一种新型含硫曼尼希碱的合成与缓蚀性能研究

由苯甲醛、苯乙酮和氨基硫脲合成曼尼希碱缓蚀剂,通过静态失重实验、动电位极化曲线、交流阻抗等方法评价了其在10%HCl溶液中对N80钢的缓蚀性能。结果表明,在缓蚀剂加量为1%、60℃的10%盐酸溶液中,N80钢片的腐蚀速率为0.627 4 g/(m~2·h);随着温度的升高和盐酸浓度的增加,缓蚀剂的腐蚀速率有所上升,但都在1 g/(m~2·h)以下;缓蚀剂在钢片表面的吸附符合Langmuir吸附等温模型;加入缓蚀剂后,钢片的腐蚀电流密度降低,电荷转移电阻增大,表明该缓蚀剂能有效地抑制N80钢的腐蚀。     

一种新型含硫曼尼希碱的合成与缓蚀性能研究

由苯甲醛、苯乙酮和氨基硫脲合成曼尼希碱缓蚀剂,通过静态失重实验、动电位极化曲线、交流阻抗等方法评价了其在10%HCl溶液中对N80钢的缓蚀性能。结果表明,在缓蚀剂加量为1%、60℃的10%盐酸溶液中,N80钢片的腐蚀速率为0.627 4 g/(m²·h);随着温度的升高和盐酸浓度的增加,缓蚀剂的腐蚀速率有所上升,但都在1 g/(m2·h);随着温度的升高和盐酸浓度的增加,缓蚀剂的腐蚀速率有所上升,但都在1 g/(m²·h)以下;缓蚀剂在钢片表面的吸附符合Langmuir吸附等温模型;加入缓蚀剂后,钢片的腐蚀电流密度降低,电荷转移电阻增大,表明该缓蚀剂能有效地抑制N80钢的腐蚀。     

油田回注水系统管道防腐蚀技术研究

为了处置油田回注水系统管道腐蚀问题,室内研发制备了一种新型油田回注水系统管道缓蚀剂材料,并基于试验研究深入探讨了分散剂材料加量、缓蚀剂加量以及温度对新型缓蚀剂缓蚀性能的影响。研究发现：随着分散剂材料加量的逐渐增大,N80钢片的腐蚀速率逐渐变慢,新型缓蚀剂的缓蚀率逐渐增大。在新型缓蚀剂中掺入一定量的分散剂可以有效提高缓蚀剂的缓蚀性能,当分散剂加量为9%时,缓蚀率已经达到60.00%,继续增加分散剂加量对缓蚀剂的缓蚀性能无明显提升。当向钢片加入的新型缓蚀剂加量为90mg/L时,缓蚀剂整体的缓蚀率最大,为缓蚀剂的最佳加量值点,此时缓蚀率达到67.26%。宏微观形貌图结果表明,添加缓蚀剂后,试片平面逐渐平整,表面形成一层黑色或蓝色的保护膜,该膜吸附较为紧实,从而有效抑制金属的腐蚀。     

一种多元酸化缓蚀剂的制备及其性能研究

由苄基氯化喹啉季铵盐、2-苯甲酰基-3-羟基-1-丙烯、曼尼希碱及平平加复配,得到了一种性能优良的多元酸化缓蚀剂。用静态失重法和电化学方法测试其缓蚀性能,并建立了其在金属表面的吸附模型,采用扫描电镜和电子能谱对试片的表面形貌和元素成分进行分析。结果表明,由喹啉季铵盐5%、2-苯甲酰基-3-羟基-1-丙烯5%、曼尼希碱2%、平平加3%组成的多元缓蚀剂的性能最佳,在缓蚀剂加量1%、90℃的20%盐酸中,N80钢片的腐蚀速率为1.715 2 g/(m~2·h);缓蚀剂在钢片表面的吸附特征符合Langmuir吸附等温模型,吸附焓变以及吸附Gibbs自由能均小于零;在腐蚀介质中加入缓蚀剂后,N80钢片的自腐蚀电位负移,交流阻抗增大,自腐蚀电流减小,阴极和阳极Tafel斜率增大,表明该多元酸化缓蚀剂是以化学吸附为主的混合抑制型缓蚀剂。     

