Stainless steel surface treatment

Details Stainless steel surface treatment Stainless steel surface treatment

1993-05-03

1994-01-04

Powell, William

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

134 3, 134 28, 134 40, 134 41, 156629, 156645, 156651, 252 792, 252 793, B44C 122, C23F 100

Patent

active

052756963

ABSTRACT:
A process for preparing a stainless steel surface for bonding to an adhes 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-.degree.F. to 145-.degree.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.

REFERENCES:
patent: 3280038 (1966-10-01), Morris
patent: 3598741 (1971-08-01), Kanno
patent: 4610798 (1986-09-01), Burkus
patent: 5108544 (1992-04-01), Hakansson
patent: 5185057 (1993-02-01), Playdon

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