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利用动电位极化曲线、电化学阻抗谱图等电化学测试手段,探究了用粉末冶金法制备的常规尺寸Fe-50Cu合金、机械合金化法和液相还原法制备的纳米晶Fe-50Cu合金在0.05 mol/L硫酸钠溶液中的腐蚀行为。研究表明,三种方法制备的Fe-50Cu合金的自腐蚀电位随时间的变化幅度很小,基本保持不变。从动电位极化曲线来看,三种方法制备的合金都发生活性溶解现象,机械合金化法制备的Fe-50Cu合金腐蚀电流密度最大,腐蚀速度最快。从交流阻抗谱可知,三种均为单容抗弧,且液相还原法制备的Fe-50Cu合金的电荷传递电阻最小。三种方法比较得知液相还原法制备的合金耐腐蚀性好。
Electrochemical measurements such as potentiodynamic polarization curve and electrochemical impedance spectroscopy were used to investigate the effects of the conventional Fe-50Cu alloy prepared by powder metallurgy, the mechanical alloying method and the nanocrystalline Fe-50Cu alloy prepared by liquid reduction Corrosion behavior in 0.05 mol / L sodium sulfate solution. The results show that the corrosion potential of Fe-50Cu alloy prepared by the three methods changes little with time and remains basically unchanged. From the kinetic potential polarization curve, all three alloys prepared by active dissolution phenomenon, the mechanical alloying Fe-50Cu alloy corrosion current density of the largest, the fastest corrosion. AC impedance spectroscopy shows that the three types are single capacitive arc, and the liquid-phase reduction prepared Fe-50Cu alloy charge transfer resistance of the smallest. Comparison of the three methods that liquid phase reduction prepared alloy corrosion resistance.