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Acid-cleaning avoid welding flux and preparation method thereof

A pickling-free and flux-free technology, applied in the fields of flux and brazing, to achieve the effects of reduced production costs, reduced process flow, and easy use

Inactive Publication Date: 2009-04-01
上海明煌实业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the GB102 brazing flux, fluorides (such as potassium fluoroborate, sodium, potassium fluoride, sodium, calcium, lithium, etc.) that have an ideal effect of activity and relatively no residue are added to the surface of the workpiece after brazing , has been greatly improved compared with the past, but the surface effect of the same workpiece under strong corrosion, after brazing, the fluoride covering the surface of the workpiece will soon appear "green" due to the combination of oxygen and water molecules in the air The patina, glassy residue can still be cleaned after pickling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 120g of boric acid (boric acid ≥ 99%, Shanghai Minghuang Industrial Development Co., Ltd.), add methanol 23.5g (methanol ≥ 97%), stir and heat, the temperature is controlled at 45 ° C ~ 50 ° C, the pressure is controlled at 1 Pa ~ 1.2 Pa, React for 1.5 hours, then weigh 25g of potassium permanganate and dissolve it completely with 200g of water, add it to the above reaction solution, continue to stir for half an hour, filter and wash until neutral to obtain 75g of pickling-free flux, and cycle at 100°C Bake in an oven for 2 hours, weigh 72.35 g, the content is 99%, and the yield is 72.0%.

Embodiment 2

[0024] The pickling-free flux containing 99% trimethyl borate prepared in Example 1 was prepared with 94% methanol to prepare pickling-free flux containing 10%, 37%, 40%, and 47% trimethyl borate respectively.

[0025] Dip the pickling-free flux prepared in Example 1 and the above-mentioned various preparations of the pickling-free flux with a brush, respectively, and apply them to the surface of the air-conditioning stop valve and the high-body valve of the copper workpiece respectively, and form a film after brazing The effect is good, no residue, under normal conditions, 24 hours, the workpiece does not appear corrosion. 7-30 days, there is still no corrosion on the workpiece.

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PUM

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Abstract

The invention provides a pickling-free flux, comprising 37-47% of trimethyl borate (by weight); preferably, the weight percentage of the trimethyl borate is 40%. The invention also provides a method used for preparing the pickling-free flux, comprising the steps as follows: under the conditions of temperature of 45-50DEG C, the pressure of 1Pa-1.2Pa and the catalyst of potassium permanganate, boracic acid and carbinol react completely, filtrated and washed to a neutral state, thus gaining the pickling-free flux; furthermore, the pickling-free flux is dried suitably. The pickling-free flux has simple and convenient usage, good film-forming effect, no residues after brazing and no corrosion phenomenon occurring on brazing workpiece, reduces the brazing cost, and protects the environment; the preparation method is simple and convenient and the gained product has high purity.

Description

technical field [0001] The invention relates to the technical field of brazing, in particular to the field of flux, in particular to a pickling-free flux and a preparation method thereof. Background technique [0002] In the traditional brazing process, flux has always played an important role, but in recent years, various manufacturing industries have developed rapidly, and the requirements for flux are also increasing. The GB102 flux that is still widely used at present originated from the former Soviet Union 40-50 In the early days of the development of brazing technology, people only required a good welding quality for industrial products in the 1990s. However, the local conditions and the requirements for "quality" still remained in whether the welding seam connected the two base metals met the requirements, but Today, more than half a century later, production has undergone tremendous changes, and people have stricter requirements on products. Not only must the welding...

Claims

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Application Information

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IPC IPC(8): B23K35/36B23K35/363C07F5/04
Inventor 王明德
Owner 上海明煌实业发展有限公司
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