2-十一烷基-N-羧甲基-N-羟乙基咪唑啉在柠檬酸溶液中对碳钢的缓蚀作用  

The Corrosion Inhibition of 2-Undecyl-N-CarboxymethylN-Hydroxyethyl Imidazoline on Carbon Steel in Citric Acid Solution

作　　者：廖强强[1] 陈亚琼[1] 闫爱军[2] 董万田 葛红花[1] 

机构地区：[1]上海电力学院,上海高校电力腐蚀控制与应用电化学重点实验室,上海热交换系统节能工程技术研究中心,上海200090 [2]陕西电力科学研究院,西安 [3]上海发凯化工有限公司,上海

出　　处：《应用化学》2011年第3期314-319,共6页Chinese Journal of Applied Chemistry

基　　金：上海市重点学科建设项目(P1304);上海高校电力腐蚀控制与应用电化学重点实验室开放基金资助项目(09KLSU01);上海热交换系统节能工程技术研究中心开放基金资助项目(09SERC03);上海市科委项目资助课题(08DZ2210800)

摘　　要：采用失重实验、极化曲线和交流阻抗等方法研究了缓蚀剂2-十一烷基-N-羧甲基-N-羟乙基咪唑啉在质量分数为2%柠檬酸溶液中对碳钢的缓蚀性能。失重实验表明,该缓蚀剂在柠檬酸溶液中能够有效地抑制碳钢的腐蚀,当其质量分数为0.4%时,缓蚀效率达到86.4%。极化曲线表明,该缓蚀剂为混合型缓蚀剂,Nyquist图中单一的容抗弧变化表明碳钢电极表面的腐蚀过程主要由电荷转移步骤控制。该缓蚀剂的吸附行为符合Langmuir吸附等温式,吸附机理是介于物理吸附和化学吸附之间的一种吸附。2-Undecyl-N-carboxymethyl-N-hydroxyethyl imidazoline was investigated as a corrosion inhibitor for carbon steel in 2% mass fracton of citric acid solution by means of mass loss test, polarization and AC impedance. The mass loss test results showed that the inhibitor was an excellent inhibitor for carbon steel in acid media with an inhibition efficiency of 86. 4% at the mass concentration of 0. 4%. The polarization curves indicated that the inhibitor behaved as a mixed type inhibitor while the single capacitive loop in the Nyquist plots revealed that the corrosion was a charge transfer controlled process. The adsorption of the inhibitor was found to follow the Langmuir adsorption isotherm and the involved mechanism consisted of a mixed adsorption between chemisorption and physisorption.

关 键 词：咪唑啉 缓蚀剂 柠檬酸 碳钢 

分 类 号：O646.1[理学—物理化学]