【作者】 马玉聪； 樊保民； 郝华； 吕金玉； 贺瑶； 杨彪；

【Author】 MA Yucong;FAN Baomin;HAO Hua;L Jinyu;HE Yao;YANG Biao;School of Materials and Mechanical Engineering,Beijing Technology and Business University;Institute of Chemistry,Chinese Academy of Sciences;

【机构】 北京工商大学材料与机械工程学院； 中国科学院化学研究所；

【摘要】 采用反相溶剂萃取法制备以β-环糊精为主体（β-CyD）,肉桂醛（CA）为客体的超分子缓蚀剂CDCA;最佳制备条件为40℃下反应30 h。相溶解度曲线显示β-CD与CA按摩尔比1:1进行自组装。傅里叶变化红外光谱表明主、客体间通过氢键相互缔合。动态失重实验结果显示,CDCA可有效减缓Q235A碳钢在0.5 mol·L^-1盐酸中的腐蚀,30℃添加12 mmol·L^-1时,缓蚀率高达93.8%。开路电位与动电位扫描极化曲线表明,CDCA可同时抑制腐蚀反应的阴、阳极过程,属于阳极抑制为主的混合型缓蚀剂。电化学阻抗谱分析说明添加CDCA可增大腐蚀反应的电荷转移阻抗,进而减缓腐蚀。紫外-可见光谱分析显示,CDCA也可与溶液中的Fe²⁺或Fe³⁺发生络合作用,从而抑制它们对电化学腐蚀的促进作用。X-射线光电子能谱分析结果显示,经CDCA处理后的碳钢试样表面未检测出主体β-CyD的价键信息,结合表面浸润性的结果可以说明,CA借助β-CyD实现在水中的溶解分散,并在金属/溶液界面被释放,自组装形成保护膜。理论计算结果表明,CA分子以平行取向吸附于金属表面。更多还原

【Abstract】 A supramolecular complex（CDCA） was prepared based on β-cyclodextrin（β-CyD,host） and transcinnamaldehyde（CA,guest） through organic solvent extraction.The optimal preparation process was detemined for30 h reaction under 40 ℃.Phase solubility studies indicated a stoichiometric ratio of 1:1 for host:guest in the structure of CDCA.Hydrogen bonding interaction was revealed between host and guest molecules by the results of Fourier transform infrared spectra.The result of dynamic weight loss measurement showed that the corrosion of Q235A mild steel could be effectively retarded by the addition of CDCA in 0.5 M HCl;the inhibition efficiency for mild steel in HCl solution could reach 93.8%in the presence of 12 mM CDCA.The variation of open circuit potential and the analyses of potentiodynamic polarization curves indicated that both the cathodic and anodic process could be depressed in the presence of CDCA,which was categorized as the mix-type inhibitior.The results of electrochemical impedance spectroscopy showed that the charge transfer resistance could be enhanced as the concentration of CDCA increased.In addition,Fe²⁺ and Fe³⁺ species could be complexed by CDCA via analyzing the UV-vis spectra,which was prone to inhibition the corrosion accelerating effect caused by the oxides of iron.According to deconvolution results of X-ray photoelecgon spectroscopy and interfacial infiltration,little chemical information of host compound（β-CyD） was detected disclosing the sole component of guest molecules in the protective layer on steel surface.Therefore,the guest molecules（CA） could dissolve in water with the aid of host compound（β-CyD） and assemble on the steel surface.The yielding of theoretical calculations was in good agreement with experimental conclusions.更多还原