复合缓蚀剂在31%NaCl溶液中的缓蚀性能

利用失重法、极化曲线和交流阻抗技术研究了复配缓蚀剂(硫酸锌,葡萄糖酸钙,多聚磷酸钠)对G105钢在31%氯化钠溶液中的缓蚀行为,分析了其缓蚀机理.结果表明,复配的缓蚀剂是一种混合型的缓蚀剂,在80 ℃时,所复配的缓蚀剂在31%氯化钠溶液中的缓蚀率达到了80%以上.     

低合金钢在添加缓蚀剂的NaCl溶液中的腐蚀行为

研究分别添加少量(1%)缓蚀剂乌洛托品、磷酸钠、硫脲时在3.5%NaCl溶液中对低合金钢的缓蚀作用。运用线性极化技术测定比较上述三种缓蚀剂的缓蚀效果,且用交流阻抗法测得的结果与线性极化的一致。通过Tafel曲线对缓蚀剂的缓蚀机理进行了初步探讨。研究结果表明缓蚀效果:磷酸钠>硫脲>乌洛托品。缓蚀剂的作用是在金属表面成膜,改变了金属表面状态,从而抑制金属的腐蚀。     

低碳钢在富含H2S乙醇胺溶液中的腐蚀及缓蚀剂抑制

利用失重、腐蚀电化学方法和表面分析技术研究了碳钢在富含H2S的乙醇胺(MEA)溶液中的腐蚀行为，以及添加缓蚀剂后对其电化学行为的影响．讨论了IMC—C5缓蚀剂对该体系的缓蚀作用机理．结果表明，脱硫系统中吸收了硫化氢的乙醇胺溶液对碳钢的腐蚀十分严重，IMC—C5缓蚀剂能有效控制碳钢在该体系中的腐蚀．其缓蚀作用主要来自于吸附缓蚀剂分子对腐蚀阳极过程的抑制，为阳极吸附型缓蚀剂．     

铁在含缓蚀剂的盐酸中的阻抗研究

<正> 本文用交流阻抗及极化曲线方法研究了多种吸附型缓蚀剂在1NHCl中对铁的缓蚀作用。结果表明,伯胺类缓蚀剂的缓蚀作用机理是几何覆盖效应,丙炔醇(PA),硫脲及丙烯基硫脲(ATU)的缓蚀作用机理是催化效应;几何覆盖效应缓蚀剂的加入基本     

咪唑啉型缓蚀剂缓蚀机理的理论研究进展

咪唑啉及其衍生物是金属腐蚀缓蚀剂品种之一,相关研究十分活跃．本文从缓蚀剂分子构效关系的量子化学、缓蚀剂-金属界面体系的分子模拟和缓蚀剂分子在不同腐蚀介质中的缓蚀机理等方面的研究结果,综述了国内外有关咪唑啉型缓蚀剂的缓蚀作用机理及相关分子模拟的研究进展情况,探讨了其发展方向．     

金属缓蚀剂Langmuir—Blodgett膜及缓蚀机理的研究

应用Ｌａｎｇｍｕｉｒ－ｂｌｏｄｇｅｔｔ（ＬＢ）技术研究了硬脂酸和十六烷基三甲基溴化胺等金属缓蚀剂在碳钢电极上的取向，单分子膜覆盖层数及分子结构及其缓蚀作用的影响，在实验技术上实现了对缓蚀剂表面膜在分子规模上的控制，文中讨论了这两种缓蚀剂的缓蚀机理。     

