Soldering flux in use for iron weldment

A technology of flux and weldment, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of tin connection, exposed base material, virtual soldering, etc., and achieve easy cleaning and bright lead-tin coating Effect

Active Publication Date: 2004-10-27
SHENZHEN BEIJIA ELECTRONICS MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the general flux has been decomposed and invalidated above 330°C, and there is no effective method of wet tinning for the iron port of the pin, and a large amount of exposed base material, virtual soldering, tin connection, etc. phenomenon, and the iron port can not be tinned at all; although some special resin fluxes are suitable for this process, on the one hand, the use of such fluxes must be cleaned with saponifier and freon after dipping, which will cause serious damage to the environment. Pollution, on the other hand, due to its strong activity, sometimes the lead-tin alloy protective layer will be corroded and blued

Method used

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  • Soldering flux in use for iron weldment

Examples

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Effect test

Embodiment 1

[0023] Embodiment 1: a kind of flux that is used for ferrous weldment, its component and content are:

[0024] o-Chlorophenylacetic acid 30 g / L;

[0025] Glycolic acid 2% (volume);

[0026] Propylene glycol modified polymer 8% (volume);

[0027] Molecular weight is 35% (volume) of fatty alcohol polyoxyethylene ether of 60,000;

[0028] The remainder is propylene glycol.

Embodiment 2

[0029] Embodiment 2: a kind of flux that is used for ferrous weldment, its component and content are:

[0030] p-Hydroxyphenylacetic acid 20 g / L;

[0031] Acetic acid 1% (volume);

[0032] Propylene glycol modified polymer 5% (volume);

[0033] Molecular weight is 20% (volume) of fatty alcohol polyoxyethylene ether of 40,000;

[0034] The rest is isopropanol.

Embodiment 3

[0035] Embodiment 3: a kind of flux that is used for ferrous weldment, its component and content are:

[0036] Isophthalic acid 50 g / l;

[0037] Acetic acid 5% (volume);

[0038] Propylene glycol modified polymer 10% (volume);

[0039] Molecular weight is 50% (volume) of fatty alcohol polyoxyethylene ether of 40,000;

[0040] The remainder is propylene glycol.

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Abstract

A flux for the iron workpiece to be soldered contains organic acid type activating agent, low-molecular organis monoacid type coactivating agent, propanediol modified polymer, emtrol polyoxyvinylether, and low-carbon alcohol type solvent. Its highest soldering temp is 450 deg.C. It is suitable for coating Pb-Sn alloy on the pins of electromagnetic element.

Description

technical field [0001] The invention relates to the flux used in the welding process of ferrous materials, in particular to a flux used for ferrous weldments with high activation temperature. Background technique [0002] The prior art involves a lead-tin alloy protective layer on the pins of electromagnetic components. During the manufacturing process, a layer of insulating varnish must be pre-coated on the pins. This layer of insulating varnish can generally withstand high temperatures of about 380 ° C. This layer of insulating varnish must be removed before the lead-tin alloy to expose the metal material of the pin (the inner rod and port are made of iron, and the outer layer is nickel-plated). The process is as follows: the component pins are first ironed off the insulating varnish in a lead-tin alloy furnace above 380°C, then coated with flux on the pins, and then put into the lead-tin alloy furnace for dip soldering. In the prior art, the general soldering flux has be...

Claims

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Application Information

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IPC IPC(8): B23K35/36B23K35/362B23K35/365
Inventor 李荣荆文丽刘洪黄盛文
Owner SHENZHEN BEIJIA ELECTRONICS MATERIAL
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