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与电解液接触时金属材料所呈现的极化阻力已大量用于评定其腐蚀速率。极化阻力的实验值往往是通过电压三角扫描技术绘出静态电压附近的极化曲线再予以确定的。据发现,腐蚀抗力高的材料,其极化阻力值主要取决于扫描速度即扫描循环的周期。若用一个电阻和一个电容并联的电路表示腐蚀电极的等效电路,则极化阻力的这种相关性就全然不能予以解释了。事实上,虽然按照R-C并联电路在宽的频率范围内测得的腐蚀电极阻抗可绘成复杂平面内的一条电容弧线,但是R和C的值均取决于频率。本研究采用实验测定的电极阻抗值,通过Heaviside运算微积分法定量计算了对于电压三角扫描信号的电流反响。己发现,对于不同周期的电压三角扫描信号,实验测得的和计算所得的电流-电压循环曲线很吻合。
The polarization resistance exhibited by metallic materials when in contact with electrolytes has been extensively used to assess their corrosion rate. The experimental values of the polarization resistance are often determined by the voltage triangle scanning technique to plot the polarization curve near the static voltage. It was found that the material with high corrosion resistance, the polarization resistance value depends mainly on the scanning speed that is the cycle of the scan cycle. If a resistor and a capacitor parallel circuit is used to represent the equivalent circuit of the corrosion electrode, the polarization resistance of this correlation can not be explained at all. In fact, while the corrosion electrode impedance measured over a wide frequency range by the R-C shunt circuit can be plotted as a single capacitor arc in a complex plane, the values of R and C depend on the frequency. In this study, we measured the electrode impedance value experimentally, and the current response to the voltage triangle scanning signal was quantitatively calculated by Heaviside calculus method. It has been found that the experimentally measured and calculated current-voltage cycling curves are in good agreement with the voltage triangle sweep signals of different periods.