摘要
云南甜龙竹竹叶提取物(DBLE)可作为一种环境友好型植物缓蚀剂,用红外光谱(FTIR)表征了DBLE的主要官能团。采用失重法、动电位极化曲线、EIS和SEM研究了DBLE在1 0 mol/L HCl溶液中对冷轧钢的缓蚀作用。结果表明:DBLE具有良好的缓蚀作用,最大缓蚀率达93%,且在钢表面的吸附符合Langmuir吸附等温式。通过Van't Hoff方程和Arrhenius公式分别求出了吸附热△H_(ads)和表观活化能E_a,并据此讨论了缓蚀作用机理。DBLE为混合抑制型缓蚀剂;EIS谱呈半圆容抗弧,电荷转移电阻随缓蚀剂浓度的增加而增大。SEM再次表明DBLF对钢具有好的缓蚀作用。
Dendrocalamus brandisii leaves extract （DBLE） can be used as an environmentally-friendly plant inhibitor. Fourier transform infrared （FTIR） spectroscopy was employed to study the main functional groups of DBLE. The inhibition effect of DBLE on the corrosion of cold rolled steel （CRS） in 1.0 mol/L hydrochloric acid （HCl） solution was studied by weight loss, potcntiodynamic polarization curves, electrochemical impedance spectroscopy （EIS）, and scanning electron microscope （SEM） methods. The results show that DBLE is a good inhibitor, and the maximum inhibition efficiency is up to 93%. The adsorption of DBLE on CRS surface obeys Langmuir adsorption isotherm. The experimental data have been treated with Van＇t Hoff and Arrhenius equations. The adsorption heat △Hads and apparent activation energy Ea are also calculated, and the inhibitive mechanism is discussed in detail according to the parameters. Polarization curves reveal that DBLE behaves as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and charge transfer resistance value increases with the inhibitor concentration. SEM results further confirm the good inhibitive ability of DBLE.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2011年第2期149-154,159,共7页
Journal of Chinese Society For Corrosion and Protection
基金
西南林业大学而上科研基金项日(200818M)和西南林业大学林产化学加工工程校级重点学科建设项目(XKX200907)资助
关键词
云南甜龙竹
提取物
盐酸
钢
缓蚀
吸附
dendrocalamus brandisii, extract, hydrochloric acid, steel, inhibition, adsorption
