Abstract: An aluminum alloy for flux-free brazing provided for brazing performed via an Al—Si-based brazing material without a flux in a non-oxidizing atmosphere without depressurization, includes: by mass %, 0.01% to 2.0% of Mg; and 0.005% to 1.5% of Bi, wherein in the aluminum alloy, there are more than 10 Mg—Bi-based compounds having a diameter of 0.01 ?m or more and less than 5.0 ?m in terms of equivalent circle diameter per 10,000-?m2 visual field and there are less than 2 Mg—Bi-based compounds having a diameter of 5.0 ?m or more per 10,000-?m2 visual field in a cross section parallel to a rolling direction, and in the aluminum alloy, there are less than 5 Bi particles having a diameter of 5.0 ?m or more in terms of equivalent circle diameter per 10,000-?m2 visual field in the cross section parallel to the rolling direction.

Abstract: An aluminum alloy brazing sheet may include a sacrificial material having a function of a brazing material on at least one surface of a core material, wherein the sacrificial material has a composition containing: in a mass %, 2% to 5% of Si; 3% to 5% of Zn; and an Al balance with inevitable impurities the core material is made of an Al—Mn-based alloy, an in the core material before brazing, Al—Mn based secondary particles having an equivalent circle diameter of 100 to 400 nm are distributed with a number density of 0.3 to 5 particles/?m2.

Abstract: The aluminum alloy clad material includes a core material and sacrificial materials disposed on both surfaces of the core material, the composition of the core material contains, by mass %, Mn: 0.7% to 1.8%, Si: 0.3% to 1.3%, Fe: 0.05% to 0.7% and Zn: 0.5% to 3.0% with a remainder consisting of Al and inevitable impurities, the composition of the sacrificial material contains, by mass %, Mn: 0.005% to 0.7%, Fe: 0.05% to 0.3% and Zn: 1.0% to 4.0% with a remainder consisting of Al and inevitable impurities, an amount of Zn in the sacrificial material is larger than an amount of Zn in the core material by 0.2% or more, and the potential of the core material after a brazing heat treatment is within a range of ?700 to ?870 mV.

Abstract: An aluminum brazing sheet has a multilayer structure of two or more layers of at least a core material and a brazing material, wherein an Al—Si—Mg—Bi-based brazing material containing, by mass %, 0.01% to 2.0% of Mg, 1.5% to 14.0% of Si, and 0.005% to 1.5% of Bi is clad on one surface or both surfaces of the core material to be located at an outermost surface of the aluminum brazing sheet, in the Al—Si—Mg—Bi based brazing material, there are more than 10 Mg—Bi-based compounds having a diameter of 0.01 ?m or more and less than 5.0 ?m when observed in a surface layer plane direction and there are less than 2 Mg—Bi-based compounds having a diameter of 5.0 ?m or more, and in the brazing material, there are less than 5 Bi particles having a diameter of 5.0 ?m or more when observed in the surface layer plane direction.

Abstract: An aluminum alloy for flux-free brazing provided for brazing performed via an Al-Si-based brazing material without a flux in a non-oxidizing atmosphere without depressurization, includes: by mass %, 0.01% to 2.0% of Mg; and 0.005% to 1.5% of Bi, wherein in the aluminum alloy, there are more than 10 Mg-Bi-based compounds having a diameter of 0.01 ?m or more and less than 5.0 ?m in terms of equivalent circle diameter per 10,000-?m2 visual field and there are less than 2 Mg-Bi-based compounds having a diameter of 5.0 ?m or more per 10,000-?m2 visual field in a cross section parallel to a rolling direction, and in the aluminum alloy, there are less than 5 Bi particles having a diameter of 5.0 ?m or more in terms of equivalent circle diameter per 10,000-?m2 visual field in the cross section parallel to the rolling direction.

