Method for improving hydrolytic stability of the bond...

Details Method for improving hydrolytic stability of the bond... Method for improving hydrolytic stability of the bond...

C - Chemistry, Metallurgy

23

C

117/95

C23C 22/08 (2006.01) C09J 5/02 (2006.01)

Patent

CA 1062970

METHOD FOR IMPROVING HYDROLYTIC STABILITY OF THE BOND BETWEEN STEEL SURFACES AND ORGANIC ADHESIVES ABSTRACT A method is disclosed for improving the hydrolytic stability of the adhesive bond between an RFL type organic adhesive and the steel reinforcing element in steel-rubber composite articles. This is accomplished by a pre-treatment of the steel surface before it is coated with the organic adhesive. The pre-treatment is conducted in a continuous operation which includes the sequential steps of: (1) cleaning the metal surface by a vapor degreasing method or by immersion in a detergent containing aqueous bath followed by a hot water rinse; (2) coating the surface with a crystalline or micro- crystalline zinc phosphate; (3) rinsing the phosphated steel surface with water; (4) subjecting the phosphated surface to a chromate or chromic acid rinse; (5) rinsing again with deionized water; and finally (6) drying the steel reinforcing element.

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