双咪唑啉衍生物缓蚀剂的合成与缓蚀研究

以二乙撑三胺和己二腈原料合成了双咪唑啉BM,采用了失重法和极化曲线研究了合成物质对A3钢的缓蚀性能。失重实验表明BM是一种良好的缓蚀剂,25℃,在1mol·L^-1 HCl中,缓蚀剂浓度1mmol·L^-1时,对A3钢的缓蚀率达到96.7％,在0.5mol·L^-1 H2SO4体系中,当缓蚀剂用量为2mmol·L^-1时,缓蚀率为86％。通过模型拟合表明BM符合EL-Awady吸附。极化曲线表明其是一种阴极型缓蚀剂。     

循环冷却水处理技术的试验研究

针对秦岭发电有限公司循环冷却水水质特点,提出采用阻垢缓蚀剂-H2SO4-高效缓蚀剂SW-127联合加药处理方案.静态腐蚀试验确定最佳方案为缓蚀阻垢剂(60mg·L-1)+H2SO4(JD调至2.45mmol·L-1)+高效缓蚀剂(10mg· L-1),循环水的浓缩倍率从2.0倍可提高到4.76倍,碳钢和黄铜的平均腐蚀速...     

水葫芦叶提取物对冷轧钢在H_2SO_4溶液中的缓蚀作用

采用失重法研究了水葫芦(Eichhornia Crassipes)叶提取物(ECLE)对冷轧钢在0.1~0.5 mol/L H_2SO_4溶液中的缓蚀性能。结果表明:ECLE对冷轧钢在0.1 mol/L H2SO4溶液中具有良好的缓蚀作用,缓蚀率随缓蚀剂浓度的增加而增大。各温度下的缓蚀率大致排序为:40℃30℃50℃25℃。ECLE在钢表面的吸附符合Langmuir吸附等温式,其吸附过程为含有物理吸附和化学吸附的混合吸附过程。冷轧钢在添加ECLE前、后的H2SO4溶液中的腐蚀速率随酸浓度的变化均符合Mathur经验公式;添加ECLE后腐蚀速率常数降低,但腐蚀反应动力学参数升高。     

钓鱼慈竹竹叶提取物在H_2SO_4中对钢的缓蚀作用

钓鱼慈竹(Neosinocalamus affinis)竹叶提取物可作为一种环境友好型植物缓蚀剂。采用失重法和动电位极化曲线研究了钓鱼慈竹竹叶提取物在0.5mol/L H2SO4溶液中对冷轧钢的缓蚀作用。结果表明:钓鱼慈竹竹叶提取物具有良好的缓蚀作用,为混合抑制型缓蚀剂,且在钢表面的吸附符合Langmuir吸附等温式。通过van’t Hoff方程和Arrhenius公式求出了吸附热ΔHads和表观活化能Ea,并据此讨论了缓蚀作用机理。     

钼酸盐和钨酸盐在HCl中对冷轧钢的缓蚀作用

用失重法和动电位极化曲线法研究了在0．2mol／L HCl介质中,钼酸钠（Na2MoO4）、钨酸钠（Na2WO4）对冷轧钢片的吸附及其缓蚀作用。实验结果表明,在酸性溶液中,钼酸盐、钨酸盐均对冷轧钢片具有较好的缓蚀作用,而且用量很低。缓蚀剂在钢表面的吸附符合Langmuir吸附方程。在相同条件下,对比了钼酸钠、钨酸钠对冷轧钢的缓蚀作用,发现缓蚀率取决于缓蚀剂的质量浓度,当缓蚀剂浓度极低时缓蚀率排序为：钼酸钠〈钨酸钠,但在较大缓蚀剂质量浓度范围内钼酸钠表现出优越的缓蚀性能。动电位极化曲线表明,钼酸盐、钨酸盐在HCl中为混合抑制型缓蚀剂。     

