柚子皮提取物对热轧碳钢在HCl 溶液中的缓蚀作用研究

采用加热回流萃取法从柚子皮中提取天然缓蚀剂,并采用失重法和极化曲线法测试了提取物在30 ~50 ℃温度范围内,对热轧碳钢在2 mol/ L HCl 介质中的缓蚀性能。失重法测试结果表明,柚子皮提取物对热轧碳钢有良好的缓蚀作用,缓蚀效率随着温度的升高和缓蚀剂浓度的增加而增大,50 ℃时,最大缓蚀效率达到78. 4%。提取物在热轧碳钢表面的吸附作用符合Langmuir 吸附模型,以物理吸附为主。极化曲线测试结果表明,柚子皮提取物主要抑制热轧碳钢腐蚀反应的阴极过程,属于混合型缓蚀剂。     

HCl介质中双季铵盐对碳钢的缓蚀作用

合成了一种双季铵盐缓蚀剂(BQA)，分别用腐蚀失重 法和电化学测试法研究了其在HCl介质中对碳钢的缓蚀作用及缓蚀机理.结果显示，对碳钢 在1.0 mol/L HCl溶液中BQA是一种性能优异的缓蚀剂.     

2-巯基苯并咪唑与L-半胱氨酸在HCl 中对Q235 钢的协同缓蚀效应

目的 探究2-巯基苯并咪唑（MBI）、L-半胱氨酸（L-cysteine）以及两者的混合体系在1 mol/L HCl溶液中对Q235钢的缓蚀性能。方法 通过静态失重法、电化学阻抗谱以及极化曲线研究MBI与L-cysteine的最佳复配条件,并借助原子力显微镜（AFM）以及X射线光电子能谱仪（XPS）分析探究MBI、L-cysteine单独以及复配后在碳钢表面的作用机理。结果 当在HCl溶液中加入5×10?3 mol/L的MBI时,缓蚀效率达到88.01%,而相同浓度下,L-cysteine的缓蚀效率仅达60.19%,缓蚀作用有限。当MBI和L-cysteine复配时,二者的混合体系在HCl介质中具有很好的缓蚀效果,特别是当浓度为1×10?3 mol/L、复配比为9∶1时,缓蚀效果达到最佳,协同效应也最明显。电化学法所得结果和失重法保持一致,且进一步表明MBI和L-cysteine的混合体系同时抑制腐蚀反应的阴、阳极过程,其中抑制阴极的效果最显著。AFM形貌图以及XPS谱图分别表明浸泡在含有MBI-L-cysteine（浓度为1×10?3 mol/L,复配比为9∶1）溶液中的Q235钢表面更加平整,MBI-L-cysteine在Q235钢上通过吸附形成的保护膜可以显著增强Q235钢的耐酸性。结论 MBI与L-cysteine（浓度为1×10?3 mol/L,复配比为9∶1）在1 mol/L HCl溶液中对Q235钢有显著的协同缓蚀性能,但协同效应会随着L-cysteine的增多而逐渐消失。     

酸性介质中壳聚糖磷酸酯对碳钢的缓蚀效能

采用失重法研究了壳聚糖磷酸酯在1mol/L HCl和1mol/L H2SO4中的缓蚀性能,采用极化曲线和电化学阻抗法分析了缓蚀机理,并通过扫描电镜对腐蚀形貌进行了分析。结果表明:壳聚糖磷酸酯在盐酸和硫酸体系中对碳钢腐蚀具有很好的抑制作用,在1mol/L HCl中缓蚀率随浓度增加而升高,在1mol/L H2SO4中缓蚀率先升高后降低;极化曲线表明壳聚糖磷酸酯在酸体系中是以抑制阳极过程为主的缓蚀剂;在碳钢表面发生单分子层吸附。     

