1Department of Metallurgy, Toyama Technical College, Toyama
The effect of halogen ion on the anodic dissolution of galena in dilute sulfulic acid solution was studied by means of the potentiodynamic and galvanostatic polarization method and electrondiffraction. The experimental results obtained are as follows:
(1) Galena shows an active-passive behavior similar to the lead electrode in sulfuric acid solution and the surface film formed on the galena electrode in the solution is a lead sulfate and shows a characteristic behavior of ionic conductors.
(2) The anodic dissolution of galena in the sulfuric acid solutipn containing halogen ion increases with increasing concentration of halogen ion in the solution in the following order Cl->Br->I->no addition.
(3) The surface film formed on the galena electrode in the sulfuric acid solution containing Br- and Cl- is a lead sulfate and shows a characteristic behavior of ionic conductors.
(4) The acceleration of the reaction in anodic dissolution of galena in the solution containing halogen ion is caused by the ``effect of anion'' that the electrode interface is activated by halogen ion and the formation of halide complex.
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