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The electrochemistry of the nickel sulfides—2. Ni3S2

✍ Scribed by G.P. Power

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
463 KB
Volume
27
Category
Article
ISSN
0013-4686

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✦ Synopsis

Ahtract-The anodk and cathodic bchwiour of Ni& (synthetic tilwoodite) in acid solutions is cxammed. & pruemx of a sulfim-rich sd6de layer which pamivatcs the muface is dcomnatratcd. This layer exists in the potmtkl region 0 to 0.6V sm. a& itself diasolvca slowly io acid_ At higher potentials complex, aaion dqmdeat dissolution b&&our iav&ing the formation of elemental sulfur and sulfur oxyanions oeeurs. At cathodic potentials, kmn-oxi&tive acid dissolution with the fortnatiop of I&S is observed, coacurmutly with the evolution of hydro&en and the production of metaUic nickel. INTRODUCZION As has been outlined in a ptious puper(lJ, the elcctrochcmistry of the nickel sulfides is of intere&.in taausafitsapplicmt&mtotheeIu&a~ofthe ~of~:seediono.Theanodicrs actiom8 of Ni& am of pa&culW iWzra& .bowwer, Knt~andmhavest~tirt~~~tionof Ni& and%NiS in some~dctailC3,4] using potential sweep and galvallosta~ methods,intllerange +0.5to + 2.5 v (SC&?). In acid dfiitc, nitrate and per&orate m&k& the potc!otid sweepexpcrirmnts on M&3* slmw

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