Experimental and Quantum Studies on Adsorption and Corrosion Inhibition Effect on Mild Steel in Hydrochloric Acid by Thiophene Derivatives

The inhibition effect of synthesized diethyl 3,4-bis(4-methoxybenzylideneamino) thieno[2,3-b]thiophene-2,5-dicarboxylate(Inh I) and diethyl 3,4-bis(benzylideneamino) thieno[2,3-b]thiophene-2,5-dicarboxylate(Inh Ⅱ),on corrosion of mild steel in 15%HC1 solution was investigated using weight loss measurements,electrochemical polarization,and electrochemical impedance spectroscopy techniques.The experimental results show that the inhibition efficiency of studied inhibitors increased with the increase of inhibitors concentration but decreased with the increase of temperature.Corrosion inhibition efficiencies of 94.5%and 92.1%were obtained with 250 ppm of Inh I and Inh Ⅱ at 303 K,respectively.The potentiodynamic polarization measurements indicate that the studied inhibitors act as mixed inhibitor.The thermodynamic parameters of the corrosion and adsorption processes were calculated and evaluated.The adsorption of these inhibitors was found to obey Langmuir adsorption isotherm.Scanning electron microscopy was used to characterize the surface morphology of the mild steel specimens in presence and absence of inhibitors.The mechanism of the inhibition process was discussed in the light of the chemical structure and quantum-chemical calculations of the investigated inhibitors.     

盐酸溶液中烷基咪唑啉对铜的缓蚀行为

采用了电化学阻抗、极化曲线和循环伏安等方法研究了2-十一烷基-N-羧甲基-N-羟乙基咪唑啉(UHCI)在5%HCl溶液中对铜的缓蚀行为。结果表明,UHCI对铜有明显的缓蚀作用,随着缓蚀剂浓度的增加,其缓蚀率增大,但当缓蚀剂质量浓度达到0.15%后,再增加缓蚀剂浓度,缓蚀效率不再提高;该缓蚀剂是一种混合型缓蚀剂,同时抑制了阴极还原和阳极氧化过程。量子化学计算结果表明,缓蚀剂分子主要通过O(14)提供电子与金属原子成键,在金属表面发生化学吸附。     

核桃叶提取物在盐酸介质中对钢的缓蚀性能

核桃（Juglans）叶提取物（JLE）可以作为“绿色”环保的植物缓蚀剂。本工作采用失重法和动电位极化曲线研究了JLE在1mol／LHCI溶液中对冷轧钢的缓蚀作用。结果表明,JLE对冷轧钢具有较好的缓蚀作用,且存钢表面的吸附符合校正的Langmuir吸附等温式,极化曲线表明,JLE为混合抑制型缓蚀剂。     

磷酸三乙酯与稀土铈(Ⅳ)离子在盐酸溶液中对Cu的缓蚀协同效应

采用电化学阻抗和动电位极化曲线研究了磷酸三乙酯(TEP)对Cu在0.5 mol/L盐酸溶液中的缓蚀作用,考察了TEP与稀土Ce4+对Cu在0.5 mol/L盐酸溶液中的协同作用。结果表明,在TEP浓度不变的情况下,随着Ce4+浓度的增加,缓蚀率先增后减,当Ce4+浓度为1.0 mmol/L时,缓蚀效果最好。在Ce4+浓度不变的情况下,随着TEP浓度的增加,缓蚀率逐渐增大。当复配缓蚀剂浓度为1 mmol/LCe4++58.7 mmol/L TEP时,其缓蚀率达到最大,为80.6%。     

Inhibition Effect of Rhodanine for Corrosion of Mild Steel in Hydrochloric Acid Solution

The inhibition effect of Rhodanine on the corrosion performance of mild steel (MS) was studied in 0.5 M HCl solution. For this purpose, potentiodynamic polarization, electrochemical impedance spectroscopy, and long-term corrosion tests including hydrogen evolution and change in open-cirquit potential during immersion time were used. To determine activation energy of corrosion process, potentiodynamic polarization curves were also obtained in a temperature range from 298 to 328 K. The results show that Rhodanine effectively inhibits the MS corrosion in hydrochloric acid solution. __________ From Zashchita Metallov, Vol. 41, No. 6, 2005, pp. 628–632. Original English Text Copyright ? 2005 by Solmaz, Kardas, Yazici, Erbil. The text was submitted by authors in English.     

