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本文提出用电化学原理测定碳化物导电体在电解质溶液中形成双层电容C_d值大小来评定其弥散度。通过对电极过程的等效电路分析,阐明用DHZ-1型电化学综合测试仪的溶液补偿功能,如何以三角波电位脉冲信号去测定碳化物C_d的方法,然后根据导电体比电容换算因子值(20μF/cm~2)求出其比表面积S值(m~2/g)大小,从而完成钢中碳化物弥散度的电化学评定。当控制恒电流对钢试样分次短时间电解腐蚀,暴露出碳化物后立即测定C_d值,并作出C_d-t曲线,发现C_d与t属线性关系。对其C_d-t直线出现转折点的物理意义在文中作了讨论。
In this paper, the electrochemical principle is used to determine the value of C_d of double-layer capacitor formed by carbide conductor in electrolyte solution to evaluate its dispersion. Through the equivalent circuit analysis of the electrode process, the solution of the DHZ-1 electrochemical tester solution compensation function, how to use the triangular wave potential pulse signal to determine the method of carbide C_d, and then based on the specific capacitance conversion factor ( 20μF / cm ~ 2) to obtain the size of the specific surface area S (m ~ 2 / g), thus completing the electrochemical evaluation of the carbide dispersion in the steel. When the control of galvanostatic corrosion of steel samples sub-short time electrolytic corrosion, measured immediately after the determination of C_d value C_d-t curve and found C_d and t is a linear relationship. The physical meaning of the turning point of C_d-t line is discussed in this paper.