3-氨基-1,2,4-三氮唑自组装膜对Cu-Ni合金缓蚀作用及吸附机理研究

利用3-氨基-1,2,4-三氮唑(ATA)金属处理剂在Cu-Ni合金表面制备了自组装单分子膜(SAMs),用电化学方法研究ATA SAMs对Cu-Ni合金的缓蚀作用及其吸附行为.结果表明, ATA分子易在Cu-Ni合金表面形成稳定的ATA SAMs,抑制了Cu-Ni合金的阳极氧化过程,改变了电极表面双电层结构,使零电荷电位正移,固/液界面双电层电容明显降低,有良好的缓蚀效果,这与交流阻抗和极化曲线得到的结论一致.同时研究表明ATA的吸附行为符合Langmuir吸附等温式,吸附机理是典型的化学吸附.     

铜表面三唑硫酮衍生物的自组装及其抗盐酸腐蚀的电化学性能

采用交流阻抗(EIS)、塔菲尔(Tafel)极化曲线和循环伏安法(CV)研究了铜表面3-己基-4-氨基-1,2,4-三唑-5-硫酮(HATT)和5-己基-1,2,4-三唑-3-硫酮(HXTT)自组装膜抗0.5 mol/L盐酸溶液腐蚀的电化学性能。通过接触角、吸附热力学和X射线光电子能谱分析,探究HATT和HXTT在铜表面的自组装机理。结果表明:HATT和HXTT在铜表面的自组装单层膜都能很好地延缓铜的腐蚀。铜表面经5×10~(-5) mol/L HATT和HXTT处理24 h,后所生成的自组装膜对铜在0.5mol/L盐酸溶液中的缓蚀效率分别达到97.33%(HATT)和95.51%(HXTT),HATT的效果更佳。HATT和HXTT都通过其分子中的氮、硫原子与Cu原子结合生成Cu(I)络合物而化学吸附于铜金属表面,形成致密的自组装单层膜,阻隔溶液中Cl-等腐蚀粒子扩散至铜表面,起到缓蚀作用。与此同时,自组装膜中烷基朝外面向溶液,使铜表面由亲水性转化成疏水性。     

三唑化合物在0.5 mol/L硫酸中对Q235钢的缓蚀作用

合成了一种新型三氮唑化合物:1-苯次乙亚氨基-2-巯基-5-[1-(1,3,4-三氮唑)亚甲基]-1,3,4-三氮唑(PMT),并通过失重试验、动电位极化、电化学阻抗谱及扫描电镜方法研究了其在0.5mol/L硫酸溶液中对Q235碳钢的缓蚀作用。结果表明,该三唑化合物在硫酸中对Q235碳钢有较好的缓蚀效果,是混合型缓蚀剂。     

谷氨酸及其衍生物在304不锈钢表面的自组装膜

采用电化学阻抗谱、极化曲线、量子化学和分子动力学,研究了谷氨酸、焦谷氨酰胺、焦谷氨酸三种自组装膜在0.5 mol/L硫酸溶液中对304不锈钢的缓蚀性能.结果表明,三种缓蚀剂均为阴极型缓蚀剂,对不锈钢具有较好的缓蚀作用;在0.02 mol/L的浓度下,随着组装时间的延长,自组装膜对不锈钢的缓蚀效率也相应增强.它们的缓蚀能力与理论EHOMO越高、能量间隙△E越低.自组装分子成键能力越强、缓蚀效率越高相一致.三种缓蚀剂分子中的氮原子、氧原子可以与铁原子形成化学键,发生化学吸附.缓蚀能力依次为:焦谷氨酸＞焦谷氨酰胺＞谷氨酸.     

