Method of bonding phosphated steel surfaces electrodeposited wit

Details Method of bonding phosphated steel surfaces electrodeposited wit Method of bonding phosphated steel surfaces electrodeposited wit

1984-05-29

1985-10-01

Gallagher, John J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156315, 156319, 156330, 428414, 525482, 525486, 525524, C09J 502

Patent

active

045444323

ABSTRACT:
A method has been developed to use a structural epoxy adhesive to bond together surfaces of phosphated steel electrodeposited with an organic primer. The specially formulated epoxy adhesive contains a cross-linkable epoxy novolac resin, an epoxy reactive diluent, and an imidazole curing agent substituted in at least one position with an alkyl or a hydroxyalkyl group. The amount of the curing agent used in the formulation is much lower than that in a conventional two-part epoxy adhesive such that the adhesive will not attack or degrade the primer layer to weaken the bond strength. The reactive diluent used reduces the viscosity of the mixed adhesive system to facilitate dispersion and wetting of the adhesive on the coated steel surface. Bond strength achieved by this method is adequate for automotive structural applications and is capable of withstanding extended exposure to humidity, salt spray, and other hostile automotive environments without appreciable loss.

REFERENCES:
patent: 3792018 (1974-02-01), Logan
patent: 3838094 (1974-09-01), Sporck
patent: 3923571 (1975-12-01), Aoki et al.

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