Conyza Dicorides: Anew and Efficient Eco-Friendly Corrosion Inhibitor for Mild Steel in 1M HCl Solution

Narjes I. Khaled1, Abd-Alwahab A. Sultan2, Hussein H. Ibrahem3 and Moayad N. Khalaf4

1Technical College of Basrah, Petrochemical Department, Basrah-Iraq
2Southern Technical University / Basrah-Iraq.
3 South oil company / Basrah-Iraq.
4Chemistry Department, College of Science, University of Basrah, P O Box 773, Basrah-Iraq

The inhibitory effects of the ethanol extract of Conyza dioscoridis (EECD) on the corrosion of mild
steel in a 1 M HCl solution were investigated by weight loss measurements at the temperature range
of 25 °C to 65 °C. Results showed that the inhibition efficiency increased with increasing EECD
concentration and decreased with increasing temperature. The inhibition efficiency of 2 g/L EECD
reached approximately 94.87% at 25 °C. The thermodynamic functions of dissolution, activation
energy, and adsorption processes were calculated and discussed. The adsorption of the additive
followed the Langmuir adsorption isotherm.

Keywords: Mild steel; Acid solution; Weight loss; Acid inhibition; Adsorption process;
Corrosion inhibition.

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