| Corrosion Protection of Electro-Galvanized Steel by Green Conversion Coatings |
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| 作者姓名： | M irghasem Hosseini Habib Ashassi-Sorkhabi Heshmat Allah Yaghobkhani Ghiasvand |
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| 作者单位： | Electrochemistry Research Laboratory, Physical Chemistry Deportment, Chemistry Faculty, University of Tabriz, T abriz, Iran |
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| 基金项目： | Project supported by the 0ffice of the New Material and Clean Chemistry Research of the Tabriz University |
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| 摘 要： | A A cerium-based chemical conversion process was studied. First, zinc coating obtained from a free-cyanide alkaline bath, with derivative of imidazol with new brightener, was investigated, zinc-plated steel specimens were treated with a solution of 50 mmol· L^-1 Ce（NO3 ）3 The corrosion behavior of bare and treated mild galvanized steel was evaluated during exposure to 0.5 mol · L^-1 NaCl for different immersion time, using Tafel polarization curves and electrochemical impedance spectroscopy （EIS） measurements. The surface morphology of the coating was studied using scanning electron microscopy （SEM）. The composition and chemical percent of the coating were examined by X-ray dispersion energy （EDAX）. The results of these measurements showed that the newly developed cerium-based conversion coating process was a promising candidate for replacing the conventional chromate treatments used at present for galvanized steel.
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| 关 键 词： | 被覆料 碱性 稀土元素 铈 |
| 文章编号： | 1002-0721（2007）05-0537-07 |
| 收稿时间： | 28 December 2006 |
| 修稿时间： | 2006-12-28 |
Corrosion Protection of Electro-Galvanized Steel by Green Conversion Coatings |
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| M irghasem Hosseini Habib Ashassi-Sorkhabi Heshmat Allah Yaghobkhani Ghiasvand.Corrosion Protection of Electro-Galvanized Steel by Green Conversion Coatings[J].Journal of Rare Earths,2007,25(5):537-543. |
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| Authors: | Mirghasem Habib Ashassi-Sorkhabi Heshmat Allah Yaghobkhani Ghiasvand |
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| Affiliation: | aElectrochemistry Research Laboratory, Physical Chemistry Department, Chemistry Faculty, University of Tabriz, Tabriz, Iran |
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| Abstract: | A cerium-based chemical conversion process was studied. First, zinc coating obtained from a free-cyanide alkaline bath, with derivative of imidazol with new brightener, was investigated, zinc-plated steel specimens were treated with a solution of 50 mmol · L−1 Ce(NO3)3. The corrosion behavior of bare and treated mild galvanized steel was evaluated during exposure to 0.5 mol · L−1 NaCl for different immersion time, using Tafel polarization curves and electrochemical impedance spectroscopy (EIS) measurements. The surface morphology of the coating was studied using scanning electron microscopy (SEM). The composition and chemical percent of the coating were examined by X-ray dispersion energy (EDAX). The results of these measurements showed that the newly developed cerium-based conversion coating process was a promising candidate for replacing the conventional chromate treatments used at present for galvanized steel. |
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| Keywords: | green coating free-cyanide alkaline bath EIS electro-galvanized rare earths |
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