CN103160843A - Process for removing welding stopping agent in TC4 titanium alloy superplastic forming - Google Patents
Process for removing welding stopping agent in TC4 titanium alloy superplastic forming Download PDFInfo
- Publication number
- CN103160843A CN103160843A CN2013100743457A CN201310074345A CN103160843A CN 103160843 A CN103160843 A CN 103160843A CN 2013100743457 A CN2013100743457 A CN 2013100743457A CN 201310074345 A CN201310074345 A CN 201310074345A CN 103160843 A CN103160843 A CN 103160843A
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- China
- Prior art keywords
- titanium alloy
- superplastic forming
- alloy superplastic
- stopping agent
- solder flux
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000003466 welding Methods 0.000 title abstract 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 27
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 10
- 235000010288 sodium nitrite Nutrition 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 claims description 25
- 229910000679 solder Inorganic materials 0.000 claims description 25
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 235000021110 pickles Nutrition 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 238000003672 processing method Methods 0.000 claims description 8
- 239000003513 alkali Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004140 cleaning Methods 0.000 abstract description 5
- 239000011159 matrix material Substances 0.000 abstract description 4
- 238000005554 pickling Methods 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 3
- 238000005406 washing Methods 0.000 abstract 2
- 238000003915 air pollution Methods 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 238000005498 polishing Methods 0.000 abstract 1
- 238000005488 sandblasting Methods 0.000 abstract 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 13
- 238000009792 diffusion process Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a process for removing a welding stopping agent in TC4 titanium alloy superplastic forming, which comprises the following steps: 1) immersing a TC4 titanium alloy superplastic forming member in alkali wash water at the temperature of 140-170 DEG C for washing for 1-4 hours, wherein the alkali wash water contains 500-700g/L of sodium hydroxide and 150-250g/L of sodium nitrite; 2) removing from the alkali wash water, washing the alkali wash water by clear water, then placing the TC4 titanium alloy superplastic forming member in a pickling solution, cleaning for 1-4 minutes at the room temperature, removing and then cleaning by water and then drying, wherein the pickling solution contains nitric acid concentration greater than 10g/L and less than or equal to 90g/L, and 300-450g/L of nitric acid concentration. The process for removing the welding stopping agent in TC4 titanium alloy superplastic forming can effectively remove the welding stopping agent, has no damage on a TC4 titanium alloy matrix, dust air pollution is not generated, compared with sand blasting and mechanical polishing, a lot of time can be saved, and the member surface effect is good.
Description
Technical field
The present invention relates to a kind of TC4 titanium alloy and end solder flux removal method at superplastic forming.
Background technology
TC4 titanium alloy material superplastic forming/diffusion transom adopts the gas pressurization diffusion to connect, member and cavity surface close contact, and frictional force is larger, for making distortion evenly, adopt lubricant, makes with lubricator to help the member demoulding; Also applied simultaneously diffusion pressure in non-diffusion joining region, for preventing that these non-spreading areas are diffused in connection, also should coat the only solder flux of isolation and lubrication, only solder flux is combined with matrix firmly, be difficult for removing, use mechanical grinding, cut basically easily occurs, easily hurt with the blast way and do not have the only matrix position of solder flux, and these two kinds of methods relatively waste time and energy.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of TC4 titanium alloy superplastic forming that does not damage TC4 titanium alloy superplastic formation spare matrix to end solder flux and remove processing method.
For achieving the above object, the technical solution used in the present invention is:
TC4 titanium alloy superplastic forming is ended solder flux and is removed processing method, and method is as follows:
1) TC4 titanium alloy superplastic formation spare is immersed in alkaline wash, 140 ~ 170 ℃ of temperature, clean 1 ~ 4 h, alkaline wash is sodium hydroxide and Sodium Nitrite mixed aqueous solution, wherein contains sodium hydroxide 500 ~ 700 g/L, Sodium Nitrite 150 ~ 250 g/L;
2) take out from alkaline wash after, wash alkaline wash with clear water, then TC4 titanium alloy superplastic formation spare is put into pickle solution, at room temperature clean 1 ~ 4min, after taking out, water cleans, dries up, pickle solution is the mixed aqueous solution of hydrofluoric acid and nitric acid, 10 g/L＜hydrofluoric acid concentration≤90 g/L wherein, concentration of nitric acid 300 ~ 450 g/L.
