盐酸介质中苯扎溴铵在铁表面的吸附行为及其与肉桂醛的协同…

采用失重法和极化曲线法研究了Ｆｅ在苯扎溴铵缓蚀的盐酸介质中的腐蚀动力学特征及苯扎溴铵与肉桂醛在盐酸介质中对Ｆｅ腐蚀的协同缓蚀作用，导出了腐蚀速度方程及有磁的动力学参数并应用吸附理论和共吸附模型解释了苯扎溴铵在铁表面的吸附行为。探讨了盐酸介质中ＤＢＤＡＢ与ＣＡ协同缓蚀作用的特点和机理。     

盐酸介质中脱氢松香基咪唑啉缓蚀剂对Q235钢缓蚀性研究

利用静态失重法测定了脱氢松香基咪唑啉系缓蚀剂在盐酸介质中Ｑ２３５碳钢的缓蚀速度和腐蚀效率。研究Ｑ２３５钢在盐酸介质中的腐蚀动力学特征,求出了腐蚀速度方程及相关动力学参数。结果表明,作为一种吸附型有机缓蚀剂,脱氢松香基咪唑啉在盐酸中对Ｑ２３５钢具有较强的缓蚀能力,且缓蚀效率随温度升高而增大。     

癸胺与I~-对铝的协同缓蚀作用

应用动电位扫描法和交流阻抗法研究了盐酸介质中KI和癸胺对铝的协同缓蚀作用.结果表明:铝在盐酸中的腐蚀以阴极控制为主;KI和癸胺有较好的协同作用,癸胺在协同体系中对铝的缓蚀起主导作用.     

磺胺嘧啶和硫氰酸钠在硫酸介质中对Q235钢的缓蚀协同作用

以磺胺嘧啶(SD)和硫氰酸钠(NaSCN)在0.5 mol/L硫酸介质中对Q235钢的缓蚀作用为研究对象,采用失重法、极化曲线法、扫描电子显微镜表征等方法研究了两者复配的协同缓蚀行为及吸附模型,并通过均匀设计实验获得了复配缓蚀剂的最佳配方。结果表明:磺胺嘧啶及其复配物均为混合型缓蚀剂,都符合Langmuir等温吸附模型;复配后两种缓蚀剂之间的协同效应明显,吸附热力学和动力学参数明显改善,缓蚀率显著提高。扫描电子显微镜测试结果显示,磺胺嘧啶复配后钢表面腐蚀程度明显降低,由局部腐蚀为主转换为均匀腐蚀为主。均匀设计试验获得的复配缓蚀剂最佳配方为:磺胺嘧啶1200 mg/L、NaSCN 960 mg/L,缓蚀率高达92.65%。     

氢氟酸溶液中苯扎溴铵对锌的缓蚀作用及吸附热力学研究

采用失重法研究了在不同温度下,不同浓度的苯扎溴铵在3%的氢氟酸溶液中对锌的缓蚀作用,实验结果表明：在3%的氢氟酸溶液中,苯扎溴铵对锌的腐蚀具有良好的抑制作用。苯扎溴铵浓度低时,随浓度增大,缓蚀作用加强;当其浓度达到一定值后,缓蚀作用基本保持不变。根据结构理论分析,苯扎溴铵在锌表面的吸附是产生缓蚀作用的重要原因,吸附规律服从Langmuir等温式。采用Sekine方法处理实验数据,获得了一系列相关热力学参数。     

盐酸介质中APPB对A3钢的缓蚀作用

采用失重法、动电位极化法和电化学阻抗谱评价了1-(1-苯胺基-3-苯基-2-丙烯基)-2,3-二氢苯并咪唑(APPB)在盐酸介质中对A3钢的缓蚀作用。结果表明,APPB的缓蚀率随着盐酸浓度的升高和缓蚀剂浓度增大而升高,随着温度升高而下降。加入APPB后,提高了腐蚀反应的活化能。APPB能自发地吸附在A3钢表面,其吸附行为符合Langmuir吸附等温式。同时用量子化学方法研究了APPB分子结构与缓蚀性能的关系。     

