Adhesion in Chemically Hostile Environments: The Use of Filled Polymers as Diffusion Barriers

摘要

Polymer metal bonding is accomplished, in general, through a combination of chemical bonding and mechanical interlocking. In either case, the metal surface must remain uncorroded in order to preserve adhesion. If material layers that are close to the bonded interface evolve corrosive species, then the metal can be corroded and the adhesive strength reduced. One way to ameliorate this adhesive degradation is to coat the metal substrate with a barrier liner that is relatively impervious to the corrosive species. If subsequently bonded material layers evolve corrosive species, then relatively fewer of these molecules would be able to penetrate the barrier liner and corrode the substrate. The experiments reported here were performed on a polyurethane (Uralane 5753) with or without filler particles (alumina, strontium chromate, magnesium silicate, or carbon black) and subjected to gaseous hydrogen fluoride at ambient temperature. Keywords: Adhesion; Barrier liners; Corrosion; Diffusion; Fillers; Hydrogen fluoride; Metal substrates; Polymers; Reactive gases. (MGM)