2,5-二芳基-1,3,4-噻二唑衍生物的合成及缓蚀性能

合成4种2,5-二芳基-1,3,4-噻二唑化合物,即2,5-二苯基-1,3,4-噻二唑(DPTD),2,5-二(2-羟基苯)-1,3,4-噻二唑(2-DHPTD),2,5-二(3-羟基苯)-1,3,4-噻二唑(3-DHPTD)和2,5-二(4-羟基苯)-1,3,4-噻二唑(4-DHPTD)。通过Tafel极化曲线和电化学阻抗研究4种油溶型噻二唑衍生物在50 mg·L^-1硫-乙醇体系中的缓蚀性能,电化学测试表明:腐蚀液中添加噻二唑衍生物后,银片腐蚀得到抑制;随着缓蚀剂浓度增大,腐蚀电流密度减小,缓蚀效率增大;当缓蚀剂浓度为90 mg·L^-1时,4种缓蚀剂DPTD、2-DHPTD、3-DHPTD和4-DHPTD的缓蚀效率分别为85.8%、94.6%、96.4%和97.1%。采用扫描电子显微镜和原子力显微镜观察其表面形貌,可知缓蚀剂在金属表面形成一层保护膜,阻止腐蚀物质与金属表面的接触,从而抑制银片腐蚀。经分子动力学分析可知,4种噻二唑衍生物吸附于金属表面遵循Langmuir等温方程,且吸附属于以化学吸附为主的混合型吸附。量子化学计算和分子动力学模拟研究表明,4种缓蚀剂均具有很好的缓蚀作用,且4种缓蚀剂的缓蚀效率大小顺序是[4-DHPDT]> [3-DHPDT]> [2-DHPDT]> [DPDT],这与实验结果一致。     

三唑和噻二唑衍生物的合成

本文于固－液相转移催化条件下，以ＰＥＧ－６００为催化剂，从苯并三唑（Ⅰ）合成了１－Ｈ－苯并三唑－１－乙酸乙醋（Ⅱ），Ⅱ与水合肼反应得相应的酰肼（Ⅲ），Ⅲ与苯基异硫氰酸酯作用得１，４－二取代酰氨基硫脲（Ⅳ），Ⅳ在不同条件下环合，分别得１，３，４－噻二唑和１，２，４－三唑。     

含噻二唑膦酸的合成及对铜缓蚀性能研究

用2-氨基噻二唑、醛(或酮)与亚磷酸反应,应用融熔法与溶剂法合成了一系列新的噻二唑膦酸,并用IR、1HNMR、31PNMR等方法对化合物进行了表征。这一系列新的膦酸对铜有较好的缓蚀防腐作用。应用环丁砜作溶剂的方法具有产率高、分离方法简单的优点。     

噻二唑类衍生物的合成及应用进展

介绍了几种典型的噻二唑衍生物的合成方法,并主要从农业及工业等方面阐述了噻二唑类衍生物的应用进展。     

曼尼希碱的结构与其缓蚀性能的关系

利用曼尼希反应制得了曼尼希碱1-苯基-3-二乙氨基-1-丙酮(DPO),再利用DPO和伯胺(苄胺、对甲基苯胺、苯胺)进行胺交换反应,制得了结构不同的曼尼希碱:1-苯基-3-苄氨基-1-丙酮(BPO)、1-苯基-3-对甲苯氨基-1-丙酮(TPO)和1-苯基-3-苯氨基-1-丙酮(PPO)。静态失重法和极化曲线法研究结果表明,其在15%盐酸中90℃时对N80钢的缓蚀性能大小顺序为:DPOBPOTPOPPO。四种曼尼希碱缓蚀剂在N80钢表面上的吸附遵循Langmuir吸附模型,吸附能力大小顺序为:DPOBPOTPOPPO,这说明当曼尼希碱分子中氨基与苯环形成富电子共轭体系时,其吸附能力较强,可表现出较强的缓蚀性能。     

曼尼希碱的结构与其缓蚀性能的关系

利用曼尼希反应制得了曼尼希碱1-苯基-3-二乙氨基-1-丙酮(DPO),再利用DPO和伯胺(苄胺、对甲基苯胺、苯胺)进行胺交换反应,制得了结构不同的曼尼希碱:1-苯基-3-苄氨基-1-丙酮(BPO)、1-苯基-3-对甲苯氨基-1-丙酮(TPO)和1-苯基-3-苯氨基-1-丙酮(PPO)。静态失重法和极化曲线法研究结果表明,其在15%盐酸中90℃时对N80钢的缓蚀性能大小顺序为:DPO相似文献   

