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中国腐蚀与防护学报  2019, Vol. 39 Issue (6): 495-503    DOI: 10.11902/1005.4537.2019.232
  研究报告 本期目录 | 过刊浏览 |
EBSD技术研究金属材料晶体取向对大气腐蚀萌生的影响机理
潘成成,马超,夏大海()
天津大学材料科学与工程学院 天津市材料复合与功能化重点实验室 天津 300354
Estimation for Relevance of Atmospheric Corrosion Initiation with Surface Texture of Several Metallic Materials by Electron Backscattering Diffraction
PAN Chengcheng,MA Chao,XIA Dahai()
Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin 300354, China
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摘要: 

利用电子背散射衍射 (EBSD) 技术,对Q235B钢、T91钢、7050铝合金和LY12铝合金4种材料表面预标记区域的晶体结构与取向进行了分析,研究4种金属表面在Cl-污染大气环境中的腐蚀萌生过程,及其表面晶体结构与取向对其大气腐蚀早期过程的影响。结果表明,Q235B钢的表面结构对在Cl-污染大气中均匀腐蚀萌生、发展过程没有显著影响,这主要是因为Q235B钢在大气环境中处于活化状态。T91钢倾向于在晶界处发生腐蚀,7050铝合金和LY12铝合金的点蚀坑则倾向于在表面能较高的晶面萌生。对于发生局部腐蚀的金属来说,腐蚀萌生易发生在钝化膜容易击穿的位置,晶界处和表面能较高的晶面由于钝化膜的稳定性较差,因而较容易发生腐蚀。

关键词 大气腐蚀电子背散射衍射晶体结构择优取向    
Abstract

The relevance of the corrosion initiation in a chlorine ions containing atmosphere with the surface morphology, peculiarly the texture of metallic materials such as Q235B carbon steel, T91 steel, 7050 Al-alloy and LY12 Al-alloy was studied by means of an atmospheric corrosion chamber and electron backscattering diffraction (EBSD) technique. The results showed that the surface texture of Q235B has no significant influence on the initiation and development of uniform corrosion in the chlorine polluted atmosphere, which may be ascribed to that Q235B steel is activated in the test atmosphere. T91 steel tends to be corroded at grain boundaries, while pitting corrosion is apt to initiate on the grain surface with high surface energy for 7050 Al-alloy and LY12 Al-alloy. Besides, for the metallic materials sensitive to local corrosion, the corrosion of which is likely to occur at sites where the passivation film tends to be destroyed easily, in other words, the passivation film has poor stability at grain boundaries and on spots with high surface energy.

Key wordsatmospheric corrosion    EBSD    crystal texture    preferred orientation
收稿日期: 2019-03-15     
ZTFLH:  O646  
基金资助:国家自然科学基金(51701140)
通讯作者: 夏大海     E-mail: dahaixia@tju.edu.cn
Corresponding author: Dahai XIA     E-mail: dahaixia@tju.edu.cn
作者简介: 潘成成,男,1993年生,硕士生

引用本文:

潘成成,马超,夏大海. EBSD技术研究金属材料晶体取向对大气腐蚀萌生的影响机理[J]. 中国腐蚀与防护学报, 2019, 39(6): 495-503.
Chengcheng PAN, Chao MA, Dahai XIA. Estimation for Relevance of Atmospheric Corrosion Initiation with Surface Texture of Several Metallic Materials by Electron Backscattering Diffraction. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 495-503.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.232      或      https://www.jcscp.org/CN/Y2019/V39/I6/495

SampleCMoPVMnCrNiSiNbSCuFe
Q235B0.21---0.017---0.58------0.21---0.0360.020Bal.
T910.100.89---0.200.408.900.120.240.08------Bal.
表1  实验用钢的化学成分 (mass fraction / %)
SampleCuMgMnTiZnFeSiNiCrAl
70502.0~2.61.9~2.60.10.065.7~6.70.150.12---0.04Bal.
LY124.181.3~1.80.30.15---0.50.50.1---Bal.
表2  实验用铝合金的化学成分 (mass fraction / %)
图1  4种材料待检测区域表面形貌
图2  全欧拉角图
图3  样品放置方式
图4  极射赤面 (赤道面) 投影图
图5  Q235B钢表面检测区域不同方向的反极图 (IPF mapping)
图6  Q235B钢表面不同方向的取向分布散点图和取向分布密度图
图7  Q235B钢表面形貌随盐雾实验时间的变化及横向 (X0方向) 反极图与检测区域的对比
图8  T91钢,7050铝合金和LY12铝合金的极射赤面 (赤道面) 投影图
图9  T91钢,7050铝合金和LY12铝合金的极射赤面 (赤道面) 投影图
图10  T91钢,7050铝合金及LY12铝合金经10 h盐雾实验后的表面形貌与反极图的对比
图11  T91钢,7050铝合金及LY12铝合金的取向分布反极图
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