Abstract

As one of the frontier technologies in anti-corrosion field, microcapsule inhibitors still have some limitations, e.g., costly and environmental-harmfully for achieving the trigger function. This necessitates further development of some eco-friendly, cost-effective and high-efficient trigger measures to promote the application possibilities of this frontier technology. This study proposed to utilize ultrasonic wave as a wall-broken trigger towards microcapsule inhibitors. To check the trigger validity, a NaNO2-E51/UF microcapsule inhibitor was synthesized via in-situ polymerization. Morphologies and particle distribution of microcapsules were evaluated. The microcapsules were triggered by ultrasonic generator in simulated concrete pore (SCP) solution. After that, the concentrations of released sodium ions were measured at consecutive trigger times to obtain the time-dependent releasing ratio. Finally, the inhibiting performances of microcapsules were studied by various electrochemical measures. The results indicated that the microcapsules were distributed well in SCP solution and their particle size mostly ranged from 150 to 250 μm. The ultrasonic wave possessed excellent trigger performance on the microcapsules in SCP solution and the releasing ratio could reach to the maximum value (89.88%) in a few minutes. Electrochemical results indicated that the ultrasound trigger measure could exert most of the corrosion inhibition effect of the core materials in microcapsules.

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