Study on Corrosion Kinetics and Product Thermodynamics of Materials in Supercritical CO<sub>2</sub>

GUO Tingshan; LIANG Zhiyuan; ZHAO Qinxin

doi:10.7652/xjtuxb202312014

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Study on Corrosion Kinetics and Product Thermodynamics of Materials in Supercritical CO₂

更新时间：2025-07-09

- Study on Corrosion Kinetics and Product Thermodynamics of Materials in Supercritical CO₂
- Vol. 57, Issue 12, Pages: 136-145(2023)
- 作者机构：
  
  西安交通大学热流科学与工程教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202312014
  CLC： TG178
- Online First：10 December 2023，
  
  Published：2023
- 稿件说明：
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GUO Tingshan, LIANG Zhiyuan, ZHAO Qinxin. Study on Corrosion Kinetics and Product Thermodynamics of Materials in Supercritical CO₂[J]. 2023, 57(12): 136-145. DOI: 10.7652/xjtuxb202312014.
DOI：

GUO Tingshan, LIANG Zhiyuan, ZHAO Qinxin. Study on Corrosion Kinetics and Product Thermodynamics of Materials in Supercritical CO₂[J]. 2023, 57(12): 136-145. DOI: 10.7652/xjtuxb202312014. DOI：

摘要

针对超临界CO

动力循环高温承压部件与工质相容性问题

研究了T92耐热钢在600和700 ℃超临界CO

环境下的腐蚀过程动力学及其热力学产物。采用分子动力学计算了CO

在FeCr合金表面的吸附过程

模拟了T92耐热钢在初始氧化阶段原子的迁移和分布规律

并基于腐蚀热力学原理

分析了氧化层和碳化物的分布规律

最后通过高温腐蚀实验进行了验证。研究结果表明:700 ℃时

T92耐热钢氧化层厚度约为600 ℃时的13.5倍

氧化层结构为外侧Fe

层、内侧FeCr

层

氧化层内部主要为C

型碳化物; CO

优先吸附于Cr原子(111)表面

当Cr与CO

发生反应后

部分形成游离态的C沉积于氧化层表面

并以离子的形式向内扩散; 腐蚀过程主要由离子扩散控制

扩散速率随着温度的升高而增大。该研究为超临界CO

材料抗腐蚀性能评估提供了一种复合分析方法

也为关键高温承压部件材料的遴选及腐蚀寿命预测提供了数据支撑。

Abstract

For the challenges arising from the compatibility between the high-temperature pressure-bearing parts in the supercritical CO

power cycle system and the working medium

the corrosion kinetics and the corresponding thermodynamic products of T92 steel in supercritical CO

environments at 600 and 700 ℃ were studied. Firstly

the adsorption process of CO

on the surface of T92 steel was calculated by

molecular dynamics and the migration and distribution of atoms in T92 steel during the initial oxidation stage were simulated. Then

the distribution of oxide layers and carbides was analyzed based on the principle of corrosion thermodynamics. Finally

the high-temperature corrosion tests were carried out to verify the simulation results. The results showed that the thickness of the oxide layer on T92 steel at 700 ℃ was about 13.5 times higher than that at 600 ℃. The oxide layer consisted of an outer layer of Fe

and an inner layer of FeCr

. Under the oxide layer

there are C

carbides. CO

was preferentially adsorbed on the surface of Cr(111). Then Cr reacted with CO

to form some free C deposited on the surface of the oxide layer

which diffused inwards in the state of ions. The corrosion process was dominated by ion diffusion

and the diffusion rate increased with the temperature. The study provides a composite analysis method to evaluate the corrosion resistance of materials in the supercritical CO

and data support for materials selection and corrosion lifetime prediction of key high-temperature pressure-bearing parts.

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Study on Corrosion Kinetics and Product Thermodynamics of Materials in Supercritical CO2

DOI：10.7652/xjtuxb202312014

摘要

Abstract

关键词

Keywords

references

Study on Corrosion Kinetics and Product Thermodynamics of Materials in Supercritical CO₂