CN1158408C - Solution for removing containmanted titanium alloy layers - Google Patents
Solution for removing containmanted titanium alloy layers Download PDFInfo
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- CN1158408C CN1158408C CNB011333847A CN01133384A CN1158408C CN 1158408 C CN1158408 C CN 1158408C CN B011333847 A CNB011333847 A CN B011333847A CN 01133384 A CN01133384 A CN 01133384A CN 1158408 C CN1158408 C CN 1158408C
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- titanium alloy
- solution
- concentration
- alloy layers
- milling
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Abstract
The present invention relates to a solution for removing polluted titanium alloy layers, which is formed by preparation of hydrofluoric acid, hydrogen nitrate and two addition agents. The present invention comprises the following consumption of the components: 50 ml/l to 150 ml/l of the hydrofluoric acid (HF) (concentration is 42%), 100 ml/l to 300 ml/l of the hydrogen nitrate (HNO3) (concentration is from 65 to 68%), 80 ml/l to 200 ml/l of phosphoric acid (H3PO4) (concentration is 85%) which is used as the first addition agent, 15 g/l to 40 g/l of a carbomite derivative which is used as the second addition agent, and the rest of water. The components with the use amount are evenly mixed to form the solution. The present invention can be used for thoroughly removing polluted titanium alloy layers, and solves the key problems of broaching, milling and processing titanium alloy. Thus, the mechanical processing efficiency is obviously improved, and the service life of a broaching tool is obviously prolonged.
Description
Technical field
The invention belongs to the chemical corrosion technical field.
Background technology
Chemical corrosion method or form ethcing also are in chemical milling.It is metal to be placed on pass through chemical reaction in strong acid or the strong base solution, with certain corrosion speed the piece surface uniform corrosion is fallen a part, obtains the chemical process method of required shape and size.
The demand for development of modern aircraft industry manufactures and designs the whole stiffening member of tolerance precision, variable cross-section or curved surface part that aerodynamically and stress distribution require, adopt intensity height, light specific gravity, special metal material that physical and mechanical property is good in addition day by day, as titanium alloy, these bring very big difficulty all for common cutting process.
In the normal pressure heat treatment process, form the pollution layer of the thick rich α phase composite of crystal grain because of high temperature oxidation as titanium alloy, the hard very difficult cutting of quality, at the titanium alloy blade of 950 ℃ of die forgings, measure its pollution layer outermost layer microhardness and be converted into Rc and reach 59, and matrix hardness Rc36 only.Pollution layer adopts general machining process to be difficult to " gnawing " in the process redundancy scope of blade profile.
Chemical milling is not subjected to the part shape limitation of complexity, is not subjected to restrictions such as part hardness, intensity yet, and chemical milling amount fluctuation range generally can reach ± 0.05mm, can replace mechanical workout to remove the process redundancy of precision or half precision fork part.So remove the machinability that pollution layer improves piece surface with chemical milling, removing part process redundancy has very big meaning.
B
TThe 3-1 titanium closes the surplus alpha+beta titanium alloys that belongs to, and chemical milling β and alpha+beta titanium alloys be difficulty quite, selects a suitable etchant solution necessary.The standard of well behaved etchant solution has two aspects, and the one, can be equably and do not influence the tolerance of dimension of part with suitable steady rate milling metallic surface; The 2nd, in the bigger scope of temperature and concentration difference, can both carry out milling effectively.If after chemical milling, intergranular corrosion of point-like burn into or surface irregularity etc. appear in piece surface, and this explanation chemical milling is unsuccessful.
Summary of the invention
In order to solve the problem that existing etchant solution can not removing containmanted titanium alloy layers, the invention provides and a kind ofly can erode titanium credit union surface contamination layer and do not influence the tolerance of dimension of part, and piece surface can not produce intergranular corrosion, piece surface there is the leveling effect, can improves the solution for removing containmanted titanium alloy layers of piece surface smooth finish.
Solution of the present invention is to adopt nitric acid, hydrofluoric acid to add that two kinds of additives are formulated.Hydrofluoric acid adopts HF (42%), nitric acid HNO
3(65～68%), No. 1 additive is H
3PO
4(85%); No. 2 additives are carboxamide derivatives.Its consumption is: HF (42%): 50ml/L～150ml/L; HN O
3(65-68%): 100ml/L～300ml/L; No. 1 additive H
3PO
4(85%): 80ml/L～200ml/L; No. 2 additive carboxamide derivatives 15g/L～40g/L; Surplus is a water.
Solution of the present invention adopts the general method uniform mixing to form.Optimizing etchant solution prescription of the present invention by orthogonal test is:
Hydrofluoric acid HF (42%) 120ml/L
Nitric acid HNO
3(65-68%) 260ml/L
No. 1 additive H
3PO
4(85%) 160ml/L
No. 2 additive carboxamide derivatives 25g/L
Surplus is a water.
Use the present invention, at first according to the good solution of above formulated, be contained in the treatment trough, then titanium alloy spare is carried out electrochemical deoiling, remove surface and oil contaminant etc.,, neatly put the dress of the titanium alloy spare after deoiling basket, do not allow overlapped, under titanium alloy spare, prepare a sample (with to wait to corrode the part state identical) before the groove, measure certain position dimension, take out behind the corrosion several minutes, get this position dimension again, draw corrosion speed, thereby calculate the time of removing pollution layer, according to the time of calculating titanium alloy spare is put into treatment trough then and corrode, successively use hot water and cold wash clean after going out groove, then workpiece is dried up the back vanning.
