Delustering agent for eliminating glossy of welding spots in soldering flux
A matting agent and flux technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve problems such as circuit board residue and circuit board insulation resistance drop
Active Publication Date: 2013-01-16
溧阳常大技术转移中心有限公司
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- Application Information
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Problems solved by technology
At present, some domestic flux manufacturers usually add long-chain fatty acids to the flux in order to achieve the purpose of extinction. However, the decomposition temperature of long-chain fatty acids is relatively high, and it is easy to remain on the circuit board, causing a decrease in the insulation resistance of the circuit board. In order to solve the above problems, the present invention provides the matting substance in the soldering flux that can eliminate the luster of solder joints. At the same time, for soldering materials, whether it is leaded solder or lead-free solder, it is applicable. Due to the addition of silanized nano-silica, the solder joints change from bright to matte without affecting the insulation of the circuit board. resistance
Method used
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Effect test
Embodiment 1-5
[0013] 63Sn / 37Pb (Sn63%, Pb37%) alloy solder was used, the flux was rosin-type flux, its composition is shown in Table 1, and the results of matting effect and insulation resistance are shown in Table 3.
Embodiment 6-10
[0015] 63Sn / 37Pb (Sn63%, Pb37%) alloy solder was used, and the flux was rosin-free. The composition is shown in Table 1, and the results of matting effect and insulation resistance are shown in Table 3.
Embodiment 11-15
[0017] Using Sn / 3Ag / 0.5Cu (Sn 96.5%, Ag 3% and Cu0.5%) alloy solder, the flux is rosin type flux, its composition is shown in Table 1, and the results of matting effect and insulation resistance are shown in Table 3 .
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Abstract
The invention discloses a delustering agent for eliminating the glossy of welding spots in scaling powder and relates to wave-soldering flux. In the invention, silanized silicon dioxide powder is added into the soldering flux, wherein the grain diameter of the added silicon dioxide powder is below 80nm and the addition amount (mass percentage concentration) is 0.001-0.1 percent. Welding spots welded by the soldering flux are converted into sub-gloss type from light type and the insulating resistance of the welded circuit board is not influenced at the same time.
Description
technical field [0001] The present invention is applicable to the field of assembly or packaging of integrated circuits, and in particular, relates to a method associated with flux and using flux, that is, in order to solder and assemble electronic components on a circuit board during wave soldering or manual soldering, The component in the flux used, and when this component is added to the flux, it has the function of eliminating the gloss of the solder joints. Background technique [0002] After assembling the electronic components on the printed circuit board, it is usually necessary to check whether the electronic components are well welded on the circuit board through appearance inspection equipment and visual inspection. Usually, the solder joints after welding are shiny. Therefore, when inspecting with appearance equipment, the misjudgment of the instrument is caused by the reflection of light, or when the inspector uses visual inspection, it will bring fatigue to peo...
Claims
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IPC IPC(8): B23K35/363
Inventor 陈智栋王文昌孔泳许娟曹剑瑜
Owner 溧阳常大技术转移中心有限公司