Accession Number : ADD009820
Title : Preparation of Steel Surfaces for Adhesive Bonding.
Descriptive Note : Patent Application,
Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC
Personal Author(s) : Russell,William J ; Rosty,Roberta
Report Date : 24 Jun 1982
Pagination or Media Count : 7
Abstract : A principal object of the present invention is to provide a novel process and composition for etching steel, which avoids the use of ethanol solvent with phosphoric acid yet produces a steel surface which, when adhesively bonded, yields joints of comparable strength and stress durability to those obtained by use of the phosphoric acid-ethanol etchant. According to the present invention the foregoing and other objects can be achieved by contacting the steel parts with an etchant composition consisting essentially of phosphoric acid and a liquid polyhydric alcohol, particularly a didhydric and/or trihydric alcohol. Exemplary polyhydric alcohols suitable for use in the process and compositions of the present invention include ethylene-glycol, dietryleneglycol, triethylene glycol, polyethylene glycol 400, 1,2- and 1,3- propylene glycol, 1,4- butanediol and glycerine.
Descriptors : *Patent applications, *Steel, *Adhesive bonding, Surface finishing, Preparation, Etching, Tensile strength, Shear properties, Stresses, Phosphoric acids, Ethanols, Epoxy resins, Structural properties, Flammability
Subject Categories : Metallurgy and Metallography
Distribution Statement : APPROVED FOR PUBLIC RELEASE