SO2-4 ,PO3 4- 对曼尼希碱酸化缓蚀剂缓蚀性能的影响

目的：研究废酸液中介质离子对曼尼希碱酸化缓蚀剂缓蚀性能的影响,以解决碳钢在酸液中的腐蚀问题。方法采用静态失重法、极化曲线、扫描电镜及能谱分析法,研究SO2-4,PO3-4对曼尼希碱型酸化缓蚀剂缓蚀性能的影响,并探究其作用机理。结果在10%(质量分数)盐酸、0.1%(质量分数)曼尼希碱的缓蚀介质中,随SO2-4质量分数的增大,腐蚀电流密度由2.81μA/cm2增加至7.32μA/cm2,腐蚀速率显著增大,缓蚀效果变弱;随PO3-4质量分数的增加,腐蚀电流密度由2.81μA/cm2减小至2.41μA/cm2,腐蚀速率减小,缓蚀效果变强。结论 SO2-4会通过钢铁表面已经形成的吸附膜上的细孔和缺陷渗入膜内,使膜发生开裂,从而侵蚀和破坏已经形成的吸附膜,抑制缓蚀剂的缓蚀效果;PO3-4与腐蚀产物Fe3+络合并在钢材表面形成一层致密的保护层,使缓蚀剂形成的吸附膜更加致密,阻止腐蚀性介质与金属表面接触,同时增加对离子或溶解氧的扩散阻力,提高缓蚀剂的缓蚀效果。     

SO_4~(2-),PO_4~(3-)对曼尼希碱酸化缓蚀剂缓蚀性能的影响

目的研究废酸液中介质离子对曼尼希碱酸化缓蚀剂缓蚀性能的影响,以解决碳钢在酸液中的腐蚀问题。方法采用静态失重法、极化曲线、扫描电镜及能谱分析法,研究SO2-4,PO3-4对曼尼希碱型酸化缓蚀剂缓蚀性能的影响,并探究其作用机理。结果在10%(质量分数)盐酸、0.1%(质量分数)曼尼希碱的缓蚀介质中,随SO2-4质量分数的增大,腐蚀电流密度由2.81μA/cm2增加至7.32μA/cm2,腐蚀速率显著增大,缓蚀效果变弱;随PO3-4质量分数的增加,腐蚀电流密度由2.81μA/cm2减小至2.41μA/cm2,腐蚀速率减小,缓蚀效果变强。结论 SO2-4会通过钢铁表面已经形成的吸附膜上的细孔和缺陷渗入膜内,使膜发生开裂,从而侵蚀和破坏已经形成的吸附膜,抑制缓蚀剂的缓蚀效果;PO3-4与腐蚀产物Fe3+络合并在钢材表面形成一层致密的保护层,使缓蚀剂形成的吸附膜更加致密,阻止腐蚀性介质与金属表面接触,同时增加对离子或溶解氧的扩散阻力,提高缓蚀剂的缓蚀效果。     

3-苯基-4-苯亚甲基氨基-5-巯基-1,2,4-三唑与碘化钾的缓蚀协同效应

合成了新型巯基三唑化合物3-苯基-4-苯亚甲基氨基-5-巯基-1,2,4-三唑(简称为PABMT)，用动电位扫描极化曲线法和交流阻抗法研究了巯基三唑化合物PABMT与碘化钾(KI)在1.0 mol/L HCl介质中对Q235钢的协同缓蚀作用.结果表明，PABMT和KI之间有良好的协同效应，二者复合后对1.0 mol/L HCl介质中碳钢腐蚀具有很好的抑制作用.利用Bockris Swinkels吸附等温方程计算了PABMT KI协同缓蚀体系的相关吸附热力学函数.     

