机械合金化制备的纳米晶Ag-25Ni合金在H_2SO_4溶液中腐蚀电化学行为研究  

Study on Corrosion Behavior of Nanocrystalline Ag-25Ni Bulk Alloys Prepared by Mechanical Alloying Process in H_2SO_4 Solution

作　　者：贾中秋 崔田路 刘秀[1] 尹晓桐 曹中秋[1] 

机构地区：[1]沈阳师范大学化学化工学院,辽宁沈阳110034

出　　处：《辽宁化工》2016年第11期1368-1370,共3页Liaoning Chemical Industry

摘　　要：通过机械合金化法通过控制球磨机球磨时间分别制备出纳米晶(Nanocystalline,简化NC)和常规尺寸(Coarse grained,简化CG)Ag-25Ni合金粉末,利用真空热压法将粉末压成块体,通过电化学工作站研究两种不同尺寸Ag-25Ni块体合金在0.02mol/L H_2SO_4溶液中的腐蚀电化学行为。由动电位极化曲线可以看出,两种Ag-25Ni合金均发生活性溶解,且纳米晶NC Ag-25Ni合金的腐蚀电流密度明显小于常规尺寸CG Ag-25Ni合金;从交流阻抗谱可以看出,纳米晶NCAg-25Ni合金的曲率半径明显大于常规尺寸CGAg-25Ni合金,NCAg-25Ni合金电子传递电荷电阻大于CGAg-25Ni。可见,纳米化后,Ag-25Ni合金耐蚀性能提高。Nanocrystalline（NC） and coarse grained（CG） Ag-25 Nialloyed powders were obtained by mechanical alloying methods through controlling milling time. Bulk Ag-25 Nialloy were prepared by vacuum hot pressing technique. The effect of grain size on the corrosion behavior of bulk Ag-25 Nialloys in 0.02 mol/L H_2SO_4 solution was studied by electrochemical workstation. The dynamic potential polarization curve showed that two Ag-25 Nialloys were all dissolved. The corrosion current density of NC Ag-25 Nialloy was significantly less than that of CG Ag-25 Nialloy. The electrochemical impedance spectroscopy showed that the radius of curves of NC Ag-25 Nialloy was significantly higher than that of CG Ag-25 Nialloy. The charge transfer resistance of NC Ag-25 Nialloy was greater than that of CG Ag-25 Nialloy. Thus, the corrosion resistance of NC Ag-25 Nialloy was better.

关 键 词：机械合金化法 纳米晶 动电位极化曲线 交流阻抗谱 

分 类 号：O621[理学—有机化学]