二乙氨基甲基苯并三氮唑缓蚀剂的合成及其性能  

SYNTHESIS AND PROPERTIES OF CORROSION INHIBITOR DIETHYL AMINO METHYL BENZOTRIAZOLE

作　　者：王金刚[1] 刘旭洋 Wang Jingang;Liu Xuyang(School of Mechanical Engineering,Xi’an Shiyou University,Xi’an 710065)

机构地区：[1]西安石油大学机械工程学院,西安710065

出　　处：《石油炼制与化工》2020年第11期94-98,共5页Petroleum Processing and Petrochemicals

摘　　要：以甲醛(质量分数为40%)、苯并三氮唑和二乙胺为原料,经反应合成曼尼希碱缓蚀剂二乙氨基甲基苯并三氮唑(简称DMBM)。合成DMBM的优化反应条件:甲醛、二乙胺、苯并三氮唑物质的量比为3∶2∶3,反应温度为25℃,反应时间为0.5 h。使用红外光谱仪和核磁共振仪对合成产物进行结构表征,采用失重法考察其在10%盐酸溶液中对碳钢的缓蚀效果,结果表明:所合成的DMBM在酸性介质中有着良好的缓蚀效果;其通过分子中的苯并三氮唑环以及胺基上带孤对电子的N原子与金属表面发生吸附而抑制金属的腐蚀。在10%盐酸溶液中加入质量分数为2%的DMBM,测得50℃下碳钢的腐蚀速率为0.94 mm a,缓蚀率为93%。极化曲线测试结果表明,DMBM是以抑制阳极腐蚀反应为主的混合型缓蚀剂。Mannich(DMBM)base corrosion inhibitor,diethyl amino methyl benzotriazole was synthesized using formaldehyde(40%mass fraction)benzotriazole and diethylamine as raw materials.The optimal synthesis reaction conditions were:n(formaldehyde)∶n(diethylamine)∶n(benzotriazole)was 3∶2∶3,the reaction temperature was 25℃,and the reaction time was 0.5 h.The structures of the synthesized product were characterized by IR and NMR.The corrosion inhibition effect on carbon steel in 10%hydrochloric acid solution was investigated by weight loss method.The results showed that the synthesized DMBM had a good corrosion inhibition in an acidic medium duo to the adsorption of the benzotriazole ring in the molecule and the N atom with lone pair electrons on the amine group to the metal surface.By adding 2%DMBM into 10%hydrochloric acid solution,the corrosion rate of carbon steel at 50℃was measured as 0.94 mm a,and the corrosion inhibition rate was 93%.The polarization curve test showed that DMBM is a mixed inhibitor mainly for inhibiting anodic corrosion reaction.

关 键 词：苯并三氮唑 曼尼希碱 缓蚀剂 极化曲线 

分 类 号：TG174.42[金属学及工艺—金属表面处理] TE980[金属学及工艺—金属学]