High-resolution photoelectron spectroscopy study of degradation of rubber-to-brass adhesion by thermal aging

► Influence of thermal aging on rubber-to-brass adhesion is investigated by chemical state analysis. ► Adhesion strength is reduced by thermal aging. ► The reduction of the Cu2S/CuS ratio and the increase in ZnO, Zn(OH)2 and ZnS in the adhesion layer are the characteristic changes induced by thermal aging. ► The aging process is stimulated by water in the surrounding environment.