A kind of water-soluble brazing flux for low-temperature soldering aluminum alloy and preparation method thereof

A water-soluble, soft soldering technology, applied in the direction of welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems that affect the quality of brazing, poor wettability of solder, and increase the difficulty of welding, etc., to achieve high activity and wettability Strong force and good film removal effect

Inactive Publication Date: 2020-09-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of poor wettability of solder in the existing aluminum brazing process, increasing welding difficulty, affecting brazing quality and high welding temperature, and provides a water-soluble flux for low-temperature brazing of soft aluminum alloys and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The brazing flux of the present invention is composed of ammonium fluoroborate, nano-zinc oxide, nano-tin oxide, cesium chloride, triethanolamine, absolute ethanol and isopropanol, and the mass percentages of its specific components are: ammonium fluoroborate 12%, nano-oxidized 12% zinc, 12% nano-tin oxide, 4% cesium chloride, 36% triethanolamine, and the rest is absolute ethanol.

[0022] A water-soluble brazing flux for low-temperature brazing of soft aluminum alloys and a preparation method thereof, the steps are as follows:

[0023] (1) Ammonium fluoroborate, nano-zinc oxide, nano-tin oxide, and cesium chloride are added to the triethanolamine solvent;

[0024] (2) Stir continuously at 150°C for 25 minutes to fully dissolve and mix the raw materials to obtain a mixed solution;

[0025] (3) After the mixed solution is cooled to 20°C, add absolute ethanol and stir evenly, then stand and filter to obtain the flux.

[0026] The particle size of the nano-zinc oxide and...

Embodiment 2

[0028] The brazing flux of the present invention is composed of ammonium fluoroborate, nano-zinc oxide, nano-tin oxide, cesium chloride, triethanolamine, absolute ethanol and isopropanol, and the mass percentage of its specific components is: ammonium fluoroborate 20%, nano-oxidized 18% zinc, 20% nano-tin oxide, 8% cesium chloride, 30% triethanolamine, and the rest is absolute ethanol.

[0029] A water-soluble brazing flux for low-temperature brazing of soft aluminum alloys and a preparation method thereof, the steps are as follows:

[0030] (1) Ammonium fluoroborate, nano-zinc oxide, nano-tin oxide, and cesium chloride are added to the triethanolamine solvent;

[0031] (2) Stir continuously at 180°C for 20 minutes to fully dissolve and mix the raw materials to obtain a mixed solution;

[0032] (3) After the mixed solution is cooled to 20°C, add absolute ethanol and stir evenly, then stand and filter to obtain the flux.

[0033] The particle size of the nano-zinc oxide and n...

Embodiment 3

[0035] The brazing flux of the present invention is composed of ammonium fluoroborate, nano-zinc oxide, nano-tin oxide, cesium chloride, triethanolamine, absolute ethanol and isopropanol, and the mass percentage of its specific components is: ammonium fluoroborate 20%, nano-oxidized 20% zinc, 18% nano-tin oxide, 8% cesium chloride, 30% triethanolamine, and the rest is absolute ethanol.

[0036] A water-soluble brazing flux for low-temperature brazing of soft aluminum alloys and a preparation method thereof, the steps are as follows:

[0037] (1) Ammonium fluoroborate, nano-zinc oxide, nano-tin oxide, and cesium chloride are added to the triethanolamine solvent;

[0038] (2) Stir continuously at 200°C for 25 minutes to fully dissolve and mix the raw materials to obtain a mixed solution;

[0039] (3) After the mixed solution is cooled to 20°C, add absolute ethanol and stir evenly, then stand and filter to obtain the flux.

[0040] The particle size of the nano-zinc oxide and n...

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PUM

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Abstract

The invention discloses a water solubility soldering flux used for low-temperature aluminum alloy soldering and a preparing method, and belongs to the technical field of aluminum alloy soldering. Theproblems that brazing filler metal in the existing aluminum soldering process is poor in wettability, welding difficulty is increased, soldering quality is affected, and welding application temperature is high are solved. The flux comprises, by mass percent, 10 to 20% of ammonium borofluoride, 10 to 20% of nano-zinc oxide, 10 to 20% of nanometer oxide tin, 2 to 8% of cesium chloride, 30 to 40% oftriethanolamine and the balance absolute ethyl alcohol. The selected nanometer material is high in activity, and wetting power, during aluminum brazing, the good film removal effect is achieved, and bright and saturated welding points are obtained. The water solubility soldering flux has the high adaptation to the existing process, most importantly, the soldering flux is water solubility solderingflux capable of being applied at the temperature ranging from 180 DEG C to 210 DEG C, and the method is high in flexibility and ideal in engineering meaning.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy soldering, and in particular relates to a water-soluble flux used for low-temperature soldering of soft aluminum alloys and a preparation method thereof. Background technique [0002] Today, under the constraints of traditional energy sources, environmental pollution and other factors, aluminum and aluminum alloys in LED packaging are gradually replacing copper in some industrial fields due to their advantages such as low density, high specific strength, high electrical conductivity and substantial cost reduction. However, because aluminum is relatively active, a layer of dense and chemically stable oxides is easy to form on its surface, which makes the wettability of the solder during brazing poor, increases the difficulty of welding, and affects the quality of brazing. So this is one of the main obstacles when brazing aluminum and aluminum alloys. For this reason, to overcome the above p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/363B23K103/10
CPCB23K35/3612B23K35/362
Inventor 丁敏冀志强李树勇马乐陆煜左为胡连海
Owner TAIYUAN UNIV OF TECH
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