FeCo基大块非晶合金盐雾与电化学腐蚀研究

Research on salt spray and electrochemical corrosion of FeCo-based bulk amorphous alloys

摘要:

通过电化学测试方法与中性盐雾腐蚀实验研究Fe24 xCo24-xCr15Mo14C15B6Y2 (X=0, 2, 4, 6, 17)块体非晶合金的耐蚀性。合金在1 mol/L HCl中出现了宽的钝化区，其EIS图谱均由单一容抗弧组成，显示出良好耐蚀性；结合极化曲线与交流阻抗结果分析可得合金耐蚀性随着Co含量的增加先增大后减小，当Co含量为20%时合金耐蚀性最好。利用能谱分析(EDS)与原子力显微镜(AFM)对合金的中性盐雾腐蚀结果进行分析，可知它们的腐蚀产物主要由铁和钴的氧化物以及它们的氯化物组成。同时FeCo基大块非晶合金腐蚀程度随着Co含量的变化而变化，其盐雾腐蚀耐蚀性规律与电化学腐蚀耐蚀性规律一致。

Abstract:

The corrosion resistance of Fe24 xCo24-xCr15Mo14C15B6Y2 (X=0, 2, 4, 6, 17) bulk amorphous alloy was investigated by electrochemical test methods and neutral salt spray experiment, respectively. The alloy formed wide passivation zone in 1mol/L HCl, its EIS spectra was composed of a single capacitive loop, which showing a good corrosion resistance. Combined with the results of polarization curves and AC impedance analysis, it can be obtained that the corrosion resistance of the alloy increases first and then decreases with the increasing of Co content. It gets the best corrosion resistance when the Co content of 20%. Using spectroscopy (EDS) and atomic force microscopy (AFM) to analyze the salt spray result, it can be known that the corrosion products mainly composed of iron and cobalt oxides and their chlorides. Meanwhile, FeCo-based bulk amorphous alloy corrosion degree was changed with Co content varied, and its salt spray corrosion resistance rule is consistent with electrochemical corrosion resistance rule.