恒定的pH值和Fe<sup>2+</sup>浓度下X65碳钢的CO<sub>2</sub>腐蚀行为

doi:10.11902/1005.4537.2017.195

中国腐蚀与防护学报

2018, Vol. 38

Issue (6): 573-578 DOI: 10.11902/1005.4537.2017.195

本期目录 | 过刊浏览

恒定的pH值和Fe²⁺浓度下X65碳钢的CO₂腐蚀行为

钟显康(

),扈俊颖

1. 西南石油大学石油与天然气工程学院油气藏地质及开发工程国家重点实验室成都 610500

Corrosion Behavior of X65 Carbon Steel in CO₂Containing Liquids with Constant pH and Ferrous Ion Concentration

Xiankang ZHONG(

),Junying HU

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China

全文: PDF(2360 KB) HTML

摘要:

在初始pH值为5.80和初始Fe²⁺浓度为20 mg/L的条件下，采用离子交换树脂调节腐蚀过程中的pH值和Fe²⁺浓度，使pH值和Fe²⁺浓度在整个腐蚀过程中保持恒定。采用开路电位测试、线性极化技术、扫描电镜等手段研究了X65钢的CO₂腐蚀行为，并与非恒定条件 (腐蚀过程中不调节pH值和Fe²⁺浓度) 下X65钢的CO₂腐蚀行为进行了对比。结果表明，在非恒定的pH值和Fe²⁺浓度下，X65钢的腐蚀速率在120 h后迅速下降，220 h后腐蚀速率约为0.5 mm/a，样品表面的FeCO₃膜完整且致密。在恒定的pH值和Fe²⁺浓度下，X65钢的腐蚀速率在160 h后才开始缓慢下降，220 h后腐蚀速率仍高达4.5 mm/a，样品表面FeCO₃膜的裂纹较多，且与基体之间存在明显间隙。因此，在密闭容器中维持相对恒定的pH值和Fe²⁺浓度对获得与油气田现场一致的CO₂腐蚀行为规律十分重要。

关键词 ：腐蚀, 碳钢, 离子交换, pH值, Fe²⁺

Abstract：

The corrosion test of carbon steel in a closed vessel with desired liquids will usually result in obviously changes in pH and ferrous ion concentration. However, in oil and gas field the pH and ferrous ion concentration at any specific location in side a pipeline does not change significantly with time. In this work, ion exchange resin was used to adjust the pH and ferrous ion concentration of the CO₂containing liquids during the corrosion process of X65 steel in a small loop, where the initial pH was 5.80 and initial ferrous ion concentration was 20 mg/L. In this case, the test loop full of CO₂containing liquids with constant pH and constant ferrous ion concentration was developed. Then, the corrosion of X65 steel in such an environment was investigated by open circuit potential, linear polarization resistance and surface analysis techniques. As a comparison, the corrosion of X65 carbon steel in liquid with inconstant pH and ferrous ion concentration (no adjustment for the pH and ferrous ion concentration during the corrosion) was also studied. The results showed that under the inconstant condition, the corrosion rate of X65 sharply decreased after 120 h. The corrosion rate was about 0.5 mm/a after 220 h. The corrosion product composed of very compact ferrous carbonate. However, under the condition of constant pH and ferrous ion concentration, the corrosion rate of X65 did not start to slowly decrease until 160 h; while the corrosion rate was still as high as 4.5 mm/a after 220 h. Many cracks in the corrosion products layer and obvious gaps between the substrate and corrosion product layer could also be found. Therefore, it is essential to maintain a relatively constant pH and ferrous ion concentration in a closed vessel of CO₂containing liquid when one tries to reproduce the CO₂corrosion behavior of carbon steel as that emerged in oil and gas field.

Key words： corrosion carbon steel ion exchange pH value ferrous ion

收稿日期: 2017-11-20

ZTFLH:

TG174.1

基金资助:国家自然科学基金(51601159);四川省应用基础研究项目(2017JY0171)

通讯作者: 钟显康 E-mail: zhongxk@swpu.edu.cn

Corresponding author: Xiankang ZHONG E-mail: zhongxk@swpu.edu.cn

作者简介: 钟显康，男，1984年生，博士，研究员

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引用本文:

钟显康,扈俊颖. 恒定的pH值和Fe²⁺浓度下X65碳钢的CO₂腐蚀行为[J]. 中国腐蚀与防护学报, 2018, 38(6): 573-578.
Xiankang ZHONG, Junying HU. Corrosion Behavior of X65 Carbon Steel in CO₂Containing Liquids with Constant pH and Ferrous Ion Concentration. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 573-578.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.195 或 https://www.jcscp.org/CN/Y2018/V38/I6/573

图1 pH值和Fe2+浓度控制装置示意图

图2 加入和不加入H型离子交换树脂时X65碳钢腐蚀过程中pH值随时间的变化曲线

图3 加入和不加入Na型离子交换树脂时X65碳钢腐蚀过程中Fe2+浓度随时间的变化曲线

图4 恒定和非恒定pH值和Fe2+浓度条件下X65碳钢在1%NaCl溶液中腐蚀220 h后的表面腐蚀产物横截面SEM像

图5 X65碳钢在恒定和非恒定的pH值和Fe2+浓度条件下腐蚀电位随时间的变化曲线

图6 X65钢在恒定和非恒定的pH值和Fe2+浓度条件下的腐蚀速率随时间变化曲线

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