| 硼偏聚对超低碳微合金钢腐蚀行为的影响 |
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| 引用本文： | 张崴,杨善武,贺信莱. 硼偏聚对超低碳微合金钢腐蚀行为的影响[J]. 材料热处理学报, 2009, 30(1): 45-49 |
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| 作者姓名： | 张崴 杨善武 贺信莱 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京,100083;北京科技大学材料科学与工程学院,北京,100083;北京科技大学材料科学与工程学院,北京,100083 |
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| 基金项目： | 国家重点基础科学研究计划(2004CB619102) |
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| 摘 要： | 通过设计热处理工艺使耐候钢中所含硼元素发生不同程度的晶界偏聚,并结合采用扫描电镜、能谱分析和电化学方法研究偏聚对该合金钢腐蚀行为的影响。结果表明:硼的晶界偏聚越强,样品的局部腐蚀就越严重,其表现就是钢基体-锈层界面愈加不平整。晶界硼偏聚首先对该钢初期腐蚀有促进作用,硼的晶界偏聚促进晶界择优腐蚀。在硼明显偏聚的样品的表面形成锈层后,腐蚀会沿晶界深入基体。致密锈层对Cl-的渗透有阻碍作用,使得靠近基体的内锈层中Cl-含量及Cl-/Na+比均低于远离基体的外锈层。电化学结果表明,试样偏聚的加重使得锈层腐蚀电流密度逐渐增大,自腐蚀电位也逐渐向负方向偏移,锈层整体上表现出保护性减弱。
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| 关 键 词： | 硼偏聚 耐候钢 腐蚀 |
Influence of boron segregation on corrosion behavior of weathering steel |
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| ZHANG Wei,YANG Shan-wu,HE Xin-lai. Influence of boron segregation on corrosion behavior of weathering steel[J]. Transactions of Materials and Heat Treatment, 2009, 30(1): 45-49 |
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| Authors: | ZHANG Wei YANG Shan-wu HE Xin-lai |
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| Affiliation: | School of Materials Science and Engineering;University of Science and Technology Beijing;Beijing 100083;China |
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| Abstract: | Boron segregation with different degrees in weathering steel was produced by special heat treatments.The influence of boron segregation on corrosion behavior of the steel was investigated by SEM,EDX and electrochemical method.The results show that serious boron segregation results in severer localized corrosion,forming a rougher interface between steel substrate and rust layer.The boron segregation accelerates the corrosion in the initial stage and preferential corrosion at grain boundaries.After the format... |
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| Keywords: | boron segregation weathering steel corrosion |
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