Ultra-fast self-repairing of anti-corrosive coating based on synergistic effect between cobalt octoate and linseed oil

A new microcapsule was prepared by a facile emulsions process for improving the self-repairing speed of anti-corrosive polymer coating. The microcapsule is based on the cobalt octoate/linseed oil and GO nanosheets, which acts as core and shell. The new microcapsule in polyurethane coating provided the ultra-fast self-repairing speed (ca.5.0 min). The result was attributed to synergistic catalytic curing reaction of linseed oil in presence of cobalt octoate and O2. Furthermore, it also improved their anti-corrosion properties due to the good barrier of the GO nanosheets. The work confirms the formation of anti-corrosive polymer coating with ultra-fast self-repairing performance for various applications. •A new rapid self-repairing anti-corrosive coating was developed.•A new microcapsule was synthesized based on catalytic O2 curing reaction.•It showed ultra-rapid self-repairing of 5 min for anti-corrosive performance.