Abstract: An aluminum alloy brazing sheet may include a sacrificial material having a function of a brazing material on at least one surface of a core material, wherein the sacrificial material has a composition containing: in a mass %, 2% to 5% of Si; 3% to 5% of Zn; and an Al balance with inevitable impurities the core material is made of an Al—Mn-based alloy, an in the core material before brazing, Al—Mn based secondary particles having an equivalent circle diameter of 100 to 400 nm are distributed with a number density of 0.3 to 5 particles/?m2.

Abstract: A sacrificial material on one surface of a core material, a Al brazing material containing Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and Al balance and satisfying (Bi+Mg)×Sr?0.1 is disposed on the other surface, Mg—Bi-based compounds of the brazing material with a diameter of 0.1-5.0 ?m are more than 20 per 10,000-?m2 and the Mg—Bi-based compounds with a diameter of 5.0 ?m or more are less than 2 before brazing, the core material contains Mn: 1.0% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.08% to 1.0%, Mg: 0.1% to 0.7%, and Al balance, the sacrificial material contains Zn: 0.5% to 6.0% and Mg of which a content is limited to 0.1% or less, and a Mg concentration on a surface of the sacrificial material after brazing is 0.15% or less.

Abstract: An aluminum alloy clad material includes: a sacrificial material on one surface of a core material; and an Al—Si—Mg—Bi-based brazing material disposed on other surface of the core material, contains, by mass %, Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and a balance consisting of Al and inevitable impurities, and satisfies a relationship of (Bi+Mg)×Sr?0.1 by mass %, in which Mg—Bi-based compounds contained in the Al—Si—Mg—Bi-based brazing material with a diameter of 0.1 ?m or more and less than 5.0 ?m are more than 20 in number per 10,000-?m2 and the Mg—Bi-based compounds with a diameter of 5.0 ?m or more are less than 2 in number, and the core material contains Mn: 0.9% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.08% to 1.0%, and a balance consisting of Al and inevitable impurities.

Abstract: An Al—Si—Mg—Bi-based brazing material containing Si: 6.0% to 14.0%, Fe: 0.05% to 0.3%, Mg: 0.02% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and a balance of Al and inevitable impurities, and satisfies (Bi+Mg)×Sr?0.1, is disposed on both surfaces of a core material, Mg—Bi-based compounds of the brazing material with a diameter of 0.1 ?m or more and less than 5.0 ?m in terms of equivalent circle diameter are more than 20 in number in 10,000 ?m2 and the Mg—Bi-based compounds with diameter of 5.0 ?m or more are less than 2 in number in 10,000 ?m2, the core material contains Mn: 0.8% to 1.8%, Si: 0.01% to 1.0%, Fe: 0.1% to 0.5%, and a balance of Al and inevitable impurities, and a cathode current density of a brazing material layer after a brazing heat treatment is 0.1 mA/cm2 or less.

Abstract: An aluminum alloy fin material for a heat exchanger in the present invention comprises an aluminum alloy having a composition containing Mn: 1.2 to 2.0%, Cu: 0.05 to 0.20%, Si: 0.5 to 1.30%, Fe: 0.05 to 0.5%, and Zn: 1.0 to 3.0% by mass and a remainder comprising Al and an unavoidable impurity, further containing one or two or more of Ti: 0.01 to 0.20%, Cr: 0.01 to 0.20% and Mg: 0.01 to 0.20% by mass as desired, and, after heating in brazing, has a tensile strength of 140 MPa or more, a proof stress of 50 MPa or more, an electrical conductivity of 42% IACS or more, an average grain diameter of 150 ?m or more and less than 700 ?m, and a potential of ?800 mV or more and ?720 mV or less.

Abstract: Provided is an aluminum alloy fin stock for a heat exchanger which is free from brazing defects due to fin deformation during brazing and is excellent in strength, electric conductivity, corrosion resistance, and brazability, and a heat exchanger. An aluminum alloy fin stock for a heat exchanger is made of an aluminum alloy having a composition including, by mass %, Mn: 1.2% to 2.0%, Si: 0.5% to 1.3%, Cu: 0.001% to less than 0.05%, Fe: 0.1% to 0.5%, Zn: 0.5% to 2.5%, and a balance consisting of Al and inevitable impurities, in which, at a room temperature after brazing heating, the aluminum alloy fin stock has a tensile strength of 140 MPa or more, a 0.2% proof stress of 50 MPa or more, a electric conductivity of 42% IACS or more, an electric potential of ?800 mV or more and ?710 mV or less, and a corrosion weight loss of 120 mg/dm2 or less after 16 weeks in a neutral salt spray test.

