Effect of NO3− Ion on the Corrosion Behavior of Galvanized Coating in Alkaline Solution
| Autor: | Yan-qi Wang, Chunshan Che, Zhu Yanbin, Gang Kong |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
Materials science Passivation Scanning electron microscope organic chemicals 020209 energy General Chemical Engineering Inorganic chemistry food and beverages 02 engineering and technology General Chemistry engineering.material 021001 nanoscience & nanotechnology Galvanization Dielectric spectroscopy Corrosion Ion symbols.namesake Coating 0202 electrical engineering electronic engineering information engineering engineering symbols General Materials Science 0210 nano-technology Dissolution |
| Zdroj: | CORROSION. 74:1421-1430 |
| ISSN: | 1938-159X 0010-9312 |
| Popis: | The influence of NO3− ion contamination of saturated Ca(OH)2 solution (pH ∼13.2) on the corrosion behavior of the hot-dip galvanized (HDG) coating was studied by means of open-circuit potential, potentiodynamic polarization test, electrochemical impedance spectroscopy, and scanning electron microscopy in this paper. Results showed that the presence of NO3− ion modified the general scheme of the dissolution and passivation of the HDG coating in the saturated Ca(OH)2 solution. NO3− ion not only increased the anodic reactivity of the HDG coating in the early corrosion process but also inhibited hydrogen evolution. The presence of NO3− ion shortened the passivation time of galvanized steel in the alkaline solution. In addition, the morphology of the passivating products on the HDG coating in the alkaline solution containing NO3− ion was modified after long-time immersion. A possible mechanism of the NO3− ion’s effect on the corrosion behavior of galvanized steel in the alkaline solution was also discussed. |
| Databáze: | OpenAIRE |
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