咪唑基复配缓蚀剂抗二氧化碳腐蚀的缓蚀协同效应研究

发布时间：2018-05-21 19:13

本文选题：CO2腐蚀 + 缓蚀剂　；参考：《延安大学》2015年硕士论文

【摘要】：在油气管道运输过程中,管道腐蚀老化问题不仅对管道的运输会带来严重的经济损失,还会造成人员伤亡。因此,在油气管道运输中,做好管道防腐是一项重要的工作。目前,有复合管、碳钢+缓蚀剂、防腐涂层、衬塑等防腐技术,但是,由于复合管、衬塑等技术成本较高,因此,缓蚀剂防腐就逐渐成为普遍采用的防腐技术。缓蚀剂防腐是通过向油气管道中添加缓蚀剂,进而减弱管道的腐蚀速率来达到减缓油气管道腐蚀的目的。按照延安地区油气管道内积水水质,以二氧化碳为腐蚀因素,配制了模拟腐蚀溶液。采用咪唑为主剂,以甲基丁炔醇、表面活性剂为辅剂,制备了不同种类的复配缓蚀剂。利用失重法和SEM手段分析了复配缓蚀剂对N80钢和A3钢的缓蚀效果。以咪唑为主剂,甲基丁炔醇为辅剂,通过改变咪唑和甲基丁炔醇的体积比,制备了系列复配缓蚀剂,研究复配缓蚀剂对N80钢、A3钢的缓蚀效果。结果表明,制备的系列复配缓蚀剂对N80钢缓蚀率均可达到74%以上,对A3钢的缓蚀率均可达到87%以上。当咪唑(wt%=0.8%)和甲基丁炔醇的体积比为100:10时复配的缓蚀剂对N80钢、A3钢的缓蚀效果最明显,对N80钢的缓蚀率为88%,而对A3钢的缓蚀率都可达到94%。同时研究了添加最优复配缓蚀剂前后N80钢、A3钢的表面微观结构,结果表明,在未加入缓蚀剂的情况下,该钢片表面腐蚀严重,属于均匀腐蚀,表面有明显的裂纹,添加了复配缓蚀剂后,N80钢和A3钢表面腐蚀得到了较好的抑制,裂纹明显降低。说明复配缓蚀剂对两种钢片都起到了缓蚀作用,且复配好的缓蚀剂之间表现出较好的协同作用。通过改变咪唑和1-氯代十二烷的体积比,制备了系列复配缓蚀剂,研究复配缓蚀剂对N80钢、A3钢的缓蚀效果。结果表明,制备的系列复配缓蚀剂对N80钢的缓蚀率均可达到68.9%以上,对A3钢的缓蚀率均可达到84.5%以上。当咪唑(wt%=0.8%)和1-氯代十二烷的体积比为100:20时复配的缓蚀剂对N80钢、A3钢的缓蚀效果最明显,对N80钢的缓蚀率为81.1%,而对A3钢的缓蚀率都可达到92.2%。同时SEM结果表明,添加了最优复配缓蚀剂后,N80钢和A3钢表面腐蚀得到了较好的抑制,裂纹明显降低,说明复配缓蚀剂对两种钢片都起到了缓蚀作用,且复配好的缓蚀剂之间表现出较好的协同作用。
[Abstract]:In the process of oil and gas pipeline transportation, pipeline corrosion aging will not only bring serious economic loss to pipeline transportation, but also cause casualties. Therefore, it is an important work to do pipeline anticorrosion well in oil and gas pipeline transportation. At present, there are many anticorrosive technologies such as composite pipe, carbon steel corrosion inhibitor, anticorrosive coating, plastic lining, etc. However, due to the high cost of composite pipe and plastic lining technology, corrosion inhibitor anticorrosion has gradually become a popular anticorrosive technology. Corrosion inhibitor anticorrosion is to reduce the corrosion rate of oil and gas pipeline by adding corrosion inhibitor to oil and gas pipeline. According to the water quality of oil and gas pipeline in Yan'an area, simulated corrosion solution was prepared with carbon dioxide as corrosion factor. Different kinds of complex corrosion inhibitors were prepared by using imidazole as main agent, methyl buynyl alcohol and surfactant as adjuvant. The corrosion inhibition effect of composite corrosion inhibitor on N80 steel and A3 steel was analyzed by weight loss method and SEM method. A series of complex corrosion inhibitors were prepared by changing the volume ratio of imidazole and methyl buynyl alcohol with imidazole as the main agent and methyl buynyl alcohol as the auxiliary agent. The corrosion inhibition effect of the complex inhibitor on N80 steel was studied. The results show that the corrosion inhibition rate of N80 steel and A3 steel can be over 74% and 87% respectively. When the volume ratio of imidazolium and methyl buynyl alcohol is 100: 10, the inhibition effect of the complex inhibitor on N80 steel is the most obvious, the inhibition rate for N80 steel is 88% and the inhibition rate for A3 steel is up to 94 pieces. At the same time, the surface microstructure of N80 steel and A3 steel before and after the addition of the optimum corrosion inhibitor was studied. The results show that the surface corrosion of the steel sheet is serious, it belongs to uniform corrosion, and there are obvious cracks on the surface without the addition of corrosion inhibitor. The surface corrosion of N80 steel and A3 steel was well inhibited and the crack was obviously reduced with the addition of complex corrosion inhibitor. The results show that the composite corrosion inhibitor can inhibit the corrosion of the two steel sheets, and the synergistic effect between the two kinds of corrosion inhibitors is good. A series of complex corrosion inhibitors were prepared by changing the volume ratio of imidazole and 1-chloro dodecane. The corrosion inhibition effect of the complex inhibitor on N80 steel was studied. The results showed that the corrosion inhibition rate of N80 steel and A3 steel were above 68.9% and 84.5% respectively. When the volume ratio of 1-chloro-dodecane is 100: 20, the corrosion inhibitor is the most effective inhibitor on N80 steel, the inhibition rate is 81.1% for N80 steel and 92.22% for A3 steel. At the same time, the SEM results showed that the surface corrosion of N80 steel and A3 steel was inhibited and the crack was obviously reduced with the addition of optimum corrosion inhibitor, which indicated that the corrosion inhibitor could inhibit the corrosion of both steels. And the complex corrosion inhibitor showed good synergistic effect.
【学位授予单位】：延安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG174.42

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