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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Effect of NO_3~- Ion on the Corrosion Behavior of Galvanized Coating in Alkaline Solution
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Effect of NO_3~- Ion on the Corrosion Behavior of Galvanized Coating in Alkaline Solution

机译：Effect of NO_3~- Ion on the Corrosion Behavior of Galvanized Coating in Alkaline Solution

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摘要

The influence of NO_3~- 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 NO_3~- ion modified the general scheme of the dissolution and passivation of the HDG coating in the saturated Ca(OH)2 solution. NO_3~- ion not only increased the anodic reactivity of the HDG coating in the early corrosion process but also inhibited hydrogen evolution. The presence of NO_3~- 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 NO_3~- ion was modified after long-time immersion. A possible mechanism of the NO_3~- ion's effect on the corrosion behavior of galvanized steel in the alkaline solution was also discussed.

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