Synergistic inhibition effect of red tetrazolium and uracil on the corrosion of cold rolled steel in H3PO4 solution: Weight loss, electrochemical, and AFM approaches
Synergistic inhibition effect of red tetrazolium and uracil on the corrosion of cold rolled steel in H3PO4 solution: Weight loss, electrochemical, and AFM approaches
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DOI：
10.1016/j.matchemphys.2009.02.025
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发表时间：
2009-06
影响因子：
4.6
通讯作者：
Xianghong Li;S. Deng;H. Fu
中科院分区：
文献类型：
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作者：
Xianghong Li;S. Deng;H. Fu
采用失重法和动电位极化法研究了在1.0-10.0M H_3PO_4溶液中，红色四氮唑（RT）和尿嘧啶（Ur）对冷轧钢（CRS）的协同缓蚀作用。原子力显微镜（AFM）提供了CRS的表面条件。结果表明，RT对土壤中的有机物有一定的缓蚀作用，其吸附符合Freundlich吸附等温式。极化曲线表明，RT在磷酸溶液中为混合型缓蚀剂。对Ur的缓蚀效果较差，表现为阴极型缓蚀剂。然而，RT与Ur的掺入显着提高了抑制性能。RT与Ur联用的抑制效率（IE）高于RT与Ur单用的IE之和，具有协同作用。极化研究表明，RT/Ur混合物作为一种混合型缓蚀剂，它大大抑制了阳极和阴极反应。原子力显微镜（AFM）图像显示，RT和Ur具有协同抑制作用。在此基础上，从共吸附的角度对协同作用机理进行了探讨。
The synergistic inhibition effect of red tetrazolium (RT) and uracil (Ur) on the corrosion of cold rolled steel (CRS) in 1.0–10.0M H3PO4solution was first studied by weight loss and potentiodynamic polarization methods. Atomic force microscope (AFM) provided the CRS surface conditions. The results revealed that RT had a moderate inhibitive effect, and the adsorption of RT obeyed the Freundlich adsorption isotherm. Polarization curves showed that RT was a mixed-type inhibitor in phosphoric acid. For the Ur, it had a poor inhibition effect, and acted as a cathodic inhibitor. However, incorporation of RT with Ur improved significantly the inhibition performance. The inhibition efficiency (IE) for RT in combination with Ur was higher than the summation of IE for single RT and single Ur, which was synergism in nature. Polarization studies showed that the RT/Ur mixture acted as a mixed-type inhibitor, which drastically inhibited both anodic and cathodic reactions. The synergistic inhibition effect of RT and Ur could also be evidenced by AFM images. Depending on the results, the synergism mechanism was discussed from the viewpoint of co-adsorption.