极化曲线测量电力设备镀锌部件腐蚀速率及其参数优化

Polarization Curve Measurement of Corrosion Rate of Hot-dipped Component in Transmission Equipment and Parameter Optimization

采用Tafel曲线、线性极化和弱极化曲线方法测量了锌在3.5%NaCl溶液中的腐蚀速率。通过试验对3种测量方法所得结果作了对比分析,考察了扫描速率和扫描范围对极化曲线测量锌腐蚀速率的影响。结果表明,由于锌的电化学特征,采用线性极化和Tafel曲线测量所得结果精密度较低,而采用弱极化曲线测量可得到较满意的结果;扫描速率过大或过小都会对测量结果产生较大的误差。而扫描范围的大小也对测量结果有很大的影响。

The corrosion rate of zinc in 3. 5 NaC1 solution was measured by Tafel, linear polarization and weak polarization curve method. The measured results were analyzed and compared in detail by calculating the standard deviation. The effects of scan rate and scan range on the measurement of corrosion rate were investigated. The results show that the corrosion rate of zinc can be obtained by weak polarization curve method with lower standard deviation, while Tafel and linear polarization curve method always bring larger error. The effects of scan rate and scan range on the precision of measurement were also analyzed in this paper.