Inhibition Effect of Binary Mixtures of Metal Salts on Aluminum Corrosion in Hydrochloric Electrolytes

The protection effects of tin, zinc, nickel, iron, and copper chlorides and their binary mixtures with cadmium chloride or thallium nitrate were compared, their effective concentrations being equal. In some cases, the mixtures proved to be better inhibitors than their constituents. Different approaches to the estimation of the mutual effects of the salts in their binary mixtures are discussed.     

茄叶提取液在盐酸介质中对碳钢的缓蚀性能

通过动电位极化曲线法、电化学阻抗法、失重法和扫描电镜法研究了茄叶提取液在1mol·L-1 HCl中对碳钢的缓蚀性能和机理。结果表明:茄叶提取液的最佳提取条件为盐酸浓度3.0mol·L-1、温度55.0℃、时间62h;在最佳条件下提取的茄叶提取液缓蚀性能优异,当茄叶提取液质量浓度为1 800mg·L-1时,失重缓蚀率达92%以上;茄叶提取液在碳钢表面的吸附符合Langmuir吸附等温模型,茄叶缓蚀剂可显著抑制碳钢的腐蚀。     

盐酸介质中N,N′-二（二苯基膦基）-1-苯乙胺对碳钢的缓蚀性能研究

目的对N,N'-二(二苯基膦基)-1-苯乙胺(NPM)的合成、结构表征及其在盐酸介质中对碳钢的缓蚀性能进行研究。方法用红外光谱、元素分析和熔点测试等方法对NPM的结构进行表征,采用静态失重法、动电位极化曲线法和电化学阻抗法研究NPM在盐酸介质中对碳钢的缓蚀作用,研究腐蚀体系温度、HCl浓度、NPM浓度和腐蚀体系静置时间对NPM缓蚀率的影响,探讨NPM在碳钢表面上的吸附机理。结果动电位极化曲线法研究结果表明NPM是一种混合型缓蚀剂。NPM的缓蚀率随NPM浓度的增加而增大,当NPM的质量浓度为140 mg/L时,NPM在25℃的1.0 mol/L HCl溶液中的缓蚀率达到94.71%;NPM的缓蚀率随腐蚀体系温度的升高而降低,随HCl浓度的增大而减小,但随腐蚀体系静置时间的延长缓蚀率逐渐增大。NPM在碳钢表面的吸附符合Langmuir吸附等温方程式,属于自发进行的物理和化学吸附。结论所合成的化合物NPM是一种高效的混合型有机缓蚀剂。     

盐酸溶液中六次甲基四胺对黄铜的缓蚀作用及吸附热力学研究

采用失重法研究了不同温度下不同浓度的六次甲基四胺在10%盐酸介质中对黄铜的缓蚀作用.结果表明,六次甲基四胺在10%盐酸介质中对黄铜的腐蚀有良好的抑制作用,六次甲基四胺吸附于黄铜表面,其吸附规律服从Langmuir等温式,由此获得了相关热力学参数.     

Electrochemical and Theoretical Investigation for the Protection of Aluminum Corrosion in Hydrochloric Acid using Some Azole Derivatives

Protection of Metals and Physical Chemistry of Surfaces - Three compounds of azole derivatives were investigated as inhibitors for the dissolution of aluminum (Al) in 0.5 M HCl solution using...     

Theoretical and Experimental Study of the Acid Corrosion Inhibition of Copper by Aspirin (Acetylsalicylic Acid)

Protection of Metals and Physical Chemistry of Surfaces - The inhibition efficiency of aspirin (acetylsalicylic acid-ASA) against copper corrosion was investigated in 0.5 M HCl solution at room...     

