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用不同浓度的C2H5OH(体积分数:20%-80%)从金竹竹叶中提取制备出竹叶缓蚀剂(简称为PSLE),用紫外-可见(UV-Vis)光谱和傅里叶变换红外(FTIR)光谱对其进行了表征,并对总黄酮含量进行了测定.采用失重法、动电位极化曲线、电化学阻抗谱(EIS)和扫描电子显微镜(SEM)研究PSLE在HCl介质中对铝的缓蚀作用.采用量子化学密度泛函理论(DFT)研究了两个主要竹叶黄酮成分牡荆苷和异牡荆苷的吸附方式.结果表明:PSLE对铝具有良好的缓蚀作用,且在铝表面的吸附符合Langmuir吸附等温式.缓蚀率随其浓度的增加而增大,但随温度的升高和盐酸浓度的增加而降低.竹叶总黄酮含量和竹叶缓蚀剂的缓蚀性能有良好的相关性,初步推测竹叶缓蚀剂的有效成分主要为竹叶黄酮类化合物.PSLE为阴极抑制型缓蚀剂;EIS在高频区呈容抗弧,在低频区呈感抗弧,添加PSLE后,阻抗值显著增大.SEM表明添加PSLE对铝的腐蚀产生了明显的抑制作用.量子化学计算结果表明,牡荆苷和异牡荆苷的吸附中心主要集中在竹叶黄酮骨架(FBS).
Bamboo leaf inhibitor (abbreviated as PSLE) was prepared from bamboo leaves with different concentrations of C2H5OH (volume fraction: 20% -80%), (FTIR) spectroscopy, and the content of total flavonoids was measured.The weight loss, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) The corrosion inhibition of aluminum was investigated by means of quantum chemical density functional theory (DFT). The adsorption of vitexin and isovitexin from two main bamboo leaves was studied. The results showed that PSLE had a good corrosion inhibition effect on aluminum, And the adsorption on the aluminum surface accords with the Langmuir adsorption isotherm.The inhibition rate increases with the increase of its concentration but decreases with the increase of temperature and the concentration of hydrochloric acid.The content of total flavonoids in bamboo leaves and the content of bamboo leaf inhibitor Corrosion inhibition performance has a good correlation, presumed that the main components of the bamboo leaf inhibitor is the bamboo leaf flavonoids .PSLE cathodic suppression inhibitor; EIS arc resistance in the high frequency region, in the low frequency region was Inductance arc, after adding PSLE, the impedance value increased significantly.SEM shows that the addition of PSLE aluminum rot Etc .. Quantum chemical calculation results show that the adsorption centers of vitexin and isovitexin are mainly concentrated on the bamboo leaf flavone skeleton (FBS).