共查询到16条相似文献,搜索用时 109 毫秒
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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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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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中性红在盐酸溶液中对冷轧钢的缓蚀作用 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酸碱指示剂中性红对冷轧钢在1.0~8.0 mol/LHCl溶液中的缓蚀作用.结果表明:中性红对冷轧钢在1.0 moL/L HCl溶液中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校正的Langmuir吸附等温式,缓蚀率随缓蚀剂浓度的增加而增大,但随温度和盐酸浓度的增加而减小.通过吸附理论求出了相应的吸附热力学(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,腐蚀动力学常数B),并根据这些参数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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通过电导率测量、pH测量、同步热分析(STA)、Tafel极化曲线法和电化学交流阻抗谱法研究了不同浓度和温度下过期药呋塞米在1 mol/L的醋酸溶液中对冷轧钢缓蚀作用。实验结果表明:过期药呋塞米在1 mol/L的醋酸溶液中对冷轧钢有较好的缓蚀效果,且缓蚀率随着缓蚀剂浓度和温度的增加而增大。该缓蚀剂在醋酸中对钢是一种抑制阴极和阳极的混合型缓蚀剂。缓蚀剂在冷轧钢表面的吸附符合Langmuir吸附等温式,其吸附是自发、物理吸附过程。同步热分析还说明了该缓蚀剂易稳定吸附在冷轧钢表面。 相似文献
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用失重法及电化学法研究了非离子表面活性剂吐温-60对冷轧钢在1.0~8.0 mol8226;L-1盐酸溶液中的缓蚀作用. 结果表明:吐温-60对冷轧钢在1.0 mol8226;L-1盐酸溶液中具有良好的缓蚀作用,且其在钢表面的吸附符合Langmuir吸附模型. 缓蚀率随缓蚀剂浓度的增加而增大,但随盐酸浓度和温度的增加而减小. 动电位极化曲线表明,吐温-60为混合抑制型缓蚀剂,但主要是抑制阴极反应. 通过吸附理论和动力学公式求出了相应的吸附热力学参数和动力学参数,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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Effect of sodium molybdate on the corrosion behavior of cold rolled steel in peracetic acid solution 总被引:1,自引:0,他引:1
Qing Qu Lei Li Shuan Jiang Wei Bai Zhongtao Ding 《Journal of Applied Electrochemistry》2009,39(5):569-576
The effect of sodium molybdate (Na2MoO4) on the corrosion of cold rolled steel (CRS) in peracetic acid (PAA) solution was investigated by gravimetric measurements,
Tafel polarization curves, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). All the data indicate
that Na2MoO4 acts as a very good inhibitor in PAA solution. The inhibition efficiency increases with increasing concentration of Na2MoO4 and immersion time. The inhibition efficiencies, calculated from gravimetric measurements, Tafel polarization curves and
electrochemical impedance spectroscopy, are in reasonably good agreement and are very similar in the three cases. Furthermore,
polarization data show that Na2MoO4 behaves as an anodic passive type inhibitor. Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM)
were used to characterize the corrosion surface. A probable mechanism is presented to explain the experimental results. 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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钼酸盐和钨酸盐在HCl中对冷轧钢的缓蚀作用 总被引:2,自引:0,他引:2
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。 相似文献