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中国腐蚀与防护学报  2010, Vol. 30 Issue (1): 51-57    
  研究报告 本期目录 | 过刊浏览 |
 碳钢在SO2大气环境中的腐蚀行为
刘月娥;林翠;赵晴
南昌航空大学材料科学与工程学院 南昌 330063
CORROSION BEHAVIOR OF MILD STEEL IN ATMOSPHERE CONTAINING SO2
LIU Yue'e; LIN Cui; ZHAO Qing
School of Materials Science and Technology; Nanchang Hangkong University; Nanchang 330063
全文: PDF(2824 KB)  
摘要: 

在实验室模拟含SO2体积分数分别为0.410-6和1×10-6的污染大气环境,研究20#碳钢的腐蚀规律。借助金相显微镜(OM)、扫描电镜(SEM)观察表面腐蚀形貌,X射线衍射仪(XRD)分析腐蚀产物成分。结果表明,随 SO2含量增加,碳钢腐蚀加快。在两种大气环境中碳钢腐蚀432 h,前者分为2个阶段,均符合指数增长规律;后者分为3个阶段,分别符合指数增加、线性增加和指数衰减规律。在SO2含量少的大气环境中,锈层较薄,在SO2含量多的大气环境中,腐蚀产物层向外生长速度相对较慢,锈层较厚。具有丝状腐蚀特征,丝状腐蚀物在晶界和表面活性点上开始生长,然后沿着晶界和铁素体向内延伸,同时在丝状物上有胞状锈的生成。S主要集中在胞状物上,SO2含量增加,胞状锈的生长速度加快。

关键词 20#碳钢SO2大气环境腐蚀行为    
Abstract

Corrosion behavior of mild steel was studied in atmosphere containing 0.4×10-6 and 1×10-6 volume fraction of SO2 with indoor simulated test. Corrosion morphologies were investigated by means of optical microscope (OM) and scanning electron microscopy (SEM), meanwhile corrosion products were analyzed by X-ray diffraction (XRD). The results showed that the corrosion rate of mild steel increased with increasing SO2 concentration. The atmospheric corrosion process of mild steel was divided into two stages in atmosphere containing 0.4×10-6  volume fraction of SO2  which both agreed with exponential growth law, while in atmosphere containing 1×10-6 volume fraction of SO2, it was divided into three stages which respectively followed exponential growth, linear growth and exponential decay law. It can be indicated from the observation of macroscopic surface that the growth rate of corrosion products was relatively quicker and the rust layer was thin in the condition of 0.4×10-6  volume fraction SO2, while in atmosphere containing 1×10-6  volume fraction of SO2, the rust layer grew outward slowly and the layer was thick. Atmospheric corrosion of mild steel had filiform corrosion characteristics in atmosphere containing SO2, filiform corrosion products which initiated from grain boundaries and surface active area spread along the grain boundaries and ferrite. At the same time, cellular products grew on the filiform corrosion products. Sulfur mainly concentrated in the cellular products. Cellular products grew faster with the increasing content of SO2.

Key words20# carbon steel    SO2    atmosphere    corrosion behavior
收稿日期: 2008-07-28     
ZTFLH: 

TG172.3

 
基金资助:

国家自然科学基金项目(50601012)资助

通讯作者: 林翠     E-mail: lincwi@sohu.com
Corresponding author: LIN Cui     E-mail: lincwi@sohu.com
作者简介: 刘月娥,女,1983年生,硕士,研究方向为大气腐蚀行为和机理

引用本文:

刘月娥;林翠;赵晴 .  碳钢在SO2大气环境中的腐蚀行为[J]. 中国腐蚀与防护学报, 2010, 30(1): 51-57.
LIU Ru-E, LIN Cui-, LIN Cui-. CORROSION BEHAVIOR OF MILD STEEL IN ATMOSPHERE CONTAINING SO2. J Chin Soc Corr Pro, 2010, 30(1): 51-57.

链接本文:

https://www.jcscp.org/CN/      或      https://www.jcscp.org/CN/Y2010/V30/I1/51

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