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- W2019796593 abstract "Abstract Penetrating corrosion inhibitors are thought to be able to penetrate through the capillary structure of concrete to reinforcing steel and to reduce the already initiated corrosion of steel. In this work the ability of calcium nitrite to inhibit the chloride induced corrosion of steel was studied. The test protocol was adjusted to simulate the performance of penetrating corrosion inhibitors in concrete structures. Steel samples were first prepassivated in saturated solution of Ca(OH) 2 and then exposed to the same solution with 1% NaCl addition, simulating pore liquid in chloride contaminated concrete. After the initiation of steel corrosion, the first dose of calcium nitrite was added, and then its concentration was gradually increased and the inhibition effect was related to the molar ratio of chloride to nitrite ions [Cl − ]/[NO 2 − ]. Different rates of the increase in the inhibitor concentration were applied. Electrochemical impedance spectroscopy was used to follow the behaviour of steel at different stages of the corrosion process. The evolution of acquired spectra reflected the initiation of localized corrosion of steel and then the gradual inhibition with increasing concentration of the inhibitor. It was found, that calcium nitrite is able to inhibit the initiated corrosion (pitting) of steel and the optimum inhibitor efficiency was observed for the [Cl − ]/[NO 2 − ] ratio below 1. The inhibition efficiency was larger, when this value of the [Cl − ]/[NO 2 − ] ratio was reached in early stages of the corrosion development. Calcium nitrite can be effective as a penetrating corrosion inhibitor for steel in concrete, if it will be present in the sufficient concentration at the steel surface in early stages of the corrosion development." @default.
- W2019796593 created "2016-06-24" @default.
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- W2019796593 date "2011-09-01" @default.
- W2019796593 modified "2023-09-27" @default.
- W2019796593 title "Impedance study on calcium nitrite as a penetrating corrosion inhibitor for steel in concrete" @default.
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- W2019796593 doi "https://doi.org/10.1016/j.electacta.2011.01.069" @default.
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