Shen Cong, Yan Jing, Ai Zhipeng, Huang Hongbing, Mo Lin, Liang Bangzhi, Zhang ChangHui
Research Institute of Natural Gas Technology, PetroChina Southwest Oil and Gasfield Company, Chengdu, 610213, China.
National Energy R&D Center of High Sulfur Gas Exploitation, Chengdu, 610000, China.
Sci Rep. 2024 Aug 27;14(1):19869. doi: 10.1038/s41598-024-70905-6.
Adding corrosion inhibitors is considered to be a cost-effective way to inhibit metal corrosion. In this study, we report the synthesis of a bi-mannich base corrosion inhibitor (BMT) with an impressive inhibition efficiency on carbon steel in HS and HCl co-existing solution. At the BMT concentration of 9 ppm, the inhibition efficiency (η) of 96.9%, 97.6% and 98.0% were determined by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy, respectively. The adsorption of BMT on the carbon steel surface follows the Langmuir adsorption isotherm, and the calculated free energy indicates that the adsorption is a spontaneous process. This research also delves into understanding the adsorption behavior and corrosion inhibition mechanism of BMT on carbon steel surfaces through quantum chemistry calculations. The results of this study provide guidance for the application of BMT as a corrosion inhibitor in sour and acid environments.
添加缓蚀剂被认为是抑制金属腐蚀的一种经济有效的方法。在本研究中，我们报道了一种双曼尼希碱缓蚀剂（BMT）的合成，该缓蚀剂在HS和HCl共存溶液中对碳钢具有令人印象深刻的缓蚀效率。在BMT浓度为9 ppm时，通过失重法、动电位极化法和电化学阻抗谱分别测定缓蚀效率（η）为96.9%、97.6%和98.0%。BMT在碳钢表面的吸附遵循朗缪尔吸附等温线，计算得到的自由能表明吸附是一个自发过程。本研究还通过量子化学计算深入了解BMT在碳钢表面的吸附行为和缓蚀机理。本研究结果为BMT作为缓蚀剂在酸性和酸性环境中的应用提供了指导。