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。     

Inhibition effect of 4-phenylthiazole derivatives on corrosion of 304L stainless steel in HCl solution

Some 4-phenylthiazole derivatives were tested as corrosion inhibitors for 304L stainless steel in 3.0 M HCl using weight loss and galvanostatic techniques. The results showed that the inhibition efficiency increases with increasing the concentration of the 4-phenylthiazole derivatives. Polarization measurements showed that these derivatives act as mixed-type inhibitors. The adsorption of these inhibitors on the surface of stainless steel follows Temkin’s adsorption isotherm and kinetic model. The effect of temperature on the corrosion was investigated by the weight loss method and some thermodynamic parameters were calculated. The synergistic influence caused by thiocyanate ion on the inhibition of corrosion of 304L stainless steel in 3.0 M HCl in the presence of 4-phenylthiazole derivatives has been studied using weight loss method. The inhibition action of these 4-phenylthiazole derivatives was discussed in terms of its adsorption on the metal surface.     

Na2MoO4和EDTA在HCl溶液中对冷轧钢的缓蚀协同效应

用失重法和电化学法研究了在0.5 mol/L HCl中Na2MoO4和EDTA对冷轧钢的缓蚀协同作用。研究结果表明,单独的Na2MoO4和EDTA对冷轧钢具有一定的缓蚀作用,为阳极型缓蚀剂,且在钢表面的吸附符合Temkin吸附模型。当两者复配后产生了明显的缓蚀协同效应,为一抑制阳极为主的混合抑制型缓蚀剂,并讨论了产生缓蚀协同效应的原因。     

The synergistic inhibitive effect and some quantum chemical parameters of 2,3-diaminonaphthalene and iodide ions on the hydrochloric acid corrosion of aluminium

The effect of iodide ions on the inhibitive performance of 2,3-diaminonaphthalene (2,3-DAN) in 1 M HCl for aluminium corrosion has been studied using hydrogen evolution (gasometry) measurements at 30 and 40 °C. Results obtained showed that the presence of 2,3-DAN molecules in the corrosive medium (1 M HCl solution) inhibits the corrosion process of aluminium and as the concentration of 2,3-DAN increases the inhibition efficiency also increased at the studied temperatures. A synergistic effect was observed between KI and 2,3-DAN. The experimental results suggest that the presence of iodide ions in the solutions stabilized the adsorption of 2,3-DAN molecules on the metal surfaces and, therefore improve the inhibition efficiency of 2,3-DAN. Phenomenon of physical adsorption is proposed for the inhibition and the process followed the Freundlich adsorption isotherm. The activation energy (E_a), heat of adsorption (Q_ads) and free energy of adsorption for the corrosion process (ΔG_ads) have been evaluated at the different temperatures and the values support the results obtained. Some quantum chemical parameters and the Mulliken charge densities for 2,3-diaminonaphthalene were calculated by the AM1 Semi-empirical method to provide further insight into the mechanism of inhibition of the corrosion process.     

Corrosion inhibition of austenitic stainless steel by some pyrimidine compounds in hydrochloric acid

The inhibition effect of two pyrimidine derivatives on the corrosion of austenitic stainless steel in 1 M HCl has been studied by Tafel plot, linear polarization, and electrochemical impedance spectroscopy (EIS) at 298 K. Results showed that compounds inhibited steel corrosion in a 1 M HCl solution and inhibition efficiencies increased with the concentration of inhibitor. Polarization curves indicated that all studied pyrimidine derivatives act as mixed type (cathodic/anodic) inhibitors. The adsorption of the inhibitors on the stainless steel surface was found to obey the Langmuir and Dubinin–Radushkevich adsorption isotherm models. Negative values of ΔG_ads in the acidic media ensured the spontaneity of the adsorption process.     

