NT80SS钢在高含H<sub>2</sub>S/CO<sub>2</sub>环境中的腐蚀行为

中国腐蚀与防护学报

2009, Vol. 29

Issue (3): 225-229

研究报告

本期目录 | 过刊浏览

NT80SS钢在高含H₂S/CO₂环境中的腐蚀行为

李春福¹;邓洪达^1;2;崔世华¹

1. 西南石油大学油气藏地质与开发工程国家重点实验室成都 610500
2. 重庆科技学院冶金与材料工程学院重庆 401331

CORROSION BEHAVIOR OF NT80SS STEEL IN ENVIRONMENT OF HIGH CONTENTS OF H₂S AND CO₂

LI Chunfu¹; DENG Hongda^1;2;CUI Shihua¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Chengdu 610500
2. School of Metallurgical and Materials Engineering; Chongqing University of Science and Technology; Chongqing 401331

全文: PDF(912 KB)

摘要:

本文采用失重腐蚀方法研究了NT80SS套管钢在模拟罗家寨气田井下腐蚀环境中腐蚀规律及其腐蚀影响因素（总压、温度、腐蚀时间、Cl-、流速），并采用动电位扫描技术、交流阻抗技术（SEM）和扫描电镜（SEM）分析了腐蚀产物膜电化学特性和形貌。结果表明：60℃为NT80SS钢在H2S/CO2环境中腐蚀临界温度，在此环境中腐蚀速率最低；当总压大于等于9MPa时，在温度为120℃环境中腐蚀速率比在相同总压、温度为90℃环境中腐蚀速率小；随腐蚀时间延长，腐蚀速率明显降低；Cl－离子促进钢的腐蚀；流速增加，腐蚀速率增加；另外，与其它温度环境相比，在60℃环境中钢腐蚀产物膜的阻抗能力强、阳极极化率高，膜的致密性最好，因此腐蚀速率最低。

关键词 ： NT80SS;H2S/CO2共存环境;腐蚀行为;腐蚀影响因素

Abstract：

Corrosion behavior and corrosion influencing factors(total pressure, temperature, corrosion time, Cl^-, velocity of flow) of NT80SS casing steels were studied in simulating corrosion environment with high contents of H₂S and CO₂ in Luojiazhai Gas Field by loss weight corrosion, and corrosion scale was analyzed by potentiodynamically scan, electrochemical impedance spectroscope(EIS) and scanning electron microscope(SEM). The results show that 60 ℃ was the temperature at which corrosion rate of NT80SS steel was the lowest among temperatures tested in this paper. When the total pressure was 9 MPa or above it, corrosion rate at 120 ℃ was lower than that at 90 ℃. However, the total pressure was less than 9 MPa, the result is contrary. Corrosion rate was decreasing with time prolonging; Cl^- promoted corrosion of steel. Corrosion rate increased with acce-\linebreak lerated velocity of flow. The electrochemical experiments show that: in the range of 30 ℃-120 ℃, Resistance performance and compact character of the corrosion scale formed at 60 ℃ was the most outstanding among those formed at others temperature, and the anodic polarization rate is high, so corrosion rate of the steel at 60 ℃ is the lowest.

Key words： NT80SS steel;H2S/CO2;corrosion behavior;corrosion factor

收稿日期: 2007-10-25

ZTFLH:

TG174

基金资助:

油气藏地质与开发工程国家重点实验室开放基金项目资助（NO.LN0609）

通讯作者: 李春福 E-mail: lichunfu10@163.com

Corresponding author: LI Chunfu E-mail: lichunfu10@163.com

作者简介: 李春福，1947年生，教授，研究方向为H2S/CO2腐蚀与防护及相应材料计算设计

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引用本文:

李春福邓洪达崔世华. NT80SS钢在高含H₂S/CO₂环境中的腐蚀行为[J]. 中国腐蚀与防护学报, 2009, 29(3): 225-229.
LI Chun-Fu. CORROSION BEHAVIOR OF NT80SS STEEL IN ENVIRONMENT OF HIGH CONTENTS OF H₂S AND CO₂. J Chin Soc Corr Pro, 2009, 29(3): 225-229.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2009/V29/I3/225

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