کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5369465 | 1388433 | 2008 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synergism between rare earth cerium(IV) ion and vanillin on the corrosion of steel in H2SO4 solution: Weight loss, electrochemical, UV-vis, FTIR, XPS, and AFM approaches
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کلمات کلیدی
AFMRare earth - (عناصر یا فلزات) خاکی کمیابUV–Vis - UV-VisAdsorption - جذبSulfuric acid - سولفوریک اسید، اسید سولفوریک، جوهر گوگردFTIR - طیف سنج مادون قرمزXPS - طیف نگاری فوتوالکترونی اشعه ایکسCold rolled steel - فولاد نورد سردCorrosion inhibitor - مهار کننده خوردگیSynergism - همکاریVanillin - وانیلین
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Synergism between rare earth cerium(IV) ion and vanillin on the corrosion of steel in H2SO4 solution: Weight loss, electrochemical, UV-vis, FTIR, XPS, and AFM approaches Synergism between rare earth cerium(IV) ion and vanillin on the corrosion of steel in H2SO4 solution: Weight loss, electrochemical, UV-vis, FTIR, XPS, and AFM approaches](/preview/png/5369465.png)
چکیده انگلیسی
The synergism between rare earth cerium(IV) ion and vanillin (4-hydroxy-3-methoxy-benzaldehyde) on the corrosion of cold rolled steel (CRS) in 1.0 M H2SO4 solution at five temperatures ranging from 20 to 60 °C was first studied by weight loss and potentiodynamic polarization methods. The inhibited solutions were analyzed by ultraviolet and visible spectrophotometer (UV-vis). The adsorbed film of CRS surface containing optimum doses of the blends Ce4+-vanillin was investigated by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM). The results revealed that vanillin had a moderate inhibitive effect, and the inhibition efficiency (IE) increased with the vanillin concentration. The adsorption of vanillin obeyed Temkin adsorption isotherm. Polarization curves showed that vanillin was a mixed-type inhibitor in sulfuric acid, while prominently inhibited the cathodic reaction. For the cerium(IV) ion, it had a negligible effect, and the maximum IE was only about 20%. However, incorporation of Ce4+ with vanillin improved significantly the inhibition performance. The IE for Ce4+ in combination with vanillin was higher than the summation of IE for single Ce4+ and single vanillin, which was synergism in nature. A high inhibition efficiency, 98% was obtained by a mixture of 25-200 mg lâ1 vanillin and 300-475 mg lâ1 Ce4+. UV-vis showed that the new complex of Ce4+-vanillin was formed in 1.0 M H2SO4 for Ce4+ combination with vanillin. Polarization studies showed that the complex of Ce4+-vanillin acted as a mixed-type inhibitor, which drastically inhibits both anodic and cathodic reactions. FTIR and XPS revealed that a protective film formed in the presence of both vanillin and Ce4+ was composed of cerium oxide and the complex of Ce4+-vanillin. The synergism between Ce4+ and vanillin could also be evidenced by AFM images. Depending on the results, the synergism mechanism was discussed from the viewpoint of adsorption theory.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 254, Issue 17, 30 June 2008, Pages 5574-5586
Journal: Applied Surface Science - Volume 254, Issue 17, 30 June 2008, Pages 5574-5586
نویسندگان
Xianghong Li, Shuduan Deng, Hui Fu, Guannan Mu, Ning Zhao,