以肉桂醛、苯乙酮、多胺和甲醛为原料，通过曼尼希反应合成多曼尼希碱型酸化缓蚀剂M-4A，通过单因素法对合成条件进行优选的结果：温度70～80℃，时间6～7 h，n（肉桂醛）∶n（二乙烯三胺）∶n（苯乙酮）∶n（甲醛）=（1.1～1.2）∶1.0∶（2.1～2.3）∶（1.1～1.2）。采用FTIR和SEM等方法对最优产物结构进行表征，分析M-4A在酸液介质中的缓蚀性能及与KI和CuBr复配后的缓蚀性能。实验结果表明，在90℃下的20%（w）HCl和土酸（HF 3%（w）+ HCl 12%（w））中，M-4A最佳加入量（w）分别为0.5%和0.7%，A3钢的腐蚀速率为3.95 g/（m2·h）和3.05 g/（m2·h），缓蚀率高达99.92%和99.90%。M-4A分别与KI和CuBr 增效剂复配后缓蚀性能提高，在20%（w）的HCl中，当KI和CuBr与M-4A的质量比为1∶3复配后，A3钢的腐蚀速率最小为0.96 g/（m2·h）和2.67 g/（m2·h）。%In order to inhibit the corrosion of acid solutions to metal equipments used in oilfield acidification,a multi-Mannich base corrosion inhibitor,M-4A,was synthesized through the Mannich reaction from cinnamic aldehyde,acetophenone,diethylenetriamine and formaldehyde. The synthesis conditions were optimized by single factor method,and the optimal product was characterized by means of FTIR and SEM. The corrosion inhibition efficiency of M-4A in acid solution was evaluated by means of TG and SEM. The results showed that,The optimal conditions for the synthesis were temperature of 70-80℃,reaction time of 6-7 h andn(cinnamic aldehyde)∶n(diethylenetriamine)∶n(acetophenone)∶n(formaldehyde) of (1.1-1.2)∶1.0∶(2.1-2.3)∶(1.1-1.2). At 90℃ in 20%(w) hydrochloric acid solution and mud acid (3%(w) HF + 12%(w) HCl) solution,the optimal M-4A dosages were 0.5%(w) and 0.7%(w),the corrosion rates of A3 steel sheet were 3.95 g/(m2·h) and 3.05 g/(m2·h),and the inhibition efficiency achieved 99.92% and 99.90%,respectively. When M-4A was composited with two synergists of KI and CuBr separately,its inhibition performance was significantly enhanced. When the mass ratio of KI or CuBr to M-4A was 1∶3, the minimal corrosion rates of A3 steel sheet were 0.96 g/(m2·h) and 2.67 g/(m2·h),respectively.
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