防己和延胡索提取物对J55钢的缓蚀作用研究
发布时间：2019-06-12 03:00
【摘要】：本文利用防己和延胡索两种富含生物碱的中草药作为提取缓蚀剂的原料,使用有机溶剂回流提取法制备得到实验所用缓蚀剂。采用傅里叶变换红外光谱、电化学阻抗谱、动电位极化曲线、失重实验、接触角测试、紫外可见光谱、扫描电子显微镜、扫描电化学显微镜和能谱仪等研究了两种提取物对J55钢在3.5%NaCl饱和C02溶液中的腐蚀、吸附行为和添加缓蚀剂前后J55钢表面腐蚀形貌。实验结果显示:防己和延胡索提取物对J55钢的腐蚀都具有较好的抑制效果,当加入4%体积比的提取物缓蚀剂时,通过阻抗测试得到的缓蚀效率分别为92.14%和87.15%;两种缓蚀剂都属于以抑制阳极反应为主的混合型缓蚀剂,二者在J55钢表面上的吸附行为均符合Langmuir等温吸附模型;防己和延胡索缓蚀剂在金属表面吸附是一个在热力学上自发、放热的过程。防己和延胡索提取物中都含有C=O、N-H、O-H、C-O、C-N、苯环等具有缓蚀作用的极性基团,含有这些基团的有机物分子能够在J55钢表面吸附形成一层具有保护作用的有机物分子保护膜,减轻腐蚀介质对J55钢的腐蚀。为了进一步探究和验证防己和延胡索提取物中主要起的缓蚀作用的成分,本文通过文献资料调研、极化曲线和红外光谱等测试方法,确定了防己和延胡索提取物中主要起缓蚀剂作用的组分分别为粉防己碱和延胡索乙素。随后使用第三章中相同的研究手段,对粉防己碱和延胡索乙素的缓蚀效果进行了详细的研究。电化学实验结果显示:在所研究的六种成分中粉防己碱和延胡索乙素对J55钢具有最好的腐蚀抑制效果,当添加量同为400mg/L时,二者通过电化学阻抗谱计算得到的缓蚀率分别达到90.39%和90.46%,粉防己碱和延胡索乙素的吸附同样遵循Langmuir等温吸附式,属于混合型缓蚀剂;接触角、扫描电化学显微镜与扫描电子显微镜的结果均表明,粉防己碱和延胡索乙素在J55钢表面吸附成膜。采用Gaussian软件对粉防己碱和延胡索乙素分子的量化参数进行计算,结果显示在气相(真空)和液相环境下计算得到计算结果差别不大;两种有机物分子的EHOMO比较接近,供电子能力大致相同;虽然延胡索乙素分子的ELuMo及△E均较小,但与粉防己碱差别不大,表明二者具有近似的腐蚀抑制效果,这与实验的测试结果相吻合。采用分子动力学模拟方法研究了粉防己碱与延胡索乙素分子在Fe(110)面的吸附行为。计算结果显示,二者都倾向于平行吸附在Fe(110)表面,并且延胡索乙素的吸附能略大于粉防己碱,这一结果与量子化学和实验测试取得的结果一致。
[Abstract]:In this paper, two kinds of alkaloid-rich Chinese herbal medicine, Fangji and Corydalis, were used as raw materials to extract corrosion inhibitor, and the corrosion inhibitor was prepared by organic solvent reflux extraction method. The corrosion, adsorption behavior and surface corrosion morphology of J55 steel in 3.5%NaCl saturated CO2 solution were studied by Fourier transform infrared spectroscopy, electrochemical impedance spectroscopy, potentiodynamic polarization curve, weightlessness test, contact angle test, UV-vis spectrum, scanning electron microscope, scanning electrochemical microscope and energy dispersive spectroscopy. The experimental results show that both Fangji and Yanhusuo extract have good inhibition effect on the corrosion of J55 steel. When 4% volume ratio of extract inhibitor is added, the corrosion inhibition efficiency is 92.14% and 87.15%, respectively, and the two inhibitors belong to the mixed corrosion inhibitor which is mainly to inhibit the anodic reaction, and the adsorption behavior of the two inhibitors on the surface of J55 steel accords with Langmuir isotherm adsorption model, and the corrosion inhibition efficiency of the two inhibitors on the surface of J55 steel is 92.14% and 87.15%, respectively, and the adsorption behavior of the two inhibitors on the surface of J55 steel is in accordance with the corrosion isotherm model. The adsorption of corrosion inhibitors on metal surface is a thermodynamic spontaneous and exothermic process. Both the extract of Fangji and Elaeagnus angustifolia contain the polar groups such as C 鈮，
本文编号：2497677
[Abstract]:In this paper, two kinds of alkaloid-rich Chinese herbal medicine, Fangji and Corydalis, were used as raw materials to extract corrosion inhibitor, and the corrosion inhibitor was prepared by organic solvent reflux extraction method. The corrosion, adsorption behavior and surface corrosion morphology of J55 steel in 3.5%NaCl saturated CO2 solution were studied by Fourier transform infrared spectroscopy, electrochemical impedance spectroscopy, potentiodynamic polarization curve, weightlessness test, contact angle test, UV-vis spectrum, scanning electron microscope, scanning electrochemical microscope and energy dispersive spectroscopy. The experimental results show that both Fangji and Yanhusuo extract have good inhibition effect on the corrosion of J55 steel. When 4% volume ratio of extract inhibitor is added, the corrosion inhibition efficiency is 92.14% and 87.15%, respectively, and the two inhibitors belong to the mixed corrosion inhibitor which is mainly to inhibit the anodic reaction, and the adsorption behavior of the two inhibitors on the surface of J55 steel accords with Langmuir isotherm adsorption model, and the corrosion inhibition efficiency of the two inhibitors on the surface of J55 steel is 92.14% and 87.15%, respectively, and the adsorption behavior of the two inhibitors on the surface of J55 steel is in accordance with the corrosion isotherm model. The adsorption of corrosion inhibitors on metal surface is a thermodynamic spontaneous and exothermic process. Both the extract of Fangji and Elaeagnus angustifolia contain the polar groups such as C 鈮，
本文编号：2497677
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