Novel non-corrosion fluoride solder and preparation method

A non-corrosive, fluoride-free technology, applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve problems such as defects, and achieve the effect of good molding, low preparation process and raw material prices, and no impact on health

Inactive Publication Date: 2008-02-20
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The present invention provides a new type of non-corrosive fluoride brazing flux and its preparation method in order to solve the above-mentioned bad problems of the brazing properties of 6063 aluminum alloys commonly used at present by non-corrosive fluoride brazing flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Component formula: the components and content (by weight percentage) of flux are: neutral QF flux: 99.5%; ZnSiF 6 : 0.5%.

[0023] Preparation:

[0024] (1) Al(OH) of known composition 3 React with hot KOH solution to make KAlO 2 During the preparation process, the solution was neutralized by adding KOH dropwise, and the K at this time + / Al 3+ The ratio is exactly 1.9175;

[0025] (2) Add appropriate amount of HF to the solution obtained in step (1) for conversion, and then precipitate out KAlF 4 and K 3 AlF 6 mixture;

[0026] (3) Evaporate the mixture obtained in step (2) to dryness and bake at 200°C to remove a small amount of free acid, and then obtain a neutral QF flux.

[0027] (4) Combine neutral QF flux and ZnSiF 6 The powder is weighed and mixed according to the formula ratio;

[0028] (5) Place the mixed powder obtained in step (4) in a mortar and add an appropriate amount of distilled water to stir and grind until uniform;

[0029] (6) Insulate a...

Embodiment 2

[0032] Component formula: The components of the flux are proportioned by weight percentage: neutral QF flux: 99.7%; ZnSiF 6 : 0.3%.

[0033] Preparation method: same as the preparation method of Example 1.

Embodiment 3

[0035] Component formula: The components of the flux are proportioned by weight percentage: neutral QF flux: 99.0%; ZnSiF 6 : 1.0%.

[0036] Preparation method: same as the preparation method of Example 1.

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PUM

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Abstract

The present invention relates to a fluoride soldering flux without causticity of a soldering 6063 aluminum alloy and the method of preparation, which belongs to soldering material field of the aluminum and the aluminum alloy. The compounding ratio of the component by the weight percent is: the neutral QF soldering flux: 99.0 to 99.7 percent; ZnSiF6: 0.3 to 1.0 percent. The neutral QF soldering flux is prepared by adopting the chemical synthesis, and the ratio of K+/A13+ is 1.9175, and the melting point of the soldering flux is 560 DEG C, and the soldering temperature is 580 to 620 DEG C. The soldering flux protects the soldering 6063 aluminum alloy in the stove by cooperating the AI-11.7Si eutectic soldering material nitrogen gas. The length of the clearance with the same clearance of the soldering material is more than 160 mm. The obverse and inverse surfaces of the soldering clearance are of good shaping with even welding root, and have no disadvantages of air holes on the surface and claming dregs. The cutting intensity for the soldering is more than 120 MPa. The soldering flux preparation art and the material of the present invention have low price, and do not absorb the damp. The present invention does not loose the efficiency when stored in the atmosphere for a long time, which is suitable for being widely applied.

Description

technical field [0001] The invention relates to a novel non-corrosive fluoride brazing flux and a preparation method thereof, in particular to a brazing 6063 aluminum alloy containing ZnSiF 6 The invention discloses a non-corrosive fluoride brazing flux and a preparation method thereof, belonging to the field of brazing materials for aluminum and aluminum alloys. Background technique [0002] Due to their excellent physical and chemical properties, good processing, surface treatment and corrosion resistance, aluminum and aluminum alloys occupy a very important position in modern industrial materials and are widely used in aerospace, construction, electrical appliances, automobiles and ships. . It is also particularly important to realize the connection of aluminum and aluminum alloys. Non-corrosive fluoride flux used with Al-Si eutectic solder (KF-AlF 3 Eutectic flux, referred to as QF flux) was first developed by ALCAN company in Canada in the 1970s. Compared with chlori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363
Inventor 邹家生
Owner JIANGSU UNIV OF SCI & TECH
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