Abstract

The ESCA spectra of two commercial sets of brass coated steel cords giving “good” and “bad” adhesion levels to a commercial rubber used in radial tyres have been obtained. Their interpretation suggests that the brass surface of the “bad” became more rich in β phase in some step of the production process. This might be connected to an overtemperature suffered by the cord in the production line and subsequent different oxidation processes of the two samples. This phenomenon is found to influence also the chemical situation of the subsurface as it may be investigated by argon ion sputtering, as well as the chemical evolution of the two systems for prolonged ambient atmosphere exposure. In particular the two subsurfaces tend to become chemically similar for aging, thus justifying the observation of an averaging of the adhesion level of the two types of cords in aging.

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