Alizarin violet 3B as a novel corrosion inhibitor for steel in HCl, H2SO4 solutions

The inhibition effect of alizarin violet 3B (AV3B) on the corrosion of cold rolled steel (CRS) in 1.0 M HCl and 0.5 M H2SO4 solutions was investigated for the first time by weight loss, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) methods. The results show that AV3B is a good inhibitor, and exhibits more efficient in 1.0 M HCl than 0.5 M H2SO4. The adsorption of AV3B on CRS surface obeys Langmuir adsorption isotherm in both acids. Polarization curves reveal that AV3B acts as a mixed-type inhibitor.

► Alizarin violet 3B (AV3B) is a good inhibitor for the corrosion of steel in 1.0 M HCl and 0.5 M H2SO4 solutions.
► The inhibition efficiency follows the order: 1.0 M HCl > 0.5 M H2SO4.
► In both acids, the adsorption obeys Langmuir adsorption isotherm.
► AV3B act as a mixed-type inhibitor in 1.0 M HCl and 0.5 M H2SO4 solutions.