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A special solder paste for aluminum welding and its preparation method and use method

A solder paste, aluminum technology, applied in welding equipment, welding media, welding/cutting media/materials, etc., can solve the problems of weak solder joints, poor diffusion, affecting welding firmness, etc., to enhance the firmness of solder joints , excellent fatigue characteristics, beneficial to anti-corrosion effect

Active Publication Date: 2020-04-28
中山翰华锡业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After several months of welding aluminum components, the phenomenon of loose solder joints and component detachment is prone to occur naturally, and the above problems are more likely to occur if they are subjected to external forces
The main reasons for weak solder joints include: the poor diffusion between metal tin and aluminum, the solder paste and aluminum components are difficult to fuse for a long time; the surface of aluminum has a stable oxide film, which is difficult to destroy during welding, and the oxide film will affect The firmness of welding

Method used

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  • A special solder paste for aluminum welding and its preparation method and use method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invention provides a special solder paste for welding aluminum materials. The solder paste is composed of the following components in weight percent: 84% solder powder, 11% flux, 3% 2-octyldodecanol, tallow diamine diol Salt 2%;

[0032] The solder powder is composed of the following components by weight percentage: Zn 3.2%, Bi 1.6%, In 0.7%, Ga0.4%, Sb 0.2%, Ru 0.1%, and the balance is Sn;

[0033] The flux is composed of the following components in weight percentage: 40% maleic rosin, 20% diethylene glycol butyl ether acetate, 10% 2-methyl-2,4-pentanediol, 10% malonic acid , behenic acid 5%, lithium magnesium silicate 8%, coco monoethanolamide polyoxyethylene ether 2%, cetearyl glucoside 2%, o-tert-butyl hydroquinone 2%, butyl Hydroxyanisole 1%.

[0034] A preparation method of special solder paste for aluminum welding, comprising the following steps;

[0035] (1) Weigh the raw material components of the flux according to the formula ratio, mix malea rosin, die...

Embodiment 2

[0043] A special solder paste for aluminum material welding, the solder paste is composed of the following components in weight percentage: 86% of solder powder, 10% of flux, 2% of 2-amino-2-methyl-1-propanol, polypropylene Acyldimethylammonium taurate 2%;

[0044] The solder powder is composed of the following components by weight percentage: Zn 4.0%, Bi 2.0%, In 1.0%, Ga0.6%, Sb 0.3%, Ru 0.2%, and the balance is Sn;

[0045]The flux is composed of the following components in weight percent: 25% maleic rosin pentaerythritol ester, 20% maleic rosin glyceride, 18% 2-ethyl-1,3-hexanediol, 14% dipropylene glycol dimethyl ether %, 7% tartaric acid, 6% phthalic acid, 3% organic bentonite, 2% hydrogenated castor oil, 2% methyl glucose polyoxyethylene ether, 1% isostearamidopropyl morpholine lactate, Tributylcatechol 2%.

[0046] A preparation method of special solder paste for aluminum welding, comprising the following steps;

[0047] (1) Weigh the flux raw material components ac...

Embodiment 3

[0055] A special solder paste for aluminum welding, the solder paste is composed of the following components by weight percentage: 89% solder powder, 8% solder flux, 3% cocoyl glutamic acid triethanolamine salt;

[0056] The solder powder is composed of the following components by weight percentage: Zn 4.8%, Bi 2.4%, In 1.3%, Ga0.8%, Sb 0.5%, Ru 0.3%, and the balance is Sn;

[0057] The soldering flux is composed of the following components in weight percent: maleated rosin 20%, maleated rosin pentaerythritol ester 20%, maleated rosin glyceride 10%, diethylene glycol butyl ether acetate 10%, ethylene glycol mono Butyl ether 10%, 2-ethyl-1,3-hexanediol 10%, oxalic acid 5%, fumaric acid 3%, itaconic acid 2%, fumed silica 2.5%, polyamide wax 2.5%, coconut Oil-based monoethanolamide polyoxyethylene ether 2%, hydrogenated castor oil polyoxypropylene ester 2%, ethoxyquinoline 1%.

[0058] A preparation method of special solder paste for aluminum welding, comprising the following st...

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Abstract

The invention discloses soldering paste special for aluminum material soldering and a preparation method and a using method thereof. The soldering paste is prepared from, by weight, 84-89% of solder powder, 8-12% of scaling powder and 2-5% of a dispersing agent. The solder powder is prepared from, by weight, 3.2-4.8% of Zn, 1.6-2.4% of Bi, 0.7-1.3% of In, 0.4-0.8% of Ga, 0.2-0.5% of Sb, 0.1-0.3% of Ru and the balance Sn. The scaling powder is prepared from, by weight, 40-50% of a main material, 20-35% of a solvent, 8-16% of an activating agent, 4-8% of a thixotropic agent, 2-4% of a surfactantand 1-3% of antioxidant. The soldering paste has excellent tin soldering performance, welding spots are full, bright and firm, and lead is not used, so that safety and environment protection are achieved.

Description

[0001] field of invention [0002] The invention belongs to the technical field of welding materials, and in particular relates to a special solder paste for welding aluminum materials and a preparation method and application method thereof. Background technique [0003] Solder paste is a new type of soldering material that accompanies SMT. Solder paste is a complex system, which is a paste mixture formed by mixing solder powder, flux and other surfactants, thixotropic agents, etc. Solder paste has a certain viscosity at room temperature, which can initially stick electronic components to a predetermined position. At the soldering temperature, with the volatilization of solvents and some additives, the soldered components and printed circuit pads are welded together to form Permanent connection. [0004] In recent years, with the rapid development of the welding industry, the types of solder paste have also increased. However, the solder paste currently used for aluminum we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/26B23K35/40B23K1/00
CPCB23K1/00B23K1/0008B23K35/262B23K35/40
Inventor 龙斌马鑫万国晖周建李爱良童桂辉丁灿谭利梅李义成
Owner 中山翰华锡业有限公司
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