K2L-SAMs对碳钢在饱和CO2油田水中的缓蚀行为与量子化学研究

利用邻氧乙酸苯甲醛缩对氨基苯磺酸钾盐席夫碱(K2L)缓蚀剂在20#碳钢表面制备自组装单分子膜(SAMs),并通过电化学方法研究缓蚀剂自组装膜的最佳组装时间;采用电化学测试技术和表面分析技术研究K2L-SAMs对碳钢在饱和CO2油田水介质中的缓蚀行为;采用密度泛函理论分析缓蚀剂分子的前线轨道、Mulliken电荷和分子静电势。结果表明:缓蚀剂在碳钢表面自组装3 h后,可以形成稳定、致密的缓蚀膜;在碳钢表面形成的K2L-SAMs能有效抑制碳钢的阴极还原过程,最高缓蚀效率达87.55%;K2L的吸附行为符合Langmuir吸附等温式,吸附机理为典型的化学吸附。量子化学计算结果表明:羧基是K2L分子的主要吸附活性区域,能与碳钢表面铁原子作用形成稳定的配位键。     

香兰素缩3,4-二氨基苯甲酸在45~#钢表面的组装工艺对其缓蚀性能的影响

合成了新型Schiff碱化合物香兰素缩3,4-二氨基苯甲酸(V-dba)。采用红外光谱对其结构进行了表征。研究了V-dba在45#钢电极表面的组装工艺,采用电化学阻抗谱(EIS)和极化曲线方法研究了V-dba自组装膜对45#钢缓蚀性能的影响。结果表明,改变组装时间和组装浓度均对Schiff碱的缓蚀效率产生影响。随着组装浓度的增大,自组装膜增大Schiff碱对钢的缓蚀效率。最佳工艺条件为:组装时间12h,组装摩尔浓度0.360mmol.L-1,缓蚀效率最高。     

1,2,4-三氮唑和苯并三氮唑对316L不锈钢化学机械抛光的影响

为探究1,2,4-三氮唑(TAZ)和苯并三氮唑(BTA)对316L不锈钢化学机械抛光(CMP)的影响及作用机理,在酸性条件下使用TAZ或BTA为缓蚀剂化学机械抛光316L不锈钢,用白光干涉仪观测316L不锈钢抛光后的表面质量,用红外光谱仪表征缓蚀剂的结构,用接触角测量仪检测抛光表面钝化膜的疏水性能,并用电化学工作站分析...     

（E）-3-（咪唑基-1-甲基）肉桂酸自组装膜对铁的缓蚀作用的研究

    用(E)-3-(咪唑基-1-甲基)肉桂酸分子在铁表面形成自组装膜,并用电化学阻抗谱和极化曲线研究不同组装时间对自组装膜缓蚀效果的影响,并运用量子化学计算初步探讨(E)-3-(咪唑基-1-甲基)肉桂酸在铁表面的缓蚀机理.结果表明,(E)-3-(咪唑基-1-甲基)肉桂酸分子能自发吸附在铁表面形成自组装膜,随着组装时间的增加,自组装膜对铁的缓蚀效率也相应增加.     

ATA及其与PASP复配在3.5%NaCl溶液中对碳钢的缓蚀作用

为寻找新的缓蚀荆来解决碳钢的腐蚀问题,采用极化曲线和交流阻抗方法,研究了3-氨基-1,2,4-三氮唑(ATA)及其与聚天冬氨酸(PASP)复配在3.5%NaCl溶液中对碳钢的缓蚀作用,并对比观察了碳钢在未加和加入复配缓蚀荆的3.5%NaCl溶液中浸泡后的腐蚀形貌.结果表明:ATA在3.5%NaCl溶液中对碳钢具有缓蚀作用,属阳极型缓蚀剂,其添加量以25 mg/L为最好,此时的缓蚀效果最佳,缓蚀率可达93.51%;ATA和PASP复配在3.5%NaCl溶液中对碳钢具有缓蚀协同作用,且15 mg/L ATA和10 mg/L PASP复配时的缓蚀协同作用最好,缓蚀率高达99.89%.     

