咪唑类药物缓蚀剂缓蚀性能的研究

发布时间：2018-02-22 03:11

  本文关键词： 咪唑类 缓蚀剂 失重法 极化曲线法 量子化学计算　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：金属腐蚀给我们的社会经济带了巨大的损失。在使用缓蚀剂来对金属进行防腐蚀处理的过程中无需使用到各种大型设备,也不会对金属材料的性质产生影响,同时相较于其他防腐蚀手段使用缓蚀剂的成本也更低。目前使用的缓蚀剂以有机缓蚀剂为主,这些有机化合物中含有未经配对的杂原子(N、O、S、P)以及大π键,这样有利于缓蚀剂分子与碳钢表面的空的d轨道进行相互作用,进而形成保护膜层以达到防腐蚀的目的。当前,因药物分子中含有大量杂原子而受到研究人员的广泛关注,同时利用废弃药物原料作为缓蚀剂有利于环境保护以及最大化利用资源。本文中我们选用了四种咪唑类药物作为研究对象,它们分别是氟苯咪唑、甲苯咪唑、噻苯咪唑以及阿苯咪唑,选用1MHNO_3为腐蚀介质,低碳钢为腐蚀金属,通过失重法实验、极化曲线法以及量子化学计算法的途径来研究这四种药物作为缓蚀剂时的缓蚀效率,吸附机理以及相应的缓蚀机理。失重法实验结果表明,在1MHNO_3腐蚀介质中,这四种药物分子均对低碳钢有很好的缓蚀性能,缓蚀效率随着温度升高而降低,随着缓蚀剂浓度的增加而上升。在腐蚀介质温度为25℃和缓蚀剂浓度为5 mM时,它们的缓蚀效率均可达到最大值,最大值分别为96.1%,92%,90.2%,87.5%,其中氟苯咪唑的缓蚀效率最佳。同时,四种缓蚀剂分子的吸附均服从langmuir吸附等温式,且它们的吸附以物理吸附为主。极化曲线结果表明这四种缓蚀剂属于混合型缓蚀剂,且分析电化学参数可知氟苯咪唑的缓蚀性能最佳。分析量子化学参数和Fukui指数可知氟苯咪唑的缓蚀性能最佳,同时氟苯咪唑有最多的活性位点。
[Abstract]:Metal corrosion takes a huge toll on our society and economy. The use of corrosion inhibitors for anticorrosive treatment of metals does not require the use of large equipment, nor does it affect the properties of metal materials. At the same time, the cost of using the inhibitor is also lower than that of other anticorrosion methods. The inhibitors currently in use are mainly organic corrosion inhibitors, which contain unpaired heteroatoms (NOOOOSN) and large 蟺 bonds. This is conducive to the interaction of inhibitor molecules with the empty d-orbitals on carbon steel surfaces, thus forming a protective film layer for corrosion prevention. At present, researchers are widely concerned about the presence of a large number of heteronuclear atoms in drug molecules. At the same time, the use of waste drug as corrosion inhibitor is beneficial to environmental protection and maximize the use of resources. In this paper, we selected four kinds of imidazole as the research object, they are flumimidazole and mebendazole, respectively. Thiabenimidazole and albendazole, 1 MHNO3 as corrosion medium and low carbon steel as corrosion metal, were used to study the corrosion inhibition efficiency of these four drugs as corrosion inhibitor by weightlessness test, polarization curve method and quantum chemical calculation method. The adsorption mechanism and the corresponding corrosion inhibition mechanism. The results of weightlessness test show that in 1MHNO3 corrosion medium, the four kinds of drug molecules have good corrosion inhibition performance on low carbon steel, and the corrosion inhibition efficiency decreases with the increase of temperature. With the increase of the concentration of corrosion inhibitor, the corrosion inhibition efficiency can reach the maximum at 25 鈩，

本文编号：1523501