含席夫碱结构碳点缓蚀剂的简易可扩展制备及性能研究

目的 克服目前制备碳点(Carbon dots, CDs)缓蚀剂存在的耗时、耗能等缺点，在室温下一步制备含席夫碱结构的CDs缓蚀剂，并研究其对Q235碳钢的缓蚀性能。方法 设计了一种简易、可扩展的制备方法，以邻苯二胺和对苯醌为前驱体，无需高温加热便可在室温下反应2 h，从而获得含席夫碱结构的CDs。利用TEM等方法对其结构进行表征，并采用UV和PL光谱评估其在HCl溶液中的长期分散稳定性。通过失重法、电化学测试方法研究了不同浓度CDs对Q235碳钢在1 mol/L HCl溶中的缓蚀性能。通过SEM和三维轮廓测量仪分析腐蚀后碳钢表面形貌及化学组成，提出CDs的缓蚀机理。结果 CDs含C=N键，具有多种含氧、含氮基团，有利于其在钢表面的吸附。CDs在HCl溶液中具有长期分散稳定性。当添加浓度为200 mg/L时，其对碳钢在1 mol/L HCl溶液中的缓蚀效率可达到95.05%。CDs为混合型缓蚀剂，能够同时抑制阴极和阳极反应。CDs在碳钢表面的吸附方式遵循Langmuir等温吸附模型，其缓蚀机理为通过物理和化学吸附方式在碳钢表面形成一层保护膜，从而抑制碳钢的腐蚀。结论 成功为CDs缓蚀剂的合成提供了一种简易、可扩展、高效、省时的方法，而且证明了具有席夫碱结构的CDs对碳钢在1 mol/L HCl溶液中的腐蚀具有显著的抑制能力。     

樟树叶提取液在硫酸介质中对碳钢的缓蚀作用

应用动电位极化法和电化学阻抗(EIS)研究了樟树叶提取液(CCLE)在硫酸介质中对碳钢的缓蚀性能和缓蚀机理. 结果表明, 采用酸浸泡法从樟树叶中提取的缓蚀剂, 对碳钢在10% H₂SO₄溶液中具有良好的缓蚀作用, 随着提取液浓度的增加, 缓蚀效率增大; 随着实验温度升高, 缓蚀效率减小. 樟树叶提取液为混合抑制型缓蚀剂, 提取液中的有效缓蚀成分在碳钢表面的吸附满足Langmuir等温吸附方程; 樟树叶提取液的加入使碳钢在硫酸中反应的表观活化能增加, 起到缓蚀作用.     

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。     

柚子皮提取物对C38的缓蚀作用

目的研究柚子皮提取物对C38钢在1 mol/L HCl中的缓蚀作用。方法通过索氏提取器从柚子皮中提取天然绿色缓蚀剂,进而与0.01 mol/L KI进行复配,采用失重法和电化学测试法分析柚子皮提取物的缓蚀作用机理。结果失重实验表明,柚子皮提取物对C38钢的缓蚀作用最高达93%,而与0.01mol/L KI复配使用后缓蚀效率最高达98%以上。同时表明其在碳钢表面的吸附符合Langmuir吸附等温式;Tafel极化曲线表明其能同时抑制碳钢腐蚀的阴、阳极过程;碳钢的阻抗值随着柚子皮提取物浓度的增加而增大。结论柚子皮提取物是很好的缓蚀剂,与卤素离子复配后效果更佳。     

Q235钢表面的超疏水吸附层形成与缓蚀研究

用新鲜荷叶作为研究对象,经过简便的乙醇回流萃取取得提取物。室温条件下,荷叶提取物能够在THF/HCl水溶液的混合溶液(体积比为1/1,1.0 mol/L HCl溶液)中产生聚集。傅立叶变换红外光谱以及X射线光电子能谱的结果证明了荷叶提取物在Q235钢样品表面发生化学作用,能够形成超疏水的吸附层。电化学结果表明荷叶提取物对碳钢在HCl溶液中具备良好的缓蚀性能,在0.4 g/L浓度下,最大缓蚀效率达到93.14%。     

