Surface preparation of nickel base alloys for brazing

Details Surface preparation of nickel base alloys for brazing Surface preparation of nickel base alloys for brazing

C - Chemistry, Metallurgy

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C

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C23C 8/12 (2006.01) B23K 1/20 (2006.01) B23K 35/00 (2006.01) C23G 1/19 (2006.01) C23G 1/20 (2006.01) C23G 1/32 (2006.01) C25F 1/04 (2006.01) C25F 1/12 (2006.01)

Patent

CA 1251380

-18- ABSTRACT A method is disclosed for the removal of undesirable oxides from the surface of nickel-base or nickel-iron base alloys containing oxidizable aluminum and/or titanium prior to brazing. The alloy is heated in air at an elevated temperature for a time sufficient to form on the alloy surface a bilayered film comprised of a first oxide top layer containing at least titanium or aluminum and a second layer beneath the first comprised of the alloy composition substantially depleted of aluminum and/or titanium. The surface of the alloy is cleaned to remove the first oxide layer whereupon the remaining surface is in condition for brazing.

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