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):

Report Date:

1982-06-24

Pagination or Media Count:

7.0

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 andor 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.

Subject Categories:

  • Metallurgy and Metallography
  • Fabrication Metallurgy
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE