Feng Liwei, Yin Chengxian, Zhang Huali, Li Yufei, Song Xuehua, Chen Qibin, Liu Honglai
State Key Laboratory of Chemical Engineering, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.
State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an, Shanxi 710065, P. R. China.
ACS Omega. 2018 Dec 31;3(12):18990-18999. doi: 10.1021/acsomega.8b03043.
In this work, cationic Gemini surfactants with different alkyl chain lengths ( = 8, 10, and 12) and a bipyridyl spacer were synthesized and tested as corrosion inhibitors for carbon steel in 1 M HCl solution. The corrosion inhibition efficiency was determined by weight loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy. Results showed that such three inhibitors could effectively inhibit the corrosion of carbon steel in 1 M HCl solution, especially at their low concentrations, while the carbon chain length of Geminis used played a negligible role in the inhibition efficiency. Scanning electron microscopy/energy dispersive X-ray analysis observations demonstrated the formation of a protective inhibitor layer on the carbon steel surface. Additionally, the adsorption of the inhibitor molecules on the carbon steel surface was found to obey the Langmuir isotherm.
在本工作中，合成了具有不同烷基链长度（= 8、10和12）且带有联吡啶间隔基的阳离子 Gemini 表面活性剂，并测试了它们作为碳钢在1 M HCl 溶液中的缓蚀剂的性能。通过失重测量、动电位极化和电化学阻抗谱来测定缓蚀效率。结果表明，这三种缓蚀剂能够有效抑制碳钢在1 M HCl 溶液中的腐蚀，尤其是在低浓度时，而所用 Gemini 表面活性剂的碳链长度对缓蚀效率的影响可忽略不计。扫描电子显微镜/能量色散X射线分析观察结果表明在碳钢表面形成了一层保护性的缓蚀剂膜。此外，发现缓蚀剂分子在碳钢表面的吸附服从朗缪尔等温线。