聚环氧琥珀酸及其衍生物的缓蚀性能及缓蚀机理

使用静态失重法和腐蚀电化学法研究了聚环氧琥珀酸(PESA)及其硫脲改性的衍生物(CSN-PESA)在自来水环境中对A3碳钢的缓蚀作用,探讨了聚环氧琥珀酸及其衍生物在A3碳钢表面的吸附作用,通过量子化学理论研究了聚环氧琥珀酸及其硫脲改性的衍生物缓蚀机理。研究结果表明:聚环氧琥珀酸及其硫脲改性的衍生物具有一定的缓蚀性能,CSN-PESA的缓蚀率大于PESA;聚环氧琥珀酸及其衍生物在A3碳钢表面产生的缓蚀效果是物理、化学共同吸附的结果,与Langmuir等温式相符合;聚环氧琥珀酸及其衍生物对阴极、阳极有一定的抑制作用。量子化学计算表明:聚环氧琥珀酸衍生物缓蚀率高于聚环氧琥珀酸的主要原因是CSN-PESA分子中的轨道密度主要分布在O、N、S这些杂原子附近。     

噻二唑衍生物润滑油添加剂研究进展

综述了近年来噻二唑衍生物润滑油添加剂的研究进展。主要介绍了含黄原酸结构的噻二唑衍生物添加剂、含二硫键结构的噻二唑衍生物添加剂、硼酸酯(盐)类噻二唑衍生物添加剂、含酰胺结构的噻二唑衍生物添加剂、噻二唑希夫碱添加剂、含酯或醚结构的噻二唑衍生物添加剂等一系列单一噻二唑润滑油添加剂。此外,还介绍了纳米颗粒与噻二唑衍生物的复合润滑油添加剂,该类复合润滑油添加剂能够显著提高润滑油基础油的摩擦性能。提出了制备油酸型噻二唑衍生物润滑油添加剂、噻二唑类离子液体润滑油添加剂及噻二唑纳米微粒润滑油添加剂的展望。     

1,3,4-噻二唑及其衍生物的研究进展

介绍了几种典型的1,3,4-噻二唑的合成方法及2,5位取代基涉及的反应;介绍1,3’4-噻二唑及其衍生物在工业、农业、医药等领域的重要应用。     

BTA及其羧基烷基酯衍生物缓蚀性能的量子化学研究

引言 缓蚀剂的缓蚀效率与其结构有着密切的关系。采用量子化学（QC）计算方法可以得到表征缓蚀剂分子结构的参数，使得从微观层次上探讨其缓蚀作用机理成为可能，并进而为新型缓蚀剂的设计与合成提供有力的理论指导。上世纪七十年代，Vosta和Eliasek首先尝试用量子化学方法研究缓蚀剂性能与量化参数的相关性，随后腐蚀科学工作者进行了大量、深入的研究工作。量化计算已经成为研究缓蚀剂作用机理的有效方法。     

Influence of 2,5-bis(4-dimethylaminophenyl)-1,3,4-thiadiazole on corrosion inhibition of mild steel in acidic media

An example of a new class of corrosion inhibitors, namely, 2,5-bis(4-dimethylaminophenyl)-1,3,4-thiadiazole (DAPT) was synthesized and its inhibiting action on the corrosion of mild steel in 1 M HCl and 0.5 M H₂SO₄ at 30 °C was investigated by various corrosion monitoring techniques. A preliminary screening of the inhibition efficiency was carried out using weight loss measurements. At constant acid concentration, inhibitor efficiency increases with concentration of DAPT and is found to be more efficient in 0.5 M H₂SO₄ than in 1 M HCl. Potentiostatic polarization studies showed that DAPT is a mixed-type inhibitor. The effect of temperature on the corrosion behaviour of mild steel in 1 M HCl with addition of DAPT was studied in the temperature range from 25 to 60 °C. Its was shown that adsorption is consistent with the Langmuir isotherm for 30 °C. The negative free energy of adsorption in the presence of DAPT suggests chemisorption of thiadiazole molecules on the steel surface.     

低磷共聚物对黄铜的缓蚀作用

采用失重法、能量散射X-射线、电化学方法，研究了自制低磷共聚物在配制冷却水中对黄铜的缓蚀作用，分析了空白实验和加入低磷共聚物后黄铜试片的表面元素组成，探讨了低磷共聚物的缓蚀机理。结果表明，低磷共聚物在黄铜试片表面活性位置吸附抑制了阳极电化学过程。     

Corrosion inhibition of carbon steel in hydrochloric acid by furan derivatives

The efficiency of three furan derivatives (2-methylfuran, furfuryl alcohol and furfurylamine), as corrosion inhibitors for carbon steel in 1 M HCl, has been determined by gravimetric and electrochemical measurements. These compounds inhibit corrosion even at very low concentrations, and furfuryl alcohol is the best inhibitor. Polarization curves indicate that all compounds are mixed inhibitors, affecting both cathodic and anodic corrosion currents. Adsorption of furan derivatives on the carbon steel surface is in agreement with the Langmuir adsorption isotherm model, and the calculated Gibbs free energy values confirm the chemical nature of the adsorption. The structural and electronic properties of these inhibitors, obtained using AM1, PM3, MNDO and MINDO/3 semi-empirical self-consistence field methods, are correlated with their experimental efficiencies.     

