酸性介质中N,N′-双(2-亚甲基吡啶)-1,2-亚氨基乙烷对AZ91D镁合金的腐蚀抑制作用(英文)

采用电化学方法研究N,N′-双(2-亚甲基吡啶)-1,2-亚氨基乙烷(BPIE)Schiff碱在0.010 mol/L HCl溶液中对AZ91D镁合金的腐蚀抑制作用。动电位极化曲线表明,BPIE Schiff碱是一种混合型缓蚀剂。电化学阻抗谱(EIS)测量证实了BPIE的腐蚀抑制作用。随着缓蚀剂浓度的增加,由于有更多的缓蚀剂吸附在AZ91D镁合金表面,电荷转移阻力减小,双电层电容减小。电化学噪声(EN)分析获得的数据在时间和频率域与EIS和极化曲线所得结果表现出良好的一致性。采用扫描电子显微镜(SEM)、X射线衍射(XRD)和能量色散X射线(EDX),研究BPIE的缓蚀作用。SEM照片显示,在存在BPIE的情况下,AZ91D合金表面的腐蚀损伤得到减轻。XRD分析显示,在存在BPIE的情况下,对应于富镁α相的谱峰强度增大,表明合金样品的腐蚀程度低。EDX分析也证实了BPIE的缓蚀作用。此Schiff碱化合物通过物理吸附在合金表面,吸附行为遵循Langmuir等温吸附模型。     

新型希夫碱酸化缓蚀剂的合成及性能评价

以苯胺和芳香醛为原料,通过Schiff反应合成了一种新型希夫碱酸化缓蚀剂ACR-1。采用静态失重法研究了盐酸浓度、腐蚀温度和缓蚀剂浓度对该缓蚀剂缓蚀效果的影响,并对该缓蚀剂在钢片表面的吸附模型进行了探讨;通过电化学法研究了该缓蚀剂的电化学机理。静态挂片失重法表明,腐蚀温度为90℃,腐蚀时间为4h,在ACR-1浓度为1.0%的15%盐酸溶液中,N80钢片的腐蚀速率为1.6733g.m-2.h-1,完全可以满足石油行业标准SY/T 5405-1996一级缓蚀剂产品的指标(3～4g.m-2.h-1);等温吸附行为研究结果表明,该缓蚀剂分子能自发的吸附在N80钢表面上,其在N80钢表面的吸附符合Langmuir单分子吸附模型;电化学法研究表明,ACR-1是一种以抑制阳极反应过程为主的混合型缓蚀剂,属于"几何覆盖效应"模型,并且可以在N80试片表面形成明显的保护性膜层,有效地抑制了试片在酸液中的腐蚀。     

一种双缩水合肼Schiff碱的合成及其酸化缓蚀性能

以水合肼和肉桂醛为原料合成了一种新型Schiff碱酸化缓蚀剂(DCH),用红外光谱法(FI-RT)、化学元素分析法和核磁共振法对其结构进行表征;通过静态失重法和电化学方法考察了其在15%(质量分数,下同)HCl中对N80钢的缓蚀作用。结果表明:DCH是一种混合型酸化缓蚀剂,可在N80钢表面形成保护膜,有效抑制酸液的腐蚀;当DCH加入量为0.75%时,N80钢的腐蚀速率为2.27g·m~(-2)·h~(-1),缓蚀率高达99.81%;DCH在N80钢表面的吸附规律符合Langmuir吸附模型。     

曼尼希碱缓蚀剂CJ的合成及其性能

曼尼希碱是一类重要的金属缓蚀剂。以肉桂醛、环己酮、水合肼为原料合成曼尼希碱缓蚀剂CJ,采用正交试验优化得出最佳合成条件,同时采用极化曲线和电化学阻抗谱等电化学方法研究了曼尼希碱缓蚀剂CJ的缓蚀机理。结果表明:当肉桂醛/水合肼摩尔比为3∶1、环己酮/水合肼摩尔比为1∶1、反应温度为45℃、pH为4、反应时间为8h时,CJ具有最好的缓蚀性能。在15%盐酸中,当缓蚀剂加量为1.0%时,N80钢片的腐蚀速率为0.299 1g/(m2·h),远低于SY/T 5405-1996中的一级标准。曼尼希碱缓蚀剂CJ在钢铁表面的吸附符合Langmuir吸附等温方程;曼尼希碱缓蚀剂CJ是以抑制阳极腐蚀过程为主的混合型缓蚀剂。     