关于缓蚀剂研究的电化学方法

讨论了应用稳态极化曲线测量、线性极化电阻测量和交流阻抗测量研究酸溶液中的吸附型缓蚀剂时,可能得到的信息及其在推断缓蚀剂作用机理和测定缓蚀效率方面的应用。     

镁及镁合金缓蚀剂研究现状与展望

缓蚀剂技术是一种简单有效抑制金属在腐蚀介质中遭到破坏的腐蚀防护手段,在钢铁、铜等传统金属上已有大量研究及应用。由于镁具有接受电子和给予电子能力都比较低的原子结构特点和高活泼的化学性质,对传统金属材料有效的缓蚀剂对镁合金作用并不理想,所以对镁合金的缓蚀剂研究较少、起步较晚。近年来,经过国内外研究机构的不懈努力,对镁合金缓蚀剂的开发和缓蚀机理的研究取得了一定突破,初步建立了镁合金缓蚀剂的评价体系。针对镁合金缓蚀剂的不同应用介质,结合镁合金缓蚀剂的化合物性质,阐述了镁合金缓蚀剂的构效关系、影响缓蚀效率的主要因素、复配缓蚀剂配方优化等最新研究动态,并介绍了其缓蚀机理或协同缓蚀机理。最后,结合镁合金缓蚀剂的研究现状以及新的研究方法及其检测技术的发展,对镁合金缓蚀剂未来的研究方向、发展趋势和应用领域的拓展提出了展望。     

二氧化碳腐蚀缓蚀剂及其缓蚀机理的研究进展

首先分别论述了单组分缓蚀剂和复配型缓蚀剂的缓蚀机理,即不同类型的缓蚀剂在金属表面所具有的不同吸附过程。单组分缓蚀剂中特殊的分子基团在金属表面通过物理吸附、化学吸附或混合吸附过程起到缓蚀作用,复配型缓蚀剂在金属表面通过各组分间协同吸附或竞争吸附过程起到缓蚀作用,并指出了缓蚀机理的研究所存在的问题。然后,主要综述了近几年来国内外对用于二氧化碳腐蚀缓蚀剂的研究进展,包括咪唑啉衍生物、表面活性剂、季铵盐、有机胺和复配型缓蚀剂,结合缓蚀剂的分子结构和缓蚀效率等对其进行了阐述。介绍了几种用于二氧化碳腐蚀的新型缓蚀剂,如多活性位点有机化合物、硫醇、席夫碱和聚合物等。最后针对二氧化碳腐蚀环境的复杂性,对未来缓蚀剂及其缓蚀机理的研究方向进行了展望。     

硫脲及其衍生物的缓蚀行为研究进展

从研究方法、缓蚀作用和促进作用、浓度极值现象、 加速渗H作用、吸附类型及作用机理等方面综述了国内外对硫脲及其衍生物缓蚀行为的研究 进展.硫脲及其衍生物作为吸附型酸洗缓蚀剂,材料、介质、温度、缓蚀剂浓度等因素对其 作用行为有较大影响.     

乙醇胺钼酸盐的缓蚀作用与机理

采用腐蚀失重指标，极化曲线，电化学交流阻抗和电离度测定、划伤电极技术和ＸＰＳ等研究了三种乙醇胺钼酸盐在Ａ３钢／去离子水体系中的缓蚀作用与机理。结果发现，三种乙醇胺钼酸盐与均有优良的缓蚀性能，均是以抑制阳极过程为主的混合型缓蚀剂；其缓蚀能力明显优于钼酸钠、对应的乙醇胺及两者的混合物，表明分子内的醇胺基团与钼酸根有明显的协同缓蚀效应；随着分子内羟乙基的增加，其缓蚀性增强。Ａ３钢在乙醇胺钼酸盐溶液中的     

