田永强,付安庆,胡建国,郑欣,胥聪敏,任康,吕乃欣,李文升,尹成先,袁军涛.低Cr钢在CO2/H2S环境中的腐蚀行为研究[J].表面技术,2019,48(5):49-57.
TIAN Yong-qiang,FU An-qing,HU Jian-guo,ZHENG Xin,XU Cong-min,REN Kang,LYU Nai-xin,LI Wen-sheng,YIN Cheng-xian,YUAN Jun-tao.Corrosion Behavior of Low Cr Steel in CO2/H2S Environment[J].Surface Technology,2019,48(5):49-57 |
| 低Cr钢在CO2/H2S环境中的腐蚀行为研究 |
| Corrosion Behavior of Low Cr Steel in CO2/H2S Environment |
| 投稿时间：2019-03-12 修订日期：2019-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.05.008 |
| 中文关键词: 低Cr钢 微观组织 硫化氢腐蚀 二氧化碳腐蚀 硫化亚铁 |
| 英文关键词:low Cr steel microstructure hydrogen sulfide corrosion carbon dioxide corrosion iron sulfide |
| 基金项目:陕西省自然科技基础研究计划（2018JQ5048）；中国石油天然气股份有限公司重大科技专项（2016E-05）；西安石油大学研究生创新与实践能力培养计划资助项目（YCS18212048） |
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| Author | Institution |
| TIAN Yong-qiang | 1.Xi'an Shiyou University, Xi'an 710065, China; 2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China; 3.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
| FU An-qing | 2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China; 3.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
| HU Jian-guo | 4.Xi’an Changqing Technology Engineering Co., Ltd, Xi’an 710021, China |
| ZHENG Xin | 4.Xi’an Changqing Technology Engineering Co., Ltd, Xi’an 710021, China |
| XU Cong-min | 1.Xi'an Shiyou University, Xi'an 710065, China |
| REN Kang | 1.Xi'an Shiyou University, Xi'an 710065, China; 2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China; 3.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
| LYU Nai-xin | 2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China; 3.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
| LI Wen-sheng | 2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China; 3.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
| YIN Cheng-xian | 2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China; 3.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
| YUAN Jun-tao | 2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China; 3.CNPC Tubular Goods Research Institute, Xi'an 710077, China |
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| 中文摘要: |
| 目的 研究低Cr钢（3%~9%）在60 ℃的CO2/H2S环境中的腐蚀行为。方法 将三种低Cr钢（3Cr-H、5Cr-H、9Cr-H）加热到900 ℃之后，保温40 min，进行水冷。对热处理之后的钢试样（依次编号3Cr-H、5Cr-H、9Cr-H）进行高温高压CO2/H2S腐蚀模拟实验，通过扫描电子显微镜（SEM）、能谱分析仪（EDS）和X射线衍射仪（XRD）对腐蚀产物膜的微观形貌和成分以及物相组成进行分析。结果 3Cr、5Cr、9Cr钢的腐蚀速率分别为0.0443、0.0372、0.0060 mm/a，且腐蚀速率随着Cr含量的增加而降低。3Cr-H、5Cr-H、9Cr-H钢的腐蚀速率分别为0.1527、0.0445、0.0070 mm/a，其腐蚀速率也是随着Cr含量的增加而降低。其中，3Cr-H钢的腐蚀速率是3Cr钢的3.4倍，耐蚀性能变化明显。5Cr-H钢的腐蚀速率是5Cr钢的1.19倍。9Cr-H钢的腐蚀速率与9Cr钢相比，几乎没有差别。六种材料的腐蚀产物均为FeS化合物，并没有发现典型的FeCO3晶体（CO2腐蚀产物）。3Cr、5Cr、3Cr-H、5Cr-H钢的腐蚀产物均为双层膜结构，9Cr、9Cr-H钢的腐蚀产物为单层膜结构。结论 热处理未影响腐蚀速率随Cr含量的变化趋势，基体中Cr含量越高，腐蚀产物膜中的Cr富集量越大，从而有助于降低其腐蚀速率。热处理对3Cr钢的显微组织及其腐蚀行为影响最为显著，不仅加剧了其均匀腐蚀，而且促进了点蚀的发生，这是因为热处理后，显微组织中析出第二相含Cr的碳化物，使部分区域出现了贫Cr的现象。 |
| 英文摘要: |
| The work aims to study the corrosion behavior of low Cr steels (3%~9%) in CO2/H2S environment at 60 ℃. Three kinds of low Cr steels were heated to 900 ℃ and then water-cooled for 40 minutes. CO2/H2S corrosion tests were carried out to 3Cr-H, 5Cr-H and 9Cr-H steel samples in an autoclave. Morphologies, compositions and phase of corrosion products were analyzed by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). The corrosion rates of 3Cr, 5Cr and 9Cr steels were 0.0443, 0.0372 and 0.006 mm/a, respectively. The corrosion rates decreased with the increase of Cr content. The corrosion rates of 3Cr-H, 5Cr-H and 9Cr-H steels were 0.1527, 0.0445 and 0.007 mm/a, respec-tively. The corrosion rates also decreased with the increase of Cr content. The corrosion rate of 3Cr-H steel was 3.4 times that of 3Cr steel, and the corrosion resistance changed obviously. The corrosion rate of 5Cr-H steel was 1.19 times that of 5Cr steel. The corrosion rate of 9Cr-H steel was almost the same as that of 9Cr steel. The corrosion products of the six materials were all FeS compounds, and no typical FeCO3 crystals (CO2 corrosion product) were found. The corrosion products of 3Cr, 5Cr, 3Cr-H and 5Cr-H steels were of double-layer structure, while those of 9Cr and 9Cr-H steels were of single-layer structure. Heat treatment does not affect the trend between the content of Cr and corrosion rate. The higher the content of Cr in the matrix is, the greater the concentration of Cr in the corrosion product film, which helps to reduce the corrosion rate; Heat treatment has the most significant effect on the microstructure and corrosion behavior of 3Cr steel, which not only aggravates the uniform corrosion, but also promotes pitting corrosion. This is due to the precipitation of second phase carbides containing Cr in the microstructure after heat treatment, thus resulting in the phenomenon of poor Cr in some areas. |
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