论文部分内容阅读
利用恒电流充电曲线法和动电位极化曲线法研究了KOH和Zn(OH)_4~(2-)浓度、温度等因素对锌电极惰化的影响.对于充电曲线的测取,设计了一个电极表面向上并加套管的装置,借以控制电解液的对流.所得的的关系,符合如下的扩散方程式:几组曲线均由斜率不同的两条直线组成,在低电流密度范围内,i=0,直线通过坐标原点;在高电流密度下,i_1≠0. 动电位极化曲线的结果表明,惰化电位(?)p与ln a_(oH-)符合如下的线性关系:由此进一步验证了锌氧化物的化学溶解过程是惰化的控制步骤. 实验结果表明,在对流几乎不存在和低电流密度下,惰化受Zn(OH)_4~(2-)扩散所控制,由过饱和的Zn(OH)_4~(2-)溶液中析出成相膜而引起惰化.在高电流密度下,除上述因素外,还可由电化学反应直接形成表面惰化层.
The effects of KOH and Zn (OH) _4 ~ (2-) concentration and temperature on the inerting of zinc electrode were studied by means of galvanostatic charge curve and potentiodynamic polarization curve. For the determination of charging curve, a The surface of the electrode is upwardly and cannulated to control the convection of the electrolyte.The resulting relationship is in accordance with the following diffusion equation: Each of the sets of curves consists of two straight lines with different slopes. At low current densities, i = 0, the straight line passes through the origin of the coordinates, and at high current densities i_1 ≠ 0. The results of the potentiodynamic polarization curves show that the inertial potentials (p) and ln a_ (oH-) satisfy the following linear relationship: From this, The chemical dissolution process of zinc oxide is a control step of inertization.The experimental results show that the inerting is controlled by the diffusion of Zn (OH) 4 ~ (2-) under the condition of almost nonexistent convection and low current density, Of Zn (OH) _4 ~ (2-) solution precipitated into the phase film and caused by inertia.In high current density, in addition to the above factors, but also by electrochemical reaction directly to form the surface of the inert layer.