摘要
采用SEM、EDS、电化学测试等方法研究了热浸镀用Zn-5Al-xMn(x=0,0.1,0.2,0.3)合金的铸态组织与耐蚀性能。结果表明:在Zn-5Al合金中加入少量的Mn显著抑制了粗大初生β-Zn相的生成,当Mn含量为0.2%时,初生β-Zn相最少,共晶组织占比最高。试验合金的自腐蚀电位随着Mn含量的提高而增大,自腐蚀电流密度先减小后增大。Zn-5Al-0.2Mn合金自腐蚀电流最小为1.403μA/cm^2,其高频阻抗和低频扩散阻抗均最大。Zn-5Al合金中初生β-Zn相优先腐蚀,Zn-5Al-0.2Mn合金因初生β-Zn相较少,发生均匀性腐蚀,其腐蚀产物在Zn-5Al-xMn合金中最致密。
The microstructure and corrosion behavior of the as-cast hot-dip Zn-5Al-xMn(x=0,0.1,0.2,0.3) alloys have been investigated by SEM,EDS,electrochemical test techniques,etc. The results indicate that a small addition of Mn in as-cast Zn-5Al alloy can greatly inhibit the formation of primary β-Zn phase. When the Mn addition is 0.2%(in mass),the amount of β- Zn phase is the least and the percentage of eutectic composition reaches the maximum. The corrosion potential of the tested alloy moves positive direction,while the corrosion current density decreases first and then increases as increasing of Mn addition. The corrosion current density of the Zn - 5Al - 0.2Mn alloy has the minimum value of 1.403 μ A / cm^2 ,with which the impedance spectra at both high and low frequencies reach the maximum. The primary β-Zn phase is corroded preferentially in Zn-5Al alloy,but uniform corrosion happens in Zn-5Al-0.2Mn alloy for little amount of β-Zn phase. The corrosion products of Zn-5Al-0.2Mn is the most compact in the Zn-5Al-xMn alloys.
作者
崔军
刘子利
刘希琴
王怀涛
CUI Jun;LIU Zili;LIU Xiqin;WANG Huaitao(Changshu Switch Manufacturing Co Ltd,Changshu,215500,China;College of Materials Science and Engineering,Nanjing University of Aeronautics & Astronautics,Nanjing,211106,China)
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2019年第1期117-123,共7页
Journal of Nanjing University of Aeronautics & Astronautics
作者简介
通信作者:崔军,女,工程师,E-mail:1535686840@qq.com.