Beneficial effect of the present invention: with the only solder flux in chemical process removal TC4 titanium alloy superplastic forming, the parameters such as the concentration by controlling alkaline wash and pickle solution, temperature, time, can effectively remove only solder flux, do not damage the TC4 titanium alloy substrate, do not have the dust atmospheric pollution, trough washery liquid is safeguarded simple, and can simultaneously a lot of TC4 titanium alloy superplastic forming parts be put into trough washery liquid and stop the solder flux removal, saved a large amount of time than blast and mechanical grinding, piece surface is effective.
Description of drawings
Fig. 1 is that TC4 titanium alloy superplastic forming spare stops solder flux removal front and back microscopic appearance figure.
Embodiment
Embodiment 1 TC4 titanium alloy superplastic forming is ended solder flux and is removed processing method and removal effect
TC4 titanium alloy superplastic forming is ended solder flux and is removed processing method, and method is as follows:
1) TC4 titanium alloy superplastic formation spare is immersed in alkaline wash, 140 ~ 170 ℃ of temperature, clean 1.5 h, alkaline wash is sodium hydroxide and Sodium Nitrite mixed aqueous solution, wherein contains sodium hydroxide 500 g/L, Sodium Nitrite 150 g/L;
2) take out from alkaline wash after, wash alkaline wash with clear water, then TC4 titanium alloy superplastic formation spare is put into pickle solution, at room temperature clean 1.5 min, after taking out, water cleans, dries up, pickle solution is the mixed aqueous solution of hydrofluoric acid and nitric acid, hydrofluoric acid concentration 90 g/L wherein, concentration of nitric acid 300 g/L.
Removal effect: original TC4 titanium alloy superplastic forming spare stops solder flux and is white in color in the knee, high-visible, and becoming yellow through stopping solder flux after alkali cleaning, after pickling, the surface of titanium alloy presents metallic color, say the removal fully of titanium alloy surface yellow substance, reached and removed the only purpose of solder flux of white.
Embodiment 2 TC4 titanium alloy superplastic formings are ended solder flux and are removed processing method and removal effect
TC4 titanium alloy superplastic forming is ended solder flux and is removed processing method, and method is as follows:
1) TC4 titanium alloy superplastic formation spare is immersed in alkaline wash, 140 ~ 170 ℃ of temperature, clean 3.5 h, alkaline wash is sodium hydroxide and Sodium Nitrite mixed aqueous solution, wherein contains sodium hydroxide 700 g/L, Sodium Nitrite 250 g/L;
2) take out from alkaline wash after, wash alkaline wash with clear water, then TC4 titanium alloy superplastic formation spare is put into pickle solution, at room temperature clean 4min, after taking out, water cleans, dries up, pickle solution is the mixed aqueous solution of hydrofluoric acid and nitric acid, hydrofluoric acid concentration 10 g/L wherein, concentration of nitric acid 450 g/L.
Removal effect: in order to further illustrate the only removal effect of solder flux, to virgin alloy and remove the alloy of solder flux only the cross section memory metallographicobservation, as can be seen from Figure 1, there is the nonconducting black band of one deck at original TC4 titanium alloy surface, thickness is about 8 μ m, distribute more even, this layer is exactly take BN as main only solder flux; After adopting only solder flux removal technique of the present invention, titanium alloy surface presents metallic color, can find out from microscopic appearance figure, and the only solder flux of TC4 titanium alloy surface is removed.This shows that the only solder flux of TC4 titanium alloy surface has reached the purpose of effective removal after through alkali cleaning and acid cleaning process.
