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Novel model system to study the influence of rubber compound formulation on the structure and composition of the rubber–brass interphase
Author(s) -
Holtkamp D.,
Elschner A.,
Müller G.,
Pieroth M.
Publication year - 1995
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740230306
Subject(s) - brass , natural rubber , vulcanization , adhesion , materials science , interphase , scanning electron microscope , chemical engineering , transmission electron microscopy , sputtering , composite material , corrosion , chemistry , metallurgy , thin film , copper , nanotechnology , biology , engineering , genetics
A model system was developed to study the influence of the rubber formulation and/or the aging conditions on the adhesion between brass and rubber. The bonding compounds were vulcanized on thin, homogeneous brass layers that had been prepared by sputtering onto special polymeric substrates; some of these compounds were steam‐aged under controlled conditions subsequently. After the separation of the polymeric film, combined analytical electron microscopy (transmission electron microscopy/energy dispersive spectroscopy; TEM/EDS) and sputter neutral mass spectrometry (SNMS) analyses were performed. While the TEM/EDS studies offer a detailed insight into the morphological structure of the interphase, the SNMS depth profiles allow a rapid and reliable differentiation between various rubber formulations. With these model samples the beneficial effect of boric acid esters on the adhesion of cobalt‐containing bonding compounds, which is observed in a typical short‐term adhesion test after steam‐aging, can be explained: boric acid esters act with cobalt salts as corrosion inhibitors for brass, preventing the growth of a thick intermediate ZnO/Zn (OH) 2 layer that is the starting point for delaminations.