Fluxless brazing
AssigneeDana Canada Corporation
InventorsKostas F. Dockus, Robert H. Krueger, Brian E. Cheadle, Mark S. Kozdras, Feng Liang
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Abstract
A method of manufacturing an article of manufacture for use in a fluxless brazing process is disclosed. The method comprises the step of applying a braze-promoting layer including one or more metals selected from the group consisting of nickel, cobalt and iron, onto a bonding layer which comprises one or more metals selected from the group consisting of zinc, tin, lead, bismuth, nickel, antimony and thallium and which is disposed on a substrate including aluminum.
Claims56
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising the steps of providing a substrate comprising aluminum;
- applying to the substrate a bonding, layer which comprises one or more metals selected from the group consisting of zinc, tin, lead, bismuth, nickel, antimony and thallium, and applying to the bonding layer a braze-promoting layer including one or more metals selected from the group consisting of nickel, cobalt and iron, the bonding layer and the substrate defining a target surface of the substrate at the junction therebetween.
A method of manufacturing an article of manufacture for use in an improved fluxless brazing process, the method comprising the steps of providing a substrate containing aluminum;
- plating a braze-promoting layer selected from the group consisting of nickel and cobalt onto the substrate, the junction of the braze-promoting layer and the substrate defining a target surface of the substrate;
- and prior to the step of plating the braze-promoting layer onto the substrate, mechanically abrading the substrate such that the target surface defines a plurality of reentrant edges.
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising the step of providing a substrate containing aluminum;
- electroplating a braze-promoting layer including one or more metals selected from the group consisting of nickel and cobalt onto the substrate, wherein the electroplating is carried out in an aqueous bath having a pH of from about 5 to 7 and including, in solution, said one or more metals.
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising the steps of providing a substrate containing aluminum;
- and electroplating a braze-promoting layer containing nickel onto the substrate, wherein the electroplating is carried out in an aqueous bath consisting of an aqueous solution of:
- from about 3 to about 20 weight percent of nickel sulfate;
- from about 3 to about 10 weight percent of nickel chloride;
- from about 6 to about 30 weight percent of a buffering salt selected from the group consisting of sodium citrate and sodium gluconate;
- from about 0.005 to about 1.0 weight percent of a lead salt selected from the group consisting of lead acetate and lead citrate;
- and
- ammonium,
- wherein the bath has a pH value in the range of about 3 to 12 and has a mole ratio of nickel:
- citrate:
- ammonium in solution of about 1:0.5-1.5:1-6.
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising the steps of providing a substrate containing aluminum;
- plating a braze-promoting layer containing nickel onto the substrate, wherein the electroplating is carried out in an aqueous bath consisting of an aqueous solution of nickel, citrate and ammonium, and wherein the plating bath has a pH value in the range of about 5 to 12 and has a mole ratio of nickel:
- citrate:
- ammonium in solution of about 1:0.5-1.5:1-6.
An article of manufacture for use in an improved fluxless brazing process, comprising a substrate containing aluminum;
- a bonding layer on the substrate selected from the group of metals consisting of zinc, tin, lead, bismuth, nickel, antimony and thallium;
- and a braze-promoting layer on the bonding layer, the braze-promoting layer being selected from the group consisting of nickel, cobalt and iron.
Dependencies are inferred from the claim text.