The effect and mechanism of NO2-LDH inhibiting the reinforcement corrosion
Nitrite intercalation magnesium-aluminum hydrotalcite(NO2-LDH)was prepared by roasting and reduction method with carbonate type magnesium-aluminum hydrotalcite as raw material and sodium nitrite as ion exchanger,taking NO2-LDH as rust inhibitov,its corrosion effect and corrosion mechanism on HPB300 reinforced steel are studied by the saline dry and wet circulation and full soaking experiment.The research results show that:with the increase in NO2-LDH,the corrosion area of the steel corrosion under the dry and wet circulation of the saline water is significantly reduced;in the full immersion environment,NO2-LDH uses the steel bars in the simulated salt corrosion solution for a long time in low and moderate corrosive areas,while the steel bars in the simulation salt corrosion solution are not mixed with NO2-LDH and simulation salt in high corrosion areas;the switching and ad-sorption of chloride in the corrosive solution and release nitro root is the main reason why NO2-LDH can significantly delay the corrosion of the reinforcement.
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