Accession Number : ADD016135

Title :   Stainless Steel Surface Treatment.

Descriptive Note : Patent, Filed 3 May 93, patented 4 Jan 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Gaskin, Georgette B ; Pilla, Gabriel J ; Brown, Stanley R ; Bonk, Robert B

Report Date : 04 Jan 1994

Pagination or Media Count : 3

Abstract : A process for preparing a stainless steel surface for bonding to an adhesive is described. First, the surface is wiped with a solvent and then soaked in an alkaline bath at an elevated temperature to remove dirt and grease. The surface is then rinsed with water and immersed in a 135 deg F. to 145 deg F. solution containing from 25 to 35 volume-percent sulfuric acid in water for a period of time equal to the length of time it takes for a reaction on the surface to commence plus about 4 to 8 minutes. Next, the surface is immersed in a solution at ambient temperature containing from 28 to 35 volume-percent nitric acid and from 2 to 3 volume-percent hydrofluoric acid in water for about 4 to 8 minutes, and then rinsed with water and dried.

Descriptors :   *STAINLESS STEEL, *PATENTS, *ADHESIVE BONDING, BATHS, BONDING, GREASES, HYDROFLUORIC ACID, LENGTH, NITRIC ACID, SOLVENTS, SULFURIC ACID, SURFACES, TEMPERATURE, TIME, VOLUME, WATER, SOLVENTS

Subject Categories : Metallurgy and Metallography
      Physical Chemistry
      Inorganic Chemistry
      Adhesives, Seals and Binders

Distribution Statement : APPROVED FOR PUBLIC RELEASE