1-(2-苯基-硫脲乙基)-2-十五烷基-咪唑啉对Q235钢的缓蚀吸附作用  

Corrosion Inhibition and Adsorption of 1-(2-Phenyl-Thioureaethyl)-2-Phentadecyl-Imidazoline for Q235 Steel

作　　者：胡松青 胡建春[2] 石鑫[3] 贾晓林 郭文跃 

机构地区：[1]中国石油大学理学院,山东东营257061 [2]中国石油天然气管道第二工程公司,江苏徐州221008 [3]中国石化西北油田分公司防腐中心,新疆乌鲁木齐830011

出　　处：《石油学报（石油加工）》2011年第4期593-600,共8页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石油中青年创新基金(2008D-2006-02);中国石化普光气田缓蚀剂研究项目(309003)资助

摘　　要：合成了新型化合物1-(2-苯基-硫脲乙基)-2-十五烷基-咪唑啉(PSIM),采用失重法和电化学极化曲线方法就其在H_2S/CO_2共存的3%NaCl溶液中对Q235钢的缓蚀性能进行了研究,探讨了其在Q235钢表面的吸附行为。结果表明,PSIM具有较高的抗H_2S、CO_2腐蚀的性能,能同时抑制Q235钢的阴、阳极腐蚀反应过程,缓蚀效率随着其浓度的增加而提高,随着温度的升高而降低,并且具有较好的耐高温性能。PSIM在Q235钢表面上的吸附过程为自发、放热过程,吸附行为服从Langmuir吸附等温式,属于以化学吸附为主的混合吸附。同时采用量子化学方法计算了PSIM的电子结构参数,分析了PSIM的分子结构与其缓蚀性能之间的关系。1-（ 2-phenyl thioureaethyl ）-2-pentadecyl-imidazoline （PSIM） was synthesized. The corrosion inhibition performance and adsorption behavior of PSIM for Q235 steel in H2S and CO2 coexistence solution were studied by means of weight loss and polarization curve method. The results indicated that PSIM has excellent corrosion inhibition performance for Q235 steel, and both the cathodic and anodic processes in the corrosion were suppressed. The inhibition efficiency of PSIM for Q235 steel corrosion increased with the increase of PSIM concentration, while decreased with the rise of temperature, and PSIM has good high temperature resistance. The adsorption of PSIM molecule on Q235 steel surface followed the Langmuir isotherm equation, which was spontaneous and exothermic, and belonged to mix-type adsorption, mainly, dominated by chemisorptions. Quantum chemical approach was further used to calculate some electronic properties of PSIM molecule, in order to ascertain any correlation between molecular structure and the inhibition efficiency of PSIM.

关 键 词：缓蚀性能 失重法 极化曲线 吸附模型 量子化学 

分 类 号：TG174[金属学及工艺—金属表面处理]