CN1743510A - Aviation pipe internal surface chemical corrosion method - Google Patents
Aviation pipe internal surface chemical corrosion method Download PDFInfo
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- CN1743510A CN1743510A CN 200510057300 CN200510057300A CN1743510A CN 1743510 A CN1743510 A CN 1743510A CN 200510057300 CN200510057300 CN 200510057300 CN 200510057300 A CN200510057300 A CN 200510057300A CN 1743510 A CN1743510 A CN 1743510A
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- corrosive fluid
- aviation pipe
- aviation
- acid
- internal surface
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
Abstract
This invention discloses a chemical etching method to the internal surfaces of aerospace tubes, which inlets flow acid corrosion solution into the tube and puts it in a hot water-bath reacting for 20~100min. The condition includes: composition of the corrosion solution: HNO3 8-25%, HC5-20%, HF2-10%, the flow: 0.1~1.0cum/h water-bath temperature: 50-95deg.C reaction time: 20-100min. This invention applies a mixed acid in certain concentration and processes it in a flow way to dissolve the part with not qualified intercrystalline corrosion so as to eliminate the quality- hidden trouble.
Description
Technical field
The present invention relates to the treatment process of metallic surface, be specifically related to aviation pipe internal surface chemical corrosion method.
Background technology
Flourish along with national defense industry, the development of particularly space flight, aviation and nuclear energy leading-edge field, the usage quantity of aviation pipe increases day by day.The aviation pipe belongs to the long product of hi-tech and life cycle, and is very high to its specification of quality, therefore to the control of its production process particularly important that just seems.The production of aviation pipe generally is multi-pass, and is wherein rolling, and---pickling moves in circles in degreasing---thermal treatment---.After rolling (drawing) processing, appearance can be adhered to greasy dirt in the steel pipe, is difficult to remove totally, especially internal surface.And the carburizing phenomenon can take place in these greasy dirts when high-temperature heat treatment, thereby the intergranular corrosion that causes product is defective, and then influences final product quality.Therefore, in the production of aviation pipe, must adopt an effective measure, eliminate the aviation pipe internal surface intergranular corrosion and do not conform to compartment, can guarantee the surface quality of aviation pipe.
The aviation pipe is stainless steel or high-temperature alloy steel, its corrosion resistance nature extra-heavy.Aviation pipe its surface when rolling and thermal treatment can produce the oxidation firecoat in addition, and this oxide skin is removed and contained iron protoxide (FeO), Z 250 (Fe
3O
4) and ferric oxide (Fe
2O
3) outside, generally also contain chromium sesquioxide (Cr
2O
3) and spinel (FeOCr
2O
3), even and these oxide compounds also are insoluble to single mineral acids such as sulfuric acid, hydrochloric acid or nitric acid under the high temperature more than 80 ℃, handle very difficulty fully.Therefore, handling the aviation pipe internal surface problem is that affiliated technical field personnel are seeking the difficult problem that solves always.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide the method for mass defects such as underproof part of a kind of effective processing aviation pipe internal surface intergranular corrosion and oxidation firecoat, i.e. aviation pipe internal surface chemical corrosion method.
The object of the present invention is achieved like this: aviation pipe internal surface chemical corrosion method is to feed mobile mixing acid etching solution in the aviation pipe, and places hot water bath, reacts to get final product in 20～100 minutes.
Further concrete method is: a Lower tank is connected with recycle pump by pipeline with a header tank, is communicated with formation one with the aviation pipe by pipeline between header tank and the Lower tank and circulates closed circuitly, circulating is connected with acid etching solution in closed circuit; The aviation pipe is put into the corrosive fluid of tank by hot water bath indirect heating aviation pipe, and corrosive fluid is at a certain temperature with pipe internal surface intergranular corrosion underproof part generation chemical reaction and with its dissolving.
Treatment condition are the corrosive fluid composition: nitric acid 8～25%, hydrochloric acid 5～20%, hydrofluoric acid 2～10%; Corrosive fluid flow velocity: 0.1～1.0m
3/ h; Bath temperature: 50～95 ℃; Reaction times: 20～100 minutes.
