(1. 河南科技大學(xué) 材料科學(xué)與工程學(xué)院，洛陽(yáng) 471023；
2. 河南省有色金屬共性技術(shù)協(xié)同創(chuàng)新中心，洛陽(yáng) 471023)
摘 要: 采用掃描電鏡(SEM)、X射線衍射(XRD)、動(dòng)電位極化、電化學(xué)阻抗等方法研究了Ce含量對(duì)Al-7Zn-0.1Sn(質(zhì)量分?jǐn)?shù)，%)合金顯微組織和電化學(xué)性能的影響。結(jié)果表明：Ce可明顯細(xì)化晶粒，使Al-7Zn-0.1Sn合金從粗大枝狀晶向細(xì)小等軸晶轉(zhuǎn)變；適量的Ce可有效改善Al-7Zn-0.1Sn合金的電化學(xué)性能；隨著Ce含量增加，合金電位負(fù)移、電流效率逐步提高；當(dāng)Ce含量(質(zhì)量分?jǐn)?shù))為0.5%時(shí)，合金具有最好的電化學(xué)性能，其電流效率相比Al-7Zn-0.1Sn 合金的提高10%。
關(guān)鍵字: 犧牲陽(yáng)極；鈰；顯微組織；電化學(xué)性能
（1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;
2. Henan Synergistic Innovation Center of Nonferrous Metal Generic Technology, Luoyang 471023, China）
Abstract:The effects of cerium content on the microstructure and electrochemical performance of Al-7Zn-0.1Sn (mass fraction, %) alloy were investigated by scanning electron microscopy (SEM), X-ray diffractometry (XRD), potentiodynamic polarization and electrochemical impedance spectra measurements. The results show that cerium can refine the crystalline structure and make the microstructure of Al-7Zn-0.1Sn alloy transform from bulky dendrite grain to fine equiaxed grain. Proper cerium addition is effective on improving the electrochemical properties of Al-7Zn-0.1Sn alloy. The corrosion potential shifts negatively and the current efficiency increases with increasing the cerium content. The optimal electrochemical performance can be obtained when the Ce content in the alloy is 0.5%. The current efficiency of the Al-7Zn-0.1Sn-0.5Ce alloy increases by 10% than that of Al-7Zn-0.1Sn alloy.
Key words: sacrificial anode; cerium; microstructure; electrochemical performance