盐酸介质中聚醚改性七甲基三硅氧烷对碳钢的缓蚀研究

本文研究了三种聚醚改性七甲基三硅氧烷(分别简称为TEO-13、TEO-23和TEO-29)的缓蚀性能.通过静态失重筛选出缓蚀效果较好的聚醚硅氧烷,利用动电位扫描极化曲线及SEM考察了最优化的聚醚硅氧烷在1.0mol· L-1盐酸中对20#碳钢的缓蚀效果,并对缓蚀机理进行了探讨.结果表明:合成的聚醚改性七甲基三硅氧烷对碳钢在HCl介质中表现出优异的缓蚀效果,其中TEO-23的缓蚀效果最好,当达到0.9g·L-1的浓度时,腐蚀速度降为5.9g· (m2·h)-1,缓蚀效率为94.1％.扫描电镜显示TEO-23可在碳钢表面形成致密完整的吸附保护膜,阻碍碳钢的腐蚀.极化曲线表明,该表面活性剂属于阴极型缓蚀剂.     

从富硒茶叶中提取碳钢酸洗缓蚀剂

采用水浸提取法制备含有富硒茶叶提取物(SeTE)的溶液.通过失重法、电化学法研究了在1 mol·L-1 HCl溶液中加入SeTE后碳钢材料的腐蚀规律,分析SeTE的缓蚀效率和缓蚀机理.研究表明:25℃时,当干富硒茶叶与1 mol·L-1 HCl溶液的质量体积比为20 g·L-1时,SeTE的缓蚀效率达到96％.SeTE...     

邻甲苯磺酰胺三元复配缓蚀剂的缓蚀性能研究

为了研制出用量少、效率高的低毒高效缓蚀剂,采用失重法、电化学和扫描电镜(SEM)研究了邻甲苯磺酰胺(OTS)、碘化钾(KI)和十六烷基三甲基溴化铵(CTAB)复配的三元缓蚀剂在0.5 mol·L^-1硫酸溶液中的缓蚀作用。通过正交试验得到三元缓蚀剂最优浓度比为OTS∶KI∶CTAB=15∶6∶5,总浓度130 mg·L^-1时,缓蚀率可达98.18%。添加三元缓蚀剂后腐蚀过程的活化能增大,说明腐蚀反应更难发生。三元缓蚀剂符合Langmuir吸附等温式,在碳钢表面的吸附为自发的弱化学吸附过程。极化曲线法和电化学阻抗法(EIS)计算的缓蚀率均与失重法一致。极化曲线表明三元缓蚀剂是以抑制阳极反应为主的混合型缓蚀剂。SEM微观相貌可看出添加三元缓蚀剂后,碳钢表面几乎无腐蚀痕迹,说明三元缓蚀剂分子之间具有缓蚀协同作用,形成了致密牢固的保护膜。     

在盐酸溶液中[HMIM]BF_4对70高碳钢的缓蚀作用和吸附行为

合成了咪唑类离子液体1-己基-3-甲基咪唑四氟硼酸盐([HMIM]BF_4),采用失重法与电化学方法研究了在1 mol/L HCl溶液中对高碳钢(70钢)的缓蚀性能、吸附行为及缓蚀机理。结果表明,[HMIM]BF_4具有明显的缓蚀作用,属于混合型缓蚀剂,缓蚀效率随着浓度的增加而增大,随着温度升高而下降。该离子液体在碳钢表面的吸附反应为自发放热过程,且该吸附符合Langmuir吸附等温式,属于同时具有物理吸附和化学吸附的混合吸附。     

N,N ''-二(4,6-二氨基酸基-1,3,5-三嗪基)-己二胺的合成及缓蚀性能

以三聚氯氰为母体，接入氨基酸（2-氨基乙酸、3氨基丙酸、4-氨基丁酸、6-氨基己酸）和1,6-己二胺,设计合成4种缓蚀剂：N,N''-二[4,6-二(2-氨基乙酸基)-1,3,5-三嗪基]-己二胺（TFYJ）、N,N '' -二[4,6-二（3-氨基丙酸基）-1,3,5-三嗪基）]-己二胺（TFBJ）、N,N '' -二[4,6-二（4-氨基丁酸基）-1,3,5-三嗪基]-己二胺（TFDJ）、N,N '' -二[4,6-二（6-氨基己酸基）-1,3,5-三嗪基）]-己二胺（TFJJ）。利用FT-IR、1H NMR、MS对其结构进行了表征。通过静态失重法、电化学法测试了45#碳钢在1 mol/L HCl中的缓蚀性能，分析了缓蚀机理。结果表明，4种目标缓蚀剂在1 mol/L HCl中对45#碳钢表现出优异的缓蚀效果。20 ℃下，质量浓度为100 mg/L的TFJJ缓蚀效率达到了98.37%（失重法）。Tafel曲线显示是以阴极为主的混合型缓蚀剂。吸附热力学显示TFJJ符合Langmuir等温吸附方程，是以化学吸附为主、自发的吸附过程。量化计算得到了TFJJ分子的最高被占据轨道能量（EHOMO）、最低空轨道能量（ELUMO）、Fukui指数等，证明TFJJ的缓蚀作用发生在三嗪环和氨基上的N原子，羧酸基团上的C、O原子上。与市售NUEF485相比，合成的产品缓蚀率提高了5.25 %~9.44 %，在600 mg/L的硬水下，依然具有良好的耐硬水性。     

