also measured. Prolonging the immersion time within 24 h can increase the corrosion inhibition rate of PVIPS at 298 K and increasing the temperature is not conducive to its corrosion inhibition in the range of 298–333 K. What's more, both VIPS and PVIPS acted as mixed corrosion inhibitors and found to be adsorbed onto the steel surface mainly through physical adsorption, obeying the Langmuir adsorption isotherm. Molecular dynamics (MD) simulation studies further corroborated the adsorption and inhibition action of VIPS/PVIPS on the steel surface, and the parallel adsorption mode is most energetically stable on the surface and finally makes them effective inhibitors.
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