铜表面吡咯烷二硫代氨基甲酸铵自组装膜的拉曼光谱和缓蚀作用

应用表面增强拉曼光谱(SERS)和电化学方法,对铜电极表面吡咯烷二硫代氨基甲酸铵(APDTC)的自组装单层结构、缓蚀性能和吸附行为进行研究。SERS光谱表明:APDTC分子通过硫原子垂直吸附在铜表面形成APDTC自组装单分子膜(APDTC SAMs)。交流阻抗和极化曲线实验表明:在3%NaCl(质量分数)溶液中APDTC SAMs对铜具有很好的缓蚀作用,最高缓蚀效率可达98%;APDTC的吸附行为符合Langmuir吸附等温式,吸附机理是介于化学吸附和物理吸附之间的一种吸附。     

Corrosion control of mild steel using 3,5-bis(4-methoxyphenyl)-4-amino-1,2,4-triazole in normal hydrochloric acid medium

The inhibition performance of the 3,5-bis(4-methoxyphenyl)-4-amino-1,2,4-triazole (4-MAT) on mild steel in normal hydrochloric acid medium (1 M HCl) at 30 °C was tested by weight loss, potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) techniques. This organic compound inhibits the acidic corrosion even at very low concentration, reaching a value of inhibition efficiency up to 98% at a concentration of 3 × 10⁻⁴ M. The results obtained from the different corrosion evaluation techniques are in good agreement. Polarisation curves indicate that 4-MAT is a mixed inhibitor, affecting both cathodic and anodic corrosion currents. Data, obtained from EIS measurements, were analyzed to model the corrosion inhibition process through appropriate equivalent circuit model, a constant phase element (CPE) has been used. The adsorption of 4-MAT on the steel surface, in 1 M HCl solution, obeys to Langmuir’s isotherm with a very high negative value of the free energy of adsorption ΔG°_ads (chemisorption). X-ray photoelectron spectroscopy (XPS) was carried out to establish the mechanism of corrosion inhibition of mild steel in 1 M HCl medium in the presence of 3,5-bis(4-methoxyphenyl)-4-amino-1,2,4-triazole (4-MAT).     

Corrosion inhibition of mild steel in hydrochloric acid solution by Schiff base furoin thiosemicarbazone

A heterocyclic Schiff base furoin thiosemicarbazone was tested for its corrosion inhibition towards mild steel in 1 M HCl solution using weight loss, Tafel polarization and electrochemical impedance spectroscopy techniques. Furoin thiosemicarbazone revealed good corrosion inhibition efficiency even at low concentrations towards mild steel in HCl medium. Comparison of corrosion inhibition efficiency of Schiff base and its parent amine and effect of temperature on inhibition efficiency were also investigated. The adsorption of furoin thiosemicarbazone on mild steel surface obeys Langmuir isotherm.     

Effect of Schiff base as corrosion inhibitor on AZ31 magnesium alloy in hydrochloric acid solution

Schiff base derived from the condensation reaction of analar grade 1-amino-2-naphthol 4-sulphonic acid with cinnamaldehyde was prepared under microwave condition. The Schiff base was analysed by infrared spectroscopy. This Schiff base as a corrosion inhibitor of AZ31 magnesium alloy in 0.05 mol/L HCl solution was studied. The inhibition effect of the Schiff base compound (4Z)-4-(3-phenyl allylidene amino)-3-hydroxy naphthalene-1-sulfonic acid (AC) on AZ31 magnesium alloy corrosion was studied using mass loss, potentiodynamic polarization technique, electrochemical impedance spectroscopy methods. The potentiodynamic polarization curve shows that Schiff base AC inhibits both anodic and cathodic reactions at all concentration, which indicates it is a mixed type inhibitor. EIS results indicate that as the additive concentration is increased, the polarization resistance increases whereas double-layer capacitance decreases. The adsorption of AC on the AZ31 magnesium alloy surface in 0.05 mol/L HCl obeys the Langmuir adsorption isotherm.     

3,5-Diaryl-4-amino-1,2,4-triazole derivatives as effective corrosion inhibitors for mild steel in hydrochloric acid solution: Correlation between anti-corrosion activity and chemical structure

Protection of Metals and Physical Chemistry of Surfaces - The corrosion inhibition efficiency of newly synthesized 3,5-diaryl-4-amino-1,2,4-triazole derivatives was investigated for mild steel...     

