Use of some drugs for steel corrosion inhibition in sulfuric acids solutions in presence of some halides

Abstract EN

The corrosion inhibition of mild steel in 2.0 M sulphuric acid in the presence of some drugs containing S and N atoms in absence and presence 0.1 M of halides was studied.

The synergistic and antagonism action caused by halides on the corrosion inhibition were investigated by using chemical and electrochemical techniques.

The experimental data showed that the inhibition efficiency increases with increasing the concentration.

The observed small inhibition of corrosion of these compounds may attributed to their weak adsorption on steel.

In presence 0.1 M of halides in absence and presence of different concentrations of studied compounds the inhibition efficiency increases with increasing studied compounds except compounds A and B in presence 0.1 M of Cl -, they show that as the concentration of these two compounds increases, the inhibition of corrosion decreased.

The polarization curves showed that the compounds and halides acted as a mixed type inhibitor.

The experimental results suggested that the presence of halides in the solution stabilized the adsorption of studied compounds molecules on the metal surface and improved the inhibition efficiency.

The adsorption of the studied compounds occur with Langmuir adsorption isotherm.

The synergism parameter (Sθ) is defined and calculated by surface coverage values.