传热管用Incoloy800H合金在模拟石墨粉尘环境中的碳化行为研究

doi:10.11902/1005.4537.2022.094

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 365-370 CSTR: 32134.14.1005.4537.2022.094 DOI: 10.11902/1005.4537.2022.094

中国腐蚀与防护学报编委、青年编委专栏

本期目录 | 过刊浏览

传热管用Incoloy800H合金在模拟石墨粉尘环境中的碳化行为研究

黄锦阳¹, 鲁金涛¹(

), 邢瑞华², 张醒兴¹, 黄春林³, 徐雅欣²

^1.西安热工研究院有限公司清洁低碳热力发电系统集成及运维国家工程研究中心西安 710032
^2.西北工业大学材料学院凝固技术国家重点实验室西安 710072
^3.西安科技大学材料科学与工程学院西安 710054

Carbonization Corrosion Behavior of Incoloy800H Alloy Used for Heat Transfer Tube in a Simulated Graphite Dust Environment

HUANG Jinyang¹, LU Jintao¹(

), XING Ruihua², ZHANG Xingxing¹, HUANG Chunlin³, XU Yaxin²

^1.National Engineering Research Center of Integration and Maintenance of Clean and Low-carbon Thermal Power Generation System, Xi'an Thermal Power Research Institute Co. Ltd., Xi'an 710032, China
^2.School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
^3.College of Material Science and Engineering, Xi'an University of Science and Technology, Xi′an 710054, China

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摘要:

利用透射电子显微镜 (TEM) 、扫描电子显微镜 (SEM) 以及X射线衍射仪 (XRD) 等手段对Incoloy800H合金在650 ^oC饱和石墨粉尘环境中的碳化行为及其机制开展了研究。结果表明：Incoloy800H合金的碳化腐蚀深度曲线遵循抛物线规律，腐蚀速率常数为0.013 μm/s^1/2，腐蚀产物层厚度随腐蚀时间的延长而增加；碳化3000 h后，合金表面腐蚀产物层主要以尖晶石相MnCr₂O₄和碳化物 (CrAlMn) _x C _y 为主，碳化层内颗粒状腐蚀产物为MnCr₂O₄、M₂₃C₆以及Al₂O₃，且主要沿晶界分布；晶界碳化-氧化是导致合金腐蚀进程加剧的关键因素。

关键词 ：蒸汽发生器, Incoloy800H, 碳化, 晶界腐蚀, 石墨粉

Abstract：

The carbonization corrosion behavior of Incoloy800H alloy was studied in a saturated graphite dust environment at 650 ℃ by means of transmission electron microscope, scanning electron microscope and X-ray diffractometer. The results show that the carbonization corrosion depth versus time curve of Incoloy 800H alloy followed parabolic law, and the rate constant of carbonization corrosion is 0.013 μm/s^1/2. The thickness of corrosion product layer increased with the prolonging of corrosion time. After corrosion for 3000 h, the corrosion products on Incoloy800H alloy surface composed mainly of MnCr₂O₄ spinel and (CrAlMn) _x C _y carbide, while the granular products in the internal carbonization zone was confirmed as MnCr₂O₄, M₂₃C₆ and Al₂O₃, distributing along the grainboundaries.The key factors, which aggravate the corrosion process of Incoloy800H alloy, was the carbonization-oxidation of grain boundaries.

Key words： steam generator Incoloy800H carbonization grain boundary corrosion graphite dust

收稿日期: 2022-04-06 32134.14.1005.4537.2022.094

ZTFLH:

TG172

基金资助:陕西省自然科学基础研究计划(2020JM-716);中国华能集团有限公司科技项目(HNKJ20-H43)

作者简介: 黄锦阳，男，1988年生，硕士

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引用本文:

黄锦阳, 鲁金涛, 邢瑞华, 张醒兴, 黄春林, 徐雅欣. 传热管用Incoloy800H合金在模拟石墨粉尘环境中的碳化行为研究[J]. 中国腐蚀与防护学报, 2023, 43(2): 365-370.
Jinyang HUANG, Jintao LU, Ruihua XING, Xingxing ZHANG, Chunlin HUANG, Yaxin XU. Carbonization Corrosion Behavior of Incoloy800H Alloy Used for Heat Transfer Tube in a Simulated Graphite Dust Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 365-370.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.094 或 https://www.jcscp.org/CN/Y2023/V43/I2/365

图1 Incoloy800H合金微观组织及XRD物相组成

图2 650 ℃饱和碳势下Incoloy800H合金碳化腐蚀深度变化规律

图3 Incoloy800H合金在650 ℃饱和碳势下碳化不同时间后的表面和截面形貌

图4 Incoloy800H合金在650 ℃饱和碳势下碳化不同时间后的表面XRD图谱

图5 Incoloy800H合金在650 ℃饱和碳势下碳化3000 h后的腐蚀层成分分析

图6 Incoloy800H合金碳化腐蚀过程示意图

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