Cu48Zr43Al9合金在0.05mol/L Na2SO4介质中腐蚀电化学行为研究

采用真空电弧熔炼法制备Cu48Zr43Al9晶态合金及铜模铸造法制备Cu48Zr43Al9非晶合金。通过极化曲线和交流阻抗谱技术研究了Cu48Zr43Al9晶态和非晶态合金在0.05 mol/LNa2SO4溶液中腐蚀电化学行为。结果表明,在0.05 mol/LNa2SO4溶液中,Cu48Zr43Al9晶态和非晶态合金的交流阻抗谱均呈单容抗弧,实验结果说明合金的腐蚀过程是由电化学控制。与非晶合金相比,腐蚀电位负移,晶态合金的电荷传递电阻减小,腐蚀电流密度变大,腐蚀速度加快。在0.05mol/LNa2SO4溶液中,Cu48Zr43Al9非晶态合金具有良好的耐腐蚀性能,这是因为非晶态合金不具有晶格缺陷,结构均一稳定。

On corrosion electrochemical behaviors of Cu48Zr43Al9 alloys in 0.05mol/L Na2SO4 solution

The crystal alloy of Cu48Zr43Al9 is prepared in an arc furnace and the corresponding amorphous alloy is prepared in a copper mould cylindrical rods.Electrochemical corrosion behaviors of Cu48Zr43Al9 alloys in Na2SO4 solution were studied by potentiodynamic polarization method and electrochemical impedance spectroscopy(EIS) technique.The results show that electrochemical impedance spectroscopy of the two alloys are both made of single capacitive loop.This shows that the processes of alloy corrosion are controlled by electrochemistry.The corresponding crystal alloy has lower charge transfer resistance,higher current densities and corrosion potentials move to the negative direction compared with the amorphous alloy.Therefore,corrosion rates of the alloy become faster.The amorphous alloy has stronger corrosion resistance than the corresponding crystal alloy because it has no lattice defects but has uniform and stable composition.