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。     

双缩乙二胺Schiff碱的合成及其酸化缓蚀性能

以乙二胺和芳香醛为原料合成了乙二胺双缩肉桂醛(NDCE)、乙二胺双缩苯甲醛(NDBE)、乙二胺双缩水杨醛(NDSE)和乙二胺双缩对二甲胺基苯甲醛(NDDE)四种双缩Schiff碱缓蚀剂,用元素分析和红外分析对其结构进行了表征,并采用静态失重法和电化学法研究了90℃时它们在15%(质量分数,下同)HCl中对N80钢的缓蚀性能。结果表明:NDCE的缓蚀效果最好,当NDCE的加量为0.75%时,缓蚀率达到99.17%,且NDCE在N80钢片表面的吸附行为符合Langmuir吸附等温模型;NDCE是一种混合型酸化缓蚀剂,在N80钢表面形成了一层保护膜,有效抑制了酸液对N80钢的腐蚀。     

塔河油田单井注采交替缓蚀剂的筛选与复配研究

目的有效治理注采交替工况对井下管柱造成的严重腐蚀,促进缓蚀剂技术在塔河油田的广泛应用。方法采用红外光谱法验证了四种有机缓蚀剂的主要成分,测试了缓蚀剂的理化性能,采用失重法评价了缓蚀剂在塔河油田井下注采交替工况的缓蚀效率,并利用电化学方法研究了两种缓蚀剂的复配性能。结果四种缓蚀剂的有效成分分别为油酸酰胺、芳香酮曼尼希碱、油酸咪唑啉和苄基喹啉盐,理化性能测试全部通过。其中,芳香酮曼尼希碱和油酸咪唑啉在井下注采交替工况下具有良好的缓蚀性能,缓蚀效率分别达到73%和67%。油酸咪唑啉和芳香酮曼尼希碱的复配能进一步提升缓蚀效率,当芳香酮曼尼希碱和油酸咪唑啉的质量比为1:3时,复配缓蚀剂的缓蚀效率能达到90%。结论芳香酮曼尼希碱-油酸咪唑啉复配型缓蚀剂是一种适用于塔河油田注采交替工况的缓蚀剂。     

合成缓蚀剂主剂Mannich碱的方法改进

以甲醛、环己胺、苯乙酮为主要原料,利用Mannich反应合成Mannich碱,考察了原料配比对Mannich碱缓蚀剂的缓蚀性能的影响,确定了Mannich碱的优化合成工艺。当甲醛、环己胺和苯乙酮的物质的量之比为3∶2∶3时,Mannich碱缓蚀剂的缓蚀效果最好。在60℃20%的盐酸中,Mannich碱用量为1.0%时,钢片腐蚀速率为0.36 g.m-2.h-1,在90℃20%的盐酸中,Mannich碱用量为2.0%时,钢片腐蚀速率为1.2 g.m-2.h-1。     

油井酸化缓蚀剂的开发研究进展

综述了曼尼希碱型、季铵盐型、希夫碱型、复配型及其他类型油井酸化缓蚀剂的开发最新研究进展,指出研究开发低毒高效、抗高温高压及耐高浓度酸的酸化缓蚀剂将是今后研究的重点,并展望了未来原料来源丰富、安全环保、新型高效、多功能的绿色酸化缓蚀剂的发展趋势。     

