| 引用本文: | 宋文明,杨贵荣,董雪娇,王富强,李健,马颖.20#钢在CO2/H2O气液两相塞状流中的腐蚀行为[J].哈尔滨工业大学学报,2017,49(11):115.DOI:10.11918/j.issn.0367-6234.201704015 |
| SONG Wenming,YANG Guirong,DONG Xuejiao,WANG Fuqiang,LI Jian,MA Ying.The Corrosion Behavior of 20# Steel in CO2/H2O Two Phase Plug Flow[J].Journal of Harbin Institute of Technology,2017,49(11):115.DOI:10.11918/j.issn.0367-6234.201704015 |
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| 20#钢在CO2/H2O气液两相塞状流中的腐蚀行为 |
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宋文明1,2,杨贵荣1,董雪娇Symbol`@@1,王富强1,李健3,马颖1
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(1.省部共建有色金属先进加工与再利用国家重点实验室(兰州理工大学),兰州 730050; 2.甘肃蓝科高新石化装备股份有限公司,兰州 730070;3.武汉材料保护研究所,武汉 430030)
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| 摘要: |
| 采用自主设计动态腐蚀实验装置研究20#钢在CO2/H2O两相塞状流条件下的腐蚀行为，利用失重法、SEM、EDS和XRD等手段对腐蚀试样进行腐蚀速率分析、腐蚀形貌观察以及腐蚀产物成分与膜层结构特征分析.结果表明：随时间的延长腐蚀速率呈先小幅减小、后快速增大、再明显降低的趋势，4h和8h分别达实验条件下的最大值(2.074 6 mm/a)和最小值(1.898 8 mm/a)；下管壁腐蚀形貌特征表明随时间延长腐蚀产物膜层由初始阶段疏松团絮状产物+细小针状产物组成含有微裂纹的单层腐蚀产物膜层逐渐转变为双层腐蚀产物膜，外层膜疏松其具有贯穿性裂纹，而内层膜相对致密并随时间延长致密度逐渐提高，EDS分析结果表明内层相对致密膜层的铁含量高于外层膜，属于富铁腐蚀产物，外层相对疏松膜层的碳氧元素含量之和相比内层膜较高；在同时间段上管壁腐蚀产物沿垂直流动方向呈条带状分布，由初始粗大疏松产物颗粒逐渐转变为具有规则排列特征的晶粒；腐蚀产物主要由Fe、C、O三种主要元素组成，主要组成相有Fe3C、FeCO3、Fe3O4、FeOOH.
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| 关键词: CO2腐蚀 两相塞状流 产物形貌特征 腐蚀行为机制 |
| DOI：10.11918/j.issn.0367-6234.201704015 |
| 分类号:TG172.3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51205178)；甘肃省自然科学基金(145YJYA308) |
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| The Corrosion Behavior of 20# Steel in CO2/H2O Two Phase Plug Flow |
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SONG Wenming1,2,YANG Guirong1,DONG Xuejiao1,WANG Fuqiang1,LI Jian3,MA Ying1
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(1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals (Lanzhou University of Technology), Lanzhou 730050, China; 2. Lanpec Technologies Limited, Lanzhou 730070, China; 3.Wuhan Research Institute of Materials Protection, Wuhan 430030, China)
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| Abstract: |
| The corrosion behavior of 20# steel was studied under CO2/H2O two phase plug flow condition using self-designed experiment device. The corrosion rate, corrosion appearance, the composition of corrosion products and the structure characteristics of film were investigated through weight loss method, scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and X-Ray diffraction (XRD), respectively. The results show that the trend of corrosion rate first slightly decreases followed by a rapid increase, and then dramatically decreases with the increasing of corrosion time. The maximum (2.074 6 mm/a) and minimum (1.898 8 mm/a) value reached at 4 h and 8 h, respectively. The corrosion characteristics of corrosion products on the bottom pipe wall by the beginning of the single layer of loose flocculent and tine needle product change into double films of corrosion product gradually. The outer layer with micro-crack is loose, but the inner is relatively dense and its density is increasing with time. The EDS analysis results confirm that the inner dense layer belongs to rich iron product because the Fe content is higher than that of outer layer, and the content of C/O elements in outer loose layer is relatively high. At the same time period the corrosion products at the top wall of pipe are a zonal distribution along the vertical direction of flow, and the bulky loose particles at initial stage gradually transform into crystal grain with regular arrangement. Corrosion products mainly consist of Fe, C, O and the composition mainly includes Fe3C, FeCO3, Fe3O4 and FeOOH.
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| Key words: CO2 corrosion two phase plug flow characteristic of corrosion products mechanism of corrosion behavior |
