US3850712A - Method of etching a titanium or titanium alloy part - Google Patents
Method of etching a titanium or titanium alloy part Download PDFInfo
- Publication number
- US3850712A US3850712A US00261815A US26181572A US3850712A US 3850712 A US3850712 A US 3850712A US 00261815 A US00261815 A US 00261815A US 26181572 A US26181572 A US 26181572A US 3850712 A US3850712 A US 3850712A
- Authority
- US
- United States
- Prior art keywords
- titanium
- mixture
- etching
- titanium alloy
- minutes
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000005530 etching Methods 0.000 title claims abstract description 15
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 13
- 239000010936 titanium Substances 0.000 title claims abstract description 13
- 229910001069 Ti alloy Chemical group 0.000 title claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 21
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 8
- 238000007654 immersion Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-PWCQTSIFSA-N Tritiated water Chemical compound [3H]O[3H] XLYOFNOQVPJJNP-PWCQTSIFSA-N 0.000 claims 1
- 230000000007 visual effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 2
- 206010003549 asthenia Diseases 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011176 pooling Methods 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 208000016258 weakness Diseases 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/106—Other heavy metals refractory metals
Definitions
- ABSTRACT relates to a method of etching a titanium or titanium alloy part in which the part is immersed in a mixture comprising nitric acid, hydro fluorosilicic acid and water.
- the present invention provides a method of etching which is relatively slow and which produces a matt surface condition on which the grain etched surface is less pronounced and which is suitable for both binocular and subsequent penetrant inspection.
- a method of etching a titanium or titanium alloy part comprises immersing the part in a mixture comprising nitric acid, hydrofluorosilicic acid and water.
- the necessary time of immersion of the part in the mixture will vary in accordance with the amount of metal to be removed, the temperature of the mixture and various other factors, but we have found that for a metal removal of approximately a tenth of a thousandth of an inch, at a mixture temperature of about 20C, an immersion time of from 4 to 20 minutes may be used.
- the invention also comprises a mixture suitable for etching titanium or alloys thereof and comprising nitric acid, hydrofluorosilicic acid, and water.
- the mixture comprises between I60 and I80 grams per litre of nitric acid, between'8 and 12 grams per litre of the hydrofluorosilicic acid, the remainder comprising water.
- the titanium or alloy part has been heated it may be necessary to pre-condition the oxide film so as to avoid uneven etchirigfTypically this would use an alkaline permanganate solution which would comprise 50-100 grams per litre of potassium permanganate, l-l25 grams per litre of sodium hydroxide and 100-125 grams per litre of sodium carbonate, the remainder comprising water. Alternatively a proprietary solution could be used.
- the invention is particularly useful when applied to parts such as compressor drums of gas turbine engines.
- a solution was made up comprising 170 grams per litre of nitric acid and grams per litre of hydro fluorosilicic acid, the remainder comprising water.
- a tank was filled with the solution at a temperature of approximately C and the compressor drum of a gas turbine engine was immersed inthe solution.
- the drum comprised a titanium alloy known as lMl 684 which is basically titanium with the addition of 6 percent Al, Zr 5 percent, W 1 percent.
- the drum was left in the solution for some 20 minutes and was then removed and washed out with water.
- the drum was then inspected through binocular microscopes and using a penetrant technique to determine the location of any flaws such as cracks or the like.
- the time of immersion of similar titanium parts in the etchant mixture could sometimes be reduced to 4 minutes for a metal removal of about a tenth of a thoube reduced still further if the temperature of the etch- 'ant mixture, which is normally room temperature, is increased above room temperature or if the ambient temperature happens to be high.
- the times of immersion not to be altered to a large extent within the range of l6-22C mixture temperature, and within this range we find that an immersion time between 4 and 20 minutes will produce metal removal of about a tenth of a thousandth of an inch, which is normally an optimum amount to minimise metal removal while producing the necessary surface finish to allow surface inspection.
- drums were etched and inspected after they had been run on a gas turbine engine and were therefore coated with oxides.
