用失重法、动电位极化曲线和电化学阻抗谱（EIS）研究了在1．0mol／L H2S（1）1中20～50℃烯丙基硫脲（ATU）在冷轧钢表面的吸附及缓蚀作用。结果表明：ATU对钢具有好的缓蚀作用，当ATU浓度仅为2．0mmol／L时，缓蚀率大于94%。ATU在钢表面的吸附符合Langmuir吸附模型，得出相应的吸附热力学参数（吸附自由能△G0，吸附焓△H0，吸附熵△S0），并根据这些参数详细讨论了缓蚀作用机理。ATU为混合抑制型缓蚀剂；EIS谱高频区呈半圆容抗弧而低频区呈小段感抗弧，添加ATU后电荷转移电阻显著增大。
The inhibition action of allyl thiourea （ATU） on cold rolled steel （CRS） in 1.0 mol/L H2 SO4 solution at 20℃-50 ℃ was investigated by weight loss, potentiodynamic polarization curves and electrochemical impedance spectroscopy （EIS）. The results showed that ATU is a good inhibitor for CRS in H2SO4 solution, and inhibition efficiency was higher than 94% with the inhibitor concentration of 0. 2 mmol/L. Three adsorption thermodynamic parameters including adsorption free energy AGo , adsorption enthalpy △H0 and adsorption entropy △S0 were also calculated. The inhibition mechanism was discussed in detail according to the parameters. The adsorption of ATU on CRS surface obeys Langmuir adsorption isotherm equation. Polarization curves showed that ATU acts as a mixed-type inhibitor. All EIS spectra exhibit one capacitive loop at high frequency followed by a small inductive loop at low frequency, and the charge transfer resistance increases remarkably after adding ATU inhibitor.
参考文献
| [1] | Li XH;Mu GN .Tween-40 as corrosion inhibitor for cold rolled steel in sulphuric acid: Weight loss study, electrochemical characterization, and AFM[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2005(5):1254-1265. |
| [2] | 李广超,路长青,杨文忠,俞斌.硫脲及其衍生物的缓蚀行为研究进展[J].腐蚀科学与防护技术,2001(03):169-172,封3. |
| [3] | 李向红,邓书端,付惠,木冠南.盐酸中烯丙基硫脲在钢表面的吸附及缓蚀作用[J].清洗世界,2009(01):18-22. |
| [4] | 木冠南,李向红,屈庆,周俊.稀土铈（IV）离子和钼酸钠在盐酸溶液中对冷轧钢的缓蚀协同效应[J].化学学报,2004(24):2386-2390. |
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