Corrosion inhibition effect of pyrazole derivatives on mild steel in hydrochloric acid solution

Synthesized compounds, namely methyl 5-(4-Chlorobenzoyloxy)-1-phenyl-1H-pyrazole-3-carboxylate (MCPPC) and 5-(4-methoxyphenyl)-3-(4-methylphenyl)4,5-dihydro-1H-pyrazol-1-yl-(pyridin-4-yl)methanone (MMDPPM) were investigated as corrosion inhibitor for mild steel (MS) in 15% HCl solution using weight loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods. Inhibition efficiency was found concentration-dependent and increased by increasing the concentration of MCPPC and MMDPPM. Both of inhibitors were efficient even at a very low concentration of 25 ppm. The inhibitors MCPPC and MMDPPM showed inhibition efficiency of 67.1 and 76.8%, respectively, at 25 ppm, whereas it was 92.0 and 95.9%, respectively, at 250 ppm concentration at 303 K. The potentiodynamic polarization curves showed that MCPPC and MMDPPM act as mixed-type inhibitor in 15% HCl solution. The Nyquist plots showed that charge transfer resistance increased and double-layer capacitance decreased on increasing the concentration of studied inhibitors due to adsorption of inhibitor molecules on MS surface. The adsorption of each inhibitor on MS surface obeys Langmuir adsorption isotherm. On the basis of thermodynamic adsorption parameters, mixed-type adsorption (physisorption and chemisorption) for the studied inhibitors on MS surface was suggested. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and atomic force microscopy (AFM) analyses confirmed the existence of a protective film of the inhibitor on MS surface. The density functional theory was employed for theoretical calculations, and the obtained results were found to be consistent with the experimental findings.     

土酸溶液中苯扎氯铵对不锈钢的缓蚀作用及吸附热力学研究

为了研究土酸介质中烷基季铵盐类阳离子表面活性剂对不锈钢的缓蚀及吸附作用,采用静态失重法在不同温度的10%土酸溶液中苯扎氯铵对304#不锈钢的缓蚀作用,应用吸附理论和Sek ine方法对静态挂片试验数据进行处理。结果表明,苯扎氯铵在不锈钢表面的定向吸附是产生缓蚀的主要原因,当其含量达到一定浓度后,缓蚀作用基本保持不变;在浓度为0~0.2%时,其在不锈钢表面的吸附服从Langmu ir吸附等温式,相关系数大于0.99;缓蚀率随浓度的增加和温度的升高而增大,是由吸附过程中表现为总熵增加的特点决定的;获得了吸附过程ΔHo、ΔSo和ΔGo等重要热力学参数。     

氨基酸缓蚀剂缓蚀机理分子模拟分析及发展趋势

采用量子化学和分子动力学计算方法可以得到表征缓蚀剂分子结构的一系列结构参数,并通过分析体系的结合能与对关联函数,可从微观上探讨其缓蚀机理,进而为设计及合成新型高效缓蚀剂提供有力的理论指导。并讨论了氨基酸缓蚀剂发展趋势。     

Corrosion and corrosion inhibition of nickel in HClO4 solutions using the EQCM technique

Application of the electrochemical quartz crystal microbalance (EQCM) to the study of metal corrosion and its inhibition is rather recent. Among the advantages of this technique are its very high sensitivity and the possibility of simultaneous mass variations and voltammogram recording. These characteristics suggest the use of the EQCM for research in very low corrosion rate conditions. This paper reports the results of EQCM measurements on the corrosion inhibition rates of Ni in 0.1m HClO4, in the absence and presence of different inhibitors in free corrosion conditions, for following inhibitors: acridine (A), benzyl quinolinium chloride (BQCl), dodecyl quinolinium bromide (DDQBr), tributylbenzyl ammonium iodide (TBNI) and potassium iodide (KI). The corrosion rate was reduced considerably by KI and TBNI. DDQBr showed a good inhibitive efficiency, while BQCl had only a small effect, and A stimulated corrosion of the Ni. Voltammograms at different scanning rates and the mass variation in the same solutions were recorded. Comparison of the current density and the mass changes provided the basis for a qualitative interpretation of the passivation of Ni and the mechanism of action of the different inhibitors.     

Corrosion and corrosion inhibition of nickel in HClO4 solutions using the EQCM technique

Application of the electrochemical quartz crystal microbalance (EQCM) to the study of metal corrosion and its inhibition is rather recent. Among the advantages of this technique are its very high sensitivity and the possibility of simultaneous mass variations and voltammogram recording. These characteristics suggest the use of the EQCM for research in very low corrosion rate conditions. This paper reports the results of EQCM measurements on the corrosion inhibition rates of Ni in 0.1m HClO4, in the absence and presence of different inhibitors in free corrosion conditions, for following inhibitors: acridine (A), benzyl quinolinium chloride (BQCl), dodecyl quinolinium bromide (DDQBr), tributylbenzyl ammonium iodide (TBNI) and potassium iodide (KI). The corrosion rate was reduced considerably by KI and TBNI. DDQBr showed a good inhibitive efficiency, while BQCl had only a small effect, and A stimulated corrosion of the Ni. Voltammograms at different scanning rates and the mass variation in the same solutions were recorded. Comparison of the current density and the mass changes provided the basis for a qualitative interpretation of the passivation of Ni and the mechanism of action of the different inhibitors.