一种海水缓蚀剂缓蚀行为的研究

利用电化学方法和表面分析测试技术，研究了有机膦酸醇酯类缓蚀剂(YKI-05)对于907A钢在天然海水中的缓蚀行为．实验表明，在静态海水中，浓度为300mg／L的YKI-05缓蚀剂能在907A钢表面形成稳定的缓蚀膜层，是一负催化阴极型缓蚀剂，在实验周期内其对907A钢的缓蚀效率较高；并用原子力显微镜(AFM)和俄歇电子能谱(AES)对该缓蚀膜的表面形貌和成分进行分析．     

红四氮唑对冷轧钢在磷酸溶液中的缓蚀性能

用失重法、动电位极化曲线和原子力显微镜（AFM）研究了红四氮唑对冷轧钢在1.0 mol/L~10.0 mol/L H₃PO₄溶液中的缓蚀作用。结果表明：红四氮唑对冷轧钢具有中等程度的缓蚀作用,为混合抑制型缓蚀剂,且在钢表面的吸附符合Freundlich吸附模型;通过吸附热力学和腐蚀动力学公式分别求出了相应的吸附热力学参数和动力学参数,并根据这些参数详细讨论了缓蚀作用机理;AFM测试结果表明添加红四氮唑后钢表面较为平整,粗糙度降低。     

十二胺在碳钢表面的吸附行为

利用原子力显微镜（AFM）、动电位扫描及润湿角测量等手段研究了盐酸溶液中十二胺在碳钢表面的吸附行为及其对碳钢腐蚀行为的影响。结果表明：十二胺在碳钢表面形成了单分子吸附层。其对碳钢的缓蚀机理主要为“几何覆盖效应”，一个十二胺分子平均可以取代2．32个水分子；碳钢表面的润湿性随缓蚀剂浓度的增大而减弱。AFM电流图像显示，碳钢表面有十二胺吸附的部位导电性能明显减弱；AFM力—距离曲线表明，碳钢表面有缓蚀剂吸附的部位呈现出明显的黏附力。     

锰硅系贝氏体／马氏体复相钢中贝氏体精细结构的研究

利用原子力显微镜（AFM）、扫描隧道显微镜（STM）、透射电子显微镜（TEM）、光学显微镜（OM）等分析手段对锰硅系贝氏体／马氏体复相钢中贝氏体的结构进行了研究。观察到氏碳锰硅钢中的贝氏体组织由亚片条、亚单元组成,利用原子力显微镜（AFM）及透射电子显微镜（TEM）在贝氏体单元中发现有以残余奥氏体膜为分界面的精细结构的存在。观测结果可用贝氏体相变的激发形核－台阶长大机制做合理解释,为锰硅系贝氏体／马氏体复相钢的合金组织设计、组织结构和性能关系的研究提提供了实验依据。     

电化学原子力显微镜在腐蚀研究中的应用

简述了电化学原子力显微镜的原理和成像模式,重点综述了其在合金中的相电化学、钝化、微生物腐蚀、缓蚀剂、涂层领域的应用,涵盖了成像、表面电位测量和力-距离曲线测量等多种功能;分析了其存在的一些局限性并提出了展望。     

脂肪酰胺类缓蚀剂对X65钢抗CO2腐蚀的机理研究

通过电化学极化及电化学阻抗谱（EIS）测试研究了一种脂肪酰胺类缓蚀剂对X65低碳钢抗CO2腐蚀的机理,结果表明,该类缓蚀剂是一种阳极型缓蚀剂,属于界面吸附型,通过负催化机制产生缓蚀作用,对X65低碳钢抗CO2腐蚀具有良好的效果,其缓蚀效率随浓度的增加而提高,存在极值现象,在0．5g／L时达到最大．其阻抗谱有2个时间常数,相应的等效电路的描述码（CDC）为：R（C（R（CR）））．     

有机涂层防护性能与失效评价研究进展

简要综述了近年来评价有机涂层防护与失效的宏观与微观电化学方法。介绍了直流电化学极化、电化学阻抗谱(EIS)、电化学噪声(ENM)等宏观电化学测试方法,此类方法主要反映涂装材料的整体防护特性和老化失效规律;而微区电化学测量方法,如局部电化学阻抗(LEIS)、扫描开尔文探针(SKP)、扫描振动电极(SVET)、扫描电化学显微镜(SECM)和原子力显微镜(AFM)等,主要用于涂层局部或微缺陷的检测,以及界面层物理化学变化规律的研究。简述了应用这些方法所取得的成果,对进一步研究涂层失效具有一定指导意义。     

AFM技术在微生物腐蚀研究中的应用

介绍了原子力显微镜(AFM)的工作原理、操作模式以 及在微生物腐蚀研究中的应用,包括原位观察细菌和微生物膜形貌、测量力-距离曲线研究微生物在材料表面的粘附力、测量材料表面电位的不同得知生物膜厚度和腐蚀程度.同时还介绍了电化学原子力显微镜的应用.     