Abstract: An aluminum alloy clad material having four layers includes: a sacrificial material on one surface of a core material; and an Al—Si—Mg—Bi-based brazing material which clads the other surface thereof on one surface of the sacrificial material on an opposite side to the core material, the brazing material containing Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and Al balance, and satisfying (Bi+Mg)×Sr?0.1, Mg—Bi-based compounds contained in the brazing material with a diameter of 0.1-5.0 ?m are more than 20 in number per 10,000-?m2 and the Mg—Bi-based compounds with a diameter of 5.0 ?m or more are less than 2 before brazing, and the core material contains Mn: 1.0% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.1% to 0.7%, and a balance consisting of Al and inevitable impurities.

Abstract: An aluminum alloy clad material includes: a sacrificial material on one surface of a core material; and an Al—Si—Mg—Bi-based brazing material disposed on other surface of the core material, contains, by mass %, Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and a balance consisting of Al and inevitable impurities, and satisfies a relationship of (Bi+Mg)×Sr?0.1 by mass %, in which Mg—Bi-based compounds contained in the Al—Si—Mg—Bi-based brazing material with a diameter of 0.1 ?m or more and less than 5.0 ?m are more than 20 in number per 10,000-?m2 and the Mg—Bi-based compounds with a diameter of 5.0 ?m or more are less than 2 in number, and the core material contains Mn: 0.9% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.08% to 1.0%, and a balance consisting of Al and inevitable impurities.

Abstract: An Al—Si—Mg—Bi-based brazing material containing Si: 6.0% to 14.0%, Fe: 0.05% to 0.3%, Mg: 0.02% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and a balance of Al and inevitable impurities, and satisfies (Bi+Mg)×Sr?0.1, is disposed on both surfaces of a core material, Mg—Bi-based compounds of the brazing material with a diameter of 0.1 ?m or more and less than 5.0 ?m in terms of equivalent circle diameter are more than 20 in number in 10,000 ?m2 and the Mg—Bi-based compounds with diameter of 5.0 ?m or more are less than 2 in number in 10,000 ?m2, the core material contains Mn: 0.8% to 1.8%, Si: 0.01% to 1.0%, Fe: 0.1% to 0.5%, and a balance of Al and inevitable impurities, and a cathode current density of a brazing material layer after a brazing heat treatment is 0.1 mA/cm2 or less.

Abstract: A sacrificial material on one surface of a core material, a Al brazing material containing Si: 6.0% to 14.0%, Mg: 0.05% to 1.5%, Bi: 0.05% to 0.25%, Sr: 0.0001% to 0.1%, and Al balance and satisfying (Bi+Mg)×Sr?0.1 is disposed on the other surface, Mg-Bi-based compounds of the brazing material with a diameter of 0.1-5.0 ?m are more than 20 per 10,000-?m2 and the Mg-Bi-based compounds with a diameter of 5.0 ?m or more are less than 2 before brazing, the core material contains Mn: 1.0% to 1.7%, Si: 0.2% to 1.0%, Fe: 0.1% to 0.5%, Cu: 0.08% to 1.0%, Mg: 0.1% to 0.7%, and Al balance, the sacrificial material contains Zn: 0.5% to 6.0% and Mg of which a content is limited to 0.1% or less, and a Mg concentration on a surface of the sacrificial material after brazing is 0.15% or less.

