高等级合金CO<sub>2</sub>环境下的腐蚀行为研究

doi:10.11902/1005.4537.2021.210

中国腐蚀与防护学报

2022, Vol. 42

Issue (4): 613-620 DOI: 10.11902/1005.4537.2021.210

研究报告

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高等级合金CO₂环境下的腐蚀行为研究

梁志远¹(

), 徐一鸣¹, 王硕¹^,², 李玉峰¹, 赵钦新¹

^1.西安交通大学热流科学与工程教育部重点实验室西安 710049
^2.哈尔滨锅炉厂有限责任公司哈尔滨 150046

Corrosion Behavior of Heat-resistant Alloys in High Temperature CO₂ Environment

LIANG Zhiyuan¹(

), XU Yiming¹, WANG Shuo¹^,², LI Yufeng¹, ZHAO Qinxin¹

^1.MOE Key Laborary of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
^2.Harbin Boiler Company Limited, Harbin 150046, China

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摘要:

以Sanicro 25奥氏体不锈钢和HR230、740H镍基合金为研究对象,在高温CO₂环境下分别进行了800、900和1000 ℃的腐蚀实验。利用分析天平获得材料反应前后的质量变化,利用SEM/EDS对合金反应后的形貌及腐蚀产物进行观察分析,利用XRD表征合金表面的腐蚀产物。结果表明：3种材料在高温CO₂环境下的腐蚀动力学曲线均符合抛物线规律,反应速率均随着温度的升高呈现量级的增加,表面腐蚀产物尺寸随着温度的升高不断增大。3种材料表面生成的腐蚀产物主要为富Cr氧化物。3种材料表面腐蚀产物结构存在差异,Sanicro 25不锈钢上的呈多层,而HR230和740H合金上的为单层；HR230和740H合金均存在内氧化现象,且740H合金中高含量的Al和Ti使其内氧化程度更加严重,抗CO₂腐蚀性能降低。因此,在高温CO₂环境下镍基合金HR230具有较为优越的抗腐蚀性能。

关键词 ：耐热合金, 高温CO₂, 腐蚀行为

Abstract：

Corrosion behavior of Sanicro 25 austenitic steel, HR230 and 740H Ni-based alloys in CO₂ environment at 800, 900 and 1000 ℃ was studied by means of weight gain measurement, scanning electron microscope with energy dispersive X-ray spectroscopy and X-ray diffractometer. The results showed that the corrosion kinetic curves of the three alloys in the high-temperature CO₂ environment conformed to the parabolic law. The reaction rates of the three alloys all increased with the temperature, and the thickness of surface corrosion products also increased with the temperature. The corrosion products generated on the surface of the three alloys were mainly Cr-rich oxides, which were caused by the high content of Cr. However,the structure of the surface corrosion products of Sanicro 25 steel and HR230 and 740H alloys was different. Sanicro 25 steel was a composite layer type, HR230 and 740H alloys was a single-layer type; both HR230 and 740H alloys had internal oxidation, and the high content of Al and Ti in 740H alloy made internal oxidation more serious, therewith degraded its corrosion resistance. According to the corrosion mass gain measurement results and the occurrence of internal oxidation phenomenon, the nickel-based alloy HR230 has superior corrosion resistance in high temperature CO₂ environment.

Key words： heat-resistance alloy high-temperature carbon dioxide corrosion behavior

收稿日期: 2021-08-24

ZTFLH:

TG174

基金资助:国家自然科学基金(51806166);黑龙江省自然科学基金优秀青年基金(YQ2020E032);中国博士后科学基金(BX20190269);中国博士后科学基金(2020M683474)

通讯作者: 梁志远 E-mail: liangzy@xjtu.edu.cn

Corresponding author: LIANG Zhiyuan E-mail: liangzy@xjtu.edu.cn

作者简介: 徐一鸣,男,1998年生,硕士生

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引用本文:

梁志远, 徐一鸣, 王硕, 李玉峰, 赵钦新. 高等级合金CO₂环境下的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2022, 42(4): 613-620.
Zhiyuan LIANG, Yiming XU, Shuo WANG, Yufeng LI, Qinxin ZHAO. Corrosion Behavior of Heat-resistant Alloys in High Temperature CO₂ Environment. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 613-620.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.210 或 https://www.jcscp.org/CN/Y2022/V42/I4/613

图1 实验系统图

表1 3种材料的材料成分

图2 3种材料在CO2气氛中不同温度下的腐蚀动力学曲线

表2 3种材料在不同温度下的抛物线速率常数

图3 3种材料在不同温度下腐蚀100 h后的质量变化

图4 lnKp与1/T的关系曲线

图5 3种材料在不同温度腐蚀100 h后的宏观表面形貌

图6 3种材料在不同温度下腐蚀100 h后的表面微观形貌

图7 3种合金在不同温度下腐蚀100 h后的断面微观形貌

图8 Sanicro 25耐热钢,R230合金和740H合金在1000 ℃下腐蚀100 h后的断面形貌及元素面扫描

图9 3种合金在不同温度下腐蚀100 h后的XRD分析

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