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合成了一种新型缓蚀剂O,O’-二(2-苯乙基)二硫代磷酸二乙铵(EPP),并用元素分析和红外光谱对其进行了表征。采用静态失重法、极化曲线法和电化学阻抗法研究了EPP在HCl溶液中对Q235钢的缓蚀性能,探讨了其在Q235钢表面的吸附行为,考察了HCl浓度、腐蚀体系温度等因素对其缓蚀率的影响。结果表明:EPP是一种高效的混合型缓蚀剂,其缓蚀率随缓蚀剂浓度增加而增大,随腐蚀系统温度升高而缓慢减小。在30℃,1.0 mol·L-1的HCl溶液中,EPP浓度为60 mg·L-1时,其缓蚀率高达98.48%。EPP在Q235钢表面的吸附符合Langmuir吸附等温式,属于自发进行的化学吸附。量子化学计算结果表明,EPP通过配位键和反馈键与金属Fe形成了多中心、稳定的化学吸附。
A new type of corrosion inhibitor O, O’-bis (2-phenylethyl) phosphorodithioate (EPP) was synthesized and characterized by elemental analysis and infrared spectroscopy. The corrosion inhibition performance of EPP on Q235 steel in HCl solution was studied by static weight loss method, polarization curve method and electrochemical impedance method. The adsorption behavior of EPP on Q235 steel surface was discussed. The effects of HCl concentration, temperature of corrosion system and other factors The impact of its inhibition rate. The results show that EPP is a highly effective mixed corrosion inhibitor. The corrosion inhibition rate increases with the concentration of corrosion inhibitor and decreases slowly with the increase of corrosion temperature. When the concentration of EPP was 60 mg · L-1, the corrosion inhibition rate was as high as 98.48% in 1.0 mol·L-1 HCl solution at 30 ℃. The adsorption of EPP on Q235 steel surface is in accordance with the Langmuir adsorption isotherm and belongs to spontaneous chemisorption. Quantum chemical calculations show that EPP forms a multi-center, stable chemisorption with metal Fe via coordination bonds and feedback bonds.