CN112658428A - Copper conduit flame brazing protective coating and protection method - Google Patents
Copper conduit flame brazing protective coating and protection method Download PDFInfo
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- CN112658428A CN112658428A CN202011473084.2A CN202011473084A CN112658428A CN 112658428 A CN112658428 A CN 112658428A CN 202011473084 A CN202011473084 A CN 202011473084A CN 112658428 A CN112658428 A CN 112658428A
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- protective coating
- copper
- flame brazing
- purified water
- soldering flux
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Abstract
A copper conduit flame brazing protective coating and a protection method are characterized in that the coating contains a soldering flux, absolute ethyl alcohol and purified water, the soldering flux contains 41% -43% of potassium fluoride, 34% -36% of boric anhydride and 21% -25% of potassium fluoborate, the soldering flux and the mixture of the absolute ethyl alcohol and the purified water are mixed in proportion to form the protective coating, the protective coating is uniformly coated on a copper conduit welding position and stands before the copper conduit flame brazing, the copper conduit is subjected to flame brazing after the protective coating is dried, and after the flame brazing is completed, residual coating on the welding position is cleaned by an organic solvent.
Description
Technical Field
The application relates to the technical field of flame brazing, in particular to a flame brazing protective coating for a copper conduit and a protection method.
Background
In the integrated assembly technology of the airplane, a fuel system, a hydraulic system, a power system and the like are installed, and the systems are provided with a copper guide pipe (material: T2-M) and a guide pipe component of a flat nozzle (material: HPb59-1) through flame brazing. The manufacturing process of the pipe assembly is strict, the flat pipe nozzle and the copper pipe are passivated and matched before welding, the pipe is inserted into the flat pipe nozzle, the gap between the flat pipe nozzle and the copper pipe is 0.03mm-0.15mm, and after flame brazing, the outer surface of the pipe is coated with primer and finish paint after being cleaned by organic solvent. During welding, because the brazing flame temperature (the flame brazing temperature can reach 3200 ℃) is higher, the copper guide pipe matrix of a welding joint and nearby parts is oxidized and carbonized to generate a blackening phenomenon; and the organic solvent is difficult to clean after welding, so that the binding force of the paint is low, the paint is dropped after the machine is installed, the surface of the part is exposed to be blackened, and the problem is brought to aircraft delivery. Therefore, how to improve the surface quality of the copper conduit in the flame brazing is an urgent technical problem to be solved in the production of airplanes.
Disclosure of Invention
In order to meet the requirements of aircraft development and production and the problems in the prior art, the application aims to provide a copper conduit flame brazing protective coating and a protection method.
The copper conduit flame brazing protective coating is characterized by comprising 41-43% of soldering flux, 34-36% of boric anhydride and 21-25% of potassium fluoborate, and the mixing ratio of the soldering flux to the absolute ethyl alcohol to the purified water is as follows: anhydrous ethanol: purified water 13:1: 7.
The present application also provides a method for flame brazing protection of copper ducts, characterized by comprising 1) applying the flame brazing protective coating for copper ducts of claim 1 to a substrate in the form of a flux: anhydrous ethanol: respectively weighing soldering flux, absolute ethyl alcohol and purified water according to the volume ratio of 13:1: 7; 2) firstly, mixing and stirring the measured purified water and the soldering flux uniformly in a vessel, and then pouring the measured absolute ethyl alcohol into the vessel to be mixed and stirred uniformly to form a protective coating; 3) before flame brazing of the copper guide pipe, uniformly brushing the protective coating on the welding part of the copper guide pipe and standing; 4) after the protective coating is dried, carrying out flame brazing on the copper conduit; 5) and cleaning residual paint at the welding position by using an organic solvent after flame brazing is finished.
The beneficial effect of this application lies in: the flame brazing protective coating of the formula protects the copper guide pipe from oxidation and carbonization during flame brazing, overcomes the defect of the flame brazing welding technology of the copper guide pipe of the domestic aviation system for decades, inhibits the probability of blackening of the copper guide pipe after brazing, improves the welding technical means, and solves the problem of low bonding force of the paint after welding. Can effectively take the process manufacturing cost and the product quality into consideration.
The present application is described in further detail below with reference to examples.
Detailed Description
The main components of the copper conduit flame brazing protective coating formula provided by the application are FB102 soldering flux, absolute ethyl alcohol and purified water, wherein the FB102 soldering flux can be sold in the market or prepared by self, and comprises 42% of potassium fluoride, 35% of boric anhydride and 23% of potassium fluoborate according to the mass percentage; the absolute ethyl alcohol and the purified water are purchased in the market. Formula (volume ratio) of copper conduit flame brazing protective coating, purified water: anhydrous ethanol: FB102 flux-7: 1: 13.
