Adhesion Promoter Mechanism
Manchem® adhesion promoters will react with a variety of metal substrates, including phosphatized steel, cold rolled steel, galvanized steel and aluminum. Manchem adhesion promoters will also react with most pigments and fillers. It is recommended that evaluations begin with 0-3% zircoaluminate as supplied based upon resin solids.
Example: Alkyd/Polyester Coatings
The importance of Manchem Zircoaluminate adhesion promoter is apparent in all metal finishing paint systems where the coupling agent effectively prevents exposure of metal resulting from poor wet adhesion.
As soon as any metal is exposed, osmotic pressure created within the microblister leads to blister expansion, followed by blister eruption. Corrosion of metallic substrates results. Manchem adhesion promoters retard corrosion by preventing blister initiation as a consequence of the excellent wet adhesion characteristics that the coupling agent imparts to the system.