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用电位线扫描对玻美度为３０°Ｂé的三氯化铁溶液中的ＦｅＮｉ４２和Ｐｔ工作电极进行阴极极化。ＦｅＮｉ４２的蚀刻过程由溶液中Ｆｅ３＋向合金界面的扩散传质控制，其蚀刻电流与还原步骤的极限扩散电流相等。应用Ｐｔ工作电极的动电位阴极极化可以对合金的蚀刻电流密度进行衡量。快速电位扫描获得的Ｐｔ电极极化曲线上有波峰出现，相应于溶液中Ｆｅ３＋还原为Ｆｅ２＋。波峰缩短了极限电流平台区，成为利用快扫描获得合金蚀刻电流密度的限制性因素。ＦｅＮｉ４２自身的阴极极化曲线上也有波峰和曲线转折，相应于合金表面的金属再沉积。不能利用ＦｅＮｉ４２电极通过快速电位扫描获得其蚀刻电流密度值。
Cathode polarization was performed on the FeNi42 and Pt working electrodes in a ferric chloride solution of glassy degree 30 ° Bé by potentiometric line scanning. The etching process of FeNi42 is controlled by the diffusion and mass transfer of Fe3 + in the solution to the alloy interface, and the etching current is equal to the limit diffusion current in the reduction step. Potentiostatic cathodic polarization of Pt working electrode can be used to measure the etching current density of the alloy. The peak on the polarization curve of Pt electrode obtained by fast potential scanning appears, which corresponds to the reduction of Fe3 + to Fe2 + in solution. Peaks shorten the area of the limiting current platform and become a limiting factor in obtaining the alloy etch current density using fast scanning. FeNi42 itself has a crest curve and a curved transition on its cathode polarization curve, corresponding to the metal redeposition on the alloy surface. Can not use FeNi42 electrode fast potential scan to obtain the value of the etching current density.