Abstract: An aluminum alloy fin material and a heat exchanger having excellent moldability, strength, resistance to brazing erosion and durability are provided. The aluminum alloy fin material has a composition comprising, in % by mass, Zr: 0.05 to 0.3%, Mn: 1.8 to 2.5%, Si: 0.7 to 1.3%, Fe: 0.05 to 0.5%, Cu: 0.25 to 0.7%, Zn: 2.0 to 5.0%, with the balance being Al and inevitable impurities, wherein a ratio of Mn/Si in terms of content is in a range of 1.5 to 2.9, and the aluminum alloy fin material has a tensile strength before brazing of 210 to 280 MPa, a tensile strength after brazing of 175 MPa or more, an electrical conductivity after brazing of 37% IACS or more, and a solidus temperature of 605° C. or more, and has a crystal grain structure before brazing of a non-recrystallized grain structure, and has an average crystal grain size in a rolled surface after brazing of 300 ?m to 2,000 ?m.

Abstract: An aluminum alloy fin material and a heat exchanger having excellent moldability, strength, resistance to brazing erosion and durability are provided. The aluminum alloy fin material has a composition comprising Mn: 1.8 to 2.5%, Si: 0.7 to 1.3%, Fe: 0.05 to 0.3%, Cu: 0.14 to 0.30%, Zn: 1.3 to 3.0%, with the balance being Al and inevitable impurities, wherein a ratio Mn/Si in terms of content is in a range of 1.5 to 2.9, and the aluminum alloy fin material has a solidus temperature of 610° C. or more, a tensile strength before brazing of 220 to 270 MPa, has a crystal grain structure before brazing of a non-recrystallized grain structure, and has a tensile strength after brazing of 160 MPa or more, an electrical conductivity after brazing of 40% IACS or more and an average crystal grain size in a rolled surface after brazing of 300 ?m to 2,000 ?m.

Abstract: The present invention relates to an aluminum alloy brazing sheet with a thickness of 0.30 nm or less, including: a core material; a sacrificial material cladding one surface of the core material; and a brazing material cladding the other surface of the core material, in which the core material is made of A1—Mn—Si-based aluminum alloy containing by mass %, Cu: 0.5 to 1.3%, the sacrificial material is made of aluminum alloy containing, by mass %, Zn: 4.0 to 7.0%, the brazing material is made of aluminum alloy containing, by mass %, Si: 6.0 to 11.0% and Zn: 0.1 to 3.0%, in a pitting potential after brazing beat treatment, a thickness of a region in which a potential difference from the noblest potential in the core material is 100 mV or more is 10% to 50% of the thickness of the brazing sheet.

Abstract: The present invention relates to an aluminum alloy brazing sheet with a thickness of 0.30 nm or less, including: a core material; a sacrificial material cladding one surface of the core material; and a brazing material cladding the other surface of the core material, in which the core material is made of A1—Mn—Si-based aluminum alloy containing by mass %, Cu: 0.5 to 1.3%, the sacrificial material is made of aluminum alloy containing, by mass %, Zn: 4.0 to 7.0%, the hrazing material is made of aluminum alloy containing, by mass %, Si: 6.0 to 11.0% and Zn: 0.1 to 3.0%, in a pitting potential after brazing beat treatment, a thickness of a region in which a potential difference from the noblest potential in the core material is 100 mV or more is 10% to 50% of the thickness of the brazing sheet.

Abstract: An aluminum alloy fin material for a heat exchanger in the present invention comprises an aluminum alloy having a composition containing Mn: 1.2 to 2.0%, Cu: 0.05 to 0.20%, Si: 0.5 to 1.30%, Fe: 0.05 to 0.5%, and Zn: 1.0 to 3.0% by mass and a remainder comprising Al and an unavoidable impurity, further containing one or two or more of Ti: 0.01 to 0.20%, Cr: 0.01 to 0.20% and Mg: 0.01 to 0.20% by mass as desired, and, after heating in brazing, has a tensile strength of 140 MPa or more, a proof stress of 50 MPa or more, an electrical conductivity of 42% IACS or more, an average grain diameter of 150 ?m or more and less than 700 ?m, and a potential of ?800 mV or more and ?720 mV or less.