共查询到18条相似文献,搜索用时 125 毫秒
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H_2SO_4中聚乙二醇20000在钢表面的吸附及缓蚀作用 总被引:1,自引:0,他引:1
用失重法研究了在1.0mol/L H2SO4中20~50℃聚乙二醇20000(PEG-20000)在冷轧钢表面上的吸附及缓蚀作用。结果表明:PEG-20000对钢具有良好的缓蚀作用,缓蚀率随缓蚀剂浓度的增加而增大;但随温度的增加而增大。PEG-20000在钢表面的吸附符合Langmuir吸附模型。通过吸附热力学和动力学公式分别求出了相应的吸附热力学参数(吸附自由能ΔG,°吸附焓ΔH°,吸附熵ΔS°)和动力学参数表观活化能Ea,并根据这些吸附参数详细讨论了缓蚀作用机理。 相似文献
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盐酸中原儿茶醛在钢表面的吸附及缓蚀作用 总被引:1,自引:0,他引:1
用失重法和动电位极化曲线法研究了在1.0mol/L HCl中20~50℃原儿茶醛(3,4-二羟基苯甲醛)在冷轧钢表面上的吸附及缓蚀作用.结果表明:原儿茶醛具有中等程度的缓蚀作用,为混合抑制型缓蚀剂,缓蚀率随原儿茶醛的浓度增加而增大,但随温度的增加而减小;原儿茶醛在钢表面的吸附符合Freundlich吸附模型.通过吸附理论和动力学Arrhenius公式求出了相应的吸附热力学参数(吸附自由能ΔG°,吸附热ΔH°,吸附熵ΔS°)和动力学参数表观活化能Ea,并根据这些参数详细讨论了缓蚀作用机理. 相似文献
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用失重法研究了在1.0mol/L H2SO4中20-50℃聚乙二醇20000(PEG-20000)在冷轧钢表面上的吸附及缓蚀作用。结果表明:PEG-20000对钢具有良好的缓蚀作用,缓蚀率随缓蚀剂浓度的增加而增大;但随温度的增加而增大。PEG-20000在钢表面的吸附符合Langmuir吸附模型。通过吸附热力学和动力学公式分别求出了相应的吸附热力学参数(吸附自由能ΔG,°吸附焓ΔH°,吸附熵ΔS°)和动力学参数表观活化能Ea,并根据这些吸附参数详细讨论了缓蚀作用机理。 相似文献
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用失重法及电化学法研究了阴离子表面活性剂油酸钠(SO)对冷轧钢在3.0 mol/L H3PO4溶液中的缓蚀作用.结果表明:油酸钠对冷轧钢具有良好的缓蚀作用,为阴极抑制型缓蚀剂,缓蚀率随油酸钠的浓度增加而增大,而随温度的升高而减小;油酸钠在钢表面的吸附在30℃和40℃时符合校正的Langmuir吸附模型,50℃和60℃时则符合Freundlich吸附模型.通过吸附理论和化学热力学基本公式求出了相应的吸附热力学参数(吸附自由能ΔG°, 吸附热ΔH°, 吸附熵ΔS°),并根据这些参数详细讨论了缓蚀作用机理. 相似文献
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用失重法研究了在0.5~7.0 mol/L H2SO4 中20℃~60℃KBr在冷轧钢表面上的吸附及缓蚀作用.结果表明:KBr在H2SO4中具有较好的缓蚀作用,缓蚀率随KBr和H2SO4介质的浓度增加而增大,而随温度的增加稍有增大;KBr在钢表面的吸附符合校正的Langmuir吸附模型.通过吸附热力学和动力学公式分别求出了相应的吸附热力学参数(吸附自由能△G°,吸附热△H°,吸附熵△S°)和动力学参数(腐蚀速度常数k,腐蚀动力学参数B),并根据这些参数详细讨论了缓蚀作用杌理. 相似文献
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硝酸溶液中十二烷基苯磺酸钠对锌的缓蚀作用及吸附热力学研究 总被引:1,自引:0,他引:1
采用失重法研究了硝酸介质中烷基磺酸盐类阴离子表面活性剂对锌的缓蚀及吸附作用,考察了在不同温度的3%硝酸中,不同浓度的十二烷基苯磺酸钠对锌的缓蚀作用。实验结果表明,十二烷基苯磺酸钠能很好的抑制锌的腐蚀,当其含量达到一定浓度后,缓蚀作用基本保持不变,而其在锌表面上的吸附是产生缓蚀作用的重要原因。在浓度为0~300 mg/L时,十二烷基苯磺酸钠在锌表面的吸附规律服从Langmuir吸附等温式。用Sekine方法处理实验数据,从而获得了ΔH0、ΔS0和ΔG0等一系列相关的热力学参数。 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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The adsorption and inhibition effect of 6-benzylaminopurine (BAP) on cold rolled steel (CRS) in 1.0 M HCl at 25-50 °C was studied by weight loss and potentiodynamic polarization methods. The results showed that BAP was a good inhibitor in 1.0 M HCl, and the inhibition efficiency (IE) increased with the inhibitor concentration. The adsorption of BAP on the CRS surface obeyed the Langmuir adsorption isotherm equation. Both thermodynamic parameters (adsorption heat ΔH0, adsorption free energy ΔG0 and adsorption entropy ΔS0) and kinetic parameters (apparent activation energy Ea and pre-exponential factor A) were calculated and discussed. Polarization curves showed that BAP acted as a mixed-type inhibitor in hydrochloric acid. Good agreement between weight loss and polarization methods was obtained. The adsorbed film on CRS surface containing optimum dose of BAP was investigated by Fourier transform infrared spectroscopy (FTIR) and atomic force microscope (AFM). Quantum chemical calculation was applied to elucidate the adsorption mode of the inhibitor molecule onto steel surface. Depending on the results, the inhibitive mechanism was proposed from the viewpoint of adsorption theory. 相似文献
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H. Ashassi-Sorkhabi B. Masoumi P. Ejbari E. Asghari 《Journal of Applied Electrochemistry》2009,39(9):1497-1501
The inhibition performance of Basic yellow 13 dye on mild-steel corrosion in hydrochloric acid solution was studied at 25 °C
using weight loss and electrochemical techniques. The effect of inhibitor concentration on inhibition efficiency has been
studied. Inhibition efficiency increased with increase of Basic yellow 13 concentration. The results showed that this inhibitor
had good corrosion inhibition even at low concentrations (95% for 0.005 M Basic yellow 13) and its adsorption on mild-steel
surface obeys Langmuir isotherm. ΔG
ads was calculated and its negative value indicated spontaneous adsorption of the Basic yellow 13 molecules on the mild-steel
surface and strong interaction between inhibitor molecules and metal surface. The value of ΔG
ads was less than 40 kJmol−1, indicating electrostatic interaction between the charged inhibitor molecules and the charged metal surface, i.e., physical
adsorption. 相似文献
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D. Thirumoolan Vikas A. Katkar G. Gunasekaran Tapan Kanai K. Anver Basha 《Progress in Organic Coatings》2014
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. 相似文献