Page 221 - Handbook of Adhesion Promoters

214 Adhesion and Corrosion Protection

tance to interfacial hydrolysis with overall improved adhesion and reduced cathodic dis-
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bondment rate.
Wet and recovery states for vinyltrimethoxysilane-treated specimens at pH < isoelec-
12
tric point have the silanol groups orientation toward aluminum surface. Adhesion perfor-
mance at pH > isoelectric point is lower because of the presence of unreacted
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vinyltrimethoxysilane molecules on the surface. Water sensitivity of unreacted vinylt-
rimethoxysilane molecules leads to a poor protective performance of specimens treated at
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pH > isoelectric point.
The incorporation of γ-glycidoxypropyltrimethoxysilane as a pretreatment or in paint
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formulation does not enhance paint adhesion in undamaged areas. But in the damaged
paint area, the incorporation of silane in the paint or doped silane in the pretreatment
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enhances paint performance.
The above findings suggest that, although adhesion promoters cannot protect metal
against corrosion in a manner such as, for example, zinc layer protects steel, but their
effect on improved adhesion is essential for corrosion protection because it slows down
incursion of deleterious substances at the interface with metal.
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