二乙氨基甲基苯并三氮唑缓蚀剂的合成及其性能

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，釆用失重法考察其在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。

SYNTHESIS AND PROPERTIES OF CORROSION INHIBITOR DIETHYL AMINO METHYL BENZOTRIAZOLE

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 0.94mm /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.