芳香希夫碱在油田采出水中的缓蚀性能研究

目的研究不同复配型芳香希夫碱缓蚀剂在油田采出水中对N80碳钢的缓蚀效果。方法采用静态失重和旋转挂片实验比较四种芳香希夫碱的缓蚀速率,采用电化学测试、扫描电镜和EDS手段对N80碳钢进行表征和分析。结果在油田采出水中添加芳香希夫碱复配型缓蚀剂后,试样表面生成以铁、碳、氧元素为主的保护膜,当四种缓蚀剂的添加量达到90 mg/L时,N80碳钢的腐蚀速率下降趋势变化缓慢,a型缓蚀剂的缓蚀效果最好,其用量为90 mg/L时,N80碳钢的腐蚀速率降低到0.0087 mm/a,自腐蚀电位由-0.8112V提高到-0.7345 V,自腐蚀电流由77.79μA下降到5.410μA,缓蚀率可达到93.05%。结论四种希夫碱复配缓蚀剂均有较好的缓蚀性能,缓蚀剂的缓蚀效果顺序为abdc。     

席夫碱缓蚀剂的研究进展

席夫碱主要指含有亚胺或甲亚胺特征基团 (—RC=N—) 的一类有机化合物。目前席夫碱缓蚀剂具有良好的应用前景,被广泛地应用于工业生产中。本文介绍了近年来国内外席夫碱缓蚀剂的发展概况,阐述了席夫碱缓蚀剂的制备方法及作用机理,并对席夫碱缓蚀剂的发展趋势进行了展望。     

Corrosion inhibition efficiency and surface activity of benzothiazol-3-ium cationic Schiff base derivatives in hydrochloric acid

Two series of cationic Schiff base surfactants namely: 2-(benzylideneamino)-3-(2-oxo-2-alkoxyethyl)-1,3-benzothiazol-3-ium bromide and 2-[(4-methoxybenzylidene)amino]-3-(2-oxo-2-alkoxyethyl)-1,3-benzothiazol-3-ium bromide were prepared and confirmed using elemental analysis, FTIR, and ¹H NMR spectra. The surface activity of the synthesized Schiff bases showed their tendency towards adsorption at the interfaces. The prepared compounds were evaluated as corrosion inhibitors for carbon steel in 0.5 M HCl solution using gravimetric and polarization measurements. By fitting the gravimetric data, some thermodynamic and kinetic parameters were estimated. The adsorption of the inhibitors on the carbon steel surface obeyed Langmuir adsorption isotherm and had a physical mechanism. Polarization measurements showed that the synthesized inhibitors act as mixed inhibitors for carbon steel in the acidic media. The results of the corrosion inhibition using two different methods showed narrow differences in the obtained values between the two methods within 5%.     

Synthesis,characterization and electrical conductivity of a novel conjugated Schiff base macrocycle containing 1,3,4-oxadiazole ring

A new conjugated Schiff base macrocycle containing 1,3,4-oxadiazole ring was prepared by elimination of a tosyl group from a sulfonamide under basic conditions. This synthetic method will provide access to a wide variety of novel conjugated Schiff base macrocycles. The reaction mechanism was examined. The macrocycle has a highly conjugated ring structure and high thermal stability and was doped with iodine to form a stable conducting complex with a conductivity of 10⁻² S/cm. It can be used as semiconductive material.     

An investigation of chloride-substituted Schiff bases as corrosion inhibitors for steel

Polarization and impedance measurements were performed on steel in deaerated 5% HCl solution with and without Schiff base additives within the concentration range 1 × 10⁻⁴–5 × 10⁻³ mol/dm³. The Schiff base compounds used were salicylaldimine, R, N-(2-chlorophenyl)salicyaldimine, 2Cl-R, N-(3-chlorophenyl)salicyaldimine, 3Cl-R, and N-(4-chlorophenyl)salicyaldimine, 4Cl-R. It was found that when the concentration of the inhibitors were increased the inhibitor efficiencies, η, also increased with increasing surface coverage. The results indicated that the ortho-substituted (2Cl-R) compound had the highest inhibition efficiency. All the Schiff base additives studied obeyed the Langmuir isotherm.     