一种多元酸化缓蚀剂的制备及其性能研究

由苄基氯化喹啉季铵盐、2-苯甲酰基-3-羟基-1-丙烯、曼尼希碱及平平加复配,得到了一种性能优良的多元酸化缓蚀剂。用静态失重法和电化学方法测试其缓蚀性能,并建立了其在金属表面的吸附模型,采用扫描电镜和电子能谱对试片的表面形貌和元素成分进行分析。结果表明,由喹啉季铵盐5%、2-苯甲酰基-3-羟基-1-丙烯5%、曼尼希碱2%、平平加3%组成的多元缓蚀剂的性能最佳,在缓蚀剂加量1%、90℃的20%盐酸中,N80钢片的腐蚀速率为1.715 2 g/(m²·h);缓蚀剂在钢片表面的吸附特征符合Langmuir吸附等温模型,吸附焓变以及吸附Gibbs自由能均小于零;在腐蚀介质中加入缓蚀剂后,N80钢片的自腐蚀电位负移,交流阻抗增大,自腐蚀电流减小,阴极和阳极Tafel斜率增大,表明该多元酸化缓蚀剂是以化学吸附为主的混合抑制型缓蚀剂。     

棉籽油咪唑啉缓蚀剂的合成与缓蚀性能研究

利用棉籽油为原料,与三乙烯四胺及氯化苄反应,合成了一种咪唑啉缓蚀剂。采用静态挂片失重法测定了咪唑啉缓蚀剂及其复配体系在盐酸介质中对N80钢的缓蚀效率。结果表明:该咪唑啉缓蚀剂在15%盐酸介质中对N80钢具有较好的缓蚀能力,与KI、OP-10、丙炔醇复配后对抑制N80钢的腐蚀产生很好的协同效果。在实验条件下,该复配物加入丙炔醇的量为0.1%,缓蚀剂为0.3%时,缓蚀效率最高,可达到99.39%。     

一种席夫碱缓蚀剂的制备及性能研究

由肉桂醛和苯胺合成席夫碱缓蚀剂,通过静态失重法、电化学测试法研究了在15%盐酸溶液中,席夫碱缓蚀剂对N80钢的缓蚀性能。结果表明,加入质量分数1.0%的席夫碱缓蚀剂,钢片的腐蚀速率降为1.637 2 g/(m2·h),席夫碱缓蚀剂为阳极抑制型缓蚀剂,能自发吸附在碳钢表面,符合Langmuir吸附等温式。     

一种席夫碱缓蚀剂的制备及性能研究

由肉桂醛和苯胺合成席夫碱缓蚀剂,通过静态失重法、电化学测试法研究了在15%盐酸溶液中,席夫碱缓蚀剂对N80钢的缓蚀性能。结果表明,加入质量分数1.0%的席夫碱缓蚀剂,钢片的腐蚀速率降为1.637 2 g/(m2·h),席夫碱缓蚀剂为阳极抑制型缓蚀剂,能自发吸附在碳钢表面,符合Langmuir吸附等温式。     

盐类浓度对油酸咪唑啉季铵盐缓蚀率的影响

针对油田污水富含钙、镁、钠等盐类的现状,合成了油酸咪唑啉季铵盐,采用电化学极化法和静态失重法测试了其缓蚀性能,并采用电化学极化法考察了强酸腐蚀介质中氯化钙、氯化镁及氯化钠3种盐的浓度对该缓蚀剂缓蚀率的影响。结果表明:该缓蚀剂是一种以阳极抑制为主的混合型缓蚀剂;在1mol·L-1 HCl溶液中,当缓蚀剂浓度为5mg·L-1时,N80钢片的腐蚀速率和缓蚀剂的缓蚀率趋于稳定;随着介质中盐类浓度的增大,缓蚀剂的缓蚀率逐渐减小。分析认为,缓蚀率减小的原因可能是由于介质的电导率增大,导致腐蚀速率加快。     

1-氯代十二烷基复配缓蚀剂对油气输气管道的缓蚀研究

本文参照延安地区油气管道内积水水质,研究了含不同质量浓度CO32-对N80钢的腐蚀行为,着重研究了咪唑的缓蚀性能以及它与表面活性剂1-氯代十二烷的协同效应,所用方法为静态挂片法。结果表明:制备的复配缓蚀剂对N80钢的缓蚀率可达到68.9%以上,对A3钢的缓蚀率都可达到84.5%以上。以0.8%(wt)咪唑和1-氯代十二烷的比例为100:20(V%)时复配的缓蚀剂缓蚀效果最明显,其对N80钢的缓蚀率为81.1%,而对A3钢的缓蚀率都可达到92.2%。SEM结果表明,添加了复配缓蚀剂后,N80钢和A3钢表面腐蚀得到了较好的抑制,裂纹明显降低。     

