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咪唑啉季铵盐缓蚀剂的制备及其性能研究 总被引:2,自引:0,他引:2
采用苯甲酸、三乙烯四胺为原料合成咪唑啉母体,用1-氯-3-苯基丙烷对其进行改性来制备咪唑啉季铵盐缓蚀剂。针对国内某含CO2油田的开发状况,动态失重法研究了咪唑啉季铵盐在6MPa下模拟油田水介质中对L80钢在不同缓蚀剂浓度、不同温度和不同时间下的缓蚀性能。结果表明:在试验条件下,随着温度的升高,缓蚀效率有明显的下降,到90℃时变化趋于平缓;在腐蚀反应初期,腐蚀速率很高,但随着腐蚀时间的延长,腐蚀速率明显下降,在较长的一段时间之后,缓蚀效率就几乎不再下降,而是稳定在一个较小的范围之内,所合成的缓蚀剂达到了预期的结果。 相似文献
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采用一步法合成了1-丁基-3-甲基咪唑溴盐([BMIM]Br)和1-己基-3-甲基咪唑溴盐([HMIM]Br)等两种烷基咪唑离子液体,并通过电化学阻抗、动电位极化和失重法研究[BMIM]Br和[HMIM]Br对15Mn碳钢在1 mol/L盐酸溶液中的缓蚀行为。研究结果表明:此两种缓蚀剂在1 mol/L盐酸溶液介质中对碳钢都有良好的缓蚀效果,其缓蚀效率都随着缓蚀剂的浓度的升高而增大,在同浓度条件下,缓蚀效率顺序为:[HMIM]Br[BMIM]Br。动电位极化曲线测量表明此两种1,3-二烷基咪唑溴盐的加入对碳钢的阴阳极腐蚀过程都具有抑制作用,[BMIM]Br和[HMIM]Br属于混合型缓蚀剂。同时计算了相关热力学参数如吸附平衡常数(Kads)以及标准吸附自由能(ΔGads)来阐述缓蚀剂的缓蚀机制,热力学计算说明[BMIM]Br和[HMIM]Br在碳钢表面发生了自发的物理吸附。 相似文献
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系列酸化缓蚀剂型表面活性剂的合成及缓蚀机理的研究 总被引:1,自引:0,他引:1
本课题合成了系列咪唑啉树脂缓蚀剂型表面活性剂。研究了它们在盐酸介质中的腐蚀率与温度浓度的关系,并对化合物结构与缓蚀性能及表面活性的关系进行了讨论。 相似文献
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将咪唑啉型缓蚀剂与其它三种物质进行复配得到一种新型缓蚀剂。利用静态失重法测定了采用咪唑啉型缓蚀剂在盐酸介质及乙烯压缩单元混合液中Q235钢的腐蚀速度和相应的缓蚀效率,同时考察了该缓蚀剂的抗乳化性能。结果表明,该咪唑啉型缓蚀剂在盐酸介质中对Q235钢具有较强的缓蚀能力。在pH=4盐酸溶液中,温度是40℃,腐蚀时间为6h及缓蚀剂加入浓度为100μg/g时缓蚀率达到了97.9%,腐蚀速率仅为O.0008mm/a,远低于我国石油天然气行业标准规定的指标,并且该缓蚀剂具有良好的抗乳化性能。 相似文献
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高浓度氯离子环境中铜合金缓蚀的电化学研究 总被引:6,自引:0,他引:6
应用线性电位扫描(LSV)和Tafel实验等电化学测试技术,研究了苯并三氮唑(BTA)浓度、缓蚀剂的复配、温度对铜合金在高浓度氯离子(25%氯化钙溶液)环境中腐蚀行为的影响。结果表明:缓蚀剂浓度改变将引起缓蚀效果的变化,BTA浓度较低时,铜合金腐蚀电位随缓蚀剂浓度增大而升高,腐蚀速率降低;BTA浓度超过0.2%后,铜合金腐蚀电位和腐蚀速率趋于稳定;NaNO2、Na2MoO4、(NH4)2MoO4等缓蚀剂与BTA复配,对改善缓蚀效果有一定作用;温度对缓蚀效果有重要影响,铜合金在高浓度氯离子溶液中的腐蚀速率随温度的升高而加快,缓蚀剂的缓蚀效果随温度的升高而降低。 相似文献
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为了研究土酸介质中烷基季铵盐类阳离子表面活性剂对不锈钢的缓蚀及吸附作用,采用静态失重法在不同温度的10%土酸溶液中苯扎氯铵对304#不锈钢的缓蚀作用,应用吸附理论和Sek ine方法对静态挂片试验数据进行处理。结果表明,苯扎氯铵在不锈钢表面的定向吸附是产生缓蚀的主要原因,当其含量达到一定浓度后,缓蚀作用基本保持不变;在浓度为0~0.2%时,其在不锈钢表面的吸附服从Langmu ir吸附等温式,相关系数大于0.99;缓蚀率随浓度的增加和温度的升高而增大,是由吸附过程中表现为总熵增加的特点决定的;获得了吸附过程ΔHo、ΔSo和ΔGo等重要热力学参数。 相似文献
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In phosphoric acid solution (40% H3PO4), the corrosion behaviour of graphite and stainless steels was studied by the use of different electrochemical methods, namely polarization curve analysis, electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). The combined effect of chemical impurities and the increase of medium temperature was studied to approach the real conditions in the process of phosphoric acid manufacturing. It was found that the current density measured by polarization curves increased with the presence of chloride and sulphate ions in the acid solution whatever the tested material. Compared to stainless steels, graphite had the best corrosion resistance in polluted phosphoric acid. However, for graphite the increase of temperature from 20 to 80 °C induced an increase of the corrosion rate and potential and a decrease of the resistance confirmed by EIS results. Subsequently, local currents were detected at the surface of the sample by using the scanning vibrating electrode technique. From the data obtained, graphite surface manifested a distinctive behaviour from that of stainless steels. A generalized corrosion was occurred on graphite whereas a localized corrosion was observed for stainless steels. These results show a clear interest of graphite as component material in some of the equipments of the phosphoric acid industry. 相似文献
