温度对14Cr12Ni3WMoV不锈钢在0.02 mol/L NaCl溶液中腐蚀行为的影响

doi:10.11902/1005.4537.2020.073

中国腐蚀与防护学报

2021, Vol. 41

Issue (3): 362-368 DOI: 10.11902/1005.4537.2020.073

研究报告

本期目录 | 过刊浏览

温度对14Cr12Ni3WMoV不锈钢在0.02 mol/L NaCl溶液中腐蚀行为的影响

冉斗¹^,², 孟惠民¹, 李全德¹^,²^,³(

), 巩秀芳²^,³, 倪荣²^,³, 姜英²^,³, 龚显龙²^,³, 戴君²^,³, 隆彬²^,³(

)

^1.北京科技大学新材料技术研究院北京 100083
^2.长寿命高温材料国家重点实验室德阳 618000
^3.东方汽轮机有限公司德阳 618000

Effect of Temperature on Corrosion Behavior of 14Cr12Ni3-WMoV Stainless Steel in 0.02 mol/L NaCl Solution

RAN Dou¹^,², MENG Huimin¹, LI Quande¹^,²^,³(

), GONG Xiufang²^,³, NI Rong²^,³, JIANG Ying²^,³, GONG Xianlong²^,³, DAI Jun²^,³, LONG Bin²^,³(

)

^1.Institute of Advance Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
^2.State Key Laboratory of Long-life High Temperature Materials, Deyang 618000, China
^3.Dongfang Turbine Co. , Ltd. , Deyang 618000, China

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摘要:

采用开路电位、动电位极化、电化学阻抗谱等电化学测试方法，并结合激光共聚焦显微镜和扫描电镜能谱面扫描表征手段，研究了温度对汽轮机末级叶片用钢14Cr12Ni3WMoV在0.02 mol/L NaCl溶液中腐蚀行为的影响。结果表明：随着温度的升高，14Cr12Ni3WMoV不锈钢腐蚀倾向和腐蚀速率均增大，点蚀敏感性增强，自修复能力减弱，材料耐蚀性下降；材料表面点蚀坑随着温度的升高沿径向的发展变快，而沿纵向的发展减缓；点蚀发生时，材料发生选择性溶解，其中Fe和Ni溶解较快，而Cr、W、Mo和V因溶解缓慢在腐蚀坑内发生富集，并且温度的变化对Cr、W、Mo和V的富集没有明显影响。

关键词 ：电化学腐蚀, 不锈钢, 叶片, 汽轮机, 温度, 钝化膜

Abstract：

The effect of temperature on the corrosion behavior of 14Cr12Ni3WMoV stainless steel for the final stage blade of steam turbine in 0.02 mol/L NaCl solution was studied by means of electrochemical techniques including open circuit potential measurement, potentiodynamic polarization measurement and electrochemical impedance spectroscopy, as well as laser scanning confocal microscopy and scanning electron microscopy coupled with energy dispersive spectroscopy. The results show that with the increasing temperature, both the corrosion tendency and corrosion rate of 14Cr12Ni3WMoV stainless steel increase. Meanwhile, its pitting sensitivity increases with weakened self-repairing ability of its passivation film, thus the corrosion resistance of the steel decreases. The corrosion pit develops faster in the radial direction，but its development in depth slows down with the increasing temperature. When pitting occurs, Fe, Cr, Ni, W, Mo and V in the steel selectively dissolve, demonstrating that Fe and Ni dissolve quickly, while Cr, W, Mo and V are enriched in the corrosion pit due to their slow dissolution, whereas the change of temperature has no obvious effect on the enrichment of Cr, W, Mo and V.

Key words： electrochemistry corrosion stainless steel blade steam turbine temperature passivation film

收稿日期: 2020-04-23

ZTFLH:

TG174

基金资助:四川省科技计划应用基础研究项目(2019YJ0699);长寿命高温材料国家重点实验室开放课题(DTCC28EE190230)

通讯作者: 李全德,隆彬 E-mail: quandelee@126.com;longbin@dongfang.com

Corresponding author: LI Quande,LONG Bin E-mail: quandelee@126.com;longbin@dongfang.com

作者简介: 冉斗，男，1995年生，硕士生

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引用本文:

冉斗, 孟惠民, 李全德, 巩秀芳, 倪荣, 姜英, 龚显龙, 戴君, 隆彬. 温度对14Cr12Ni3WMoV不锈钢在0.02 mol/L NaCl溶液中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2021, 41(3): 362-368.
Dou RAN, Huimin MENG, Quande LI, Xiufang GONG, Rong NI, Ying JIANG, Xianlong GONG, Jun DAI, Bin LONG. Effect of Temperature on Corrosion Behavior of 14Cr12Ni3-WMoV Stainless Steel in 0.02 mol/L NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 362-368.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.073 或 https://www.jcscp.org/CN/Y2021/V41/I3/362

图1 14Cr12Ni3WMoV不锈钢在不同温度下0.02 mol/L NaCl溶液中的开路电位

图2 14Cr12Ni3WMoV不锈钢在不同温度下0.02 mol/L NaCl溶液中电化学测试结果

表1 14Cr12Ni3WMoV不锈钢在不同温度下0.02 mol/L NaCl溶液中电化学参数

图3 14Cr12Ni3WMoV不锈钢在不同温度下0.02 mol/L NaCl溶液中测得的电化学阻抗谱

图4 不同温度下EIS曲线拟合所用的等效电路

表2 不同温度下电化学阻抗谱的拟合结果

图5 14Cr12Ni3WMoV不锈钢在不同温度下0.02 mol/L NaCl溶液中的腐蚀形貌及三维形貌

图6 14Cr12Ni3WMoV不锈钢在不同温度下0.02 mol/L NaCl溶液中最大点蚀坑的深度和孔径

图7 14Cr12Ni3WMoV不锈钢试样在80 ℃下形成腐蚀坑的元素分布

图8 14Cr12Ni3WMoV不锈钢试样在40 ℃下形成腐蚀坑的元素分布

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