Method of brazing an aluminum material

Details Method of brazing an aluminum material Method of brazing an aluminum material

1984-10-10

1986-10-28

Rosenberg, Peter D.

Metal treatment

Compositions

Fluxing

228223, B23K 3534

Patent

active

046197168

ABSTRACT:
In a method of brazing aluminum material, the flux is formed on the surface of the aluminum material by a chemical conversion coating step. The aluminum material is brought into contact with a treating solution containing potassium and fluorine ions to cause a chemical reaction between aluminum components and potassium and fluorine ions, thereby forming K.sub.2 AlF.sub.5. The K.sub.2 AlF.sub.5 is present on the surface of the aluminum material as a uniform coating and acts as the flux during brazing. With the treating solution further containing zinc, the flux of K.sub.2 AlF.sub.5 and a pitting corrosion inhibiting layer of metallic zinc are simultaneously formed. The treating solution may further include powdered K.sub.2 AlF.sub.5 or AlF.sub.3 to increase the amount of flux and thus to intensify the action of the flux. The chemical conversion coating may be applied either to the material to be brazed or to the material for brazing.

REFERENCES:
patent: 3951328 (1976-04-01), Wallace
patent: 4070192 (1978-01-01), Arbib
patent: 4224086 (1980-09-01), Stokes

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