Effect of aromatic aldehydes on the electrochemical behavior of bismuth in chloride media

• A.G. Berezhnaya¹ and V.I. Mishurov²

¹ Southern Federal University, Zorge st., 7, Rostov-on-Don, 344090 Russian Federation
² Don State Technical University, Gagarin square 1, Rostov-on-Don, 344000 Russian Federation

Abstract: The effect of benzaldehyde (I), 2-hydroxy-4-methoxybenzaldehyde (II), 3,4-dimethoxybenzaldehyde (III), and α-bromocinnamaldehyde (IV) on the partial electrode reactions occurring on bismuth in a neutral chloride solution was investigated. It was established that the dependence of cathodic and anodic process rates on aldehyde concentration is not linear. At equal concentrations, I and III better inhibit cathodic hydrogen evolution than compounds II and IV containing more hydrophilic and hydrophobic substituents, respectively. The aldehydes change the basic parameters of the anodic polarization curve of bismuth. It was shown that dissolution of bismuth in chloride solution with and without the aldehydes studied occurs under diffusion control.

Keywords: bismuth, anodic dissolution, activation, passivation, benzaldehyde, 2-hydroxy4-methoxybenzaldehyde, 3,4-dimethoxybenzaldehyde, bromocinnamaldehyde.

Int. J. Corros. Scale Inhib., 2016, 5, no. 3, 200–208 PDF (271 K)
doi: 10.17675/2305-6894-2016-5-3-2

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