Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 4    No. 1    March 1994

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CATHODIC REDUCTION OF METAL-CHLORIDE COORDINATION IONS
Zen Zhenou1, Yang Songqing2

1.Department of Applied Chemistry Chemistry; South China University of Technology; Guangzhou510641; China
2.Department of Chemistry; Central South University of Technology; Changsha 410083; China

Abstract:The reduction mechanism of metal chloride coordination ions is elucidated with elementaland experimental study. Through the elemental study one can know that the galvanostatic stepmethod or chronopotential curves are very convenient to the determination of cathixlic reductionmechanism of metul chlorides. Through the variation of iτ1/2 with the concentration of Cl-  the discharging species at the surface of cathode can be determined as well as the rcaction mechanism, cuprous chloride , zinc chloride and lead chloride are used as examples to illustrate the ele-mental study. Their reaction mechanism can be expressed as:
( 1 ) CuCl32- →CuCl2- +Cl- is a fast preceding reaction , and CuCI2-+e→Cu+2 Cl- is adischarging reaction with mass transfer determined step.
(2) ZnCl3- →ZnCl2+ Cl- is a fast preceding reaction , and ZnCl2 + 2e→Zn + 2Cl-, onestep discharging with diffusion controlling step.
( 3)PbCl42-+ 2e →Pb+4Cl-and )PbCl3-+ 2e →Pb+3Clthere is no preceding reactioninvolved in the lead chloride case and the direct discharging step is also controlled by the diffu-sion step.

 

Key words: cathodic reduction metal chloride coordination ions copper chloride zinc chlo-ride lead chloride chronopotential method

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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