Synergy between Galvanic Protection and Self-Healing Paints

Langmuir : the ACS Journal of Surfaces and Colloids
Lance Michael BairdRengaswamy Srinivasan

Abstract

Painting is a cost-effective technique to delay the onset of corrosion in metals. However, the protection is only temporary, as corrosion begins once the coating becomes scratched. Thus, an increasingly common practice is to add microencapsulated chemical agents to paint in order to confer self-healing capabilities. The additive's ability to protect the exposed surface from corrosion depends upon (i) how long the chemical agent takes to spread across the exposed metal; (ii) how long the agent takes to form an effective barrier layer; and (iii) what happens to the metal surface before the first two steps are complete. To understand this process, we first synthesized 23 ± 10 μm polyurea microcapsules filled with octadecyltrimethoxysilane (OTS), a liquid self-healing agent, and added them to a primer rich in zinc, a cathodic protection agent. In response to coating damage, the microcapsules release OTS into the scratch and initiate the self-healing process. By combining electrochemical impedance spectroscopy, chronoamperometry, and linear polarization techniques, we monitored the progress of self-healing. The results demonstrate how on-demand chemical passivation works synergistically with the cathodic protection: zinc preserves t...Continue Reading

References

Jan 26, 2007·Journal of the Royal Society, Interface·A S JonesS R White
Feb 22, 2008·Nature·Philippe CordierLudwik Leibler
Mar 20, 2015·ACS Applied Materials & Interfaces·Marcia W PatchanJason J Benkoski

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