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

摘要

Purpose - The aim of this paper is to study the inhibition effect of environmentally friendly inhibitors; polyaspartic acid (PASP), Na{sub}2WO{sub}4 and the complex of PASP and Na{sub}2WO{sub}4 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 Na{sub}2WO{sub}4 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 Na{sub}2WO{sub}4 appeared at 10 mg/L for B30 corrosion and at 20 mg/L for brass, respectively. The combination of PASP and Na{sub}2WO{sub}4 showed a synergistic effect. The optimum ratio of PASP to Na{sub}2WO{sub}4 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 Na{sub}2WO{sub}4 had an inhibition effect for brass and B30 corrosion and the complex of PASP and Na{sub}2WO{sub}4 had good synergistic effect for brass and B30 corrosion in simulated cooled water solutions.