为了探讨不同碳链长度曼尼希碱的缓蚀性能及缓蚀机理,以丙酮、2-戊酮、2-辛酮为原料与甲醛、二乙胺反应,在pH =2 ～3下合成了3种不同碳链长度疏水基团的曼尼希碱缓蚀剂[1-二乙胺基-3-丁酮(DEAB)、1-二乙胺基-3-己酮(DEAH)、1-二乙胺基-3-壬酮(DEAN)];用元素分析仪、傅立叶红外光谱仪(FT-IR)对其结构进行表征;采用静态失重法考察了曼尼希碱分子结构中疏水基团碳链长度对其在15％盐酸中对N80钢缓蚀性能的影响,比较了其在N80钢片表面的吸附行为,并分析了缓蚀机理.结果表明:3种缓蚀剂的缓蚀性能与疏水基团中碳链长度相关,较高浓度下表现很明显;当缓蚀剂含量＜0.6％时,短碳链的缓蚀性能优于长碳链的,缓蚀率大小顺序为DEAB＞ DEAH＞ DEAN;当缓蚀剂含量≥0.6％时,疏水基团中碳链长度越长,缓蚀性能越好,缓蚀率大小顺序为DEAN＞ DEAH＞ DEAB,在缓蚀剂含量为1.0％时,DEAN对N80钢的缓蚀率可达98％;3种缓蚀剂在N80钢表面的吸附为自发过程,服从Langmuir吸附等温式,吸附类型是兼有物理吸附和化学吸附的混合型吸附.
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