摘要
将挤压态ZK61M镁合金在450℃固溶24 h,然后进行180℃,保温4~10 h时效处理。分别采用析氢法、失重法、电化学测试法研究挤压态、固溶态及不同时间时效处理的镁合金的腐蚀性能。利用光学显微镜与扫描电镜对合金组织、腐蚀产物和腐蚀形貌进行观察,并使用能谱和XRD对其进行物相分析。结果表明,固溶及时效处理改变了ZK61M镁合金组织中第二相的大小与分布,进而提升合金的耐腐蚀性能。在时效4 h时合金晶界处析出颗粒状连续分布的第二相,降低了合金的腐蚀速度,合金耐蚀性能最好。随着时效时间延长,合金中第二相数量增加,并出现非均匀分布的块状、条状析出相,使合金的耐蚀性降低。
The extruded ZK61M magnesium alloy was solid soluted at 450℃for 24 h,and then subjected to 180℃aging treatment for 4~10 h.The corrosion properties of magnesium alloys in extrusion,solution and aging state at different time were investigated by hydrogen evolution method,weight loss method and electrochemical test method.The microstructure,corrosion products and corrosion morphology of the alloy were observed by optical microscope and scanning electron microscope,and phase constituent was analyzed by energy spectrum and XRD.The results indicate that the solution and aging treatment can change the size and distribution of the second phase in the structure of ZK61M magnesium alloy,and then improve the corrosion resistance of the alloy.With the alloy aged for 4 h,the continuous distribution of granular second phase is precipitated at the grain boundary of the alloy,which reduces the corrosion rate and presents the desirable corrosion resistance.With the increase of aging time,the number of the second phase in the alloy is increased,and the uneven distribution of massive and strip precipitates appear,which reduce the corrosion resistance of the alloy.
作者
付广艳
薛丰
张行
周尧
Fu Guangyan;Xue Feng;Zhang Hang;Zhou Yao(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142)
出处
《特种铸造及有色合金》
CAS
北大核心
2024年第3期377-381,共5页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(52201131)。
