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合成了一种新的席夫碱缓蚀剂3,5-二溴水杨醛-2-噻吩甲酰肼(L2),通过Tefel极化曲线、电化学阻抗、扫描电镜和分子动力学模拟方法研究了该缓蚀剂在模拟油田水中对碳钢的缓蚀效果,并探讨了其缓蚀机理和吸附行为。结果表明,L2在不同温度、H2S浓度、pH值和Cl-浓度条件下的模拟油田水中对碳钢均具有良好的缓蚀性能。分子动力学模拟结果表明,在水溶液中缓蚀剂L2分子可以稳定地平行吸附在金属表面,有效地将金属表面和水分子隔开,从而起到缓蚀作用,吸附方式为多位点化学吸附;同时L2形成的分子吸附膜可有效地抑制腐蚀离子(Cl-和H3O+)在吸附膜中的扩散,避免了金属表面与腐蚀介质接触而发生腐蚀,从而表现出良好的缓蚀性能。
A new Schiff base corrosion inhibitor 3,5-dibromosalicylaldehyde-2-thiophenecarboxyl hydrazide (L2) was synthesized and characterized by Tefel polarization curve, electrochemical impedance spectroscopy, scanning electron microscopy and molecular dynamics simulation The corrosion inhibition effect of this corrosion inhibitor on carbon steel in simulated oilfield water was studied. The corrosion inhibition mechanism and adsorption behavior were also discussed. The results show that L2 has good corrosion inhibition performance on carbon steel in simulated oilfields under different temperature, H2S concentration, pH value and Cl-concentration. The results of molecular dynamics simulation show that the L2 molecules of corrosion inhibitors in aqueous solution can stably and parallelly adsorb on the metal surface, effectively separating the metal surface from the water molecules, thereby acting as a corrosion inhibitor. The adsorption mode is multi-site chemisorption ; At the same time, the molecular adsorption film formed by L2 can effectively inhibit the diffusion of the corrosive ions (Cl- and H3O +) in the adsorption film, and prevent the corrosion of the metal surface in contact with the corrosive medium, thereby exhibiting good corrosion inhibition performance.