高温高CO2 压力下低合金钢P110SS在氯盐和甲酸盐溶液中腐蚀行为对比研究

doi:10.11902/1005.4537.2024.391

中国腐蚀与防护学报

2025, Vol. 45

Issue (5): 1390-1398 CSTR: 32134.14.1005.4537.2024.391 DOI: 10.11902/1005.4537.2024.391

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高温高CO₂ 压力下低合金钢P110SS在氯盐和甲酸盐溶液中腐蚀行为对比研究

罗铸¹, 刘佳乐²^,³, 魏安超¹, 黄洪林¹, 李鑫¹, 于延钊²^,³(

), 张梦飞²^,³

1 中海石油(中国)有限公司海南分公司海口 570100
2 中国石油大学(北京) 北京 102249
3 油气装备材料失效与腐蚀防护北京市重点实验室北京 102249

Corrosion Behavior of Low Alloy Steel P110SS in Chloride and Formate Solutions at High Temperature and High CO₂ Pressure

LUO Zhu¹, LIU Jiale²^,³, WEI Anchao¹, HUANG Honglin¹, LI Xin¹, YU Yanzhao²^,³(

), ZHANG Mengfei²^,³

1 Hainan Branch, CNOOC (China) Corporation Limitded, Haikou 570100, China
2 China University of Petroleum (Beijing), Beijing 102249, China
3 Beijing Key Laboratory of Material Failure and Corrosion Protection for Oil and Gas Equipment, Beijing 102249, China

引用本文:

罗铸, 刘佳乐, 魏安超, 黄洪林, 李鑫, 于延钊, 张梦飞. 高温高CO₂ 压力下低合金钢P110SS在氯盐和甲酸盐溶液中腐蚀行为对比研究[J]. 中国腐蚀与防护学报, 2025, 45(5): 1390-1398.
Zhu LUO, Jiale LIU, Anchao WEI, Honglin HUANG, Xin LI, Yanzhao YU, Mengfei ZHANG. Corrosion Behavior of Low Alloy Steel P110SS in Chloride and Formate Solutions at High Temperature and High CO₂ Pressure[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1390-1398.

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摘要:

研究了高温高CO₂压力下低合金钢P110SS分别在NaCl溶液和HCOOK溶液中的腐蚀行为，采用扫描电镜(SEM)、激光扫描共聚焦(CLSM)、X射线衍射仪(XRD)和透射电镜(TEM)等手段分析腐蚀产物的微观形貌、类型和生长形态等。结果表明：当处于相同CO₂压力的HCOOK溶液中时，150 ℃时P110SS钢的腐蚀速率是NaCl溶液中的10.6倍，180 ℃时为3.3倍。两种环境下的腐蚀产物存在明显差异。NaCl溶液中形成的FeCO₃为菱形块状，无明确的生长优势方向，在基体表面致密堆积，保护性较好。HCOOK溶液中的FeCO₃则呈“花簇”状，“花枝”由三片“羽片”沿“羽轴”向外生长，均匀分布，优势生长面为(018)、(116)和(0012)，由于结构松散，保护性差，腐蚀速率较高。

关键词 ：甲酸钾, FeCO₃腐蚀产物, 微观形貌, 优势生长面

Abstract：

The corrosion behavior of low alloy steel P110SS in NaCl and HCOOK solutions in high temperature and high-pressure CO₂ atmospheres is studied via high temperature and high-pressure autoclave. While the corrosion morphology and corrosion type, the composition and phase constituents of corrosion products were characterized by means of scanning electron microscopy (SEM), confocal laser scanning microscope (CLSM), X-ray diffractometer (XRD), and transmission electron microscopy (TEM). The results show that when setting the same CO₂ pressure, the corrosion rate of P110SS in HCOOK solution at 150 ℃ is 10.6 times that in NaCl solution and 3.3 times at 180 ℃. There are obvious differences in the corrosion products of P110SS in the two solutions. The final corrosion product formed in NaCl solution is FeCO₃, which has a rhombic block crystal morphology, no clear dominant growth direction, and is densely accumulated on the substrate surface. Therefore, it has a good ability to protect the substrate from further corrosion. The final corrosion product formed in the HCOOK solution is FeCO₃, but the difference is that its crystal morphology is in the shape of a "flower cluster", in which the "flower branches" are evenly distributed from three "pinnae" growing outward along the "pinnae axis", with dominant growth planes of (018), (116), and (0012). However, the corrosion scale has a loose structure, so the protection is poor and the corrosion rate is high.

Key words： potassium carbonate FeCO₃ corrosion product microstructure dominant growth surface

收稿日期: 2024-09-11 32134.14.1005.4537.2024.391

ZTFLH:

TG174.1

基金资助:中海油集团公司“十四五”重大科技项目(KJGG2021-0800)

通讯作者: 于延钊，E-mail：yuyanzhao0328@126.com.cn，研究方向为油气田腐蚀与防护

Corresponding author: YU Yanzhao, E-mail: yuyanzhao0328@126.com.cn

作者简介: 罗铸，男，1992年生，工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.391 或 https://www.jcscp.org/CN/Y2025/V45/I5/1390

图1 P110SS钢在不同温度、不同溶液中浸泡5 d后的腐蚀速率

图2 P110SS钢在不同温度、不同溶液中浸泡5 d后的SEM图

图3 P110SS钢在不同温度、不同溶液中浸泡5 d后去除腐蚀产物后的SEM图

图4 P110SS钢在不同温度、不同溶液中浸泡5 d后去除腐蚀产物后的CLSM图

图5 P110SS钢在不同温度、不同溶液中浸泡5 d后的截面SEM像

图6 P110SS钢在不同温度、不同溶液中浸泡5 d后腐蚀产物的XRD谱

图7 P110SS钢在150 ℃下NaCl、180 ℃下HCOOK溶液中浸泡5 d后腐蚀产物的TEM图和选区电子衍射

图8 P110SS钢在含CO2的NaCl溶液和HCOOK溶液中的腐蚀产物膜结构示意图

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