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.
Claims30
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising:
- (a) providing a substrate containing aluminum;
- (b) applying to the substrate a bonding layer which comprises ions of one or more metals selected from the group consisting of zinc, tin, lead, bismuth, nickel, antimony and thallium;
- and
- (c) electroplating a braze-promoting layer onto said bonding layer, said braze-promoting layer comprising one or more metals selected from nickel and cobalt;
- wherein the electroplating is carried out in an aqueous bath having a pH of from about 2 to 7 and including, in solution, ions of said one or more metals, citrate ion and ammonium ion, wherein the mole ratio of metal ions:
- citrate ion:ammonium ion in solution is about 1:0.5 to 1.5:1 to 6;
- wherein application of the bonding layer is preceded by or concurrent with a brush cleaning of the substrate such that the target surface defines a plurality of reentrant edges;
- and
- wherein the brush cleaning is effected through nylon or stainless steel brushes.
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising:
- (a) providing a substrate containing aluminum;
- and
- (b) electroplating a braze-promoting layer onto said substrate, said braze-promoting layer comprising nickel;
- wherein the electroplating is carried out in an aqueous bath comprising nickel ion, ammonium ion and boric acid, wherein the pH of the bath is between 2 and 7.
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising:
- (a) providing a substrate containing aluminum;
- (b) applying to the substrate a bonding layer which comprises one or more metals selected from the group consisting of lead, bismuth, nickel, antimony and thallium;
- and
- (c) electroplating a braze-promoting layer onto said bonding layer, said braze-promoting layer comprising nickel;
- wherein the electroplating is carried out in an aqueous bath comprising nickel ion and ammonium ion in solution and further comprising boric acid.
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising:
- (a) providing a substrate containing aluminum;
- and
- (b) electroplating a braze-promoting layer onto said substrate, said braze-promoting layer comprising nickel;
- wherein the electroplating is carried out in an aqueous bath comprising nickel ion and ammonium ion in solution, and further comprises EDTA as a nickel chelating agent.
A method of manufacturing an article of manufacture for use in a fluxless brazing process, the method comprising:
- (a) providing a substrate containing aluminum, the substrate having a target surface;
- (b) applying to the target surface a bonding layer which comprises one or more metals selected from the group consisting of zinc, tin, lead, bismuth, nickel, antimony and thallium;
- and
- (c) electroplating a braze-promoting layer onto said bonding layer, said braze-promoting layer comprising nickel;
- wherein application of the bonding layer is concurrent with mechanical abrasion of 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:
- (a) providing a substrate containing aluminum, the substrate having a target surface;
- (b) mechanically abrading the target surface of the substrate so that the target surface defines a plurality of reentrant edges;
- and
- (c) electroplating a braze-promoting layer onto said mechanically-abraded target surface;
- wherein the mechanical abrasion comprises a brush cleaning of the surface using nylon or stainless steel brushes.
Dependencies are inferred from the claim text.