Electrochemical studies of polyaspartic acid and sodium tungstate as corrosion inhibitors for brass and Cu30Ni alloy in simulated cooled water solutions

Abstract

Purpose

The aim of this paper is to study the inhibition effect of environmentally friendly inhibitors; polyaspartic acid (PASP), Na₂WO₄ and the complex of PASP and Na₂WO₄ for brass and Cu30Ni alloy (B30) corrosion in simulated cooled water solutions.

Design/methodology/approach

The inhibiting effect was investigated in simulated cooled water solutions by potentiodynamic polarization (DC) and electrochemical impedance spectroscopy.

Findings

The results indicated that PASP and Na₂WO₄ both had an inhibition effect. A desirable inhibition effect was shown for brass and B30 corrosion at a PASP concentration of 15 mg/L. The best inhibition effects for Na₂WO₄ appeared at 10 mg/L for B30 corrosion and at 20 mg/L for brass, respectively. The combination of PASP and Na₂WO₄ showed a synergistic effect. The optimum ratio of PASP to Na₂WO₄ was 6:1 at the total inhibitor concentration of 20 mg/L.

Originality/value

This paper has for the first time showed that the two environmentally friendly inhibitors PASP and Na₂WO₄ had an inhibition effect for brass and B30 corrosion and the complex of PASP and Na₂WO₄ had good synergistic effect for brass and B30 corrosion in simulated cooled water solutions.

Citation

Xu, Q., Zhou, G., Wang, H. and Cai, W. (2006), "Electrochemical studies of polyaspartic acid and sodium tungstate as corrosion inhibitors for brass and Cu30Ni alloy in simulated cooled water solutions", Anti-Corrosion Methods and Materials, Vol. 53 No. 4, pp. 207-211. https://doi.org/10.1108/00035590610678893