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Electrochemical behaviour and corrosion of lead in some carboxylic acid solutions

✍ Scribed by S. S. Abd-El Rehim; N. H. Amin; L. I. Ali; N. F. Mohamed

Publisher
Wiley (John Wiley & Sons)
Year
1998
Tongue
English
Weight
233 KB
Volume
72
Category
Article
ISSN
0268-2575

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✦ Synopsis

The electrochemical behaviour and corrosion of lead in various concentrations of acetic, lactic (0É01 MÈ1É0 M), oxalic and tartaric (0É01 MÈ0É15 M) acid solutions were studied at 25¡C by a potentiodynamic method. The lead anode is readily soluble both in acetic and lactic acid solutions up to 2000 mV. In these two acid solutions, the anodic dissolution of lead increases with increases in the acid concentration and the dissolution process is under charge transfer control. Lactic acid is more corrosive than acetic acid. However, in oxalic and tartaric acid solutions, the E/i proÐles depend on the acid concentration. Above a certain speciÐc concentration, the proÐles exhibit an anodic current peak associated with a dissolution of the metal and the formation of a passivating lead salt Ðlm and a cathodic peak which is related to the reduction of the Ðlm. The active dissolution of the lead increases with the acid concentration, the scan rate and stirring of the solution. The passivation of lead in these two acid solutions occurs by a dissolutionÈprecipitation mechanism and the process is controlled by di †usion. X-ray di †raction analysis conÐrmed the presence of a passivating salt Ðlm (either lead oxalate or lead tartrate) on the electrode surface. 1998

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