高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (5): 1018.doi: 10.7503/cjcu20170557

• 物理化学 • 上一篇    下一篇

3-丁基-5,5-二甲基海因咪唑季铵盐对HCl溶液中Q235钢的缓蚀性能

郭睿, 李云鹏, 土瑞香, 宋博, 郭煜   

  1. 陕西科技大学陕西省轻化工助剂重点实验室, 西安 710021
  • 收稿日期:2017-08-14 出版日期:2018-04-22 发布日期:2018-04-22
  • 作者简介:

    联系人简介: 郭 睿, 男, 教授, 主要从事精细化学品及工业助剂合成与开发研究. E-mail: 365726475@qq.com

  • 基金资助:
    陕西省教育厅服务地方专项计划项目(批准号: 15JF011)和陕西省工业科技攻关项目(批准号: 2016GY-146)资助.

Corrosion Inhibition of 3-Butyl-5,5-dimethyhydantoin Imidazole Ammonium Salt on Q235 Steel in HCl Solution

GUO Rui*, LI Yunpeng, TU Ruixiang, SONG Bo, GUO Yu   

  1. Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an 710021, China
  • Received:2017-08-14 Online:2018-04-22 Published:2018-04-22
  • Contact: GUO Rui

摘要:

利用失重法、 电化学阻抗谱法、 环境扫描电镜观测和接触角测试等研究了3-丁基-5,5-二甲基海因咪唑季铵盐(BDMHI)对HCl溶液中Q235钢的缓蚀性能和其在Q235钢表面的吸附行为. 结果显示, 缓蚀效率随BDMHI浓度的增加而增加, 随温度的升高而降低, 最高缓蚀效率为91.62%; 在25~35 ℃温度范围内, BDMHI质量浓度为1.0 g/L时, 缓蚀效率达80%以上. 测定了BDMHI在Q235钢表面吸附的吸附吉布斯自由能(ΔGads0)和吸附热(ΔHads0). 结果表明, BDMHI在Q235钢表面的吸附为放热反应, 符合Langmuir等温式, 是包含物理吸附和化学吸附的混合吸附. 运用量子化学方法探究了BDMHI的缓蚀机理.

关键词: 咪唑季铵盐, 缓蚀性能, 吸附, 量子化学

Abstract:

The corrosion inhibition performance and adsorption behavior of 3-butyl-5,5-dimethyhydantoin imidazole ammonium(BDMHI) for Q235 steel in HCl solution was investigated by mass loss method, polarization curve, electrochemical impedance spectroscopy(EIS), scanning electron microscopy(SEM), and contact angle measurements. The results show that inhibition efficiency increases with the increase of mass concentration of BDMHI and decreases with the increase of temperature; the highest inhibition efficiency is 91.62%; inhibition efficiency is above 80% at a BDMHI mass concentration of 1.0 g/L in the temperature range of 25—35 ℃. The adsorption properties of BDMHI were estimated using the standard adsorption Gibbs free energy change(ΔGads0) and enthalpy change (ΔHads0), respectively. The results reveal that the adsorption processes are exothermal and belong to a mix-type adsorption with physical adsorption and chemical adsorption, following Langmuir adsorption isotherm. The relationship between the molecular structure of BDMHI and the inhibition efficiency was investigated using quantum chemical calculations.

Key words: Imidazole ammonium salt, Corrosion inhibition, Adsorption, Quantum chemistry

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