The adhesion degradation of rubber / galvanized - steel direct bonding system was accelerated by moisture .The route that moisture reached the rubber/galvanized steel interface through, and improvement of stability of the adhesion system was studied.
Following results were obtained. (1)The moisture does not penetrate through the rubber/metal interface, but through the rubber bulk phase. (2)Of the rubber components, emulsion-polymerized SBR shows the highest amount of moisture adsorption. So compounding solution-polymerized rubber as main material instead of emulsion-polymerized rubber, the adhesion stability under high moisture condition was remarkably improved.