Investigation of the inhibition effect of 5-((E)-4-phenylbuta-1,3-dienylideneamino)-1,3,4-thiadiazole-2-thiol Schiff base on mild steel corrosion in hydrochloric acid

The inhibition effect of 5-((E)-4-phenylbuta-1,3-dienylideneamino)-1,3,4-thiadiazole-2-thiol (PDTT) Schiff base on mild steel corrosion in 0.5 M HCl was studied for both short and long immersion time. For this purpose, potentiodynamic polarization, electrochemical impedance spectroscopy, linear polarization resistance, hydrogen gas evolution, the change of open circuit potential as a function of immersion time, SEM and AFM techniques were utilized. The PDTT Schiff base has shown remarkable inhibition on the corrosion of mild steel in 0.5 M HCl solution. The high inhibition efficiency was attributed to the blocking of active sites by adsorption of inhibitor molecules on the steel surface.     

盐酸介质中3,5-二（2-噻吩基）-1,2,4-三唑(2-TAT)对紫铜的缓蚀作用

    采用动电位极化曲线和电化学阻抗谱技术研究了3,5-二（2-噻吩基）-1,2,4-三唑(2-TAT)在1mol/L HCl介质中对紫铜的缓蚀作用.结果表明,2-TAT为阴极型缓蚀剂,阻抗参数的变化表明2-TAT吸附在紫铜表面,形成保护膜,其吸附方式遵循Langmuir吸附等温式.     

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。     

Study of the mechanism and inhibiting efficiency of 3,5-bis(4-methylthiophenyl)-4H-1,2,4-triazole on mild steel corrosion in acidic media

The efficiency of a new triazole derivative, namely, 3,5-bis(4-methylthiophenyl)-4H-1,2,4-triazole (4-MTHT) has been studied for corrosion inhibition of mild steel in 1 M hydrochloric acid (HCl) and 0.5 M sulphuric acid (H₂SO₄). Corrosion inhibition was studied using electrochemical methods and weight loss measurements. These studies have shown that 4-MTHT was a very good inhibitor. 4-MTHT behaved better in 1 M HCl than in 0.5 M H₂SO₄ and inhibition efficiencies up to 99% and 80% can be obtained in 1 M HCl and 0.5 M H₂SO₄, respectively. Activation energies (E_a) in the presence and absence of 4-MTHT were obtained by measuring the temperature independence of the corrosion current. The potential of zero charge of mild steel was studied by ac impedance method, and the mechanism of adsorption has been discussed. The adsorption of 4-MTHT followed Langmuir's adsorption isotherm in both acids.     

席夫碱对20#碳钢在盐酸介质中的缓蚀作用

分别采用失重法和电化学方法测定了席夫碱试剂4-羟基-3-甲氧基苯甲醛缩-4-烯丙基-3-硫代氨基脲(以下简称AAT),和苯甲醛缩-4-烯丙基-3-硫代氨基脲在盐酸介质中对20#碳钢的缓蚀作用。研究了浓度、温度等因素对这两种缓蚀剂缓蚀性能的影响。结果表明,两种席夫碱试剂在盐酸介质中对20#碳钢均有缓蚀作用,其中AAT的缓蚀性能较优,并发现AAT与乌洛托品、碘化钾、苯甲醛缩-4-烯丙基-3-硫代氨基脲、N-苯甲酰基硫脲等有很好的协同作用。     

Electrosynthesis of adherent poly(3-amino-1,2,4-triazole) films on brass prepared in nonaqueous solvents

The kinetics of the electropolymerization of 3-amino-1,2,4-triazole on a brass substrate in alkaline solution containing methanol was investigated using cyclic polarization, chronoamperometry, electrochemical impedance techniques and scanning electronic microscopy. The polymeric film was prepared by successive cycles of potential of a 60Cu–Zn electrode between 0 and 1.6 V. During the second cycle, the oxidation peak of the monomer disappears indicating the formation of the insulating film. We have also shown that the monomer oxidation reaction is essentially irreversible and controlled by a diffusion process. The protective effect of the film formed on brass has been studied in a 3%NaCl and 3%NaCl + S^2? solution. The results showed important inhibition efficiency, about 96% for 4 h of testing time.