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化学学报
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化学学报 ›› 1963, Vol. 29 ›› Issue (4): 236-242. 上一篇    下一篇

论文

鋅在氫氧化鉀溶液中的阳极溶解和自动溶解的电化学机理

張志炳, 李成宗, 謝仙德   

  1. 复旦大学化学系
  • 投稿日期:1962-07-21 发布日期:2013-06-03

ELECTROCHEMICAL MECHANISM OF ANODIC DISSOLUTION AND SELF-DISSOLUTION OF ZINC IN POTASSIUM HYDROXIDE SOLUTIONS

CHANG CHIH-BING, LEE CHENG-CHUNG, SHIEH SHIAN-DEH   

  1. Department of Chemistry, Fudan University
  • Received:1962-07-21 Published:2013-06-03

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697

被引次数

3

1.測定鋅电极在氫氧化鉀溶液(从0.2N到飽和溶液)中自动溶解的稳定电位,找出当碱浓度大于～1N时,φc～logαKOH具綫性关系,其斜率为-59毫伏特.2.测定鋅电极在不同浓度(1.07-8.31N)氫氧化鉀溶液中的阳极极化曲綫,其綫性部分的斜率为40毫伏特.当溶液的logaKOH改变1个单位时,阳极极化电位約移动80毫伏特(在恆定的电流密度下).3.用重量法測定鋅在氫氧化鉀溶液中(浓度为1.61-9.81N)的腐蝕速度,找出logic～～logaKOH具綫性关系,其斜率約为0.4.4.根据以上实驗数据提出鋅在氫氧化鉀溶液(浓度大于～1N)中的阳极溶解机理为:Zn+OH-→ZnOH+e(a)ZnOH+OH-→Zn(OH)2+e(b)并且步驟(b)的速度决定整个阳极过程的速度.5.确定鋅在氫氧化鉀溶液(浓度大于～1N)中的自动溶解机理为上述阳极过程和氫在鋅上析出的阴极过程組成一对共軛的电化学反应.

1.The stationary potentials of zinc electrode in potassium hydroxide solutions (feom 0.2 N to saturated solution) have been measured.When the concentration of potassium hydroxide is greater than 1 N, the φc～logαKOH plot shows a linear relation, the slope of which is found to be -59 mv.2.The anodic polarization curves of zinc electrode in potassium hydroxide solutions (from 1.07 N to 8.31 N) were measured, the linear portions of which have a slope of 40 mv.It has been found that at constant current densities, when the logαKOH changes by one unit, the anodic potential shifts about 80 mv.