Influence of 2,5-bis(4-dimethylaminophenyl)-1,3,4-thiadiazole on corrosion inhibition of mild steel in acidic media

An example of a new class of corrosion inhibitors, namely, 2,5-bis(4-dimethylaminophenyl)-1,3,4-thiadiazole (DAPT) was synthesized and its inhibiting action on the corrosion of mild steel in 1 M HCl and 0.5 M H₂SO₄ at 30 °C was investigated by various corrosion monitoring techniques. A preliminary screening of the inhibition efficiency was carried out using weight loss measurements. At constant acid concentration, inhibitor efficiency increases with concentration of DAPT and is found to be more efficient in 0.5 M H₂SO₄ than in 1 M HCl. Potentiostatic polarization studies showed that DAPT is a mixed-type inhibitor. The effect of temperature on the corrosion behaviour of mild steel in 1 M HCl with addition of DAPT was studied in the temperature range from 25 to 60 °C. Its was shown that adsorption is consistent with the Langmuir isotherm for 30 °C. The negative free energy of adsorption in the presence of DAPT suggests chemisorption of thiadiazole molecules on the steel surface.     

Inhibiting and accelerating effects of aminophenols on the corrosion and permeation of hydrogen through mild steel in acidic solutions

The influence of aminophenols on the corrosion and hydrogen permeation of mild steel in 1 M HCl and 0.5 M H₂SO₄ has been studied using weight loss and gasometric measurements and various electrochemical techniques. All the isomers of aminophenol inhibit the corrosion of mild steel in 1 M HC1 and accelerate it in 0.5 M H₂SO₄. They behave predominantly as cathodic inhibitors. Aminophenols, except PAP in I M HCI, enhance the permeation current in both the acids. The adsorption of PAP on the mild steel surface in 1 M HCl obeys the Langmuir adsorption isotherm. Surface analysis and ultraviolet spectral studies are also carried out to establish the mechanism of corrosion inhibition and acceleration of mild steel in acidic solutions.     

Surface protection of mild steel using benzimidazole derivatives: experimental and theoretical approach

Interaction of organic molecules with the surface of metals plays important role in many applications. In particular, surface protective applications need much explanation from both experimental and theoretical point of view. Herein, we have investigated the surface adsorption characteristics and corrosion inhibition behavior of two new benzimidazole derivatives namely 2-(2-Bromophenyl)-1H-benzimidazole (BPBA) and 2-(2-Bromophenyl)-1-methyl-1H-benzimidazole (BPMA) on mild steel in 0.5?M?HCl solution using experimental and theoretical approach. Electrochemical and weight loss experiments were used to elucidate the corrosion inhibition potentials of BPBA and BPMA. Attenuated total reflectance-Fourier transform infrared spectroscopy, contact angle, scanning electron microscopy, and X-ray photoelectron spectroscopy measurements were performed to confirm the adsorption of BPBA and BPMA on mild steel surface. Computer simulations were further employed to provide additional insights into the mechanism of interaction between the inhibitors and the steel surface. All the results confirmed that BPMA is a better corrosion inhibitor for mild steel than BPBA in 0.5?M HCl. This new inhibitors could find application industrially during processes such as oil well acidizing for steel protection against corrosion.     

