# US 11,440,143 B2 · Flux composition for brazing aluminum and method for brazing aluminum using the same

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- Number: US 11,440,143 B2
- Document ID: US11440143B2
- Status: Granted
- Kind: B2
- Application number: 16/204,555
- Filed: 2018-11-29
- Published: 2020-04-16
- Granted: 2022-09-13
- Earliest claimed: 2018-10-10
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Chang Yeol Yoo
- Web page: https://patentgrep.com/patent/US11440143B2

## CPC

- B23K 35/362: Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence)
- B23K 35/3602: {Carbonates, basic oxides or hydroxides}
- B23K 2103/10: Aluminium or alloys thereof
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

Disclosed are a composition for brazing aluminum, and a method for brazing aluminum using the same. The composition for brazing aluminum may have excellent adhesion or bonding strength and improved corrosion resistance, for example, after bonding. The composition for brazing aluminum may include an amount of about 30 to 60 parts by weight of a zinc-based compound, and an amount of about 10 to 40 parts by weight of a metal titanium. For example, by using the composition for brazing aluminum in, base metals may be bonded by applying and heat treating the flux without addition of separate filler metal, thereby simplifying a bonding process and reducing a bonding time.

## Claims

### Claim 1

A composition for brazing aluminum, consisting of
an amount of 30 to 60 parts by weight of a zinc-based compound,
an amount of 10 to 40 parts by weight of a metal titanium (Ti), and
an amount of 10 to 40 parts by weight of a fluorinated aluminate, based on 100 parts by weight of the composition,
wherein the zinc-based compound is one or more selected from the group consisting of zinc oxide (ZnO), zinc oxide (Zn2O), and zinc carbonate (ZnCO3).

### Claim 2 (depends on 1)

The composition of claim 1, wherein the fluorinated aluminate is represented by following Chemical Formula 1:
KxAlyFz,
wherein in the Chemical formula 1, x is in a range of 1 to 6, y is in a range of 1 to 6, z is in a range of 1 to 6, and x+y:z is in a range of 1:0.1 to 1:3.

### Claim 3 (depends on 2)

The composition of claim 2, wherein the fluorinated aluminate is one or more selected from the group consisting of KAlF, KAlF4, and K3AlF6.

### Claim 4 (depends on 1)

A method for brazing aluminum, comprising
applying the composition of claim 1 on an aluminum base material, and
heat-treating the composition.

### Claim 5 (depends on 4)

The method of claim 4, wherein the heat treating is performed at a temperature of 350 to 600° C.

### Claim 6 (depends on 1)

An aluminum article comprising one or more parts, wherein a connection part between the one or more parts comprises the composition of claim 1.

### Claim 7 (depends on 6)

A vehicle comprising the aluminum article of claim 6.

### Claim 8

A composition for brazing aluminum, consisting of
an amount of 30 to 60 parts by weight of a zinc-based compound,
an amount of 10 to 40 parts by weight of a metal titanium (Ti), and
an amount of 10 to 40 parts by weight of a fluorinated aluminate, based on 100 parts by weight of the composition, and
an amount of 5 wt % or less of a filler metal based on 100% by weight of the dried composition for brazing aluminum,
wherein the zinc-based compound is one or more selected from the group consisting of zinc oxide (ZnO), zinc oxide (Zn2O), and zinc carbonate (ZnCO3).

### Claim 9 (depends on 8)

The composition of claim 8, wherein a content of the filler metal is less than or equal to 2 wt % based on 100% by weight of the dried composition for brazing aluminum.

### Claim 10 (depends on 8)

The composition of claim 8, wherein the filler metal is one or more selected from the group consisting of an Ag-based filler metal; Cu-based or a Brass-based filler metal; an Al-based filler metal; a CuP-based filler metal; a Ni-based filler metal; an Au-based filler metal; and a Pd-based filler metal.

### Claim 11 (depends on 8)

The composition of claim 8, wherein the filler metal is one or more selected from the group consisting of Si, Cu, Mg, Sn, Bi, Pb, Ag, Ni, and La.

### Claim 12 (depends on 8)

The composition of claim 8, wherein a particle size of the filler metal is in a range of 10 to 200 μm.