一、前言用线性极化和充电曲线这两种电化学方法评定电镀层的耐蚀性,不但要体现快速、灵敏的特点,而且还要重现性好、可靠。这就要求测试技术上有所保证。从理论上说,只要腐蚀过程稍有变化,表征腐蚀过程的电化学参量也就随之发生变化,这可以采用灵敏的电子仪器准确地测量出来,并通过理论方程式和金属的腐蚀速度联系起来,为快速评定金属的耐蚀性提供了依据。这两种电化学测试方法都采用弱极化技术,因此在不干扰腐蚀体系、不改变金属表面 First, the foreword With linear polarization and charging curves of these two electrochemical methods to evaluate the corrosion resistance of the plating layer, not only to reflect the fast, sensitive features, but also reproducibility is good and reliable. This requires testing of technical assurance. In theory, as long as the corrosion process changes slightly, the electrochemical parameters that characterize the corrosion process also change, which can be accurately measured using sensitive electronic instrumentation and linked to the corrosion rate of the metal by theoretical equations, Provides a basis for rapid assessment of metal corrosion resistance. Both of these electrochemical test methods use weak polarization techniques so that without disturbing the corrosion system and without changing the metal surface