Study of the mechanisms of humidity-induced adhesion loss of chlorinated rubber on cleaned and rusted steel substrates
Keywords:Chlorinated rubber, Interfacial degradation, Adhesion, X-ray photoelectron spectroscopy (XPS)
The effect of time of exposure to the humidity on the behaviour of the system chlorinated rubber paint-steel substrate (cleaned or pre-rusted) is investigated from the interfacial chemistry and adhesion points of view. After one day of humidity exposure, the paint-rust free steel substrate system shows an increase of adhesion. A maximum adhesion value is obtained after 15 days of exposure. This behaviour is similar to that previously described for a pre-rusted steel substrate. After 30-60 days of exposure, the adhesion strength values show an important reduction and the locus of adhesion loss shifts from the paint inside to the interphase between the metallic substrate and the paint.
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