CHAMOMILE (Matricaria recutita) EXTRACT AS A CORROSION INHIBITOR FOR MILD STEEL IN HYDROCHLORIC ACID SOLUTION

The corrosion inhibition of mild steel in hydrochloric acid solution by chamomile (Matricaria recutita) extract (CE) was investigated through electrochemical (polarization, EIS) and surface analysis (optical microscopy/AFM/SEM) techniques. The effects of inhibitor concentration, temperature, and pH were evaluated. Thermodynamic parameters were calculated and adsorption studies were carried out. Finally, the surface morphology was investigated. The electrochemical studies showed that CE acts as a mixed-type corrosion inhibitor with predominantly anodic behavior. CE was adsorbed physically on the metal surface and obeyed the Langmuir adsorption isotherm. It impeded the corrosion processes by changing the activation energy. In the presence of CE, the metal surface was more uniform than the surface in the absence of inhibitor. Maximum inhibition efficiency (IE) was 93.28%, which was obtained at 22°C in 7.2 g/L of inhibitor in 1 M HCl solution.     

A novel green inhibitor for C-steel corrosion in 2.0 mol·L~(-1) hydrochloric acid solution

The corrosion inhibition characteristics of aqueous extract of seeds of Melia azedarach L.(MA) have been studied as eco-friendly green inhibitor for corrosion control of C-steel in 2 mol·L~(-1) HCl solution by gravimetric and electrochemical methods. The results depict that, the extract inhibits efficiently the corrosion of carbon steel in hydrochloric acid. The efficiency of extract is increased with increasing the extract concentration but independent on the studied temperature. The adsorption of the extract components onto the steel surface was found to be spontaneous, and follows Langmuir adsorption isotherm. The surface morphology of C-steel, in the absence and presence of MA extract in 2.0 mol·L~(-1) hydrochloric acid solution, was studied using scanning electron microscopy(SEM).     

THE EFFECT OF ENVIRONMENTALLY BENIGN FRUIT EXTRACT OF SHAHJAN (MORINGA OLEIFERA) ON THE CORROSION OF MILD STEEL IN HYDROCHLORIC ACID SOLUTION

The inhibition of the corrosion of mild steel in hydrochloric acid solution by the fruit extract of shahjan (Moringa oleifera) was studied using weight loss, electrochemical impedance spectroscopy (EIS), linear polarization, and potentiodynamic polarization techniques (Tafel). Inhibition was found to increase with increasing concentration of the extract. The effect of temperature, immersion time, and acid concentration on the corrosion behavior of mild steel in hydrochloric acid solutions with addition of extract was also studied. The inhibition occurred via adsorption of the inhibitor molecules on the mild steel surface obeying the Langmuir adsorption isotherm. Thermodynamic activation parameters such as activation energy, enthalpy (ΔH*), and entropy (ΔS*) of activation for corrosion process were calculated and discussed. The results obtained show that both chemical and physical adsorption of inhibitor molecules occur simultaneously and the fruit extract of shahjan (Moringa oleifera) could serve as an effective inhibitor of the corrosion of mild steel in hydrochloric acid media.     

THE ROLE OF PHOSPHONATE DERIVATIVES ON THE CORROSION INHIBITION OF STEEL IN HCL MEDIA

The inhibition of corrosion of steel by two P-containing compounds, sodium methyldodecyl phosphonate and sodium methyl (11-smethacryloyloxyundecyl) phosphonate, in hydrochloric acid has been investigated at various temperatures using electrochemical techniques (impedance spectroscopy (EIS), potentiodynamic polarization) and weight loss measurements. Inhibition efficiency (E%) increased with phosphonate concentration. Adsorption of inhibitors on the steel surface in 1 M HCl follows the Langmuir isotherm model. EIS measurements showed that the dissolution process of steel occurred under activation control. Polarization curves indicated that inhibitors tested acted as cathodic inhibitors. The temperature effect on the corrosion behavior of steel in 1 M HCl without and with the inhibitor was studied in the temperature range from 313 to 353 K. The adsorption free energy and activation parameters for the steel dissolution reaction in the presence of phosphonates were determined.     

