Cr对Q420钢在高盐度大气环境下耐蚀性的影响

doi:10.11902/1005.4537.2016.041

中国腐蚀与防护学报

2017, Vol. 37

Issue (3): 267-372 DOI: 10.11902/1005.4537.2016.041

本期目录 | 过刊浏览

Cr对Q420钢在高盐度大气环境下耐蚀性的影响

谭何灵¹,周成¹(

),刘希辉²,曹国明¹,张菁¹

1 北京科技大学材料科学与工程学院北京 100083
2 青州市建设工程质量安全监督站青州 262500

Effect of Cr on Corrosion Resistance of Q420 Steel in Atmosphere with High Salinity

Heling TAN¹,Cheng ZHOU¹(

),Xihui LIU²,Guoming CAO¹,Jing ZHANG¹

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Construction Project Quality and Safety Supervision Station, Qingzhou 262500, China

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摘要:

通过腐蚀失重比较了4种不同Cr含量的Q420钢在模拟的高盐度工业大气环境下的耐蚀性能,研究了Cr对Q420钢锈层结构与组成的影响及其作用机理。结果表明,含Cr钢的耐蚀性能优于Q420钢,且9% (质量分数) Cr钢的腐蚀速率最低,耐蚀性最好;Q420钢的腐蚀速率保持稳定,含Cr钢的腐蚀速率先增大后减小,这是因为含Cr钢的锈层随着腐蚀的进行会由初期的不稳定状态转变为稳定状态,耐蚀性得到增强;Cr促进了内锈层中稳定相α-FeOOH的生成,使锈层结构更加稳定、致密,对腐蚀性介质的传递过程起到了显著的阻碍作用。

关键词 ： Q420, Cr合金钢, 高盐度大气环境, 耐蚀性能, α-FeOOH

Abstract：

Effect of Cr on the corrosion resistance of Q420 steels with different Cr content (2%, 5% and 9% mass fraction) in atmosphere with high salinity was investigated by means of weight loss test, XRD and SEM. The results show that corrosion resistance of Cr modified Q420 steels is higher than that of simple Q420 steel. Among others the Q420 steel with 9%Cr shows the lowest corrosion rate and the highest corrosion resistance. The curve of corrosion rate versus time of the simple Q420 steel kept stable within a high level. While the corrosion rate of Cr modified steels increases in the initial stage and then increases, which indicates that the rust scale became compact and stable in the later stage. It was revealed that Cr can promote the formation of α-FeOOH, which is a stable phase and makes the rust scale much compact and stable so that to act as an effective barrier for the transfer process of the corrosive species.

Key words： Q420 Cr alloyed steel high salinity atmospheric environment corrosion resistance α-FeOOH

收稿日期: 2016-03-25

基金资助:国家自然科学基金 (51271023)

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引用本文:

谭何灵,周成,刘希辉,曹国明,张菁. Cr对Q420钢在高盐度大气环境下耐蚀性的影响[J]. 中国腐蚀与防护学报, 2017, 37(3): 267-372.
Heling TAN, Cheng ZHOU, Xihui LIU, Guoming CAO, Jing ZHANG. Effect of Cr on Corrosion Resistance of Q420 Steel in Atmosphere with High Salinity. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 267-372.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.041 或 https://www.jcscp.org/CN/Y2017/V37/I3/267

图1 4种不同Cr含量钢的腐蚀速率与腐蚀失厚随时间的变化曲线

图2 4种钢腐蚀72和360 h后的表面锈层形貌

图3 4种钢腐蚀72和360 h后的锈层截面SEM像

图4 4种钢腐蚀360 h去除外锈层后的表面XRD谱

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