1993 Volume 42 Issue 2 Pages 93-98
Corrosion states of stainless steels in chloride solutions were observed by a voltammetry using random potential pulses, which is called the random pulse method. Step signals of 512 random potential were applied to a specimen, and the current responses to these potentials were arranged in a 8 by 8 matrix. Thus a three-dimensional voltammogram was obtained. Voltammograms showed characteristic shapes depending on the corrosion states of steel surfaces. The slope of the voltammogram and the polarization resistance reflected the corrosion susceptibility of materials. The variation of the voltammograms with time corresponds to the change of corrosion state of steels. The random pulse method could be recognized as a useful tool to monitor the corrosion states of stainless steels.