双咪唑啉缓蚀剂抑制油田CO_2腐蚀的性能研究

以葵二酸、三乙烯四胺和氯化苄为原料,合成了双咪唑啉缓蚀剂。通过电化学阻抗法,研究了双咪唑啉缓蚀剂在饱和CO_2油田采出水介质中对J55油管钢的缓蚀性能,并对两口CO_2腐蚀严重的油井进行了现场加注试验。结果表明,双咪唑啉缓蚀剂在油田水介质中抑制CO_2腐蚀性能优异:加入缓蚀剂后可使电荷传递电阻大幅增加,在缓蚀剂浓度为150ml/L时,缓蚀率可达96.3%;两口试验井加注缓蚀剂后,腐蚀速率大幅下降,缓蚀率可达85%以上,现场使用效果优异。     

THE ROLE OF PHOSPHONATE DERIVATIVES ON THE CORROSION INHIBITION OF STEEL IN HCL MEDIA

The inhibition of corrosion of steel by two P-containing compounds, sodium methyldodecyl phosphonate and sodium methyl (11-smethacryloyloxyundecyl) phosphonate, in hydrochloric acid has been investigated at various temperatures using electrochemical techniques (impedance spectroscopy (EIS), potentiodynamic polarization) and weight loss measurements. Inhibition efficiency (E%) increased with phosphonate concentration. Adsorption of inhibitors on the steel surface in 1 M HCl follows the Langmuir isotherm model. EIS measurements showed that the dissolution process of steel occurred under activation control. Polarization curves indicated that inhibitors tested acted as cathodic inhibitors. The temperature effect on the corrosion behavior of steel in 1 M HCl without and with the inhibitor was studied in the temperature range from 313 to 353 K. The adsorption free energy and activation parameters for the steel dissolution reaction in the presence of phosphonates were determined.     

Eco friendly inhibitor for corrosion inhibition of mild steel in phosphoric acid medium

The inhibition effect of Zenthoxylum alatum plant extract on the corrosion of mild steel in 20, 50 and 88% aqueous orthophosphoric acid has been investigated by weight loss and electrochemical impedance spectroscopy (EIS). Plant extract is able to reduce the corrosion of steel more effectively in 88% phosphoric acid than in 20% phosphoric acid. The effect of temperature on the corrosion behaviour of mild steel in 20, 50 and 88% phosphoric acid with addition of plant extract was studied in the temperature range 50-80 °C. Results on corrosion rate and inhibition efficiency have indicated that this extract is effective up to 70 °C in 88% phosphoric acid medium. Surface analysis (XPS and FT-IR) was also carried out to establish the mechanism of corrosion inhibition of mild steel in phosphoric acid medium.     

The Corrosion Inhibition Performance and Mechanism of Rhamnolipid for X65 Steel in CO2-Saturated Oilfield-Produced Water

The corrosion inhibition effect and mechanism of rhamnolipid (RL) were studied for X65 steel in oilfield-produced water saturated with CO₂ using the weight loss method, electrochemical measurements, surface analysis, surface-enhanced Raman spectroscopy (SERS), and quantum chemical calculations. The results prove that RL is an excellent inhibitor against CO₂ corrosion and predominantly inhibits the anodic corrosion reaction of X65 steel. The inhibition performance of RL is connected with surface activity and molecular structure. RL adsorbs on the metal surface by the reactivity centers to form a protective film, and the film has good inhibition ability for X65 steel for up to 168 h.     

一种无磷缓蚀阻垢剂的研制及其性能研究

以丙烯酸-2-丙烯酰胺-2-甲基丙磺酸共聚物、苯甲酸钠、氨基磺酸、异抗坏血酸钠和锌盐为原料研制一种循环冷却水无磷缓蚀阻垢剂.采用旋转挂片腐蚀试验、电化学试验、静态阻垢试验对循环冷却水无磷缓蚀阻垢剂的缓蚀和阻垢性能进行评定,采用扫描电子显微镜(SEM)对碳钢试片表面腐蚀形貌进行观察,结果表明循环冷却水无磷缓蚀阻垢剂是一种...     

Eco-friendly corrosion inhibitor from Pennisetum purpureum biomass and synergistic intensifiers for mild steel

Extracts of elephant grass(Pennisetum purpureum) blended with some intensifier halides like ammonium chloride(AMC) and potassium iodide(PTI) were investigated as corrosion inhibitor for mild steel.The corrosion process was monitored in 3.5% HCl by mass loss and electrochemical techniques at 30,40,50,60 and 90 °C.Addition of AMC and PTI increased the inhibition efficiency with the highest inhibition efficiency obtained with PTI blended extract.The blends behaved as mixed type inhibitors and were spontaneously adsorbed on mild steel surface in exothermic nature.Synergistic parameters of the intensifier ions revealed cooperative effect.Kinetic data treatment indicated increase in energy barrier by intensifier ions.The results demonstrate that elephant grass extract blended with halide ions can act as alternative ecofriendly inhibitor for mild steel at elevated temperatures.