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Water soluble scaling powder core leadless solder wire

A technology of lead-free solder and flux, applied in the direction of welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of ozone layer destruction and waste pollution, and achieve simple process, good wettability, and soldering good sex effect

Inactive Publication Date: 2007-03-14
天津市宏远电子有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

CFC (trichlorotrifluoroethane) is generally used to clean electronic products after rosin core solder wire is soldered. During the cleaning process, the discharge of ionic substances into the atmosphere will seriously damage the ozone layer, and the waste will seriously pollute the environment.
Judging from the existing research results at home and abroad, the problem of water-soluble flux-cored lead-free solder wire has not yet been solved. Therefore, we start the development and research of this new material, which provides opportunities for me to develop innovative materials, and is beneficial to environmental safety and human body and mind. Feel gratified to be healthy and do more good things

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] Water Soluble Flux: TW 20 48% Coconut Oil 2% Citric Acid 4% Dibromosuccinic Acid 2% Deionized Water Balance.

[0038] Lead-free solder: Sn99.3% Cu0.7% Ni0.03% P0.005% The liquidus and solidus are 227°C.

example 2

[0040] Water Soluble Flux: TW 60 49% Peanut Oil 4% Hydroxysuccinic Acid 4% Dibromobutenediol 2% Deionized Water Balance.

[0041] Lead-free solder: Sn99.3% Cu0.7% Ni0.03% P0.005% The liquidus and solidus are 227°C.

[0042] The process flow of the lead-free solder wire

[0043] Lead-free solder smelting→ingot peeling→extrusion→wire drawing→winding

[0044] Preparation:

[0045]1. First heat a certain amount of tin to 600°C, then add a certain amount of tin-copper, tin-nickel and tin-phosphorus intermediate alloys and stir evenly, let stand and cool down to 400°C, keep warm for 0.5-1 hour to cast ingots.

[0046] 2. Inject water-soluble flux when extruding lead-free solder, and keep the pressure at 1Kg / cm 2 . The injection amount of water-soluble flux is 2-3%.

[0047] 3. Then draw the extruded wire rod to the required specification to start winding, and then pack it.

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PUM

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Abstract

The invention relates to a water-soluble welding flux leadless solder wire without, corrosion and bittern. Wherein, it is formed by Cu at 0.5-1, Ni at 0.02-0.1, P at 0.005-0.1, and the left is Sn. The invention has better welding quality, wetting property, bright crystal, better flow ability and better reliability.

Description

technical field [0001] The invention belongs to the technical field of welding of electronic information products, in particular to a water-soluble flux-cored lead-free solder wire. Background technique [0002] At present, in the electronics industry, manual soldering materials are used for electronic information products, which are generally active rosin-core tin-lead solder wires. Although the solder wire has the characteristics of excellent wettability, weldability, electrical conductivity and mechanical properties and low cost, the Pb contained in it or the substance containing Pb is a harmful and poisonous substance that endangers human physical and mental health and pollutes environmental sanitation. substance. With the improvement and strictness of environmental protection laws and regulations, the call for prohibiting the use of lead is increasing day by day. Japan, Europe and the United States have all formulated their own lead-free regulations and research. At t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/26B23K35/362
Inventor 严健张锡哲邱鹏
Owner 天津市宏远电子有限公司
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