十二胺对氯化钠溶液中铜镍合金的缓蚀行为及吸附机理的研究

用电化学方法和原子力显微镜(AFM)研究了NaCl溶液中十二胺在铜镍合金表面的缓蚀及吸附行为.结果表明,十二胺对阴极和阳极反应均有抑制作用,但主要抑制了阴极反应.吸附模型的拟合结果证明十二胺在铜镍合金表面的吸附符合Flory-Huggins等温线模型.十二胺吸附膜改变了电极表面双电层结构,使零电荷电位正移.AFM相位图显示,随着缓蚀剂浓度增加,缓蚀剂吸附层变得更加致密和有序,导致缓蚀效率增加.AFM力曲线测试结果指出,含有十二胺的溶液中力曲线显示粘附力特性,而且探针与样品表面之间的长程静电斥力与空白溶液相比有减小趋势.     

有机涂层防护性能的电化学研究进展

曝晒、盐雾、浸泡、干湿循环、老化等传统的有机涂层防护性能研究方法,因测试周期长,测试结果多为定性分析,不能使涂层材料进行快速检验而投入评估使用.正是由于传统测试方法存在许多局限性,故综述了稳态电化学测试方法和暂态电化学测试方法这两种新技术在有机涂层防护性能中的应用与进展.介绍了动电位极化曲线法、极化电阻法等稳态电化学测试方法,这类方法主要反映涂层的极化电阻和腐蚀速度,并且方法简单,可直接分析实验数据,被广泛应用于有机涂层的失效分析中.而暂态电化学测试方法主要包括电化学阻抗法(EIS)、局部阻抗法(LEIS)、扫描Kelvin探针法(SKP)及电化学噪声(EN)等,主要用于研究涂层防护机制和局部缺陷.目前,在有机涂层防护性能和机理研究中,应用最多的是电化学交流阻抗法.丝束电极法(WBE)、扫描电化学显微镜(SECM)以及原子力显微镜(AFM)用于研究金属/涂层界面物理化学变化规律.阐述了上述方法在涂层防护研究中的应用成果及其优势和不足,指出对于深层次的涂层防护研究,需要应用多种测试手段,从不同的角度和方面综合分析,全面评估涂层的使用寿命.     

Application of Anise Extract for Corrosion Inhibition of Carbon Steel in CO<Subscript>2</Subscript> Saturated 3.0% NaCl Solution

The corrosion inhibition of carbon steel in CO₂-saturated 3% NaCl solution by anise extract (AE) dissolved in ethylene glycol (EG) was studied using weight loss, electrochemical and surface analysis (AFM) techniques. Inhibition efficiency increased with increase in AE concentration and temperature, reaching maximum value of 93% at 400 ppm AE concentration. Polarization results show that AE functions as a mixed-type inhibitor. Corrosion inhibition is assumed to occur by physicochemical adsorption following Langmuir adsorption isotherm model. Morphological studies of the carbon steel electrode surface undertaken by AFM confirm the adsorption of the extract on the metal surface.     

咪唑啉类化合物在HCl溶液中对碳钢的缓蚀机理分析

目的 研究咪唑啉（IM）及咪唑啉基脲（IU）在盐酸溶液中对碳钢的缓蚀性能。方法 采用静态失重法、电化学测试技术、表面形貌及官能团分析、热力学等温方程等方法,研究缓蚀剂在不同温度的盐酸溶液中对Q235碳钢的缓蚀性能和吸附规律。结果 在静态失重试验中,室温下,随着IM、IU缓蚀剂的加入,碳钢的腐蚀速率从12.54 mg/(cm2?h)分别降低到5.132、0.145 mg/(cm2?h),IM、IU的缓蚀率分别为59.1%和98.9%。随着温度的升高,缓蚀效率略有下降。极化曲线试验表明,增加两种缓蚀剂的浓度,腐蚀电位负移,阳极电流密度下降明显。交流阻抗的测试显示,随着两种缓蚀剂浓度的增大,拟合参数Rct增大、Cdl减小,证明缓蚀剂在金属表面取代了水,并吸附成膜。研究等温吸附模型发现,两种缓蚀剂分子在碳钢表面的吸附符合Langmuir等温吸附方程,且根据SEM及XPS分析,证明缓蚀剂分子通过N原子与金属形成共价键,在金属表面吸附成膜。结论 咪唑啉和咪唑啉基脲对碳钢均具有缓蚀效果,且咪唑啉基脲的缓蚀效果更优异。两种缓蚀剂均属于混合型缓蚀剂,且以抑制阴极腐蚀反应速率为主。两种咪唑啉化合物在碳钢表面的吸附过程为自发放热过程,其吸附规律遵循Langmuir吸附等温模型,属于单分子层吸附。     

Inhibiting effects of some mercapto-triazole derivatives on the corrosion of mild steel in 1.0 M HCl medium

