东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2013, Vol. 34 ›› Issue (8): 1136-1139.DOI: -

• 材料与冶金 • 上一篇    下一篇

Mg对Galvalume镀层微观结构、耐蚀性和成形性的影响

李世伟，高波，涂赣峰，朱广林   

  1. (东北大学材料与冶金学院，辽宁沈阳110819)
  • 收稿日期:2013-04-06 修回日期:2013-04-06 出版日期:2013-08-15 发布日期:2013-03-22
  • 通讯作者: 李世伟
  • 作者简介:李世伟(1984-)，男，河南漯河人，东北大学博士研究生；涂赣峰(1964-)，男，江西萍乡人，东北大学教授，博士生导师.
  • 基金资助:
    辽宁省高等学校优秀人才支持计划项目(LJQ2012021)；沈阳市科技计划项目(F12-277-1-55).

Effects of Mg on the Microstructure， Corrosion Resistance and Formability of Galvalume Coatings

LI Shiwei， GAO Bo， TU Ganfeng， ZHU Guanglin   

  1. School of Materials & Metallurgy， Northeastern University， Shenyang 110819， China.
  • Received:2013-04-06 Revised:2013-04-06 Online:2013-08-15 Published:2013-03-22
  • Contact: GAO Bo
  • About author:-
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摘要： 利用扫描电镜、X射线衍射仪、电化学测试和杯突试验研究了Mg(质量分数15%)对Galvalume(Zn-55Al-16Si)镀层微观结构、耐蚀性和成形性的影响.扫描电镜和X射线衍射仪检测结果显示，添加Mg后在Zn-55Al-16Si-15Mg镀层的枝晶间区出现了MgZn2相；腐蚀产物的微观形貌显示Mg能减少镀层腐蚀产物中的裂纹，并提高其致密性.电化学检测结果显示，Zn-55Al-16Si-15Mg镀层的腐蚀速度仅为Galvalume的341%，因此Mg能显著地提高Galvalume镀层的耐蚀性；MgZn2作为强化相，强化了镀层的枝晶间区，减少了成形杯弯曲外表面的微裂纹，显著地提高了Galvalume镀层的成形性.

关键词: Galvalume镀层, 微观结构, 耐蚀性, 成形性

Abstract: By means of scanning electronic microscopy (SEM)， Xray diffraction (XRD)， electrochemical test and cupping test， the effects of Mg (15 wt.%) on the microstructure， corrosion resistance and formability of Galvalume(Zn55Al16Si) coating were studied. The SEM and XRD results revealed that MgZn2 phases appeared in the zincrich interdendritic area of Zn55Al16Si15Mg coating. The morphology of the corrosion product showed that magnesium eliminated the cracks in the corrosion product of Galvalume coating and enhanced the compactness of the corrosion product. The results of the electrochemical test showed that the corrosion rate of Zn55Al16Si15Mg coating was 341% of that of Galvalume coating， which means that the addition of magnesium markedly improved the corrosion resistance of the Galvalume coating. As a strengthening phase， MgZn2 strengthened the zincrich interdendritic area of the coating and decreased the cracks in the outer bending surface of the formed cup. As a result， the formability of Galvalume coatings was improved significantly.

Key words: Galvalume coating, microstructure, corrosion resistance, formability

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