Active sensing coating for early detection of corrosion processes


A corrosion sensing coating based on specially developed polymeric microcapsules with a pH-indicator is reported. The synthesis of the microcapsules is designed in a way to ensure their optimal compatibility with the polyurethane protective coatings and to allow release of the indicator at higher pH values. The obtained polyurea microcapsules have a regular and microsized morphology and a loading content of 12 wt%. The developed sensing coating applied on aluminium and magnesium alloys is able to indicate initiation of corrosion processes through a pink coating coloration, as a result of local pH increase in the cathodic areas.



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Maia, F; Tedim, J; Bastos, AC; Ferreira, MGS; Zheludkevich, ML

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The authors thank CICECO (ref. PEst-C/CTM/LA0011/2013) and FM thanks FCT for PhD grant SFRH/BD/72663/2010.

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