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The electrochemical behaviour of galena (lead sulphide) — I. Anodic dissolution

✍ Scribed by R.L. Paul; M.J. Nicol; J.W. Diggle; A.P. Saunders

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
847 KB
Volume
23
Category
Article
ISSN
0013-4686

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✦ Synopsis

Steady state potentiostatic experiments on a galena rotating-disc electrode in perchlorate solutions of varying pH values indicated that the primary reaction governing the anodic dissolution is PbS + Pbz + + S + 2e. A mechanism involving a sulphur intermediate is proposed for this process. Cyclicvoltammetric studies with the use of rotating ring-disc electrodes in perchlorate and sulphate solutions revealed that the pH value at the electrode surface has a marked elkt on the anodic dissolution. The morphology of the anodically produced sulphur has a bearing on the active-passive behaviour oCgalcna. The smxies responsible for the uassivation of the aalena surface in sutphate and perchlorare solutions are shown to be the basic lead sulphates.

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