Brominated Butyl Rubber Anticorrosive Coating and Its Self-healing Behaviors

Self-healing anticorrosive coatings in extreme environment have attracted considerable interest from researchers. In this work, 4-tertbutylpyridine(TBP) was incorporated into brominated butyl rubber(BIIR) polymer networks to form a reversible ionic bond with the highly reactive bromine anion. Based on the low glass transition temperature of the BIIR polymer and the electrostatic effects, a robust self-healing anticorrosive coating of TBP-BIIR was prepared. TBP-BIIR coating showed a maximum protection efficiency(PE) of more than 94%(TBP-BIIR-acid,94.37%; TBP-BIIR-alkali, 94.95%; TBP-BIIR-salt, 95.49%) when treated with a strong acid(HNO3, pH=2), strong base(NaOH, pH=12) and high salt solution(3.5 wt% NaCl). In addition, the PE of coating repaired exceed 89%, and the maximum PE value was approximately 95% in different solutions, which demonstrated its extinguished self-healing abilities. These results indicated that the TBP-BIIR anticorrosive coating could provide excellent safety and durability in special environment, which would be extremely beneficial to improve the working life of metal parts used in aviation and shipping, oil and gas and related industries.