添加Cr和RE对碳钢抗CO2腐蚀性能的影响

王国富, 张玉玲, 邓叙燕, 张玲通, 田青超

doi:10.16577/j.issn.1001-1560.2024.0203

材料保护 >

2024 , Vol. 57 >Issue 9: 71 - 77

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0203

研究篇

添加Cr和RE对碳钢抗CO₂腐蚀性能的影响

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¹达力普石油专用管有限公司技术中心； ²上海大学省部共建高品质特殊钢冶金与制备国家重点实验室

田青超(1970-)，教授级高级工程师，博士，从事先进钢铁材料新产品研发工作，E-mail:tctian＠shu.edu.cn

收稿日期: 2024-03-02

修回日期: 2024-03-28

录用日期: 2024-03-29

网络出版日期: 2024-11-14

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The Effect of Adding Cr and RE on the CO₂ Corrosion Resistance of Carbon Steel

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(1.Technology Center， Dalipu Petroleum Special Pipe Co.， Ltd.， Cangzhou 061113， China；2.State Key Laboratory of Advanced Special Steel， Shanghai University， Shanghai 200444， China)

TIAN Qingchao(1970-)，Professor， Ph.D.， Research Focus: Research and Development of Advanced Steel Materials and New Products， E-mail:tctian＠shu.edu.cn

Received date: 2024-03-02

Revised date: 2024-03-28

Accepted date: 2024-03-29

Online published: 2024-11-14

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摘要

为研究添加Cr 和稀土(RE)对碳钢抗CO2腐蚀性的影响，采用25Mn2、1Cr 和1CrRE 钢使用高压釜模拟了井下腐蚀环境下的腐蚀行为。使用光学显微镜、扫描电子显微镜以及配套的能谱仪、X 射线衍射仪对3 种钢的腐蚀膜进行分析。结果表明，在碳钢中添加1Cr 能够降低腐蚀速率23%，而在1Cr 钢中添加RE 又能提高40%抗CO2腐蚀性能。研究发现，腐蚀膜主要由FeCO3和少量FeOOH 以及内层点状Fe3C 构成。 25Mn2 和1Cr 钢腐蚀膜呈双层结构，但1CrRE 钢腐蚀膜为三层结构，且Cr 元素在界面处富集。研究认为，腐蚀膜中的增碳现象是由于Fe3C与碳酸发生反应导致。稀土使得FeCO3晶面间距减小，利于FeCO3晶体生长的更为致密，但阻碍了离子传输，一方面利于抗CO2腐蚀，另一方面也使得1CrRE 钢的腐蚀膜呈三层结构。

关键词： 低合金钢; 二氧化碳腐蚀; 稀土合金化

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王国富, 张玉玲, 邓叙燕, 张玲通, 田青超 . 添加Cr和RE对碳钢抗CO₂腐蚀性能的影响[J]. 材料保护, 2024 , 57(9) : 71 -77 . DOI: 10.16577/j.issn.1001-1560.2024.0203

Abstract

In order to study the effect of adding Cr and rare earth (RE) on the CO2 corrosion resistance of carbon steel， 25Mn2， 1Cr and 1CrRE steels were used to simulate the corrosion behavior under the downhole corrosion environment in autoclave.The corrosion films on the three kinds of steels were analyzed by optical microscope， scanning electron microscope， energy spectrometer and X-ray diffractometer.Results showed that adding 1Cr to carbon steel could reduce the corrosion rate by 23%， and adding RE to 1Cr steel could increase the corrosion resistance of CO2 by 40%.It was found that the corrosion film was mainly composed of FeCO3 and a small amount of FeOOH， as well as dotted Fe3C in the inner layer.Additionally， the corrosion films of 25Mn2 and 1Cr steel had a two-layer structure， but the corrosion films of 1CrRE steel had a three-layer structure with the Cr element enrichment at the interface.Research suggested that the carbon pickup phenomenon observed in the corrosion film was caused by the reaction between Fe3 C and carbonic acid.Furthermore， rare earths reduced the spacing between FeCO3 crystal planes， which facilitated the denser growth of FeCO3 crystals and hindered ion transport.On the one hand， they were beneficial for CO2 corrosion resistance，and on the other hand，they also made the corrosion film of 1CrRE steel appear in a three-layer structure.

Key words： low-alloy steel; CO₂ corrosion; RE alloying

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