H<sub>2</sub>S/CO<sub>2</sub>共存环境中施加应力与介质流动对碳钢腐蚀行为的影响

doi:10.11902/1005.4537.2020.025

中国腐蚀与防护学报

2021, Vol. 41

Issue (2): 271-276 DOI: 10.11902/1005.4537.2020.025

研究报告

本期目录 | 过刊浏览

H₂S/CO₂共存环境中施加应力与介质流动对碳钢腐蚀行为的影响

葛鹏莉(

), 曾文广, 肖雯雯, 高多龙, 张江江, 李芳

中国石化西北油田分公司石油工程技术研究院乌鲁木齐 830011

Effect of Applied Stress and Medium Flow on Corrosion Behavior of Carbon Steel in H₂S/CO₂ Coexisting Environment

GE Pengli(

), ZENG Wenguang, XIAO Wenwen, GAO Duolong, ZHANG Jiangjiang, LI Fang

Northwest Oil Field Branch Company Engineering Technology Research Institute, Urumqi 830011, China

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摘要:

采用带有磁力驱动轴的高温高压腐蚀测试釜，通过失重法研究了施加应力与介质流动对20#钢和L245NS钢在H₂S/CO₂共存环境中腐蚀行为的影响。采用SEM和XRD表征手段分析了浸泡腐蚀后四点弯曲试样表面的微观形貌及腐蚀产物的组成。结果表明：在H₂S/CO₂共存环境中的各实验条件下，20#钢的平均腐蚀速率均高于L245NS钢的。当施加应力和液态介质流动时，两种材料的腐蚀速率均增大；应力对腐蚀速率的影响更显著。推测腐蚀机理为：H₂S在腐蚀过程中起主导作用，生成了具有保护性的FeS腐蚀产物膜。应力会导致腐蚀产物膜存在大量微观通道，促进了腐蚀过程的进行；流体流动加速了金属溶解和腐蚀性物质的扩散，表现出最大的腐蚀速率。

关键词 ： H₂S/CO₂共存, 腐蚀速率, 应力, 流速

Abstract：

The effect of applied stress and medium flow on the corrosion behavior of 20# steel and L245NS steel in H₂S/CO₂ co-existence environment was studied by mass loss method using high-temperature and high-pressure corrosion test kettle with magnetic drive shaft. Then, the surface morphology and composition of corrosion products of the four-point bending specimens after immersion corrosion were characterized by means of SEM and XRD. Results show that the average corrosion rate of 20# steel is higher than that of L245NS steel in H₂S/CO₂ containing medium. When a stress is applied on the test piece and/or the medium flows, the corrosion rate of both materials increases. The effect of stress on corrosion rate is more significant. The corrosion mechanism is speculated as follows: H₂S plays a leading role in the corrosion process and produces a protective FeS corrosion product film. The stress will lead to the formation of a large number of microscopic channels in the corrosion product film, which promotes the corrosion process. Fluid flow speeds up the dissolution of metals and the diffusion of corrosive substances, resulting in enhanced corrosion rates.

Key words： H₂S/CO₂ coexist corrosion rate stress velocity

收稿日期: 2020-02-25

ZTFLH:

TG174

通讯作者: 葛鹏莉 E-mail: gepl.xbsj@sinopec.com

Corresponding author: GE Pengli E-mail: gepl.xbsj@sinopec.com

作者简介: 葛鹏莉，女，1985年生，硕士，副研究员

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引用本文:

葛鹏莉, 曾文广, 肖雯雯, 高多龙, 张江江, 李芳. H₂S/CO₂共存环境中施加应力与介质流动对碳钢腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2021, 41(2): 271-276.
Pengli GE, Wenguang ZENG, Wenwen XIAO, Duolong GAO, Jiangjiang ZHANG, Fang LI. Effect of Applied Stress and Medium Flow on Corrosion Behavior of Carbon Steel in H₂S/CO₂ Coexisting Environment. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 271-276.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.025 或 https://www.jcscp.org/CN/Y2021/V41/I2/271

图1 实验装置图

图2 20#钢和L245NS钢在不同条件下浸泡后的宏观腐蚀形貌

图3 20#钢和L245NS钢在各条件下浸泡时的腐蚀速率

图4 20#钢在各条件下腐蚀后的微观形貌

图5 L245NS钢在各条件下腐蚀后的微观形貌

图6 20#钢和L245NS钢在各条件下浸泡后的腐蚀产物XRD谱

图7 碳钢在H2S/CO2环境中不同条件下的腐蚀机理

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