The preferably treatment condition is the corrosive fluid composition: nitric acid 16%, hydrochloric acid 10%, hydrofluoric acid 5%; Corrosive fluid flow velocity: 0.2m
3/ L; Bath temperature: 70～85 ℃; Reaction times: 40～60 minutes.
Aviation pipe of the present invention can adopt the serial or parallel connection mode, also can adopt the series-parallel connection mode, and is promptly in parallel with at least 2 groups again after at least 2 series connection.
The present invention adopts certain density mixing acid, and adopts flow pattern to handle, and is partly dissolved the aviation pipe internal surface intergranular corrosion is underproof, thereby eliminates the quality product hidden danger that causes because of intergranular corrosion is defective.Also can improve simultaneously other defective of aviation pipe internal surface, as burr, fly skin etc., make its internal surface smooth smooth, be beneficial to down carrying out smoothly of operation.
Description of drawings
Fig. 1 is the process flow sheet of the inventive method.
Embodiment
Referring to Fig. 1, a Lower tank is connected with recycle pump by pipeline with a header tank, header tank and Lower tank are communicated with formation one circulation by pipeline with the aviation pipe closed circuit, and whole flow sheet equipment can closely be equipped with.The aviation pipe is put into the corrosive fluid of tank by hot water bath indirect heating aviation pipe, and corrosive fluid also dissolves with the underproof part generation of pipe internal surface intergranular corrosion chemical reaction at a certain temperature, thereby makes its internal surface smooth smooth.
Corrosive fluid composition of the present invention also can be:
| Nitric acid | Hydrochloric acid | Hydrofluoric acid | Water | |
| Prescription 1 | 16％ | 10％ | 5％ | Surplus |
| Prescription 2 | 8％ | 20％ | 3％ | Surplus |
| Prescription 3 | 25％ | 5％ | 10％ | Surplus |
| Prescription 4 | 20％ | 15％ | 3％ | Surplus |
| Prescription 5 | 18％ | 8％ | 8％ | Surplus |
Corrosive fluid can use repeatedly by adding new acid solution, till concentration of metal ions reaches certain limit.And can pass through Wet-process metallurgy method, separation and Extraction valuable metal ions wherein, the back up to standard discharging in the waste lye that produces with the necessary degreasing process of aviation pipe production then, and can not cause environmental pollution.
Example 1: 25 * 4,24 of aviation pipe (1Cr18Ni9Ti) Φ, internal diameter is 16.92-17.04mm, is divided into two groups, 6 every group, adopt the series-parallel connection mode to connect, promptly per 6 are connected into one group, then with two groups of parallel connections.
Treatment condition: the corrosive fluid that adopts prescription 1; Corrosive fluid flow velocity: 0.2m
3/ L;
Bath temperature: 70-80 ℃; Reaction times: 50 minutes.
Result: the aviation bore increases to 17.25-17.48mm, and is qualified through the check intergranular corrosion.
Example 2: 38 * 3,16 of aviation pipe (1Cr18Ni9Ti) Φ, internal diameter is 31.95-32.04mm, is divided into two groups, 8 every group, adopt the series-parallel connection mode to connect, promptly per 8 are connected into one group, then with two groups of parallel connections.
Treatment condition: the corrosive fluid that adopts prescription 2; Corrosive fluid flow velocity: 0.2m
3/ L;
Bath temperature: 80-85 ℃; Reaction times: 60 minutes.
Result: the aviation bore increases to 32.30-32.45mm, and is qualified through the check intergranular corrosion.
Utilize described prescription to be not difficult to select differing temps and time to handle according to content those skilled in the art disclosed by the invention and can reach similar effects.Innovative point of the present invention is to handle underproof part of aviation pipe internal surface intergranular corrosion and oxidation firecoat etc. by the mixing acid etching solution that flows, also heats.From above example as can be seen, wet processing technology of the present invention can solve the product quality problem that the aviation pipe causes because of intergranular corrosion is defective effectively, and have that technology is simple, processing ease, advantage such as pollution-free.
Claims (5)
1, aviation pipe internal surface chemical corrosion method is characterized in that comprising:
Will be in the aviation pipe feed the mobile acid etching solution, and place hot water bath to react to get final product in 20～100 minutes.
