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 (2): 261-264.DOI: -

• 材料与冶金 • 上一篇    下一篇

硼稀土共渗钛合金的耐蚀性研究

李凤华1，衣晓红2，樊占国1，张景垒1   

  1. (1.东北大学材料与冶金学院，辽宁沈阳110819；2.清华大学摩擦学国家重点实验室，北京100084)
  • 收稿日期:2012-06-28 修回日期:2012-06-28 出版日期:2013-02-15 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:李凤华(1977-)，女，湖北荆门人，东北大学副教授；樊占国(1944-)，男，黑龙江五常人，东北大学教授，博士生导师.
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(N110402004).

Corrosion Resistance of Rare EarthBorided Titanium Alloy

LI Fenghua1， YI Xiaohong2， FAN Zhanguo1， ZHANG Jinglei1   

  1. 1. School of Materials ＆ Metallurgy， Northeastern University， Shenyang 110819， China； 2. The State Key Laboratory of Tribology， Tsinghua University， Beijing 100084， China.
  • Received:2012-06-28 Revised:2012-06-28 Online:2013-02-15 Published:2013-04-04
  • Contact: LI Fenghua
  • About author:-
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摘要： 采用不需保护性气氛的固体粉末法对Ti6Al4V(TC4)合金表面进行稀土与硼共渗，并对硼稀土共渗TC4钛合金、单渗硼TC4钛合金及未经渗硼处理的TC4钛合金基体，分别在35%NaCl和5%H2SO4(质量分数)溶液介质中进行了腐蚀实验.X射线衍射分析表明，TC4表面渗层由TiB2和TiB组成.扫描电镜观察表明，外层的TiB2具有平坦的生长前沿，而内层TiB为锯齿状形貌；其中外层的TiB2内部存在少量针孔，分析认为是Ce原子与B原子共渗时产生的Kirkendall效应所致.Tafel极化曲线分析结果表明，在35%NaCl和5%H2SO4溶液介质中，各样品的耐蚀性大小排序为单渗硼TC4钛合金>硼稀土共渗TC4钛合金>未经渗硼处理的TC4钛合金.

关键词: Ti6Al4V合金, 渗硼, 稀土催化, 耐蚀性

Abstract: Rare earth and B atoms were penetrated into Ti6Al4V (TC4) alloy surface using the solid powder technique without protective atmosphere. The rare earthborided， borided and TC4 alloys were corroded in the 35wt% NaCl and 5wt% H2SO4 solutions， respectively. The Xray diffraction analysis shows that the borided layer on the TC4 surface is composed of TiB2 and TiB. Scanning electron microscopy study shows that the outer TiB2 layer has a flat growth front， while the inner TiB layer appears serration. Some pinholes present in the outer layer， which may be due to the Kirkendall effects caused by the codiffuse of Ce and B atoms synchronically. The Tafel polarization curve shows that， in the 35wt% NaCl and 5wt% H2SO4 solution， the corrosion resistance of the samples follows the order of borided， rare earthborided and TC4 alloy.

Key words: Ti6Al4V alloy, boriding, rare earth catalysis, corrosion resistance

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