EFFECT OF ORGANIC ADDITIVES ON ELECTRODEPOSITION OF TIN FROM ACID SULFATE SOLUTION

Ewa Rudnik, Grzegorz Chowaniec

Abstract


Basic electrochemical experiments on the kinetics of tin deposition from an acid sulfate solution containing organic additives were performed. The measurements showed that tin deposits with activation polarization in a narrow potential range. Organic additives like gelatin and β-naphtol inhibit the charge transfer stage of the cathodic reaction due to the formation of adsorption layers. In turn, the gluconate ions increase the rate of tin deposition due to the bonding of hydrogen ions and inhibiting hydrogen coevolution. This results in serious changes in the morphology of tin deposits from isolated polyhedron crystals (no additive) via rectangular plates (β-naphtol) and thin plates (sodium gluconate) to rounded grains (gelatin).

Keywords


electrolysis; gluconate; gelatin; β-naphtol; morphology

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References


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DOI: http://dx.doi.org/10.7494/mafe.2018.44.1.41

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