Azole derivatives as inhibitors for the corrosion of irradiated and non‐irradiated carbon steel in HNO₃ solution

Abstract

Purpose

The purpose of this paper is to investigate the effects of several azole derivatives on the corrosion inhibition of irradiated and non‐irradiated plain carbon steel in 0.5 M nitric acid (HNO₃) solutions at 30‐60°C and to study the mechanism of their inhibitive action.

Design/methodology/approach

The inhibition efficiency was evaluated by means of weight‐loss determinations and polarization techniques at different temperatures. The type of adsorption isotherm, inhibition efficiency, surface coverage and kinetic data were determined.

Findings

The results showed that azole derivatives inhibit the corrosion of irradiated and non‐irradiated carbon steel in acidic solution. The inhibition efficiency increased with the inhibitor concentration and was greater in the case of irradiated carbon steel than for the non‐irradiated one. Kinetic parameters were calculated. The adsorption of inhibitors obeyed the Temkin Isotherm model. Thermodynamic parameters of activation were calculated in the presence of inhibitors.

Research limitations/implications

Electrochemical studies such as electrochemical impedance spectra will throw more light on the mechanism of inhibition.

Practical implications

Azole derivatives can be used as inhibitors in acid medium and addition of halides can improve their inhibition efficiency.

Originality/value

The investigation revealed the possible application of azole derivatives as environmentally friendly inhibitors for corrosion prevention under specific conditions.

Citation

Abdallah, M., Atwa, S.T., Abd‐Allah, N.M. and Fouda, A.S. (2011), "Azole derivatives as inhibitors for the corrosion of irradiated and non‐irradiated carbon steel in HNO₃ solution", Anti-Corrosion Methods and Materials, Vol. 58 No. 1, pp. 31-38. https://doi.org/10.1108/00035591111097684