ABSTRACT

The porous Ni-Cr-Mo-Cu alloys were fabricated by an activation reaction sintering technique. The effects of Cr content varied from 10 to 30 wt-% on the corrosion performance of porous alloys in 10 wt-% H₂SO₄ solution were evaluated using weight-loss method and electrochemical techniques. The structural morphology, phase constitution and elemental distribution were characterized by scanning electron microscopy (SEM), X-Ray diffraction analysis, energy dispersive spectrometer and X-ray photoelectron spectroscopy (XPS). The results indicate that porous Ni-Cr-Mo-Cu alloys possess excellent corrosion performance. With incremental changes in Cr contents, the anticorrosion ability increases as well. Electrochemical measurements illustrate results similar to that of weight-loss method, with the increment of Cr content, the double capacitive loops for the porous alloy increases as well, which illustrate that the corrosion procedure is controllable by electrochemical reaction. Moreover, the charge transfer resistance of Ni30wt-%Cr10wt-%Mo5wt-%Cu is 49.2 times bigger than that of Ni10wt-%Cr10wt-%Mo5wt-%Cu. And the corrosion mechanism was explored by XPS.

摘要

采用活化反应烧结技术制备多孔Ni-Cr-Mo-Cu合金。Cr含量从10到30 wt-%对多孔合金在10 wt-% H ₂ SO _{4 中}的腐蚀性能的影响使用失重法和电化学技术评估溶液。通过扫描电子显微镜 (SEM)、X 射线衍射分析、能谱仪和 X 射线光电子能谱 (XPS) 对结构形貌、相组成和元素分布进行了表征。结果表明多孔Ni-Cr-Mo-Cu合金具有优异的耐腐蚀性能。随着Cr含量的增加，防腐能力也随之提高。电化学测量结果与失重法相似，随着Cr含量的增加，多孔合金的双电容回路也增加，表明腐蚀过程是由电化学反应控制的。此外，Ni30wt-%Cr10wt-%Mo5wt-%Cu的电荷转移电阻为49。比Ni10wt-%Cr10wt-%Mo5wt-%Cu大2倍。并通过XPS探索了腐蚀机制。