Method for forming a conversion layer on an aluminum alloy...

Details Method for forming a conversion layer on an aluminum alloy... Method for forming a conversion layer on an aluminum alloy...

2011-01-25

2011-01-25

King, Roy (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S243000, C148S528000, C219S615000, C219S085100, C219S085200, C228S208000, C228S209000, C228S262510, C428S385000

Reexamination Certificate

active

07875129

ABSTRACT:
A method of assembling aluminum alloy products, such as sheets, strips or tubes, by means of fluxless brazing, where the absence of flux is made possible by using a prior treatment resulting in formation of a conversion layer on the surface of the products. The treatment involves using a solution containing K+and F−ions and at least one acid in a quantity such that the pH of the solution is less than 3. The inventive method enables effective flux was brazing in industrial conditions, such as a for the production of heat exchangers used in motor vehicles.

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