摘要
采用腐蚀形貌观察、动电位极化测试、电化学阻抗谱与腐蚀速度测试等方法系统地研究了高能电脉冲处理(EPT)和传统热处理(CHT)的电轧AZ31镁合金带材在3.5%NaCl(质量分数)溶液中的腐蚀行为。结果表明:高能电脉冲处理和传统热处理都能提高电轧AZ31镁合金的耐腐蚀性能,因为处理后的镁合金发生再结晶,位错密度降低;高能电脉冲处理与传统热处理相比,能更加显著地提高材料的综合力学性能,但是在改善材料耐腐蚀性能方面并不具有优势,这可能与高能电脉冲处理形成的更细小晶粒所形成更多的腐蚀微电池有关。
The corrosion behavior of electroplastic rolled (ER) AZ31 magnesium alloys subjected to high energy electric pulse treating (EPT) and conventional heat treating (CHT) respectively in 3.5%NaCl solution (mass fraction) were investigated using potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), corrosion morphology observation and corrosion rate measurement. The results indicate that the corrosion resistance of the as-ER alloys is enhanced by EPT or CHT, which is attributed to complete recrystallization and lower dislocation density after treatments. Compared with CHT, the EPT process can increase mechanical properties of materials more significantly, but it is not good at the corrosion resistance improvement, which may result from more corrosion micro-cells caused by finer grains.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第11期1997-2002,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金项目(50571048)