Inhibition of copper corrosion in acidic chloride pickling solutions by 5-(3-aminophenyl)-tetrazole as a corrosion inhibitor

Inhibition of copper corrosion in acidic chloride pickling (0.5 M HCl) solutions by 5-(3-Aminophenyl)-tetrazole (APT) as a corrosion inhibitor has been studied using potentiodynamic polarization, chronoamperometry (CA), electrochemical impedance spectroscopy (EIS), weight-loss and Raman spectroscopy investigations. Electrochemical measurements showed that the presence of APT and the increase of its concentration significantly decrease the cathodic, anodic, and corrosion currents as well as corrosion rates. This effect also decreases the dissolution currents of copper at 200 mV vs. Ag/AgCl, and greatly increases surface and polarization resistances and inhibition efficiency as indicated by CA and EIS measurements. Weight-loss data revealed that the corrosion rate of copper decreases to a minimum and the inhibition efficiency increases to a maximum in the presence of APT and upon increasing of its concentration even after 72 h of copper coupons immersion. Comparing the Raman spectrum obtained on the copper surface after its immersion in HCl solution containing 1.0 mM APT for 72 h to the spectrum obtained for the solid APT alone indicated that APT molecules inhibit the corrosion of copper via their adsorption onto its surface.     

THE SYNERGISTIC INHIBITION STUDIES OF SEVERAL AMINES AND CHLORIDE ION ON IRON IN THE ACIDIC PERCHLORIDE SOLUTIONS

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几种离子对硫化亚铁膜离子选择性的影响

使用除氧的FeCl2和Na2S溶液在纤维素膜上制备出了硫化亚铁膜,通过测量膜电位曲线的方法,研究了硫化亚铁膜的离子选择性和几种阴、阳离子以及咪唑啉缓蚀剂对膜的离子选择性的影响.结果表明,硫化亚铁膜是一种双极结构膜,靠近FeCl2溶液一侧为阳离子选择性,与Na2S溶液接触一侧为阴离子选择性.这种双极结构膜能够加速钢铁的阳极溶解进而导致严重的腐蚀.硫化亚铁膜吸附Ca2+、Mg2+、Ba2+等阳离子后,由双极膜变为阴离子选择性膜;而吸附MoO2-4、PO3-4以及咪唑啉缓蚀剂后则变为阳离子选择性膜,这种阳离子选择性膜对膜下金属有一定的保护作用.同时采用动电位扫描法测试了表面形成硫化亚铁膜的A3钢在含有不同离子的3%NaCl溶液中的极化曲线.  TQ0288     

Synergistic effect of iodide ion and polyacrylic acid on corrosion inhibition of iron in H2SO4 investigated by electrochemical techniques

Corrosion inhibition of iron in H₂SO₄ by polyacrylic acid (PAA) was investigated using electrochemical techniques at 30 °C. Results obtained indicate that PAA inhibited the corrosion of iron in the acid medium. Inhibition efficiency increases with increase in PAA concentration and synergistically enhanced on addition of iodide ions. Potentiodynamic polarization results suggest that PAA functions as a modest cathodic inhibitor. The adsorption of PAA onto the iron surface followed Temkin adsorption isotherm. FTIR analysis revealed that the synergistic effect due to co-adsorption of iodide ions and PAA is co-operative in nature.     

Lignin terpolymer for corrosion inhibition of mild steel in 10% hydrochloric acid medium

Lignin terpolymer has been obtained by grafting copolymerization of both dimethyl diallyl ammonium chloride (DMDAAC) and acrylamide (AM) onto lignin. The corrosion inhibition properties of the terpolymer were tested. The results showed that the highest corrosion inhibition percentage was over 95% in 10% HCl acid medium at 25 °C and 80 °C. The lignin terpolymer inhibitor adsorption followed Temkin isotherm at 25 °C and 80 °C, and the adsorption capability was in reverse proportion to the temperature according to −ΔG_ads. The effects of corrosion inhibition are the comprehensive synergistic effect through the graft reaction among lignin, AM and DMDAAC.     

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.