胡萝卜茎叶提取物对碳钢在0.5 mol/L H2SO4溶液中的缓蚀作用

目的研究胡萝卜茎叶提取物(DCSLE)在硫酸介质中对碳钢的腐蚀抑制作用及机理。方法通过超声辅助的手段,用水浸提获得DCSLE,利用红外光谱(FTIR)对其含有的主要官能团进行表征。在25~40℃下,采用失重法、电化学极化和阻抗法(EIS)评价DCSLE在0.5 mol/L H2SO4溶液中对碳钢的缓蚀性能,并讨论了其缓蚀机理。结果DCSLE对碳钢在0.5mol/LH2SO4溶液中的腐蚀具有良好的抑制效果,其缓蚀效率随浓度的增加而增加,随温度的增加而先增加后降低(40℃<25℃<30℃<35℃),35℃下,质量浓度为0.6g/L时,缓蚀效率为92.85%。电化学测试表明,DCSLE是混合型缓蚀剂,但主要是抑制阴极的反应。其缓蚀机理是:DCSLE以物理和化学混合吸附的方式吸附在碳钢表面,形成一层保护膜,从而阻止酸溶液的侵蚀,且吸附遵循Langmuir吸附等温模型。扫描电镜(SEM)观察到加入DCSLE后,碳钢的腐蚀得到了明显控制。结论DCSLE可以有效抑制碳钢在0.5mol/LH2SO4溶液介质中的腐蚀,是一种具有广泛应用前景的天然绿色缓蚀剂。     

电化学法研究芭蕉叶提取物在盐酸中对碳钢的缓蚀作用

目的研究芭蕉叶提取物(MBLE)在酸性环境中对碳钢腐蚀的抑制行为。方法通过热水浸提法获取MBLE,采用电化学方法研究在不同实验温度和不同浓度下MBLE在1 mol/L盐酸溶液中对碳钢的缓蚀行为,并用扫描电镜(SEM)研究金属表面腐蚀形貌。结果极化曲线研究表明,MBLE对碳钢在1mol/L盐酸中的腐蚀有明显抑制作用,属阴极抑制为主的混合型缓蚀剂;其缓蚀性能随质量浓度增大而增强,25℃时160 mg/L的MBLE缓蚀效率达到94.7%。电化学阻抗图谱研究表明,随着MBLE质量浓度的增大,碳钢表面腐蚀反应的电荷转移电阻逐渐增大,腐蚀反应抑制程度增强。变温试验研究表明,MBLE在实验温度范围内具有较好的稳定性。当MBLE质量浓度为160 mg/L时,温度从25℃增加到40℃,两种电化学方法所得缓蚀效率的变化幅度均在3%以内。MBLE缓蚀剂分子在碳钢表面的吸附服从Dhar-Flory-Huggins等温吸附式,并且属于物理和化学混合吸附。SEM研究表明,盐酸介质中MBLE可有效地抑制碳钢的腐蚀。结论对碳钢在盐酸介质中的腐蚀,MBLE是有效的绿色缓蚀剂。     

Corrosion inhibition of carbon steel in hydrochloric acid solution using pomegranate leave extracts

The inhibitive action and adsorption behaviour of pomegranate leave extract (PGLE) on corrosion of carbon steel in 1M HCl solution at 293–333?K was investigated through chemical (weight loss measurements), electrochemical (potentiodynamic polarisation) and surface analysis [Fourier transform infrared (FTIR) and X-ray diffraction (XRD)] methods. Results obtained shows that the adsorption of PGLE molecules on the C steel surface obeyed the Langmuir adsorption isotherm and acts as mixed type inhibitor for C steel in 1M HCl with anodic as its dominant inhibitor at high concentration. The inhibitory property of the extract was discussed in terms of the mechanism by which its components adsorb onto the C steel surface. Activation energy of corrosion and other thermodynamic parameters such as standard free energy, standard enthalpy and standard entropy of the adsorption process as well as FTIR and XRD examinations of the electrode surface revealed that the corrosion inhibition of C steel in 1M HCl in the presence of PGLE is mainly controlled by the physical adsorption process.     