2, chemical corrosion method according to claim 1 is characterized in that: concrete steps are that a Lower tank is connected with recycle pump by pipeline with a header tank, are communicated with formation one closed cycle with the aviation pipe by pipeline between header tank and the Lower tank; Circulate and be connected with acid etching solution in closed circuit; The aviation pipe is put into the corrosive fluid of tank by hot water bath indirect heating aviation pipe, and corrosive fluid is at a certain temperature with pipe internal surface intergranular corrosion underproof part generation chemical reaction and with its dissolving.
3, chemical corrosion method according to claim 1 and 2 is characterized in that: treatment condition are the corrosive fluid composition: nitric acid 8～25%, and hydrochloric acid 5～20%, hydrofluoric acid 2～10%, all the other are water; Corrosive fluid flow velocity: 0.1～1.0m
3/ h; Bath temperature: 50～95 ℃; Reaction times: 20～100 minutes.
4, chemical corrosion method according to claim 3, it is characterized in that: treatment condition are the corrosive fluid composition: nitric acid 16%, hydrochloric acid 10%, hydrofluoric acid 5%; Corrosive fluid flow velocity: 0.2m
3/ L; Bath temperature: 70～85 ℃; Reaction times: 40～60 minutes.
5, caustic solution according to claim 4 is characterized in that: the aviation pipe can adopt the serial or parallel connection mode, also can adopt the series-parallel connection mode, and is promptly in parallel with at least 2 groups again after at least 2 series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100573004A CN100371500C (en) | 2005-09-28 | 2005-09-28 | Aviation pipe internal surface chemical corrosion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100573004A CN100371500C (en) | 2005-09-28 | 2005-09-28 | Aviation pipe internal surface chemical corrosion method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1743510A true CN1743510A (en) | 2006-03-08 |
| CN100371500C CN100371500C (en) | 2008-02-27 |
Family
ID=36139028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100573004A Expired - Fee Related CN100371500C (en) | 2005-09-28 | 2005-09-28 | Aviation pipe internal surface chemical corrosion method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100371500C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522035A (en) * | 2011-12-31 | 2012-06-27 | 中北大学 | Temperature control circulation etching processing device for circuit boards |
| CN109852971A (en) * | 2018-12-06 | 2019-06-07 | 北京动力机械研究所 | A kind of 3D printing high temperature alloy pipeline inner surface chemical polishing device and method |
| CN115873600A (en) * | 2022-11-28 | 2023-03-31 | 武汉高芯科技有限公司 | Opening corrosive liquid and opening method for cadmium telluride/zinc sulfide double-layer passive film |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1006001B (en) * | 1984-07-16 | 1989-12-06 | 菲利蒲(北美)有限公司 | Two-step electrochemical and chemical etching method of hish voltage aluminium anode foil |
| US6194032B1 (en) * | 1997-10-03 | 2001-02-27 | Massachusetts Institute Of Technology | Selective substrate metallization |
| US6150269A (en) * | 1998-09-11 | 2000-11-21 | Chartered Semiconductor Manufacturing Company, Ltd. | Copper interconnect patterning |
-
2005
- 2005-09-28 CN CNB2005100573004A patent/CN100371500C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522035A (en) * | 2011-12-31 | 2012-06-27 | 中北大学 | Temperature control circulation etching processing device for circuit boards |
| CN109852971A (en) * | 2018-12-06 | 2019-06-07 | 北京动力机械研究所 | A kind of 3D printing high temperature alloy pipeline inner surface chemical polishing device and method |
| CN115873600A (en) * | 2022-11-28 | 2023-03-31 | 武汉高芯科技有限公司 | Opening corrosive liquid and opening method for cadmium telluride/zinc sulfide double-layer passive film |
| CN115873600B (en) * | 2022-11-28 | 2024-05-07 | 武汉高芯科技有限公司 | Punching corrosive liquid and punching method for cadmium telluride/zinc sulfide double-layer passivation film |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100371500C (en) | 2008-02-27 |
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Granted publication date: 20080227 Termination date: 20120928 |