核桃青皮提取物和十二烷基硫酸钠对冷轧钢在H3PO4溶液中的缓蚀协同效应

目的研究核桃青皮提取物(WGHE)和阴离子表面活性剂十二烷基硫酸钠(SDS)混合复配后,对冷轧钢(CRS)在H3PO4中的缓蚀协同效应,揭示缓蚀协同性能影响规律,并探究缓蚀协同机理。方法采用回流提取法从农林废弃物核桃青皮中提取制备出WGHE。利用失重法、电化学法、紫外光谱(UV)、扫描电子显微镜(SEM)、原子力显微镜(AFM)研究WGHE和SDS的复配缓蚀协同性能、电化学作用机理、紫外吸收曲线以及钢表面的微观形貌。结果高浓度的WGHE对冷轧钢在1.0 mol/L H3PO4中具有较好的缓蚀作用,但低浓度时的缓蚀效果较差。单独SDS使用时,最大缓蚀率不超过60%;将WGHE与SDS复配后,缓蚀性能可进一步提升,尤其在WGHE用量为10～40 mg/L时,复配协同作用显著。缓蚀率随着缓蚀剂浓度的增加而升高,但随着温度的上升有所降低,WGHE、SDS复配前后在钢的表面吸附均符合Langmuir吸附等温式。动电位极化曲线表明,WGHE、SDS为阴极抑制型缓蚀剂,但WGHE/SDS为混合抑制性缓蚀剂。Nyquist图在高频区呈单一弥散容抗弧,而在低频区出现小段感抗弧,WGHE与SDS复配后电荷转移电阻显著增大。协同体系中WGHE和SDS会发生相互作用。SEM和AFM所呈现的微观形貌更加清晰地表明WGHE/SDS具有良好的缓蚀协同性能。结论 WGHE和SDS对冷轧钢在1.0 mol/L H3PO4中具有明显的缓蚀协同效应,复配后缓蚀性能进一步提升,同时有效抑制了钢的阴极和阳极腐蚀反应。     

Inhibition of corrosion of aluminium-51S in hydrochloric acid solutions

The paper describes the performance of aliphatic polyamines and ethanolamine as corrosion inhibitors for Al-51S in hydrochloric acid solutions. These inhibitors function mainly by adsorption and their neutralizing effect has a secondary role in inhibition. Activation energies in the presence and absence of inhibitors have been given. The performance of inhibitors under the influence of external cathodic polarization has been evaluated. The protective potential is not a constant value and varies with each system, and changes with inhibitor concentration. It seems that an increase in ethylenediamine units in the linear chain does not favour inhibitive action. All inhibitors are predominantly cathodic in action.     

Phenazone and aminophenazone as corrosion inhibitors for aluminum in HCl solution

The corrosion behavior of aluminum in 1 M HCl solution in the absence and presence of phenazone and aminophenazone was investigated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results of these techniques show that, the inhibition efficiency of these compounds depends on their concentration and chemical structure. The inhibitive action of these compounds was discussed in terms of blocking the electrode surface by adsorption of the molecules through the active centers contained in their structure. The adsorption process was found to obey Temkin isotherm model. The effect of temperature on the rate of corrosion in the absence and presence of these compounds was also, studied. Some activated thermodynamic parameters were computed and discussed. Potentiodynamic polarization data indicated that these compounds act as cathodic type inhibitors. From impedance data it is found that the corrosion of aluminum is controlled by charge transfer process at all concentrations of inhibitors. Quantum chemical parameters were constructed in order to characterize the inhibition performance of the tested molecules.     

新型铜缓蚀剂的缓蚀性能及机理探讨

通过挂片试验，电化学研究及表面分析，研究了W及 其与BTA的复合配方WB在内冷水中对发电机空芯铜导线的缓蚀作用，并与BTA的缓蚀性能进行 了对比.研究结果表明，W对铜具有较好的缓蚀作用，与BTA复配后，其缓蚀作用比W及BTA单 独使用时都强，是一种主要阻滞阳极过程的混合型缓蚀剂.     

The effect of some B-diketo compounds on the retardation of aluminium dissolution in HCl

The inhibitive action of some B-diketo compounds on the dissolution of aluminium in 2M HCl has been investigated by hydrogen evolution, thermometric and weight loss techniques. The adsorbability of inhibitors is dependent on the basicity of the oxygen and nitrogen sites involved. The dissolution reaction of aluminium in hydrochloric acid solutions is zero order and remains so when B-diketo compounds are present. The rate constant decreases as the inhibition efficiency increases. The activation energy of the dissolution reaction increases with decreasing acid concentration and increasing inhibitor concentration. Values of the Arrhenius activation energies agree with those obtained for an activation controlled process.     

