Ti对Zn-5Al合金组织及耐腐蚀性能的影响

doi:10.11902/1005.4537.2013.206

中国腐蚀与防护学报

2014, Vol. 34

Issue (6): 515-522 DOI: 10.11902/1005.4537.2013.206

本期目录 | 过刊浏览

Ti对Zn-5Al合金组织及耐腐蚀性能的影响

刘子利(

), 刘希琴, 王怀涛, 胡金东, 侯志国

南京航空航天大学材料科学与技术学院南京 210016

Effect of Ti Addition on Microstructure and Corrosion Property of Zn-5Al Alloy

LIU Zili(

), LIU Xiqin, WANG Huaitao, HU Jindong, HOU Zhiguo

College of Materials Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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摘要:

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Al-Ti-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0.85 μgcm^-²d^-¹和1.403 μA/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。

关键词 ： Ti, Zn-5Al合金, 腐蚀性能

Abstract：

The microstructure and corrosion properties of Zn-5Al-xTi alloy have been investigated by OM, SEM, EDS and electrochemical tests etc. The results show that a small amount of Ti addition in Zn-5Al alloy refines the primary β-Zn phase and increases the percentage of the eutectic structure. With the addition of 0.15%Ti, almost all β-Zn phase disappears in the Zn-5Al-0.15Ti alloy and therewith which exhibits an entire eutectic microstructure. With increasing the Ti content to 0.2%, a new Al-Ti-Zn ternary phase appears in the alloy. The addition of Ti increases the corrosion resistance of Zn-5Al alloy. Among others, the corrosion rate and corrosion current density of Zn-5Al-0.15Ti alloy reach a minimum of 0.85 μgcm^-²d^-¹ and 1.403 μA/cm² respectively, while the impedance at high frequency or the diffusion impedance at low frequency all reach a maximum. Uniform corrosion occurs for the Zn-5Al-0.15Ti alloy with entire eutectic microstructure.

Key words： Ti Zn-5Al alloy corrosion property

ZTFLH:

TG174

基金资助:江苏省研究生工作站项目资助

作者简介: null

刘子利，男，1968年生，教授，博士，研究方向为金属材料及其精密成形技术

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引用本文:

刘子利, 刘希琴, 王怀涛, 胡金东, 侯志国. Ti对Zn-5Al合金组织及耐腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2014, 34(6): 515-522.
Zili LIU, Xiqin LIU, Huaitao WANG, Jindong HU, Zhiguo HOU. Effect of Ti Addition on Microstructure and Corrosion Property of Zn-5Al Alloy. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 515-522.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.206 或 https://www.jcscp.org/CN/Y2014/V34/I6/515

表1 Zn-Al合金的化学成分

图1 Zn-5Al-xTi合金的显微组织

图2 Zn-5Al-0.2Ti合金的SEM像与EDS结果

图3 Zn-5Al-xTi合金的腐蚀速率

图4 Zn-5Al-xTi合金在3.5%NaCl溶液中自腐蚀电位Ecorr随时间的变化

图5 Zn-5Al-xTi合金在3.5%NaCl溶液中的极化曲线

表2 极化曲线经Tafel拟合得到的Icorr, ba 和 bc值

图6 Zn-5Al-xTi合金在3.5%NaCl溶液中浸泡不同时间的Nyquist图

图7 Zn-5Al-xTi合金在3.5%NaCl溶液中浸泡时阻抗值RH随时间的变化曲线

图8 Zn-5Al-xTi合金在3.5%NaCl溶液中浸泡不同时间后的Y0值

图9 4种合金在3.5%NaCl溶液中静置不同时间后的腐蚀形貌

图10 Zn-5Al-xTi合金在3.5%NaCl溶液中浸泡480 h后表面的SEM像

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