Surface preparation for bonding iron

Details Surface preparation for bonding iron Surface preparation for bonding iron

1995-01-25

1996-07-16

Powell, William

Etching a substrate: processes

Adhesive or autogenous bonding of two or more...

Etching improves or promotes adherence of preforms being bonded

216 52, 216100, 252 792, 252 794, B44C 122, C23F 100

Patent

active

055359043

ABSTRACT:
The present invention relates to an improved etchant for iron materials and method for etching iron materials. The etchant is an aqueous solution of ferrous chloride and phosphoric acid. The etchant preferably consisting of essentially of 20.6 gm FeCl.sub.2 .multidot.4H.sub.2 O, 88 ml H.sub.3 PO.sub.4 (concentrated 85%) and deionized water sufficient to make a 500 ml solution total. The method of etching includes the steps of preparing the surface of the iron material to be etched by degreasing and abrading the surface and etching the surface by immersing the iron material in the ferrous chloride and phosphoric acid solution. After the surface has been completely dried, an epoxy material may be bonded thereto. The method and etchant of the present invention provide an iron surface which bonds well with an epoxy, but does not destroy any existing epoxy bond in the material as would be present in a wound iron core material bonded with an epoxy cement.

REFERENCES:
patent: 4610759 (1986-09-01), Klages

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