Silane as adhesion promoter in damaged areas

C. DEYÁ

PROGRESS IN ORGANIC COATINGS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2016 vol. 90 p. 28 - 33

0300-9440

tSilanes have been studied as adhesion promoters between metals (aluminum, galvanized steel and steel)and paints such as polyurethanes.The objective of this work was to study -glycidoxypropyltrimethoxysilano (glymo) as adhesion pro-moter between sandblasted steel and one water-based epoxy paint formulated in the laboratory. In somecases, the silane film was doped with sodium phosphate or sodium benzoate, and in other cases, glymoor extra epoxy resin were incorporated as part of the paint formulation.The performance of the metal?glymo?paint system was studied by electrochemical noise techniqueand accelerated tests (salt spray cabinet and humidity chamber). Dry and wet adhesions were alsodetermined.The results showed that the incorporation of -glycidoxypropyltrimethoxysilane as pretreatment orin paint formulation does not enhance paint adhesion in undamaged areas. However, when the paintedarea was damaged, the incorporation of silane in the paint or doped silane in the pretreatment enhancespaint performance in these areas.