石油炼制与化工 ›› 2018, Vol. 49 ›› Issue (12): 97-102.

• 设备及防腐 • 上一篇    

曼尼希碱型缓蚀剂的合成及缓蚀作用的评价

郭文姝1,2,丛玉凤1,黄玮1,程丽华2,张梓铭2   

  1. 1.辽宁石油化工大学 化学化工与环境学部
    2.
    广东石油化工学院化学工程学院
  • 收稿日期:2018-03-14 修回日期:2018-05-03 出版日期:2018-12-12 发布日期:2019-01-03
  • 通讯作者: 郭文姝 E-mail:1906475360@qq.com
  • 基金资助:
    国家自然科学青年基金项目;广东省公益研究与能力建设项目;茂名市科技计划项目

SYNTHESIS OF MANNICH BASE INHIBITOR AND THEIR EFFECTIVENESS AGAINST CORROSION

    

  1.  
  • Received:2018-03-14 Revised:2018-05-03 Online:2018-12-12 Published:2019-01-03
  • Supported by:
     

摘要: 以油酸、三乙烯四胺为原料通过酰胺化、环化反应合成咪唑啉衍生物(IMTT);IMTT与甲醛、丙酮发生曼尼希反应制备出曼尼希碱型缓蚀剂(IMTTM)。利用红外光谱进行产物结构表征,并用动态失重法、极化曲线法、交流阻抗技术和SEM-EDS研究在HCl溶液中对10号钢的缓蚀作用。结果表明:在60 ℃时,IMTT和IMTTM对10号钢的缓蚀率分别达到96.11%和97.75%,而IMTTM缓蚀效果更为显著;极化曲线表明IMTT和IMTTM均属于抑制阳极为主的混合型缓蚀剂;电化学阻抗测试与极化曲线和失重法得到的结论一致;SEM-EDS研究得出腐蚀产物主要为Fe,Cr,Mn的不同价态氧化物, IMTTM所形成的腐蚀产物较为致密,具有更佳的抗腐蚀性能;通过模拟等温曲线发现, IMTT和IMTTM均符合Langmuir等温吸附规律。

关键词: 曼尼希, 缓蚀剂, 等温吸附

Abstract: In this paper, imidazoline (IMTT) was synthesized through amidation and cyclization reactions by using oleic acid, triethylene tetramine as raw material. IMTT, which is reacted with formaldehyde and acetone, is used to prepare mannich base inhibitor (IMTTM). The structure of product was identified by IR. By using dynamic weight loss method, polarization curve method, AC impedance technique (EIS) and SEM-EDS, the corrosion inhibition of number 10 steel in HCl aqueous solution was studied. The results showed that at 60 ℃, the corrosion inhibition rate of IMTT and IMTTM is 96.11% and 97.75%%, respectively, and the effect of IMTTM is more significant. Polarization curve indicated that both IMTT and IMTTM are a mixed corrosion inhibitor of anode. The EIS test results are basically as same as the ones of polarization curve and weight loss method. SEM-EDS study demonstrated that the corrosion products are mainly different valence oxides of Fe, Cr and Mn. In addition, the corrosion product formed by IMTTM is denser, resulting in better corrosion resistance. It is found through simulated isotherm curves that both inhibitor IMTT and IMTTM follow Langmuir isotherm adsorption.

Key words: Mannich, corrosion inhibitor, isothermal adsorption

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