番泻叶提取物制备及其阻垢缓蚀性能与作用机制研究

Preparation and Study of Folium Sennae extract and scale-corrosion inhibition mechanism

通过乙醇水溶液回流法制备了番泻叶( Folium Sennae )提取物(FSE),并用红外光谱对其进行了表征,采用静态阻垢、失重、电化学、扫描电镜及量子化学计算等方法分析了FSE的阻垢缓蚀性能及作用机制。实验表明,FSE对CaCO_(3)、CaSO_(4)、Ca_(3)(PO_(4))_(2)的阻垢效率均能达到90%以上;FSE的浓度为600 mg·L^(-1) 时,对碳钢在1 mol·L^(-1) HCl溶液中的缓蚀效率可达87%;通过扫描电镜观察到加入FSE后,碳钢表面的腐蚀得到了明显的改善;电化学和量子化学计算研究表明,FSE对阳极和阴极均有抑制作用,是一种混合型缓蚀剂;其缓蚀机制是化合物分子以物理和化学混合吸附的方式在碳钢表面形成保护层阻止介质侵蚀,且吸附遵循Langmuir吸附等温模型。

Folium sennae extract(FSE)was prepared by reflux extraction method with ethanol aqueous solution and characterized by infrared spectroscopy(FTIR). The scale and corrosion inhibition effect and mechanism of FSE were investigated by static scale inhibition,weight-loss,electrochemical,scanning electron microscope and quantum chemical calculation method.The experiments results show that the scale inhibition efficiency of FSE for CaCO_(3),CaSO_(4) and Ca_(3)(PO_(4))_(2) reached more than 90%;The inhibition efficiency of FSE at 600 mg·L^(-1) in 1 mol·L^(-1) HCl solution reached 87%to mild steel.It was observed by SEM that the corrosion of mild steel surface was significantly improved after added FSE;Electrochemical and quantum chemical calculations studies show that the FSE acted as a mixed-type inhibitor.The inhibition mechanism involved the adsorption by Physical and chemical adsorption of the active ingredients of FSE on the mild steel surface to prevent corrosion.,and the adsorption follows the Langmuir adsorption isothermal model.