The benefits of self-corrosion control summarised
Friday, 28 October 2011
It is essential to detect corrosion when it occurs, and preferably at an early stage, so that action can be taken to avoid structural or other damage to the metal.
The benefits of self-corrosion summarised Source: Pixelio/Rost
Nearly all metals and their alloys are subject to corrosion that causes them to lose their structural integrity or other functionality. Luz M. Calle and his colleagues from the NASA Kennedy Space Center, US, developed a multifunctional smart coating for autonomous corrosion control using microcapsules that react to the pH changes associated with the onset of corrosion. The microcapsules may give early indications of corrosion, control it by delivering corrosion inhibitors, or deliver self-healing or film-forming agents capable of repairing mechanical damage to the coating. Various pH-sensitive microcapsules have been synthesised. Preliminary salt fog test results confirm that microcapsules and microparticles can be used both to detect corrosion before visible rust appears and to deliver corrosion inhibitors. The current work is focused on optimising the concentration of indicator in the microcapsules or microparticles as well as the release properties of the microcapsules and particles when incorporated into coatings. Read more in the upcoming European Coatings Journal 11/2011, page The magazine will be published on 01.11.2011, page 18 ff.
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