Adsorption and Corrosion Inhibition Behavior of Carbon Steel by Cefoperazone as Eco-Friendly Inhibitor in HCl

The inhibition effect of cefoperazone (CP) on the corrosion behavior of carbon steel in 0.5 M HCl solution was studied using potentiodynamic polarization, electrochemical impedance spectroscopy, and electrochemical frequency modulation techniques along with scanning electron microscopy (SEM). Results showed that the inhibition efficiency increases with increasing inhibitor concentration and decreases with increasing the temperature. The results indicated that the inhibitive action of CP can be attributed to its adsorption. The results show that CP possesses excellent inhibiting effect for the corrosion of carbon steel and the inhibitor acts as mixed-type inhibitor. The adsorption process is spontaneous and follows Langmuir adsorption isotherm model. The surface adsorption of the inhibitor molecules decreases the double-layer capacitance and increases the polarization resistance. SEM results indicate the formation of an adsorbed protective film on the metal surface. The results obtained from the different techniques were in good agreement which prove the validity of these tools in the measurements of the tested inhibitor.     

Influence of 2,3-Dihydroxyflavanone on Corrosion Inhibition of Mild Steel in Acidic Medium

The inhibition effect of 2,3-dihydroxyflavone on the corrosion of mild steel in 100-600 ppm aqueous hydrochloric acid solution has been investigated by weight loss and electrochemical impedance spectroscopy. The corrosion inhibition efficiency increases with increasing concentration and time. The effect of temperature on the corrosion behavior of mild steel in 1 M HCl with addition of inhibitor was studied at the temperature range of 300-330 K. UV-Vis, FTIR, and surface analysis (SEM) was also carried out to establish the corrosion inhibitive property of this inhibitor in HCl solution. The adsorption of this inhibitor on the mild steel surface obeys the Langmuir adsorption isotherm. Electrochemical studies reveal that the inhibitor is a cathodic type.     

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．     

Corrosion inhibition of C38 steel in 1 M hydrochloric acid medium by alkaloids extract from Oxandra asbeckii plant

The inhibition effect of alkaloids extract from Oxandra asbeckii plant (OAPE) on the corrosion of C38 steel in 1 M hydrochloric acid solution has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The corrosion inhibition efficiency increases on increasing plant extracts concentration. Cathodic and anodic polarization curves show that OAPE is a mixed-type inhibitor. The effect of temperature on the corrosion behavior of C38 steel in 1 M HCl with and without addition of plant extract was studied in the temperature range 25–55 °C. The thermodynamic functions of dissolution and adsorption processes were calculated from experimental polarization data and the interpretation of the results are given. The adsorption of this plant extract on the C38 steel surface obeys the Langmuir adsorption isotherm. Surface analysis (Raman) was also carried out to establish the corrosion inhibitive property of this plant extract in HCl solution.     

Acid violet 6B as a novel corrosion inhibitor for cold rolled steel in hydrochloric acid solution

The inhibition effect of acid violet 6B (AV6B) on the corrosion of cold rolled steel (CRS) in 1.0–5.0 M HCl solution was studied for the first time by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods. The results show that AV6B is a very good inhibitor in 1.0 M HCl, and the adsorption of AV6B on CRS surface obeys Langmuir adsorption isotherm. Polarization curves reveal that AV6B behaves as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability. Effects of immersion time and acid concentration on inhibition performance were also discussed.     

含咪唑啉磷酸酯的复配缓蚀剂对Q235钢的缓蚀行为研究

将自制咪唑啉磷酸酯盐与KI复配,采用失重法、极化曲线和交流阻抗法研究了该缓蚀剂在1mol/L HCl水溶液中对Q235钢的缓蚀行为,探讨了其在Q235钢表面的吸附行为。结果表明：该缓蚀剂在1mol/L HCl水溶液中对Q235钢为混合偏阴极型缓蚀剂;缓蚀率随缓蚀剂浓度的增大而增加;该缓蚀剂在Q235钢表面的吸附模式遵循Langmuir吸附。     

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。