Influence of tramadol [2-[(dimethylamino)methyl]-1-(3-methoxyphenyl) cyclohexanol hydrate] on corrosion inhibition of mild steel in acidic media

Tramadol[2-[(dimethylamino)methyl]-1-(3-methoxyphenyl)cyclohexanol hydrate], a drug, was tested as a corrosion inhibitor for mild steel in 0.5 M HCl and 0.25 M H₂SO₄ separately at 300, 310 and 320 K using mass loss and galvanostatic polarization techniques. The percentage protection efficiencies were evaluated at different concentrations of the inhibitor at different temperatures. The protection efficiency increased with increase in inhibitor concentration and decreased with increase in temperature in both the acid solutions. Galvanostatic polarization studies showed that the inhibitor is of mixed type with a slight predominance of cathodic character. The inhibitor was more active in HCl than in H₂SO₄. The maximum protection efficiency approached 82.6% in the presence of 2.16 × 10⁻³ M inhibitor. Some samples of mild steel were examined by scanning electron microscopy. The inhibitor was found to adsorb on the mild steel surface according to the Langmuir adsorption isotherm. The thermodynamic functions of dissolution and adsorption processes were evaluated.     

黑液双液法堵剂的研究

本文对黑液在酸的作用下同时生成凝胶和泡沫进行了研究。由于凝胶的沉积作用和泡沫的Jamin效应，使其在采油工艺中能改变非均质地层中的渗透规律，起到堵水作用，是一种新型的双液法堵剂。在25℃条件下将黑液分别用2．5mol·L－1H2SO4、6mol·L－1HCl和CO2进行处理，当pH值分别达到10．16、9．60、10.08时凝胶沉淀完全。实验结果表明，凝胶的粘度为13．2～26．6mPa·s，泡沫的寿命为32～34min。当pH为13．5～13.9时可使凝胶溶解。     

1-(2-Hydroxyethyl)-2-imidazolidinone as corrosion inhibitor of mild steel in 0.5 M HCl solution: thermodynamic,electrochemical and theoretical studies

The inhibition effect of 1-(2-Hydroxyethyl)-2-imidazolidinone (2-HEI) on mild steel (MS) corrosion in 0.5?M HCl solution was investigated at different inhibitor concentration and temperature by electrochemical experiments, such as linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and quantum chemical calculations. The inhibitor adsorption process on mild steel in 0.5?M HCl system was studied at different temperatures (20?°C–50?°C). Furthermore, the surface morphology of MS was also investigated with SEM in the absence and the presence of inhibitor. The adsorption of 1-(2-Hydroxyethyl)-2-imidazolidinone on MS surface is an exothermic process and this process obeys the Langmuir adsorption isotherm. The Quantum chemical findings are good agreed with the empirical data.     

Influence of anions on the performance of isomers of aminobenzoic acid on the corrosion inhibition and hydrogen permeation through mild steel in acidic solutions

The influence of aminobenzoic acids on the corrosion and hydrogen permeation through mild steel in 1 m HC1 and 0.5 M H₂SO₄ has been studied using weight loss and gasometric measurements and various electrochemical techniques. All the three isomers of aminobenzoic acid inhibit the corrosion of mild steel both in HC1 and H₂SO₄ in the order ortho > meta > para. It is observed that the inhibition is greater in HCI than in H₂SO₄. The predominant behaviour is in the cathodic inhibitor mode. These compounds reduce the permeation current in 111 HCl and enhance it in 0.51 v1 H₂SO₄. The adsorption of these compounds on mild steel in 1 m HC1 and 0.5 m H₂SO₄ obeys Langmuir's adsorption isotherm.     

Hyperbranched poly(cyanurateamine): A new corrosion inhibitor for mild steel in hydrochloric acid medium

Hyperbranched poly(cyanurateamine) (POCYAM) was tested as a novel corrosion inhibitor for mild steel in 0.5–3 M HCl using chemical and electrochemical techniques at 25–70 °C. The results show that this compound has good corrosion inhibiting properties for mild steel in HCl at very low concentrations. Corrosion inhibition efficiency rises with POCYAM concentration. The adsorption of the POCYAM onto the mild steel surface obeys Langmuir adsorption isotherm model. The inhibition mechanism was further corroborated by the values of thermodynamic parameters obtained from the experimental data.