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ANODIC PASSIVATION PROCESSES OF INDIUM IN ALKALINE SOLUTION |
Hebing Zhou;Weishan Li |
华南师范大学化学系 |
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Abstract The anodic passivation processes of indium in 3mol/L KOH solutions are investigated by using linear potential sweep,cyclic voltammetry,chronocoulometry and chronopotentiometry.Indium behaves as an active-passive metal in cincentrated alkaline solution.The oxidation processes of indium procees by two steps at active region, forming [InOH]ad from In and [In(OH)3]ad from [Inoh]ad.At lower potential,the formation of [InOH]ad is fast but the formation of [In(OH)3]ad is slow, so the reaction behaves as one electron transfer.At higher potential,both formations of [InOH]ad and [In(OH)3ad are fast,so the reaction behaves as three electron transfer,Two kinds of the reactions at active region are controlled by mass transport step.With the formation of monolayer [In(OH)3]ad, indium goes into the passive region.[In(OH)3]ad is not stable.Tr can dissolve into the solution and be transformed into more stable In2O3.Indium is oxidized directly to trivalent indium at the passive region.Within the passive region,the oxidation product is stable In2O3 at higher potential,and nonstoichiometric In2O3 which is more stable than [In(OH)3]ad bur less than In2O3 at lower potential.
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Received: 17 July 2003
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Corresponding Authors:
Hebing Zhou
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