Cu_(48)Zr_(43)Al_9合金在0.05mol/L Na_2SO_4介质中腐蚀电化学行为研究  

On corrosion electrochemical behaviors of Cu_(48)Zr_(43)Al_9 alloys in 0.05mol/L Na_2SO_4 solution

作　　者：张媛[1] 曹中秋[1] 张彤丹[1] 鲁捷[1] 

机构地区：[1]沈阳师范大学化学与生命科学学院,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2012年第1期90-93,共4页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(50771068);沈阳师范大学实验中心主任基金资助项目(SY200702)

摘　　要：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。The crystal alloy of Cu48Zr43 AI9 is prepared in an arc furnace and the corresponding amorphous alloy is prepared in a copper mould cylindrical rods. Electrochemical corrosion behaviors of Cu48Zr43 A19 alloys in Na2 SO4 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.

关 键 词：Cu48Zr43Al9合金 晶态合金 非晶态合金 电化学腐蚀 

分 类 号：TG174.3[金属学及工艺—金属表面处理]