The present invention can thoroughly remove containmanted titanium alloy layers, has solved the key that the titanium alloy broach-milling is cut processing, titanium alloy is used become a reality, and simultaneously mechanical workout efficient is significantly improved, and broaching tool obviously increases work-ing life.
Embodiment
Etchant solution: form by following prescription uniform mixing.
Hydrofluoric acid HF (42%) 70ml/L
Nitric acid HNO
3(65-68%) 150ml/L
No. 1 additive H
3PO
4(85%) 100ml/L
No. 2 additive carboxamide derivatives 25g/L
Surplus is a water
Sample is prepared
With B
TThe 3-1 bar is heated to 870 ℃ of insulation 1h: be chilled to 650 ℃ with stove, insulation 2h air cooling is processed into the disk that diameter is 65mm.
Test-results
Corrosion speed and solution temperature relation
The chemical milling of titanium alloy is a chemical reaction process, so the dissolution rate of etchant solution temperature effect titanium alloy, and solution temperature is high more, and the dissolution rate of titanium alloy is also fast more, the results are shown in Table 1:
Table 1 is corrosion speed in the differing temps etchant solution
| Sequence number | The etchant solution temperature, ℃ | Corrode fast μ m/min |
| 1 | 45 | 4.5 |
| 2 | 55 | 7.2 |
| 3 | 65 | 13.0 |
The milling homogeneity
The titanium alloy chemical milling is to replace mechanical means to remove pollution layer and process redundancy with chemical process, so the chemical milling homogeneity is very important, otherwise can influence the size and dimension of part, measure 5 points at every turn in test in test piece, the difference of its maximum milling amount is called unevenness.
Table 2 etchant solution milling homogeneity situation
| Sequence number | The etchant solution temperature, ℃ | 5 mill away size (single face), mm | Unevenness, mm |
| 1 | 55 | 0.202，0.190，0.205，0.205，0.197 | 0.015 |
| 2 | 65 | 0.161，0.151，0.150，0.160，0.168 | 0.018 |
The etchant solution temperature is than higher, and it is fiercer to react, and produces that gas is more to wash away test piece, influences the milling homogeneity.
Time presses the pollution layer degree of depth and decides, and solution temperature is controlled at 45 ℃～65 ℃, and it is slow that temperature is crossed low corrosion speed, and the too high reaction of temperature is too fierce, even emits deleterious NO
2The gas contamination environment.
Check that corrosion back sample has or not the intergranular corrosion phenomenon
Because the etchant solution that uses is a strong acid solution, have or not intergranular corrosion after being necessary to check corrosion, sample produces Ou Bo with optics microscopy with Germany.
Two samples, its depth of corrosion are respectively 0.110mm and 0.166mm, all do not find the intergranular corrosion phenomenon on inspection.
Surface smoothness changes
Piece surface smooth finish after the corrosion directly influences the surface quality and the usage quantity of part, so checking the specimen surface smooth finish before and after the corrosion changes very important, it is cylindric that sample is, and measures the roughness of both ends of the surface, produces the T4000 surface roughness tester with Germany and measure.
Table 3 chemical milling front and rear surfaces smooth finish changes
| Sequence number | Remove size, mm | Roughness before the chemical milling | Roughness after the chemical milling |
| 1 | 0.098 | 0.70，0.60 | 0.48，0.38 |
| 2 | 0.169 | 0.80，0.66 | 0.58，0.50 |
The etchant solution of Shi Yonging has the leveling effect as can be seen from the results.
Claims (1)
1, a kind of solution for removing containmanted titanium alloy layers is characterized in that this solution is to adopt hydrofluoric acid, nitric acid and two kinds of additives formulated, and its consumption concentration that is weight percentage is 42% hydrofluoric acid: 50ml/L～150ml/L; Weight percent concentration is 65～68% nitric acid: 100ml/L～300ml/L; A kind of additive concentration that is weight percentage is 85% phosphoric acid: 80ml/L～200ml/L; Another kind of additive is carboxamide derivatives: 15g/L～40g/L; Surplus is a water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011333847A CN1158408C (en) | 2001-10-31 | 2001-10-31 | Solution for removing containmanted titanium alloy layers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011333847A CN1158408C (en) | 2001-10-31 | 2001-10-31 | Solution for removing containmanted titanium alloy layers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1352321A CN1352321A (en) | 2002-06-05 |
| CN1158408C true CN1158408C (en) | 2004-07-21 |
Family
ID=4671767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011333847A Expired - Fee Related CN1158408C (en) | 2001-10-31 | 2001-10-31 | Solution for removing containmanted titanium alloy layers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1158408C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390322C (en) * | 2005-09-21 | 2008-05-28 | 中国海洋大学 | Chemical etching solution for titanium and titanium alloy |
| CN102978631B (en) * | 2011-09-06 | 2014-12-10 | 沈阳黎明航空发动机(集团)有限责任公司 | Precise titanium alloy part re-melted layer removing method |
| CN105350051B (en) * | 2015-11-13 | 2017-08-08 | 哈尔滨东安发动机（集团）有限公司 | A kind of method for solving aluminum hardware surface Sn Bi alloy contaminations |
-
2001
- 2001-10-31 CN CNB011333847A patent/CN1158408C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1352321A (en) | 2002-06-05 |
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Granted publication date: 20040721 Termination date: 20131031 |