On the pitting corrosion of tin by sulphate anion

The corrosion behaviour of tin in Na 2SO 4 solutions at concentrations of 0.1–1.0 M and in the pH range 3–11 was investigated by using potentiodynamic and cyclic voltammetry techniques. The voltammograms involve two anodic peaks prior to the initiation of pitting corrosion. The first peak correspond...

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Bibliographic Details
Published in:Corrosion science 1992-11, Vol.33 (11), p.1789-1796
Main Authors: Abd El-Rehim, S.S., Taha, Fouad, Saleh, M.B., Mohamed, S.A.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
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Summary:The corrosion behaviour of tin in Na 2SO 4 solutions at concentrations of 0.1–1.0 M and in the pH range 3–11 was investigated by using potentiodynamic and cyclic voltammetry techniques. The voltammograms involve two anodic peaks prior to the initiation of pitting corrosion. The first peak corresponds to the formation of Sn(OH) 2 and/or SnO. The second peak correlates to the formation of Sn(OH) 4 and/or SnO 2. The pitting initiation can be explained through the adsorption competition between sulphate anions and the passivating species on the passivated electrode surface. The critical pitting potential depends on the sulphate concentration, pH and scan rate. Three cathodic peaks are observed on the negative-going scan, corresponding to the reduction of the dissolved pitting corrosion products, SnO 2 and SnO respectively. Successive cycling has no significant influence on the pitting potential, but leads to a progressive decrease in the heights of the anodic peaks as a result of incomplete reduction during the cathodic sweeping.
ISSN:0010-938X
1879-0496
DOI:10.1016/0010-938X(92)90009-R