TP439不锈钢在800 ℃高温水蒸气中的初期氧化行为

doi:10.11902/1005.4537.2022.149

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 377-383 CSTR: 32134.14.1005.4537.2022.149 DOI: 10.11902/1005.4537.2022.149

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

TP439不锈钢在800 ℃高温水蒸气中的初期氧化行为

刘欢欢¹, 刘光明¹(

), 李富天¹, 孟令奇², 夏侯俊招², 顾佳磊²

^1.南昌航空大学材料科学与工程学院南昌 330063
^2.上海电气核电设备有限公司上海 201306

Oxidation Behavior of TP439 Stainless Steel in Water Vapor at 800 ℃

LIU Huanhuan¹, LIU Guangming¹(

), LI Futian¹, MENG Lingqi², XIAHOU Junzhao², GU Jialei²

^1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.Shanghai Electric Nuclear Power Equipment Co. Ltd., Shanghai 201306, China

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摘要:

研究了TP439不锈钢在800 ℃高温水蒸气中的初期氧化行为。采用恒温氧化法测试了TP439不锈钢在800 ℃高温水蒸气中的氧化动力学曲线。通过场发射电子扫描显微镜 (FE-SEM) 观察试样氧化后的形貌，采用能谱分析 (EDS) 及X射线衍射 (XRD) 分析膜层的表面成分及相结构。结果表明：TP439不锈钢在初期阶段的氧化速率较快，氧化动力学符合线性氧化规律，线性速率常数k_l为5.21×10^-2 mg/(cm²·h)，氧化过程受界面反应控制；随着氧化时间的增加氧化膜逐渐变厚，第二阶段的氧化动力学遵循抛物线规律，抛物线速率常数k_p为1.54×10^-3 mg²/(cm⁴·h)，氧化速率的控制步骤由界面反应控制转为扩散控制。TP439不锈钢氧化产物的主要成分为 (Cr，Fe)₂O₃和少量的Cr₂O₃、Fe₂O₃、FeCr₂O₄尖晶石氧化物。在氧化初期阶段，试样表面沿晶界处分布的氧化物颗粒较多，这是由于晶界是元素快速扩散通道，表面沿晶界生成网状氧化物。

关键词 ： TP439不锈钢, 高温氧化, 水蒸气, 氧化动力学

Abstract：

The oxidation behavior of TP439 stainless steel in water vapor was studied by means of intermittent weighing method, field emission scanning electron microscope (FE-SEM) and X-ray diffractometer. In the initial oxidation stage, the formed oxide scale of TP439 stainless steel is very thin, the oxidation rate is fast, the oxidation kinetics conforms to the linear oxidation law with a linear rate constant k_l of 5.214×10^-2, the oxidation process is controlled by the interface reaction; with the increase of oxidation time, the oxide scale gradually thickens, which hinders the inward diffusion of oxygen ions and the outward diffusion of metal ions, the control step of the oxidation process is changed from interface reaction control to diffusion control; the oxidation kinetics in the second stage follows a parabolic law with a parabolic rate constant k_p of 1.54×10^-3, the oxidation control step is diffusion control. The main components of TP439 stainless steel oxidation products are (Cr, Fe)₂O₃ and a small amount of Cr₂O₃, Fe₂O₃, FeCr₂O₄ spinel oxides. In the early stage of oxidation, there are more oxide particles distributed along the grain boundary on the surface of the steel. This is because the grain boundary is the fast diffusion channel of elements, therefore, network-like oxides along the grain boundary emerges on the steel surface.

Key words： TP439 stainless steel high temperature oxidation water vapor oxidation kinetics

收稿日期: 2022-05-13 32134.14.1005.4537.2022.149

ZTFLH:

TG172

基金资助:国家自然科学基金(51961028)

作者简介: 刘欢欢，女，1996年生，硕士生

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引用本文:

刘欢欢, 刘光明, 李富天, 孟令奇, 夏侯俊招, 顾佳磊. TP439不锈钢在800 ℃高温水蒸气中的初期氧化行为[J]. 中国腐蚀与防护学报, 2023, 43(2): 377-383.
Huanhuan LIU, Guangming LIU, Futian LI, Lingqi MENG, Junzhao XIAHOU, Jialei GU. Oxidation Behavior of TP439 Stainless Steel in Water Vapor at 800 ℃. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 377-383.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.149 或 https://www.jcscp.org/CN/Y2023/V43/I2/377

图1 TP439不锈钢在800 ℃高温水蒸气中48和2 h的氧化动力学曲线

图2 TP439不锈钢在800 ℃高温水蒸气中的氧化动力学拟合结果

图3 TP439不锈钢在800 ℃高温水蒸气中氧化不同时间后的XRD谱图

图4 TP439不锈钢在800 ℃高温水蒸气中氧化不同时间后的表面形貌及其对应的能谱图

图5 TP439不锈钢在800 ℃高温水蒸气中氧化不同时间后的表面形貌图

图6 图5中O、Cr和Fe成分与氧化时间变化关系图

图7 TP439不锈钢在高温水蒸气中氧化物沿晶界生长示意图

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