According to the protective coating preparation method, three glass measuring cups with scales are prepared for a laboratory according to the protective coating formula, the glass measuring cups are numbered respectively, purified water is measured by a first quantity, absolute ethyl alcohol is measured by a second quantity, FB102 soldering flux is measured by a third quantity, an open ceramic vessel is arranged, and a round-head glass stirring rod is arranged. According to the quantity of products in each production batch, in the first step, 13 parts of FB102 soldering flux is measured by a third glass measuring cup and poured into an open ceramic vessel; secondly, measuring 7 parts of purified water by using a first glass measuring cup, pouring the purified water into the FB102 soldering flux in the open ceramic ware along a glass rod, and uniformly stirring the purified water and the FB102 soldering flux by using the glass rod; and thirdly, measuring 1 part of absolute ethyl alcohol by using a second glass measuring cup, pouring the absolute ethyl alcohol into the mixture of the FB102 soldering flux and the purified water in the open ceramic ware along the glass rod, and uniformly stirring the mixture by using the glass rod.
When the protective paint is used, before welding, one industrial paint brush (brush) is prepared, the brush is used for dipping the prepared protective paint, the protective paint is uniformly brushed to the welding position of the copper guide pipe and the range of 50mm away from the welding seam position, after the coating is finished, the protective paint is kept stand for about 1 minute, after the protective paint is dried, welding is started, and after welding, the residual paint at the welding position is cleaned by an organic solvent.
Claims (3)
1. The copper conduit flame brazing protective coating is characterized by comprising 41-43% of soldering flux, 34-36% of boric anhydride and 21-25% of potassium fluoborate, and the mixing ratio of the soldering flux to the absolute ethyl alcohol to the purified water is as follows: anhydrous ethanol: purified water 13:1: 7. Before flame brazing of the copper guide pipe, uniformly brushing the protective coating on the welding part of the copper guide pipe and standing; 4) after the protective coating is dried, carrying out flame brazing on the copper conduit; 5) and cleaning residual paint at the welding position by using an organic solvent after flame brazing is finished.
2. A method for flame brazing protection of copper ducts, comprising 1) applying the flame brazing protective coating of claim 1 to a copper duct in the form of a flux: anhydrous ethanol: respectively weighing soldering flux, absolute ethyl alcohol and purified water according to the volume ratio of 13:1: 7; 2) firstly, mixing and stirring the measured purified water and the soldering flux uniformly in a vessel, and then pouring the measured absolute ethyl alcohol into the vessel to be mixed and stirred uniformly to form a protective coating; 3) before flame brazing of the copper guide pipe, uniformly brushing the protective coating on the welding part of the copper guide pipe and standing; 4) after the protective coating is dried, carrying out flame brazing on the copper conduit; 5) and cleaning residual paint at the welding position by using an organic solvent after flame brazing is finished.
3. The method for flame brazing a copper pipe according to claim 2, wherein in step 3), the protective coating is uniformly applied to both sides of the weld of the copper pipe within 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011473084.2A CN112658428A (en) | 2020-12-15 | 2020-12-15 | Copper conduit flame brazing protective coating and protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011473084.2A CN112658428A (en) | 2020-12-15 | 2020-12-15 | Copper conduit flame brazing protective coating and protection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112658428A true CN112658428A (en) | 2021-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011473084.2A Pending CN112658428A (en) | 2020-12-15 | 2020-12-15 | Copper conduit flame brazing protective coating and protection method |
Country Status (1)
| Country | Link |
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| CN (1) | CN112658428A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB768126A (en) * | 1953-10-15 | 1957-02-13 | Nat Res Dev | Brazing and fluxes therefor |
| CN102764939A (en) * | 2012-07-18 | 2012-11-07 | 熊进 | Alcohol-soluble copper soldering paste |
| CN102794582A (en) * | 2012-08-15 | 2012-11-28 | 北京工业大学 | Soldering flux matched with high-melting-point solder and preparation method thereof |
| CN103692112A (en) * | 2013-12-05 | 2014-04-02 | 四川达宇特种车辆制造厂 | Silver brazing flux suitable for carbon steel, stainless steel, copper and copper alloy |
| CN111151924A (en) * | 2020-01-15 | 2020-05-15 | 浙江新锐焊接科技股份有限公司 | Low-volatility environment-friendly acid-washing-free soldering flux solution and preparation method and application thereof |
-
2020
- 2020-12-15 CN CN202011473084.2A patent/CN112658428A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB768126A (en) * | 1953-10-15 | 1957-02-13 | Nat Res Dev | Brazing and fluxes therefor |
| CN102764939A (en) * | 2012-07-18 | 2012-11-07 | 熊进 | Alcohol-soluble copper soldering paste |
| CN102794582A (en) * | 2012-08-15 | 2012-11-28 | 北京工业大学 | Soldering flux matched with high-melting-point solder and preparation method thereof |
| CN103692112A (en) * | 2013-12-05 | 2014-04-02 | 四川达宇特种车辆制造厂 | Silver brazing flux suitable for carbon steel, stainless steel, copper and copper alloy |
| CN111151924A (en) * | 2020-01-15 | 2020-05-15 | 浙江新锐焊接科技股份有限公司 | Low-volatility environment-friendly acid-washing-free soldering flux solution and preparation method and application thereof |
Non-Patent Citations (3)
| Title |
|---|
| 周佩锋等: "《钎气焊工操作技术要领图解》", 31 March 2008, 济南：山东科学技术出版社 * |
| 美国金属学会: "《金属手册-焊接与钎焊》", 30 November 1984, 北京：机械工业出版社 * |
| 薛松伯等: "《中华人民共和国机械行业标准》", 1 July 1993 * |
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Application publication date: 20210416 |
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