机械合金化制备的纳米Ag-25Cu合金在Na_2SO_4溶液中腐蚀电化学行为  

Corrosion Electrochemical Behavior of Nanocrystalline Ag-25Cu Alloy Prepared by Mechanical Alloying Method in Na_2SO_4 Solution

作　　者：尹晓桐 贾中秋 安然[1] 刘秀[1] 曹中秋[1] 

机构地区：[1]沈阳师范大学化学与生命科学学院,辽宁沈阳110034

出　　处：《辽宁化工》2016年第4期416-418,共3页Liaoning Chemical Industry

摘　　要：通过控制球磨时间制备粗晶Ag-25Cu合金粉末和纳米Ag-25Cu合金粉末,采用真空热压法制备出纳米晶Ag-25Cu块体合金,对比研究不同晶粒尺寸的Ag-25Cu合金的化学稳定性。通过PAR273与5210电化学工作站测定Ag-25Cu合金在中性Na2SO4溶液中动电位极化曲线和交流阻抗谱等研究了晶粒尺寸对其腐蚀电化学行为的影响。由动电位极化曲线可以看出在中性Na2SO4溶液中,两种Ag-25Cu合金均发生活性溶解,且机械合金化法制备的纳米Ag-25Cu合金得腐蚀电流密度明显大于粗晶Ag-25Cu合金;从阻抗谱中可以看出两种工艺的合金均呈现单容抗弧,且粗晶Ag-25Cu合金的容抗弧曲率半径大于机械合金化法制备的纳米晶Ag-25Cu合金的曲率半径。Nanocrystalline Ag-25 Cu alloy powders were prepared by mechanical alloying method. Then Ag-25 Cu alloyed bulk was prepared through hot pressing. The corrosion electrochemical behavior of nanocrystalline bulk Ag-25 Cu alloy in Na2SO4 solution was studied by means of PAR273 A and M5210 electrochemical synthesis test system through potentiodynamic polarization curves and electrochemical impedance spectroscopies（El S） technique. The results show that nanocrystalline Ag-25 Cu alloys prepared by difference method are active dissolution in Na2SO4 solution. The corrosion current density of nanocrystalline Ag-25 Cu alloy is bigger than that of coarse grained Ag-25 Cu alloy. The corrosion rate becomes faster with decreasing of the grain size. EIS plots of two Ag-25 Cu alloys are composed of capacitance arc at high frequency ranges. The capacitance arc radius of coarse grained Ag-25 Cu alloyed bulk is bigger than the capacitance arc radius of nanocrystalline Ag-25 Cu alloyed powders.

关 键 词：机械合金化 电化学腐蚀 极化曲线 交流阻抗谱 

分 类 号：TQ113.23[化学工程—无机化工]