Creating the рH-sensitive corrosion-inhibiting container structures based on the azole-intercalated molybdenum oxide particles with oligooxometalate shell

Abstract

The container structures consisting of the core made of layered molybdenum oxide intercalated with 3-amono-1,2,4-triazole (it behaves as the corrosion inhibitor) capped with the shell made of polymerized tungsten oxide were synthesized employing the polycondensation of oxocompounds. It is shown that in the acid (pH < 5.5) and alkali (pH > 8.5) media, the coating continuity appears to be broken reversibly, which facilitates the emission of the encapsulated compounds from the containers. The intrinsic redox activity inherent into the oligooxometalate shell permits one to immobilize the synthesized containers by co-precipitation with galvanic nickel, whereas the possibility to open the container as a result of local pH value variations accompanying the corrosion process ensures the autonomic corrosion protection of the resultant metal-matrix coatings.