Abstract: Oleic acid imidazoline HS11 is synthesized from oleic acid and diethylene triamine. Inhibitor’s performance is evaluated by weight-loss method and the effect after matching with commonly used inhibitors JCCR1138 and Gaowen is also researched. The corrosion mechanism of the water cooler system in viscosity breaking unit is analyzed by means of X-ray diffraction.The results indicate that main corrosion form is not only the oxidation corrosion, but also HCl-H2S-H2O in low temperature, and the sulfur corrosion in the latter plays a main role. HS11 has the best inhibitive effect with 200 μg/g, and the inhibitive rate is up to 74.31% . HS11 mixed with inhibitor Gaowen is better than with inhibitor JCCR1138, and the inhibitive efficiency of it comes to 89.84% when the add level is 200 μg/g respectively. 

Key words: 　Corrosion , Steel 20 , Inhibitor , Imidazoline , Inhibitive rate

摘要：         以油酸、二乙烯三胺为原料，合成了油酸咪唑啉缓蚀剂ＨＳ１１。采用失重法研究了缓蚀剂ＨＳ１１及其与油田常用的缓蚀剂ＪＣＣＲ１１３８、高温缓蚀剂复配后对２０钢的缓蚀效果，并结合现场腐蚀产物进行了ＸＲＤ衍射图谱分析，研究了稠油减粘裂化装置冷却器的腐蚀原因。结果表明：冷却器内同时存在氧化腐蚀和低温ＨＣｌ－Ｈ_２ＳＨ_２Ｏ腐蚀，在ＨＣｌ－Ｈ_２Ｓ－Ｈ_２Ｏ腐蚀中硫是腐蚀的主要原因；缓蚀剂ＨＳ１１的最佳质量分数为２００μｇ／ｇ，此时缓蚀率可达７４．３１％；缓蚀剂ＨＳ１１与高温缓蚀剂的复配效果优于与ＪＣＣＲ１１３８的复配效果，在缓蚀剂ＨＳ１１与高温缓蚀剂的质量分数分别为２００μｇ／ｇ时，缓蚀率达８９．８４％。

关键词: 腐蚀 , 　２０钢 , 　咪唑啉 , 　缓蚀剂 , 　缓蚀率