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采用金相观察、电化学性能测试、SEM和EDS分析等方法研究了Ti对Zn-5Al合金的组织及耐蚀性能的影响。结果表明:在Zn-5Al合金中加入Ti可细化枝状的β-Zn相,增大共晶组织含量。当Ti含量为0.15%时,初生β-Zn相完全消失,Zn-5Al合金为全共晶组织组成,随着Ti含量进一步升高到0.2%,合金中出现了块状的AlTi-Zn三元相。添加Ti提高了Zn-5Al合金的耐蚀性能,Zn-5Al-0.15Ti合金的腐蚀速率和自腐蚀电流密度均最小,分别为0.85μg·cm-2·d-1和1.403μA/cm2,且其高频阻抗和低频扩散阻抗均最大。全共晶组织的Zn-5Al-0.15Ti合金发生的是均匀性腐蚀。
The effects of Ti on the microstructure and corrosion resistance of Zn-5Al alloy were investigated by metallographic observation, electrochemical test, SEM and EDS analysis. The results show that adding Ti into the Zn-5Al alloy can refine the dendritic β-Zn phase and increase the eutectic structure. When the content of Ti is 0.15%, the primary β-Zn phase completely disappears and the Zn-5Al alloy is a eutectic structure. With the further increase of Ti content to 0.2%, the bulk AlTi-Zn ternary phase. The addition of Ti improves the corrosion resistance of Zn-5Al alloy. The corrosion rate and self-corrosion current density of Zn-5Al-0.15Ti alloy are the smallest, 0.85μg · cm-2 · d-1 and 1.403μA / cm2 respectively, Its high frequency impedance and low frequency diffusion impedance are the largest. The homo-eutectic Zn-5Al-0.15Ti alloy is homogeneously etched.