席夫碱基季铵盐型双子表面活性剂对碱性锌电极电化学性能的影响

目的选择席夫碱基季铵盐型双子表面活性剂作为电解液添加剂,改善碱性锌电极的电化学性能,提高其耐蚀性能。方法通过电化学分析法,如失重法、塔菲尔极化曲线法、交流阻抗法等分析研究三种席夫碱基季铵盐型双子表面活性剂(D1、D2、D3)对锌电极电化学性能的影响,利用X射线光电子能谱(XPS)和扫描电子显微镜(SEM)研究在6 mol/L KOH电解液(饱和ZnO)浸泡48 h后,锌片表面的成分和形貌。结果室温下,缓蚀率随席夫碱基季铵盐型表面活性剂浓度升高而增加,当浓度进一步增大,缓蚀率变化不大。三种席夫碱基表面活性剂中,D3缓蚀能力最强,缓蚀率最高达95.67%,抑制腐蚀的效果顺序为:D3D2D1,属于抑制阳极型缓蚀剂。结论 D1、D2、D3作为碱性锌电极的电解液添加剂,可以有效减缓锌电极的腐蚀、变形、钝化及枝晶形成的能力,改善了碱性锌电极的电化学性能,D1、D2、D3适合作为碱性锌电池的缓蚀添加剂。     

席夫碱与硝酸铈复配物对1060纯铝的缓蚀作用

采用极化曲线、电化学阻抗谱、扫描电镜和能谱分析,研究合成的3-吡啶-4-氨基-1,2,4-三唑-5-硫酮席夫碱及其复配物硝酸铈在质量分数为3.5%NaCl溶液中对1060纯铝的缓蚀作用。结果表明：在293 K时席夫碱可有效抑制纯铝在3.5%NaCl溶液中的腐蚀,当席夫碱浓度为0.4 g.L_-1时缓蚀率最高,可达76.0%。席夫碱为混合型缓蚀剂,其在1060纯铝表面的吸附符合Langmuir吸附模型,且同时存在物理吸附和化学吸附。0.2 g.L_-1席夫碱与0.03 g.L_-1硝酸铈复配缓蚀率可达88.2%,二者具有协同缓蚀作用。     

Diphenolic Schiff bases as corrosion inhibitors for aluminium in 0.1 M HCl: Potentiodynamic polarisation and EQCM investigations

The effects of novel synthesised two Schiff bases on the corrosion of aluminium in 0.1 M HCl were investigated using potentiodynamic polarisation and electrochemical quartz crystal microbalance measurements. Results show that inhibition efficiencies increase with increase in inhibitor concentration. This reveals that the inhibition occurs through adsorption of the inhibitor molecules on the metal surface. Adsorption of these inhibitors follows Temkin adsorption isotherm. The correlation between the inhibitor performances and their molecular structures has been investigated using quantum chemical parameters obtained by MNDO (modified neglect of diatomic overlap) semi-empirical method. Calculated quantum chemical parameters indicate that Schiff bases adsorbed on aluminium surface by chemical mechanism.     

Adsorption behaviour of Schiff base and corrosion protection of resulting films to copper substrate

Self-assembled (SA) films of Schiff base were prepared on the copper surface. The corrosion protection abilities of SA films in chloride solution were evaluated using electrochemical impedance spectroscopy and polarization curves. A subsequent adsorption of 1-dodecanethiol on the original SA films of Schiff base improved significantly the protection ability to the copper substrate. The behavior of Schiff base adsorption on copper surface and subsequent adsorption of 1-dodecanethiol was probed by X-ray photoelectron spectroscopy. It was found that copper exists mainly in Cu(I) state in the SA films of Schiff base, and the thiol molecules subsequently adsorbed was bonded directly on copper surface rather than physisorbed on the previous SA films.     

Novel isoxazolium cationic Schiff base compounds as corrosion inhibitors for carbon steel in hydrochloric acid

The corrosion of carbon steel in 0.5 M HCl at 25 °C was investigated in the presence of two synthesized quaternary isoxazolium Schiff base series using gravimetric, polarization and electrochemical impedance measurements. The measurements showed a gradual increase in the inhibitors efficiencies by increasing the dose and hydrophobic chain length. The calculated activation energies proposed that the inhibitor molecules are adsorbed physically onto the metal surface. Surface activity-inhibition tendency relation showed the gradual increase of the inhibition efficiency by increasing the hydrophobic chain length.