The effect of some mercapto-triazole derivatives synthesized in the laboratory containing different hetero atoms and substituents in the organic structures on the corrosion and hydrogen permeation of mild steel in 1.0 M HCl was investigated by weight loss and various electrochemical techniques. Results obtained reveal that all the mercapto-triazole derivatives perform excellently as corrosion inhibitors for mild steel in 1.0 M HCl. Potentiodynamic polarization studies have shown that all these compounds suppress both the anodic and cathodic process and they behave as mixed-type inhibitors. Double layer capacitance and charge transfer resistance values were derived from Nyquist plots obtained from AC impedance studies. Changes in impedance parameters are indicative of the adsorption of these compounds on the metal surface. The inhibition efficiency mainly depends on the nature of the investigated compounds. The values of the inhibition efficiency calculated from these techniques are in reasonably good agreement. The extent of reduction of hydrogen permeation current through mild steel surface was studied by the hydrogen electropermeation technique. The adsorption of these compounds on mild steel surface is found to obey Langmuir adsorption isotherm. The free energy of adsorption for inhibiting process was determined on the basis of Langmuir adsorption isotherm.     

Investigation of modified layered double hydroxide nanocontainer as a corrosion inhibitor for carbon steel in acidic medium

A modified layered double hydroxide (MLDH), was tested as a corrosion inhibitor for mild steel in 1 mol L^–1 HCl using electrochemical techniques. The inhibition efficiency was found to increase with increasing inhibitor concentration up to maximum 96.6% for 100 ppm at 30°C. The effects of temperature (35–65°C) on the inhibition of corrosion have also been investigated. The langmuir adsorption isotherm was found to provide the best explanation of the adsorption behavior of the investigated inhibitor on the mild steel surface. The calculated adsorption thermodynamic parameters reveal a physical adsorption of the inhibitors on the metal surface, endothermic process accompanied by an increase in entropy. Some samples of mild steel and MLDH particles were examined by SEM.     

Inhibitor effects of triazole derivatives on corrosion of mild steel in acidic media

Abstract

The inhibitive action of triazoles on the corrosion of mild steel has been studied through weight loss and various electrochemical techniques. Results obtained show that these organic compounds are very good inhibitors. Triazoles are able to reduce the corrosion of steel more effectively in 1M HCl than in 0·5M H₂ SO₄ . Potentiodynamic polarisation studies clearly reveal the type of inhibitor. Changes in impedance parameters (the charge transfer resistance R_t and the double layer capacitance C_dl ) are related to adsorption of triazoles on the metal surface, leading to the formation of a protective film which grows with increasing exposure time. The adsorption of these inhibitors on the mild steel surface in both acids obeys the Langmuir adsorption isotherm. The comparative study of corrosion inhibition of triazole derivatives indicates that the efficiency of the 4-aminotriazole is greater than that of the 4H-triazole.     

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．     

Experimental evaluation of quinolinium and isoquinolinium derivatives as corrosion inhibitors of mild steel in 0.5 M H<Subscript>2</Subscript>SO<Subscript>4</Subscript> solution

The 1-methylquinolinium iodide (I) Qui⁺, I^– and 2-methylisoquinolinium iodide isoQui⁺, I^– were investigated as a corrosion inhibitors for mild steel in sulfuric acid using electrochemical impedance spectroscopy and potentiodynamic polarization techniques. The results indicated that the corrosion inhibition efficiency and extent of surface coverage were increased with increase in inhibitors concentrations. Polarization curves revealed that both inhibitors acted as a mixed-type inhibitor. The thermodynamic parameters were evaluated for corrosion inhibition process. The adsorption of both inhibitors on mild steel surface obeyed Langmuir adsorption isotherm.     

两种曼尼希碱缓蚀剂的缓蚀性能

采用甲醛/苯甲醛、苯乙酮和水合肼为原料分别合成了AJ和BJ两种曼尼希碱缓蚀剂。通过静态挂片失重法、电化学测试法等方法研究了在15%HCl(质量分数)溶液中,这两种缓蚀剂对N80钢的缓蚀性能。结果表明:在15%的HCl溶液中,AJ和BJ缓蚀剂对N80钢具有良好的缓蚀作用,且BJ缓蚀剂的缓蚀效果要优于AJ缓蚀剂的;两种缓蚀剂均为阳极型缓蚀剂,都能自发吸附在N80钢表面,其行为均符合Langmuir吸附等温式。     

Electrochemical and surface analysis studies on corrosion inhibition of Q235 steel by imidazoline derivative against CO2 corrosion

The inhibition performance of a newly synthesized thioureido imidazoline inhibitor (TAI) in CO₂ corrosion was studied by using electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). Results show that the values of inhibition efficiency show peak-value-phenomenon at concentration of 0.15 mmol dm⁻³ owing to the change of adsorption mode. The adsorption of protonated TAI molecules on the negatively charged steel surface makes the potential of zero charge (PZC) shift to positive direction, and the long-range electrostatic exclusive forces between AFM tip and sample surface are reduced by screening effect of surface charges.