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Al and Al alloy soft braze welding metal displaced type unleaded welding soldering flux

A metal replacement, aluminum alloy technology, applied in metal processing equipment, welding medium, welding equipment and other directions, can solve the problem of not finding a solution to the wettability of tin to aluminum and aluminum alloy soldering, and failing to solve environmental problems, etc. The preparation method is simple and feasible, the welding strength is high, and the expansion rate is good.

Inactive Publication Date: 2008-06-25
昆山成利焊锡制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Looking at the fluxes for aluminum and aluminum alloy soldering at home and abroad, none of them solves the environmental protection problem, nor does it find a flux that solves the problem of good wettability of tin to aluminum and aluminum alloy soldering, and high tensile strength after welding.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Composition of the present invention and component weight percent are as follows:

[0025] Reducible Metal Salt Stannous Fluoborate 12%

[0026] Film remover Trihydroxyethylamine 28%

[0027] Wetting agent Potassium fluoroborate 15%

[0028] Activator Triethylamine hydrochloride 5%

[0029] Surfactant OP-10 5%

[0030] Corrosion Inhibitor 5-Benzyltetrazole 5%

[0031] Carrier polyethylene glycol 10000 30%

[0032] After mixing, heating and stirring according to the content of the above components, the system turns into a milky white paste after distillation and dehydration;

[0033] Its performance is tested, and the test results are: the expansion rate is 92%, and the tensile strength of the brazed joint is greater than 98N, which is higher than the strength (98N) of the aluminum wire itself.

[0034] Get 0.5g milky white paste among the embodiment 1 and put it on the aluminum plate of 25mm * 50mm * 1mm, take off after heating on the hot bath of 240 ℃ for 30 seco...

Embodiment 2

[0036] Composition of the present invention and component weight percent are as follows:

[0037] Reducible Metal Salt Stannous Fluoborate 8%

[0038] Zinc fluoroborate 5%

[0039] Film remover Trihydroxyethylamine 30%

[0040] Wetting agent ammonium fluoroborate 15%

[0041] Activator Cyclohexylamine Hydrobromide 5%

[0042] Surfactant brominated hexaalkylpyridine 5%

[0043] Corrosion inhibitor piperazine 4%

[0044]Carrier polyethylene glycol 20000 28%

[0045] After mixing, heating and stirring according to the content of the above components, the system turns into a milky white paste after distillation and dehydration;

[0046] Its performance is tested, and the test results are: the expansion rate is 92%, and the tensile strength of the brazed joint is greater than 98N, which is higher than the strength (98N) of the aluminum wire itself.

Embodiment 3

[0048] Composition of the present invention and component weight percent are as follows:

[0049] Reducible Metal Salt Stannous Fluoborate 8%

[0050] Zinc fluoroborate 5%

[0051] Film remover Dihydroxyethylamine 30%

[0052] Wetting agent Sodium fluoroborate 15%

[0053] Activator Triethylamine hydrochloride 5%

[0054] Surfactant FSN100 2%

[0055] Corrosion inhibitor Morpholine 5%

[0056] Carrier polyethylene glycol 100000 30%

[0057] After mixing, heating and stirring according to the content of the above components, the system turns into a milky white paste after distillation and dehydration;

[0058] Its performance is tested, and the test results are: the expansion rate is 93%, and the tensile strength of the brazed joint is greater than 98N, which is higher than the strength (98N) of the aluminum wire itself.

[0059] testing method:

[0060] 1. Expansion rate

[0061] Refer to the test method of 5.8 expansion rate in the national stan...

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Abstract

The invention discloses a soldering metal replacement no lead welding scaling powder for aluminum and aluminum alloy, which is composed of the following weight proportions: 5 to 50 percent of metal salt that can be reduced by the aluminum, 10 to 15 percent of stripper, 3 to 40 percent of wetting agent, 3 to 20 percent of activating agent, 1 to 15 percent of surface active agent, 2 to 20 percent of inhibiter and a carrier with the rest percent. The invention has an extremely excellent matching effect with a lead-free solder in the welding temperature and is suitable for being made into a welding stick or a welding paste with the lead-free solder. After welding, the invention has a high welding intensity and a good expansion rate, belongs to an environment protection scaling powder, and has the function of inhibition protection on the aluminum and aluminum alloy as well as a simple and practical preparing method. Undoubtedly, the embodiment can also be used for the no lead soldering on the materials like stainless steel, galvanized iron, copper and copper alloy, etc., and bear the same effects as well.

Description

Technical field: [0001] The invention is a flux suitable for lead-free soldering of aluminum and aluminum alloys in electronic equipment such as electrical appliances, instruments, communications, and electric light sources, as well as radiators, condensers, and heat dissipation pipes made of aluminum and aluminum alloys; The flux of the present invention is also suitable for lead-free soldering of materials such as stainless steel, galvanized iron, nickel alloy, copper and copper alloy. Background technique: [0002] Traditional metal soldering is to use flux to remove oxides on the surface of the metal substrate during heating and welding, and the molten tin solder and the metal from which oxides have been removed form intermetallic compounds through physical adsorption and chemical adsorption, so that the tin solder Weld together with the metal being welded. Flux with good performance can increase the fluidity (wetting performance) of solder, increase the soldering area ...

Claims

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Application Information

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IPC IPC(8): B23K35/363
Inventor 苏明斌谢明贵苏传港苏燕旋苏传猛晏和刚
Owner 昆山成利焊锡制造有限公司
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