Electrochemical effects of pH value on the corrosion inhibition and microstructure of cerium doped trivalent chromium conversion coating on Zn
| Autor: | Laibin Wang, Xiahe Liu, Mei Wang, Hongxu Li, Yi Xu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope 020209 energy General Chemical Engineering Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology General Chemistry engineering.material urologic and male genital diseases 021001 nanoscience & nanotechnology Corrosion Dielectric spectroscopy Cerium Chromium chemistry.chemical_compound Coating chemistry Conversion coating 0202 electrical engineering electronic engineering information engineering engineering General Materials Science 0210 nano-technology |
| Zdroj: | Corrosion Science. 167:108538 |
| ISSN: | 0010-938X |
| Popis: | The electrochemical effects of cerium doped trivalent chromium conversion (TCC) coating on Zn were studied at normal temperature with potential-time curve, polarization curve, impedance spectroscopy, scanning electron microscope and energy dispersive spectroscopy. The results show protection of TCC coating increases, subsequently decreases by raising pH values. The interface of TCC coating/Zn substrate within pH 1.5–2.0 existing with metastable oxides reacts as diffusion-electrochemical mixed control, the TCC coating into pH 2.2 exists with dominated stable Cr-rich layer, then the formation rate of coating after pH 2.5 decreases. The corrosion mechanism was discussed from oxide stability in potential-pH diagrams and structural models. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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