Effects of Ta, La and Nd additions on the corrosion behaviour of aluminium bronze in mineral acids

Abstract

Corrosion studies of aluminium bronze with and without additions of Ta, La and Nd were carried out in HCl, HNO3 and H2SO4 solutions, using weight loss, polarization and impedance measurements. The study showed that the addition of each of Ta, La and Nd in small quantities effectively inhibited the corrosion of the alloy in HCl solution, the inhibition effect being greatest with low content of the alloying element. The inhibition of corrosion due to alloying additions was observed to be small in H2SO4 solution. In HNO3 medium, these alloying elements at low level showed slightly beneficial effects while they had adverse effects at higher concentrations. © 1992 Chapman & Hall.