摘要
通过浸泡法、动电位极化法、扫描电镜、能谱分析等研究了Zr56Cu19Ni11Al9Nb5非晶合金试样在不同浓度HCl溶液中的腐蚀和电化学性能。浸泡试验结果表明,非晶合金试样分别在0.01、0.1和1mol/L的HCl溶液中浸泡2256h以及在2mol/L HCl溶液中浸泡720h后均未发现明显腐蚀,显示良好的耐腐蚀性。随着HCl溶液浓度进一步增加,非晶合金耐腐蚀性变差。在5mol/L HCl溶液中浸泡168h后腐蚀严重。动电位极化测试表明,随着HCl浓度增加,自腐蚀电位逐渐降低,从0.402V(vs.SCE)逐渐降低到-0.245V(vs.SCE),腐蚀电流密度逐渐增大,从5.212×10-8 A/cm2增加至6.095×10-5 A/cm2,耐腐蚀性逐渐变差,与浸泡试验结果一致。扫描电镜、能谱分析表明腐蚀产物主要为ZrO2、Cu2O等氧化物。
The corrosion and electrochemical properties of Zr56Cu19Ni11Al9Nb5amorphous alloy in various HCl solutions were investigated using immersion tests,potentiodynamic polarization tests,scanning electron microscopy(SEM)and energy dispersive X-ray spectroscopy(EDS).Immersion tests reveal that absence of significant corrosion is observed after immersion in 0.01,0.1and 1mol/L HCl solutions for 2256hand in 2mol/L HCl solution for 720h,presenting the acceptable corrosion resistance.The corrosion resistance is decreased with the increase of HCl concentration,and severe corrosion occurs after immersion in 5 mol/L HCl solution for 168h.Potentiodynamic polarization tests demostrate that the spontaneous corrosion potential Ecorris dropped gradually from 0.402V(vs.SCE)to-0.245V(vs.SCE),with the corrosion current density jcorrincreased gradually from 5.212×10-8A/cm2to 6.095×10-5A/cm2,showing that the corrosion resistance is gradually deteriorated,which is consistent with the result of immersion test.SEM/EDS analysis indicates that the corrosion products are mainly oxides,such as ZrO2and Cu2O.
作者
张志英
孙磊
岳姝敏
余洪良
沈欣
Zhang Zhiying;Sun Lei;Yue Shumin;Yu Hongliang;Shen Xin(School of Materials Science and Engineering,Wuhan University of Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2021年第4期410-415,共6页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51502229)
武汉理工大学博士科研启动基金资助项目(471-40120189)
关键词
非晶合金
腐蚀
电化学性能
动电位极化法
Amorphous Alloy
Corrosion
Electrochemical Properties
Potentiodynamic Polarization Test