Root and shoot extracts of <Emphasis Type="Italic">Ajuga chamaecistus</Emphasis> subsp. <Emphasis Type="Italic">scoparia</Emphasis> as natural inhibitors for 304 stainless steel corrosion in strong acidic medium

The inhibitive action of root and shoot extracts of Ajuga chamaecistus subsp. scoparia as a green inhibitors on corrosion of 304 stainless steel in the 6.0 M HCl solution was studied by the weight loss method, potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, and atomic force microscopy. The results demonstrate that the extracts act as a show mixed-type inhibitor. The Nyquist plots display an increase of the charge transfer resistance with an increase of the inhibitor concentration and a decrease of the double layer capacitance. The effect of temperature and related activation parameters was deliberate. Adsorption of the extract followed the Langmuir isotherm model. The inhibition efficiencies found from electrochemical tests were in good agreement with those observed via the weight loss method. The inhibition efficiencies for root and shoot extracts are 99.4 and 99.6%, respectively.     

Comparative study of protection of AA 2024-T3 exposed to rare earth salts solutions

The inhibitive effects of the dibutyl phosphate anion in cerium dibutylphosphate [Ce(dbp)₃] on AA 2024-T351 immersed in 0·05M NaCl were evaluated by comparison with immersion in cerium chloride (CeCl₃) in 0·05M NaCl as well as 0·05M NaCl alone. Scanning electron microscopy and energy dispersive X-ray hyperspectral mapping were used to examine the surfaces after exposure to the different inhibitor solutions. It was found that the dibutylphosphate anion produced additional inhibition for the matrix and the S phase intermetallic particles. The most significant mode of corrosion in the absence of inhibitors was in the form of rings of corrosion product. CeCl₃ largely suppressed the formation of the rings of corrosion product, and the Ce(dbp)₃ entirely eliminated them (for the time scales investigated here), indicating the additional inhibitive action of the dibutylphosphate anion.     

Inhibition of Zinc Corrosion by Some Benzaldehyde Derivatives in HCl Solution

The effect of some benzaldehyde derivatives on the corrosion of zinc in 0.5?M HCl solution is studied in this article using mass loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) techniques. The percentage inhibition efficiency (%In) was found to increase with increasing concentration of the inhibitor and with decreasing temperature. Polarization studies indicated that all of the compounds studied are mixed-type inhibitors. The inhibitive action of these benzaldehyde derivatives has been discussed in view of the adsorption on the zinc surface. The adsorption process follows Temkin??s isotherm. The addition of KSCN, KI, and KBr to benzaldehyde derivatives has enhanced the inhibition efficiency because of synergistic effect. The mechanism of inhibition process is discussed in the light of the chemical structures of the investigated inhibitors.     

Mangrove tannins and their flavanoid monomers as alternative steel corrosion inhibitors in acidic medium

The inhibitive behaviour on steel of flavanoid monomers that constitute mangrove tannins namely catechin, epicatechin, epigallocatechin and epicatechingallate was investigated in an aerated HCl solution via electrochemical methods. The monomers were found to be mainly cathodic inhibitors and the inhibition efficiency was dependent on concentration. To explain the adsorptive behaviour of the molecules on the steel surface, a semiempirical approach involving quantum chemical calculations using HyperChem 6.0 was undertaken. The HOMO electronic density of the molecule was used to explain the inhibiting mechanism. The most probable adsorption centers were found in the vicinity of the phenolic groups. In a second part, the use of mangrove tannin, extracted from the mangrove barks as steel corrosion inhibitors in acidic media was investigated and its inhibitive efficiency was compared with that of commercial mimosa, quebracho and chestnut tannins. The inhibitive performance of mangrove tannins was comparable to the other tannins investigated, indicating their potential in corrosion protection.