Novel insoluble aluminum brazing flux without corrosion and preparation method thereof

A non-corrosion, aluminum brazing flux technology, applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of poor wettability of solder, increase the difficulty of welding, affect the quality of brazing, etc., to achieve good wettability, Effect of improving brazing performance

Inactive Publication Date: 2009-07-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the ability to remove the oxide film on the surface of the brazing metal and the liquid solder, protect the brazing metal and the solder from being oxidized during the heating process, and solve the poor wettability of the solder during the brazing process and increase the difficulty of welding. Problems Affecting Brazing Quality

Method used

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  • Novel insoluble aluminum brazing flux without corrosion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Selection of raw materials

[0039] Raw materials; 98% potassium fluoride, 99% aluminum fluoride, 99% cesium fluoride, 40% fluosilicic acid and 40% hydrofluoric acid.

[0040] (2) Synthesis of aluminum flux

[0041] Weigh 50.5 grams of 99% aluminum fluoride, add 1 kg of water and stir for 0.5 hours, then slowly add 58 ml of 40% hydrofluoric acid, stir for 2 hours, then add 44.8 grams of 98% potassium fluoride, stir for 2 hours , then add 1 gram of 99% cesium fluoride, stir and react for 2 hours, finally add 40% of 2.5 grams of fluorosilicic acid, stir and react for 2 hours, and then let it stand for 24 hours to synthesize a product containing a new type of insoluble non-corrosive aluminum flux .

[0042] (3) Post-processing of the product

[0043] The above synthesized product containing the novel insoluble non-corrosion aluminum brazing flux is centrifugally dehydrated and dried until the water content in the aluminum brazing flux product is 2%, then crushed and...

Embodiment 2

[0046] (1) Selection of raw materials

[0047] Raw materials; 98% potassium hydroxide, 99% aluminum hydroxide, 99% cesium hydroxide, 40% fluosilicic acid and 40% hydrofluoric acid.

[0048] (2) Synthesis of aluminum flux

[0049] Weigh 54.5 grams of 99% aluminum hydroxide, add 1 kg of water and stir for 0.5 hours, then slowly add 138 milliliters of 40% hydrofluoric acid, stir and react for 2 hours, then add 46.8 grams of 98% potassium hydroxide and stir for 2 hours, Then add 0.5 g of 99% cesium hydroxide, stir and react for 2 hours, finally add 40% of 1.25 g of fluosilicic acid, stir and react for 2 hours, then let it stand for 24 hours to synthesize a product containing a new type of insoluble non-corrosion aluminum flux.

[0050] (3) Post-processing of the product

[0051] The above synthesized product containing the novel insoluble non-corrosion aluminum brazing flux is centrifugally dehydrated and dried until the water content in the aluminum brazing flux product is 2%, ...

Embodiment 3

[0054] (1) Selection of raw materials

[0055] Raw materials; 98% potassium oxide, 99% aluminum oxide, 99% cesium oxide, 40% fluosilicic acid and 95% hydrogen fluoride gas. Because the raw material is 95% anhydrous hydrogen fluoride gas, it is necessary to pass 95% hydrogen fluoride gas into water to reach 40% hydrofluoric acid.

[0056] (2) Synthesis of aluminum flux

[0057] Weigh 52.5 grams of 99% alumina, add 1 kg of water and stir for 0.5 hours, add 138 milliliters of 40% hydrofluoric acid, stir for 2 hours, then add 45.8 grams of 98% potassium oxide, stir for 2 hours, then add 99 % cesium hydroxide 0.5 g, stirred and reacted for 2 hours, finally added 40% of 1.25 g of fluosilicic acid, stirred and reacted for 2 hours, and left standing for 24 hours to synthesize a product containing a new type of insoluble non-corrosive aluminum flux.

[0058] (3) Post-processing of the product

[0059] The above synthesized product containing the novel insoluble non-corrosion aluminu...

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Abstract

The invention relates to novel insoluble non-corrosive aluminum soldering flux and a preparation method thereof, belongs to insoluble non-corrosive aluminum soldering flux and preparation technology thereof, and in particular to insoluble non-corrosive aluminum soldering flux containing a potassium composition, an aluminum composition, a cesium composition, a silicon composition and a fluorine composition and preparation thereof. The insoluble non-corrosive aluminum soldering flux solves the problems of poor wettability of solder, increase of the welding difficulty and influence of the braze welding quality during braze welding because aluminum is active and compact and stable oxide is easy to form on the surface of the solder. The preparation method adopts a technical proposal that the preparation method comprises the following steps: firstly, making the aluminum composition react with hydrofluoric acid, and adding the potassium composition and the cesium composition in turn; secondly, adding hydrofluosilicic acid into the mixture for reaction after the reaction is over; and thirdly, performing dehydration, drying, crushing and sieving through 20 mu m sieve, and preparing the insoluble non-corrosive aluminum soldering flux. The insoluble non-corrosive aluminum soldering flux has the advantages of convenient use, protection of brazing metals and the solder from being continuously oxidized during heating, improvement of the wettability of the solder on the surfaces of substrate metals, promotion of flowing of the solder, filling of joint gaps, formation of braze welding seams with clean and compact surfaces, and the like, and can be widely applied to braze welding of aluminum workpieces and aluminum alloy workpieces.

Description

technical field [0001] The new insoluble non-corrosion aluminum flux is applied to the brazing of aluminum workpieces. It belongs to a new type of insoluble non-corrosion aluminum flux and its preparation technology, especially involving potassium, aluminum, cesium, silicon, and fluorine. Insoluble non-corrosion aluminum flux and preparation. Background technique [0002] When brazing aluminum and aluminum alloys, the flux used initially is corrosive, which affects the quality of brazing. In the 1960s, non-corrosive insoluble flux (non-corrosive insoluble flux, referred to as Nocolok flux) was developed. Due to its wide use, in the application of materials in recent years, many workpieces have a tendency to replace copper with aluminum. Nocolok flux is a flux containing molten salts of potassium, aluminum, and fluorine. [0003] However, because aluminum is relatively active, a layer of dense and chemically stable oxides is easy to form on its surface, which makes the wet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363
Inventor 张韵慧张则甡晋兴华李芃张崧
Owner TIANJIN UNIV
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