Improvement of the electrochemical behaviour of Zn-electroplated steel using regenerated Cr(III) passivation baths
| Autor: | R.M. Fernández-Domene, Rita Sánchez-Tovar, C. Escrivá-Cerdán, Ane Urtiaga, R. Leiva-García, V. García, José García-Antón |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Chromate conversion coating Passivation Trivalent chromium Applied Mathematics General Chemical Engineering Metallurgy chemistry.chemical_element General Chemistry Zinc Electrochemistry 6. Clean water Industrial and Manufacturing Engineering INGENIERIA QUIMICA Dielectric spectroscopy Electroquímica Chromium chemistry Passivation baths Conversion coating Zn-electroplated steel Acer Corrosió Electroplating Emulsion Pertraction Technology |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname García-Antón, Jose Fernández Domene, Ramón Manuel Sánchez-Tovar, Rita Escrivà-Cerdán, C. Leiva-García, Rafael García, V. Urtiaga, A. 2014 Improvement of the electrochemical behaviour of Zn-electroplated steel using regenerated Cr(III) passivation baths Chemical Engineering Science 111 402 409 RODERIC. Repositorio Institucional de la Universitat de Valéncia RODERIC: Repositorio Institucional de la Universitat de Valéncia Universitat de València |
| Popis: | [EN] Conversion coatings based on trivalent chromium are more sensitive to the presence of zinc and iron impurities than the chromate formulations. This fact contributes to a decrease in the quality of passivation and to the generation of a significant amount of hazardous liquid waste. Recently, a new eco-innovative process based on Emulsion Pertraction Technology (EPT) is being implemented at industrial scale for selectively removing Zn and Fe from spent passivation baths in order to enhance the lifetime of the Cr (III) baths. In this study, the effect of Zn and Fe removal on the electrochemical behaviour of Zn-electroplated steel samples was evaluated by means of polarisation curves and electrochemical impedance spectroscopy measurements at open circuit potential conditions in 3.5 g/L NaCl solutions. The main objective was to assess the benefits brought by EPT using electrochemical methods. Cr (III) passivation baths regenerated using the EPT process have been compared to the bath used in a local industry as well as to fresh and spent baths. According to the results, the samples passivated in the EPT regenerated bath showed a significant improvement in their electrochemical behaviour compared to the samples passivated in the spent baths. This study concluded the suitability of EPT for regenerating Cr (III) passivation baths. The authors would like to express their gratitude to the Project TIGI (FP7, European Commission, Grant agreement 218390) and to Dr. Asuncion Jaime for her translation assistance. |
| Databáze: | OpenAIRE |
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