Liang Wu, Xiaona Li, Ge Yang, Zhi Tang, Xiaohua Guo, Yang Xu, Yifeng Xiao, Jinwen Qian, Yanfei Xu, Yuehui He
November 29, 2018
Ni–Cr–Fe alloy samples with different porosities were prepared via the Kirkendall effect, with a reactive synthesis of Ni, Cr, and Fe elemental powders. The microstructure, surface morphology and the compositions were analyzed with X-ray diffraction and scanning electron microscopy. The corrosion behavior was explored in a 2 mol L −1 KOH solution using electrochemical methods and an immersion test. The polarization resistance indicated that the free corrosion potential and the lower corrosion current of the porous Ni–Cr–Fe alloy were −0.18528 V and 3.5998 × 10 −7 A cm −2 . The immersion test showed that after 25 days of immersion, the weight change of porous Ni–Cr–Fe alloy was 0.132 %, which was less than the porous Ni (0.346 %). X-ray photoelectron spectroscopy results revealed the corrosion products of the porous Ni–Cr–Fe alloy and the porous Ni. The corrosion mechanism of the porous Ni–Cr–Fe alloy was discussed.