冷却速度及铝含量对含Nd的Zn-Al合金组织和耐蚀性的影响

doi:10.11901/1005.3093.2017.243

材料研究学报

2018, Vol. 32

Issue (1): 17-24 DOI: 10.11901/1005.3093.2017.243

研究论文

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冷却速度及铝含量对含Nd的Zn-Al合金组织和耐蚀性的影响

曹祖军, 翁天宇, 孔纲(

), 车淳山, 王彦启

华南理工大学材料科学与工程学院广州 510640

Effect of Cooling Rate and Al-content on Microstructure and Corrosion Resistance of Zn-Al Alloys Containing Trace Nd

Zujun CAO, Tianyu WENG, Gang KONG(

), Chunshan CHE, Yanqi WANG

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

引用本文:

曹祖军, 翁天宇, 孔纲, 车淳山, 王彦启. 冷却速度及铝含量对含Nd的Zn-Al合金组织和耐蚀性的影响[J]. 材料研究学报, 2018, 32(1): 17-24.
Zujun CAO, Tianyu WENG, Gang KONG, Chunshan CHE, Yanqi WANG. Effect of Cooling Rate and Al-content on Microstructure and Corrosion Resistance of Zn-Al Alloys Containing Trace Nd[J]. Chinese Journal of Materials Research, 2018, 32(1): 17-24.

全文: PDF(6866 KB) HTML

摘要:

采用扫描电镜(SEM)和能谱(EDS)分析以及电化学极化和中性盐雾试验(NSS)等手段,研究了Zn-xAl(x=4%, 5%, 7%)-0.06%Nd合金在炉冷,空冷,水冷(冷却速度分别为0.03,1.08和40℃/s)条件下的凝固组织与耐蚀性。结果表明：随着冷却速度的增加,合金组织不断细化,共晶组织的层片间距不断减小,而耐腐蚀性先增大后减小,且稀土Nd的添加有利于进一步减小共晶层片间距和提高合金的耐腐蚀性能。空冷条件下获得的Zn-5%Al-0.06%Nd合金的耐蚀性最佳。Al含量在4%~7%之间变化时,主要引起合金组织的变化,而对合金耐腐蚀性影响不大。

关键词 ：金属材料, 耐蚀性, 极化曲线, 显微组织, 冷却速度, Zn-Al合金

Abstract：

The effect of cooling rate (0.03, 1.08 and 40°C/s) and Al-content on the solidified microstructure and corrosion resistance of Zn-xAl (x=4%, 5%, 7%)-0.06%Nd alloys used for hot-dip galvanizing were examined by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), polarization curves tests and neutral salt spray tests (NSS). The results show that the solidified microstructure of alloys is refined and the eutectic lamellar spacing became smaller as the cooling rate increases, and the corrosion resistance of the alloy increases initially and decreases afterwards with the increase of the cooling rate. Moreover, the addition of Nd can be beneficial to the further reduction of the eutectic lamellar spacing and the improvement of the corrosion resistance of the alloys. Therefore, after air cooling, the Zn-5%Al-0.06%Nd alloy presents the best corrosion resistance. Besides, the variation of Al-content between 4% and 7% caused mainly the change of microstructure, but little effect on the corrosion resistance of the alloys.

Key words： metallic materials corrosion resistance polarization curve microstructure cooling rate Zn-Al alloy

收稿日期: 2017-04-10

ZTFLH:

TG146.1

基金资助:国家自然科学基金 (21573077和51373055),国际铅锌研究组织资助(ILZRO/IZA/CN201212)

作者简介:

作者简介曹祖军,男,1991年生,硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.243 或 https://www.cjmr.org/CN/Y2018/V32/I1/17

图1 Zn-5% Al和Zn-5%Al-0.06%Nd合金以炉冷、空冷和水冷方式冷却至室温时的金相组织

图2 图1a中区域A和区域B的EDS分析结果

图3 合金层片间距与冷却速率间的关系

图4 不同Al含量的Zn-Al合金空冷组织的SEM图像

图5 Zn-5%Al合金凝固示意图

图6 合金试样在3.5%NaCl溶液中的极化曲线

表1 图6中极化曲线的相关参数

图7 不同冷却速度的Zn-5%Al和Zn-5%Al-0.06%Nd合金的NSS结果

图8 不同Al含量的合金的NSS结果

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