含氮有机物在盐酸溶液中对锌的缓蚀作用

采用失重法研究了在0．8mol／dm^3盐酸中,盐酸吖啶和溴代十六烷基吡啶对锌的缓蚀作用,求得相关吸附热力学参数。结果表明二者均对锌表现出较强的缓蚀作用,盐酸吖啶在锌表面的吸附属于放热反应,而溴代十六烷基吡啶在锌表面的吸附属于吸热反应。     

白酒糟提取物对Q235钢在盐酸介质中的缓蚀作用和吸附行为

采用失重法和电化学法研究了白酒糟提取物作为酸洗缓蚀剂对Q235钢在盐酸介质中的缓蚀作用和吸附行为。失重法研究表明,白酒糟提取物在盐酸介质中能有效抑制Q235钢的腐蚀,25℃,1mol／L的HCl中,白酒糟提取物浓度为24g／L时,缓蚀率达到94．41％;电化学研究结果表明,白酒糟提取物在1mol／I,HCI中属抑制阳极...     

Corrosion Inhibition of Mild Steel in Hydrochloric and Nitric Acid Solutions Using Willow Leaf Extract

Protection of Metals and Physical Chemistry of Surfaces - The inhibition mechanism of willow (Salix) plant leaf extract on the corrosion of mild steel in 0.5 M HCl and 0.5 M HNO3 solutions...     

纯铝在盐酸中腐蚀动力学研究

用失重法研究了纯铝在不同浓度盐酸介质中不同温度下的腐蚀规律,从而获得了酸度参数、速率常数、反应活化能和指前因子等重要动力学参数。     

Understanding the Corrosion Inhibition Mechanism of Mild Steel in Hydrochloric Acid by a Triazole Derivative: A Combined Experimental and Theoretical Approach

Protection of Metals and Physical Chemistry of Surfaces - The effect of an heterocycle triazole, namely (1-(4-methoxyphenyl)-1H-1,2,3-triazol-4-yl)methanol (MTM) on the corrosion of mild steel in...     

猪殃殃草提取物在盐酸中对Q235钢的缓蚀作用研究

目的开发盐酸清洗领域的天然绿色缓蚀剂。方法通过95%乙醇浸提法从猪殃殃草茎叶中提取植物缓蚀剂,用红外光谱(FTIR)表征了其主要官能团,采用失重法、极化曲线和电化学阻抗(EIS)谱研究了其在1 mol/L盐酸介质中对Q235钢的缓蚀性能,并探讨了缓蚀机理。结果猪殃殃草提取物可明显减缓Q235钢在1 mol/L盐酸介质中的腐蚀,属阴极控制为主的混合型缓蚀剂,缓蚀效率随其浓度的增加而增大,当其质量浓度达到1.2 g/L时,25℃下的缓蚀效率可达82%以上,受浸泡时间的影响不大。其缓蚀机理为"几何覆盖效应",有效缓蚀成分在Q235钢表面的吸附符合Langmuir等温式,吸附平衡常数为10.62 L/g,且属于物理吸附。结论在1 mol/L盐酸溶液介质中,猪殃殃草提取物对Q235钢的缓蚀作用明显,是一种在盐酸清洗领域有一定应用价值的环境友好型缓蚀剂。     

新型希夫碱酸化缓蚀剂在不同温度盐酸介质中对N80钢的缓蚀性能

制备了一种新型希夫碱缓蚀剂1-苯基-3-(1-环己胺)-1-丙烯(PCP),通过失重法、动电位极化扫描、电化学阻抗和扫描电镜等方法,研究了其在不同温度下对油套管钢N80钢的缓蚀性能。结果表明,该酸化缓蚀剂对N80钢在盐酸溶液中具有很好的缓蚀性能,属于混合型缓蚀剂,温度对其缓蚀效率的影响较小。