Propane–1,2,3-triol-loaded
polysulfone (PSF) microcapsules
were prepared by the solvent evaporation method. The particle size
of the microcapsules is about 140 μm. The shell wall thickness
is about 17 μm approximately. The microcapsules have high thermal
stability and antiwear performance. The self-healing coating was prepared
by adding the prepared capsule into the epoxy resin coating. After
electrochemical and corrosion immersion experiments, the resistance
modulus of the coating added to the microcapsules was higher than
the others in a 3.5 wt % NaCl corrosion solution, and it had the lowest
corrosion current density, so the self-healing microcapsule coatings
showed excellent healing ability and corrosion inhibition function
for microcracks. This was attributed to the formation of a hydrophobic
film after propane–1,2,3-triol was released from the damaged
microcapsules.
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