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文章通过静态失重法和电化学法对缓蚀剂烯丙基硫脲在盐酸体系中对金属材料的缓蚀性能进行了研究。分别考察了不同缓蚀剂浓度、挂片温度及不同金属材料等情况下烯丙基硫脲的缓蚀性能。结果表明,烯丙基硫脲对Q235碳钢的缓蚀性能较好,失重法实验结果表明,在20℃下,0.5 mol/L盐酸溶液中加入100 ppm烯丙基硫脲对不锈钢的缓蚀率可达93%;0.5 mol/L盐酸溶液中加入50 ppm烯丙基硫脲对Q235碳钢的缓蚀率可达94%。电化学法实验结果则表明,当烯丙基硫脲浓度达到1000 ppm时,对不锈钢的缓蚀率达到97%,对Q235碳钢的缓蚀率可达98%。 相似文献
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2-(N,N-dimethylamino) benzylidene imino-4-(4-methyl phenyl)-1,3-thiazole (DIMPT), 2-benzylidene imino-4-(4-methyl phenyl)-1,3-thiazole (BIMPT), 2-salicylidene imino-4-(4-methyl phenyl)-1,3-thiazole (SIMPT) and 2-cinnamylidene imino-4-(4-methyl phenyl)-1,3-thiazole (CIMPT) were synthesized in the laboratory and their influence on the inhibition of corrosion of mild steel in 20 formic acid and 20 acetic acid was investigated by weight loss and potentiodynamic polarization techniques. The inhibition efficiency of these compounds was found to vary with their nature and concentration, temperature, immersion time and acid concentration. The values of activation energy and free energy of adsorption of the thiazoles were calculated to investigate the mechanism of corrosion inhibition. The adsorption of all the thiazoles on mild steel surface was found to obey Langmuir adsorption isotherm. The potentiodynamic polarization result revealed that the compounds studied are mixed type inhibitors. Electrochemical impedance spectroscopy was used to investigate the mechanism of corrosion inhibition. 相似文献
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热处理与加工成型工艺对双相不锈钢流动腐蚀的影响 总被引:1,自引:0,他引:1
研究了热处理与加工成型工艺对双相不锈钢在流动 3 .5 %NaCl溶液中流动腐蚀的影响。结果表明 ,随着固溶处理温度Ts 的升高 ,锻压双相不锈钢的耐蚀性降低 ;随着时效强化时间的延长 ,锻压双相不锈钢的硬度增大 ,耐蚀性有所提高 ,但是锻压双相不锈钢的耐流动腐蚀性能与它的硬度并不存在一致对应的关系。铸造双相不锈钢在流动 3 .5 %NaCl溶液中的腐蚀速度随着介质流速的增大而缓慢上升 ,高流速条件下 ,其表面发生了严重的坑、点等局部腐蚀。固体颗粒的加入 ,促使其流动腐蚀加剧 ,且存在一个使腐蚀速度急剧上升的临界流速值 ,其流动腐蚀过程主要受阳极过程控制 相似文献
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Berrin Duran İrem Çakmakcı Ünver Gözen Bereket 《Journal of Adhesion Science and Technology》2013,27(13):1467-1479
Poly(N-methyl carbazole) (PNMeCz) coating was deposited on 304 type stainless steel (SS) by electropolymerization of N-methyl carbazole monomer in tetrabutylammonium perchlorate containing acetonitrile solution using cyclic voltammetry. PNMeCz coating was characterized by attenuated total reflectance-Fourier transform infrared spectroscopy, scanning electron microscopy, thickness, conductivity, and contact angle measurements. Corrosion performance of the polymer-coated steel electrodes was investigated in 1 M H2SO4 solution using open circuit potential–time (Eocp–t) curves, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques. PNMeCz coating was found to provide anodic protection to the substrate and significantly reduce the corrosion rate of SS in acidic medium. 相似文献
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The Dynamic Electrochemical Impedance Spectroscopy has been applied for stress corrosion cracking (SCC) investigations. The effect of applied potential and tensile stresses on the stress corrosion cracking behaviour of type 304L stainless steel (SS) immersed in 0.5 M NaCl solution of room temperature has been examined. This paper presents impedance spectra obtained for 304L stainless steel samples at the different potential values. The results obtained proved the possibility of providing new details about the dynamics of the initiation and propagation of the crack path compared to classical electrochemical techniques. 相似文献
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用失重法测定了固溶处理态和固溶+时效处理态CD-4MCu双相不锈钢在稀硫酸介质中的腐蚀磨损速率。结果表明,CD-4MCu在固溶态时硬度低,耐腐蚀磨损性能差;在固溶+时效处理态时硬度高,耐腐蚀磨损性能好。介质温度和浓度升高,CD-4MCu双相不锈钢腐蚀及磨蚀增加,腐蚀磨损交互作用增大。 相似文献