The results of adhesion research clarify the role of copper and zinc in adhesion bonding and adhesion degradation. For the actual interpretation of the results, the difference between surface and average bulk composition must be considered. The tendency towards zinc enrichment is mainly governed by the average brass coating composition. Besides this basic parameter, the drawing parameters may substantially influence the steel cord surface composition. The presence of ZnO in the brass surface not only influences the rubber-brass reaction, but the rate of sulfide film growth as well. A laboratory conditioning of the surface definitely reveals the real effects of average and surface composition.
Secondary ion mass spectrometry with a Cameca ion microscope was used to study the surface and in-depth composition of a 55 wt ' / ' Al-Zn coating on steel wire. Several surface contaminants of the coating (C, Na, Mg, F, C1, K, Ca, Mn and Fe) were identified and the spatial distribution of some of them and of the coating components Al, Si and Zn were obtained. The dendritic-interdendritic structure of the Al-Zn coating was observed using a secondary ion imaging facility. The distribution at the surface of the coating constituents Na and CI, C and A1 and Mn and Fe were strongly correlated. Quantitative analysis showed that the Mn and Fe surface concentrations were some hundreds and some thousand p.p.m. wt, respectively.
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