F22母材与焊缝在模拟沿海空气中的高温腐蚀行为研究

doi:10.11902/1005.4537.2022.182

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 594-600 CSTR: 32134.14.1005.4537.2022.182 DOI: 10.11902/1005.4537.2022.182

研究报告

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F22母材与焊缝在模拟沿海空气中的高温腐蚀行为研究

柳志浩¹, 刘光明¹(

), 何思凡², 董猛², 李玉¹, 李富天¹, 祝婷¹

^1.南昌航空大学材料科学与工程学院南昌 330063
^2.东方电气集团东方锅炉股份有限公司自贡 643001

High Temperature Corrosion Behavior of F22 Base Metal and Weld in Simulated Coastal Atmosphere

LIU Zhihao¹, LIU Guangming¹(

), HE Sifan², DONG Meng², LI Yu¹, LI Futian¹, ZHU Ting¹

^1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.DEC Dongfang Boiler Group Co. Ltd., Zigong 643001, China

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摘要:

研究了F22母材与焊缝在510 ℃模拟沿海空气下的高温腐蚀行为，测量了母材与焊缝的腐蚀动力学曲线。采用X射线衍射 (XRD) 和扫描电子显微镜 (SEM) / 能谱仪 (EDS) 分析了母材与焊缝的腐蚀产物相组成及其表面和截面形貌。结果表明：F22母材与焊缝在腐蚀过程中均表现为增重，焊缝腐蚀速率略大于母材，腐蚀前250 h增重较快，250 h后动力学均符合抛物线规律。腐蚀产物分层，外层为Fe₂O₃，内层为Fe₂O₃与Fe₃O₄的混合物。由于Cr含量较低，没有生成保护性能良好的Cr₂O₃膜。

关键词 ： F22钢, 沿海空气, 高温腐蚀

Abstract：

The high temperature corrosion behavior of F22 base metal and weld at 510 ℃ in simulated coastal atmosphere was studied. The corrosion kinetic curves of base metal and weld was measured. The microstructure, chemical composition, phase constituent, surface and cross-sectional morphology of corrosion products were characterized by means of optical metallography, XRD and SEM/EDS. The results showed that both the weld and base metal of F22 steel showed mass gain during the corrosion process. The mass gain rate in the initial 250 h is faster than that in the subsequent corrosion process, while the corrosion rate of the weld is slightly greater than that of the base material. The kinetics followed parabolic law after 250 h corrosion. The corrosion product scale had a duplex microstructure, the outer layer was Fe₂O₃, and the inner layer was a mixture of Fe₂O₃, Fe₃O₄. Due to the low Cr content of the alloy, a protective Cr₂O₃ film did not form on the sample surface. The corrosion mechanism is briefly discussed too.

Key words： F22 steel coastal air high temperature corrosion

收稿日期: 2022-06-05 32134.14.1005.4537.2022.182

ZTFLH:

TG172

基金资助:国家自然科学基金(51961028)

通讯作者: 刘光明，E-mail：gemliu@126.com，研究方向为材料的腐蚀与防护

Corresponding author: LIU Guangming, E-mail: gemliu@126.com

作者简介: 柳志浩，男，1997年生，硕士生

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引用本文:

柳志浩, 刘光明, 何思凡, 董猛, 李玉, 李富天, 祝婷. F22母材与焊缝在模拟沿海空气中的高温腐蚀行为研究[J]. 中国腐蚀与防护学报, 2023, 43(3): 594-600.
LIU Zhihao, LIU Guangming, HE Sifan, DONG Meng, LI Yu, LI Futian, ZHU Ting. High Temperature Corrosion Behavior of F22 Base Metal and Weld in Simulated Coastal Atmosphere. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 594-600.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.182 或 https://www.jcscp.org/CN/Y2023/V43/I3/594

图1 F22板材焊接实物图

表1 F22母材与焊缝化学成分表 (mass fraction / %)

图2 模拟沿海空气试验装置图

图3 F22母材与焊缝金相显微图片

图4 F22母材与焊缝在510 ℃模拟沿海空气中腐蚀3000 h的腐蚀动力学曲线与拟合曲线

图5 F22母材与焊缝在510 ℃模拟沿海空气中腐蚀3000 h的表面微观形貌与能谱图

图6 F22母材与焊缝在510 ℃模拟沿海空气中腐蚀3000 h的截面微观形貌与线扫描图

表2 F22母材和焊缝截面各区域元素含量

图7 F22母材与焊缝在510 ℃模拟沿海空气中腐蚀3000 h与剥离不同厚度氧化膜后的XRD谱

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