Claims (1)
1.TC4 the titanium alloy superplastic forming is ended solder flux and is removed processing method, it is characterized in that method is as follows:
1) TC4 titanium alloy superplastic formation spare is immersed in alkaline wash, 140 ~ 170 ℃ of temperature, clean 1 ~ 4 h, alkaline wash is sodium hydroxide and Sodium Nitrite mixed aqueous solution, wherein contains sodium hydroxide 500 ~ 700 g/L, Sodium Nitrite 150 ~ 250 g/L;
2) take out from alkaline wash after, wash alkaline wash with clear water, then TC4 titanium alloy superplastic formation spare is put into pickle solution, at room temperature clean 1 ~ 4min, after taking out, water cleans, dries up, pickle solution is the mixed aqueous solution of hydrofluoric acid and nitric acid, 10 g/L＜hydrofluoric acid concentration≤90 g/L wherein, concentration of nitric acid 300 ~ 450 g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100743457A CN103160843A (en) | 2013-03-08 | 2013-03-08 | Process for removing welding stopping agent in TC4 titanium alloy superplastic forming |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100743457A CN103160843A (en) | 2013-03-08 | 2013-03-08 | Process for removing welding stopping agent in TC4 titanium alloy superplastic forming |
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| Publication Number | Publication Date |
|---|---|
| CN103160843A true CN103160843A (en) | 2013-06-19 |
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| CN2013100743457A Pending CN103160843A (en) | 2013-03-08 | 2013-03-08 | Process for removing welding stopping agent in TC4 titanium alloy superplastic forming |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433648A (en) * | 2013-09-09 | 2013-12-11 | 哈尔滨工业大学 | A kind of easy-coating TiO2 solid solder stop flux for titanium alloy superplastic forming/diffusion bonding and preparation method thereof |
| CN104694947A (en) * | 2015-04-01 | 2015-06-10 | 航天精工股份有限公司 | Cadmium coating passive film removing method |
| CN104894580A (en) * | 2015-06-25 | 2015-09-09 | 贵州航天精工制造有限公司 | Novel cleaning fluid and cleaning method for titanium alloy scale cinder |
| CN105256317A (en) * | 2015-10-27 | 2016-01-20 | 苏州市海岸钛业股份有限公司 | Titanium chip alkaline etching and smoothing process |
| CN107740124A (en) * | 2017-09-29 | 2018-02-27 | 中国航发航空科技股份有限公司 | The removal technique of casing unit titanium alloy α layers in a kind of aerial engine fan |
| CN109576709A (en) * | 2019-01-29 | 2019-04-05 | 中国科学院金属研究所 | The chemical minimizing technology of Ta coating is sputtered on a kind of alloy steel matrix |
| CN110344061A (en) * | 2019-08-22 | 2019-10-18 | 北京星航机电装备有限公司 | A kind of thin-wall titanium alloy skin-surface oxide layer chemistry minimizing technology |
-
2013
- 2013-03-08 CN CN2013100743457A patent/CN103160843A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 乔永莲等: "TC4钛合金表面止焊剂去除工艺研究", 《测控技术》 * |
| 林兆荣: "《金属超塑性成形原理及应用》", 30 November 1990, 航空工业出版社 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433648A (en) * | 2013-09-09 | 2013-12-11 | 哈尔滨工业大学 | A kind of easy-coating TiO2 solid solder stop flux for titanium alloy superplastic forming/diffusion bonding and preparation method thereof |
| CN104694947A (en) * | 2015-04-01 | 2015-06-10 | 航天精工股份有限公司 | Cadmium coating passive film removing method |
| CN104894580A (en) * | 2015-06-25 | 2015-09-09 | 贵州航天精工制造有限公司 | Novel cleaning fluid and cleaning method for titanium alloy scale cinder |
| CN105256317A (en) * | 2015-10-27 | 2016-01-20 | 苏州市海岸钛业股份有限公司 | Titanium chip alkaline etching and smoothing process |
| CN107740124A (en) * | 2017-09-29 | 2018-02-27 | 中国航发航空科技股份有限公司 | The removal technique of casing unit titanium alloy α layers in a kind of aerial engine fan |
| CN107740124B (en) * | 2017-09-29 | 2019-03-01 | 中国航发航空科技股份有限公司 | The removal technique of α layers of casing unit titanium alloy in a kind of aerial engine fan |
| CN109576709A (en) * | 2019-01-29 | 2019-04-05 | 中国科学院金属研究所 | The chemical minimizing technology of Ta coating is sputtered on a kind of alloy steel matrix |
| CN110344061A (en) * | 2019-08-22 | 2019-10-18 | 北京星航机电装备有限公司 | A kind of thin-wall titanium alloy skin-surface oxide layer chemistry minimizing technology |
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Application publication date: 20130619 |