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中国腐蚀与防护学报  2017, Vol. 37 Issue (6): 583-589    DOI: 10.11902/1005.4537.2016.211
  研究报告 本期目录 | 过刊浏览 |
0.1%NaHSO3盐雾条件下T91钢的腐蚀行为
冯超1,2, 彭碧草1,2, 谢亿1,2, 王军1,2, 李明欢3, 吴堂清3(), 尹付成3
1 国网湖南电力公司电力科学研究院 长沙 410007
2 湖南省湘电锅炉压力容器检验中心有限公司 长沙 410007
3 湘潭大学材料科学与工程学院 湘潭 411105
Corrosion Behavior of T91 Steel by Salt Spray with 0.1%NaHSO3 Solution
Chao FENG1,2, Bicao PENG1,2, Yi XIE1,2, Jun WANG1,2, Minghuan LI3, Tangqing WU3(), Fucheng YIN3
1 State Grid Hunan Electric Power Corporation Research Institute, Changsha 410007, China
2 Hunan Xiangdian Boiler & Pressure Vessel Test Center Ltd., Changsha 410007, China;
3 School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
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摘要: 

在NaHSO3溶液中进行盐雾实验,利用腐蚀失重、宏观形貌和微观形貌观察等方法研究了T91钢盐雾腐蚀过程中的腐蚀行为。结果表明,在100 h盐雾腐蚀过程中,T91钢腐蚀产物逐步增加,其覆盖比例、完整度和致密性都逐渐提高,并最终覆盖样品表面。腐蚀产物的主要成分为FeOOH、Fe2O33H2O和Cr2O3,并含有少量硫化物。T91钢腐蚀过程可以表述为:样品表面先产生了零星的局部腐蚀,而后局部腐蚀逐渐长大并相互连接形成大腐蚀坑,大腐蚀坑逐步发展形成更大范围的腐蚀。

关键词 T91钢盐雾实验扫描电镜局部腐蚀    
Abstract

Corrosion behavior of T91 steel by neutral salt spray with 0.1% (mass fraction) NaHSO3 was studied by means of mass loss measurement, macro-appearances observation and characterization of corrosion products with scanning electron microscope/energy dispersive spectrometer (SEM/EDS). Results showed the corrosion product on the steel surface increases gradually throughout the salt spray testing, and its coverage ratio, integrity and compactness increase accordingly, and finally the corrosion product completely covers the steel surface. The corrosion product composed mainly of FeOOH, Fe2O33H2O and Cr2O3 containing a little sulfur. The corrosion process of T91 steel by salt spray test can be expressed as follows: during the salt spray with NaHSO3 solution, localized corrosion sporadically generates on the steel surface at the initial stage, and then these localized corrosion develops into big corrosion spots, and finally those big corrosion spots spread and connected each other to generate corrosion on large area.

Key wordsT91 steel    salt spray test    SEM    localized corrosion
收稿日期: 2016-10-26     
ZTFLH:  TG172.4  
基金资助:国家自然科学基金 (51601164) 和中国博士后科学基金 (2017M622954)
作者简介:

作者简介 冯超,男,1988年生,博士

引用本文:

冯超, 彭碧草, 谢亿, 王军, 李明欢, 吴堂清, 尹付成. 0.1%NaHSO3盐雾条件下T91钢的腐蚀行为[J]. 中国腐蚀与防护学报, 2017, 37(6): 583-589.
Chao FENG, Bicao PENG, Yi XIE, Jun WANG, Minghuan LI, Tangqing WU, Fucheng YIN. Corrosion Behavior of T91 Steel by Salt Spray with 0.1%NaHSO3 Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 583-589.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.211      或      https://www.jcscp.org/CN/Y2017/V37/I6/583

图1  T91钢在0.1%NaHSO3盐雾下的腐蚀失重曲线
图2  T91钢在0.1%NaHSO3盐雾实验过程中的腐蚀产物宏观形貌的演化
图3  T91钢在0.1%NaHSO3溶液盐雾腐蚀25 h后表面腐蚀产物的微观形貌
Position Fe Cr S Cl Si
1 51.13 10.06 3.29 --- ---
2 11.97 2.46 2.26 0.53 ---
3 49.14 4.46 --- --- 1.92
4 5.48 13.16 4.55 0.71 ---
5 58.65 7.68 --- --- ---
6 15.94 --- 1.53 --- ---
7 40.08 15.37 7.80 --- ---
8 41.80 16.44 2.49 --- ---
9 9.43 9.41 1.58 --- ---
表1  T91钢在0.1%NaHSO3盐雾实验下腐蚀产物的EDS分析结果
图4  T91钢在0.1% NaHSO3溶液盐雾实验50 h后表面腐蚀产物的微观形貌
图5  T91钢在0.1%NaHSO3溶液盐雾实验75 h后表面腐蚀产物的微观形貌
图6  T91钢在0.1%NaHSO3溶液盐雾腐蚀100 h后表面腐蚀产物的微观形貌
图7  T91钢在0.1%NaHSO3溶液盐雾实验不同时间后表面形成的腐蚀产物的XRD谱
图8  在0.1%NaHSO3溶液盐雾实验不同时间后T91钢的腐蚀形貌
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