流速和碳链长度对咪唑啉衍生物在高压CO<sub>2</sub>环境中缓蚀性能的影响

doi:10.11902/1005.4537.2014.050

中国腐蚀与防护学报

2015, Vol. 35

Issue (2): 163-168 DOI: 10.11902/1005.4537.2014.050

本期目录 | 过刊浏览

流速和碳链长度对咪唑啉衍生物在高压CO₂环境中缓蚀性能的影响

赵桐¹, 赵景茂^1,²(

), 姜瑞景^1,²

1. 北京化工大学材料科学与工程学院北京 100029
2. 北京化工大学材料电化学过程与技术北京市重点实验室北京 100029

Effect of Flow Velocity and Carbon Chain Length on Corrosion Inhibition Performance of Imidazoline Derivates in High Pressure CO₂ Environment

ZHAO Tong¹, ZHAO Jingmao^1,²(

), JIANG Ruijing^1,²

1. College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2. Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China

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摘要:

合成了5种碳链长度不同的咪唑啉衍生物以及两种碳链中带有双键的咪唑啉衍生物。通过动态失重、SEM、AFM和接触角测定等分析表征手段,研究了它们在碳钢表面上的吸附能力与疏水能力以及在高压CO₂环境中在3种流速下对碳钢腐蚀的缓蚀性能。结果表明,咪唑啉碳数为21时疏水效果最好,其浓度为50,100和200 mg/L时,接触角分别为80.5°,87.8°和96.2°。通过测量力曲线,同样发现随碳链的增长,其粘附力逐渐增大,当碳数为21时,粘附力达到最大。高压釜动态失重实验表明,缓蚀剂的缓蚀性能与碳链的长度以及溶液流速有关。流速为0.3和0.6 m/s时,碳数为17时缓蚀效果最好；流速为5.5 m/s时,碳链越长,缓蚀效果越好。同样条件下,碳链中带有双键的咪唑啉的缓蚀效果总是优于碳链中没有双键的咪唑啉的缓蚀效果。

关键词 ： CO₂腐蚀, 缓蚀剂, 流速, 咪唑啉衍生物, 碳链长度

Abstract：

Five imidazoline derivates with different carbon chain length and two imidazoline derivates with double bond in carbon chain were synthesized. Their inhibition performance, adsorption capacity and hydrophobicity were studied in high CO₂ pressured solution by means of dynamic mass loss method, SEM, AFM, and contact angle measurement. By contact angle measurement, it was found that the hydrophobic performance of imidazoline derivate with 21 carbon chain length was the best, and the contact angle was 80.5°, 87.8° and 96.2° respectively corresponding to its concentration of 50, 100 and 200 mg/L. By the AFM force curves, it was also found that the longer the carbon chain, the larger the adhesion force. When the chain length was 21, the adhesion reached the highest. The dynamic weight loss experiment showed that the inhibition performance of the imidazoline derivates was related to both the chain length and the flow velocity of the solution. When the flow rate was 0.3 and 0.6 m/s, the derivate with 17 carbons in carbon chain was the best and when the flow rate was 5.5 m/s, the longer the carbon chain of imidazoline, the better the inhibition performance. The inhibition performance of imidazoline with double bonds in carbon chain was always better than the one without double bonds under the same condition.

Key words： CO₂ corrosion corrosion inhibitor flow velocity imidazoline derivate carbon chain length

收稿日期: 2014-05-19

ZTFLH:

TG174.42

基金资助:国家自然科学基金项目 (51171013) 资助

作者简介: null

赵桐，男，1989年生，硕士生

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引用本文:

赵桐, 赵景茂, 姜瑞景. 流速和碳链长度对咪唑啉衍生物在高压CO₂环境中缓蚀性能的影响[J]. 中国腐蚀与防护学报, 2015, 35(2): 163-168.
Tong ZHAO, Jingmao ZHAO, Ruijing JIANG. Effect of Flow Velocity and Carbon Chain Length on Corrosion Inhibition Performance of Imidazoline Derivates in High Pressure CO₂ Environment. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 163-168.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.050 或 https://www.jcscp.org/CN/Y2015/V35/I2/163

表1 吸附了不同碳链链长的咪唑啉衍生物后N80碳钢表面的接触角平均值

图1 吸附不同链长咪唑啉衍生物后的碳钢试片表面的力曲线

图2 加入不同疏水基的咪唑啉衍生物后碳钢在3种流速下的腐蚀速率

图3 3种流速下不同链长的咪唑啉衍生物的缓蚀率与接触角及缓蚀率与粘附力曲线

图4 咪唑啉衍生物碳链中的双键对碳钢腐蚀速率的影响

图5 流速为0.3 m/s条件下分别加入5种缓蚀剂后碳钢表面的腐蚀形貌

图6 流速为0.6 m/s条件下分别加入5种缓蚀剂后碳钢表面的腐蚀形貌

图7 流速为5.5 m/s条件下分别加入5种缓蚀剂后碳钢表面的腐蚀形貌

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