阳离子型可聚合咪唑类离子液体-丙烯酰胺共聚物的制备及其对盐酸腐蚀碳钢缓蚀行为

摘要/Abstract

摘要：

利用阳离子型可聚合离子液体1-丙烯酰氧乙基-3-甲基咪唑四氟硼酸盐与丙烯酰胺的反相微乳液共聚合,制备了阳离子型咪唑类离子液体-丙烯酰胺共聚物缓蚀剂,并探讨了其缓蚀性能。研究了不同阳离子度、不同浓度聚合物溶液的缓蚀性能以及吸附时间对盐酸腐蚀碳钢速率的影响,并初步讨论了缓蚀机理。研究表明,该种阳离子型缓蚀剂的缓蚀效率可达90%以上;缓蚀剂的缓蚀能力不仅取决于缓蚀剂的阳离子度,还取决于该种缓蚀剂的相对分子质量;缓蚀效率并非简单地随聚合物浓度的增加而提高,当聚合物溶液的浓度过高时,反而会使缓蚀效率下降;随吸附时间的延长,碳钢的腐蚀速率逐渐降低,约40 h后基本保持不变;加入缓蚀剂有效抑制了酸对铁的腐蚀,随缓蚀效率的提高,碳钢表面的粗糙程度明显降低,孔洞结构减少。

关键词: 阳离子型可聚合咪唑类离子液体, 离子液体-丙烯酰胺共聚物, 阳离子度, 缓蚀剂, 缓蚀机理

Abstract:

Cationic polymerizable imdazolium ionic liquid-acrylamide copolymers as the corrosion inhibitors were successfully prepared by copolymerization of hydrophilic polymerizable ionic liquid, 1-methyl-3-[2-[(1-oxo-2-propenyl)oxy]ethyl]imdazoliumtetrafluoroborate(ACIMBF₄), with acrylamide via inverse microemulsion polymerization. Various impact factors on the inhibition of carbon steel corrosion by hydrochloric acid including the cationic degree, the relative molecular mass of the copolymer, the concentration of copolymer solution and the absorption time were investigated simultaneously, and the corrosion mitigation mechanism was also discussed preliminary. The corrosion inhibition efficiency of cationic ionic liquid-acrylamide copolymers can reach higher than 90% by forming a protective adsorption film on the carbon steel. The corrosion inhibition ability of cationic copolymer depends on not only its cationic degree but also its relative molecular mass. Moreover, the corrosion inhibition efficiency increases with the increase of the concentration of cationic poly(ionic liquid) copolymer, and then decreases when the concentration of copolymer solution is too high. Furthermore, with the extension of the adsorption time, the corrosion rate of carbon steel is reduced gradually, and remains constant after approximately 40 h, namely the absorbing capacity of inhibitor on the carbon steel reaches the maximum.

Key words: cationic polymerizable imdazolium ionic liquid, ionic liquid-acrylamide copolymer, cationic degree, corrosion inhibitor, corrosion mitigation mechanism

丁红霞, 武英, 刘正平. 阳离子型可聚合咪唑类离子液体-丙烯酰胺共聚物的制备及其对盐酸腐蚀碳钢缓蚀行为[J]. 应用化学.

DING Hongxia, WU Ying, LIU Zhengping. Preparation of Cationic Polymerizable Imdazolium Ionic Liquid-Acrylamide Copolymers and Their Inhibition Behaviors for Carbon Steel Corrosion in Hydrochloric Acid[J]. Chinese Journal of Applied Chemistry.

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阳离子型可聚合咪唑类离子液体-丙烯酰胺共聚物的制备及其对盐酸腐蚀碳钢缓蚀行为

Preparation of Cationic Polymerizable Imdazolium Ionic Liquid-Acrylamide Copolymers and Their Inhibition Behaviors for Carbon Steel Corrosion in Hydrochloric Acid

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