✦ LIBER ✦

The corrosion and passivation of tin in borate solutions and the effect of halide ions

✍ Scribed by S.A.M. Refaey

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 494 KB
Volume: 41
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(96)00068-0

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✦ Synopsis

The corrosion and passivation of tin in sodium borate (Na,B,O,) solutions at pH = 8.35 were studied by potentiodynamic and cyclic voltammetry techniques. The effect of the following factors on the anodic dissolution and passivation of tin metal are discussed: concentration of borate ion, pH, potential scan rate, successive cyclic voltammetry, switching potential and progressive additions of halide ions. The primary passivation is attained when the metal is covered with a film of Sn(OH), and/or SnO. Permanent passivity occurs when Sn(OH), and/or SnO, forms a continuous layer on the electrode surface. The anodic dissolution reactions are controlled by diffusion. In all experiments, the aggressive action of the halides decreased in the order Cl-> Br-. SEM examination confirms the occurrence of pitting corrosion in presence of halide ions. The pitting potential (E,,,) decreases with increasing halide concentration.

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