- a method of etching a titanium or titanium alloy part comprising contacting the part with a mixture consistingessentially of nitric acid, hydrofluorosilicic acid and water, and continuing contact with said mixture until a matt surface is produced on said part adapted for improvedvisualdetection of flaws therein.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2836771 | 1971-06-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3850712A true US3850712A (en) | 1974-11-26 |
Family
ID=10274536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00261815A Expired - Lifetime US3850712A (en) | 1971-06-17 | 1972-06-12 | Method of etching a titanium or titanium alloy part |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3850712A (cs) |
| FR (1) | FR2142079B1 (cs) |
| GB (1) | GB1344711A (cs) |
| IT (1) | IT960821B (cs) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4551434A (en) * | 1983-03-16 | 1985-11-05 | Mtu Motoren-Und Turbinen-Union Muenchen Gmbh | Method for recognizing structural inhomogeneities in titanium alloy test samples including welded samples |
| EP0179013A1 (en) * | 1984-10-16 | 1986-04-23 | United Technologies Corporation | Chemical milling using an inert particulate and moving vessel |
| US20050011863A1 (en) * | 2003-07-17 | 2005-01-20 | Peter Wayte | Method for inspecting a titanium-based component |
| WO2005017230A1 (ja) * | 2003-08-19 | 2005-02-24 | Mitsubishi Chemical Corporation | チタン含有層用エッチング液およびチタン含有層のエッチング方法 |
| US20070283560A1 (en) * | 2006-06-05 | 2007-12-13 | United Technologies Corporation | Enhanced weldability for high strength cast and wrought nickel superalloys |
| CN100537847C (zh) * | 2005-02-24 | 2009-09-09 | 关东化学株式会社 | 钛、铝金属层叠膜蚀刻液组合物 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2457471A2 (fr) * | 1979-05-23 | 1980-12-19 | Pechiney Aluminium | Procede continu d'elimination des incrustations essentiellement titaniferes des parois d'echangeurs thermiques |
| FR2431671A1 (fr) * | 1978-07-19 | 1980-02-15 | Pechiney Aluminium | Procede d'elimination des incrustations essentiellement titaniferes des parois d'echangeurs thermiques |
| FR2961598B1 (fr) * | 2010-06-21 | 2012-07-27 | Snecma | Procede de controle d'une piece en titane ou en alliage de titane en vue de la detection de defauts d'usinage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2711364A (en) * | 1953-12-31 | 1955-06-21 | John G Beach | Polishing metals and composition therefor |
| US2981609A (en) * | 1956-11-20 | 1961-04-25 | United Aircraft Corp | Etching bath for titanium and its alloys and process of etching |
| US3514407A (en) * | 1966-09-28 | 1970-05-26 | Lockheed Aircraft Corp | Chemical polishing of titanium and titanium alloys |
-
1972
- 1972-05-30 GB GB2836771A patent/GB1344711A/en not_active Expired
- 1972-06-07 IT IT25363/72A patent/IT960821B/it active
- 1972-06-12 US US00261815A patent/US3850712A/en not_active Expired - Lifetime
- 1972-06-19 FR FR7222033A patent/FR2142079B1/fr not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2711364A (en) * | 1953-12-31 | 1955-06-21 | John G Beach | Polishing metals and composition therefor |
| US2981609A (en) * | 1956-11-20 | 1961-04-25 | United Aircraft Corp | Etching bath for titanium and its alloys and process of etching |
| US3514407A (en) * | 1966-09-28 | 1970-05-26 | Lockheed Aircraft Corp | Chemical polishing of titanium and titanium alloys |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4551434A (en) * | 1983-03-16 | 1985-11-05 | Mtu Motoren-Und Turbinen-Union Muenchen Gmbh | Method for recognizing structural inhomogeneities in titanium alloy test samples including welded samples |
| EP0179013A1 (en) * | 1984-10-16 | 1986-04-23 | United Technologies Corporation | Chemical milling using an inert particulate and moving vessel |
| US20050011863A1 (en) * | 2003-07-17 | 2005-01-20 | Peter Wayte | Method for inspecting a titanium-based component |
| US7097783B2 (en) * | 2003-07-17 | 2006-08-29 | General Electric Company | Method for inspecting a titanium-based component |
| WO2005017230A1 (ja) * | 2003-08-19 | 2005-02-24 | Mitsubishi Chemical Corporation | チタン含有層用エッチング液およびチタン含有層のエッチング方法 |
| CN100537847C (zh) * | 2005-02-24 | 2009-09-09 | 关东化学株式会社 | 钛、铝金属层叠膜蚀刻液组合物 |
| US20070283560A1 (en) * | 2006-06-05 | 2007-12-13 | United Technologies Corporation | Enhanced weldability for high strength cast and wrought nickel superalloys |
| US7854064B2 (en) * | 2006-06-05 | 2010-12-21 | United Technologies Corporation | Enhanced weldability for high strength cast and wrought nickel superalloys |
Also Published As
| Publication number | Publication date |
|---|---|
| IT960821B (it) | 1973-11-30 |
| DE2229897B2 (de) | 1975-06-12 |
| DE2229897A1 (de) | 1972-12-21 |
| FR2142079B1 (cs) | 1977-12-23 |
| GB1344711A (en) | 1974-01-23 |
| FR2142079A1 (cs) | 1973-01-26 |
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