US3690949A - Alkaline bath for nonetching removal of scale from titanium workpieces - Google Patents
Alkaline bath for nonetching removal of scale from titanium workpieces Download PDFInfo
- Publication number
- US3690949A US3690949A US84110A US3690949DA US3690949A US 3690949 A US3690949 A US 3690949A US 84110 A US84110 A US 84110A US 3690949D A US3690949D A US 3690949DA US 3690949 A US3690949 A US 3690949A
- Authority
- US
- United States
- Prior art keywords
- sodium
- titanium
- workpiece
- bath
- scale
- 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
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title abstract description 29
- 239000010936 titanium Substances 0.000 title abstract description 29
- 229910052719 titanium Inorganic materials 0.000 title abstract description 29
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 33
- 239000000203 mixture Substances 0.000 abstract description 19
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Inorganic materials [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 abstract description 18
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Substances [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 abstract description 15
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract description 13
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 abstract description 12
- 239000000176 sodium gluconate Substances 0.000 abstract description 12
- 235000012207 sodium gluconate Nutrition 0.000 abstract description 12
- 229940005574 sodium gluconate Drugs 0.000 abstract description 12
- 235000010344 sodium nitrate Nutrition 0.000 abstract description 12
- 239000004317 sodium nitrate Substances 0.000 abstract description 12
- 229910052708 sodium Inorganic materials 0.000 abstract description 11
- 235000010288 sodium nitrite Nutrition 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 235000010333 potassium nitrate Nutrition 0.000 abstract description 6
- 239000004323 potassium nitrate Substances 0.000 abstract description 6
- HLCFGWHYROZGBI-JJKGCWMISA-M Potassium gluconate Chemical compound [K+].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O HLCFGWHYROZGBI-JJKGCWMISA-M 0.000 abstract description 5
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 abstract description 5
- 239000004224 potassium gluconate Substances 0.000 abstract description 5
- 235000013926 potassium gluconate Nutrition 0.000 abstract description 5
- 229960003189 potassium gluconate Drugs 0.000 abstract description 5
- 235000010289 potassium nitrite Nutrition 0.000 abstract description 5
- 239000004304 potassium nitrite Substances 0.000 abstract description 5
- -1 2-25 WEIGHT PERCENT Chemical compound 0.000 abstract description 4
- 238000005530 etching Methods 0.000 abstract description 3
- 150000004767 nitrides Chemical class 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 20
- 239000000243 solution Substances 0.000 description 19
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical class OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 206010000496 acne Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N hydrofluoric acid Substances F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 235000015424 sodium Nutrition 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 229940001516 sodium nitrate Drugs 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/06—Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/10—Salts
- C11D7/105—Nitrates; Nitrites
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/265—Carboxylic acids or salts thereof
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/32—Organic compounds containing nitrogen
- C11D7/3218—Alkanolamines or alkanolimines
-
- 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
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/20—Other heavy metals
- C23G1/205—Other heavy metals refractory metals
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/20—Industrial or commercial equipment, e.g. reactors, tubes or engines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
TITANIUM SCALE, GENERALLY COMPRISING OXIDES AND NITRIDES OF TITANIUM, MAY BE REMOVED FROM TITANIUM WORKPIECES WITHOUT SIMULTANEOUSLY RAPIDLY ETCHING THE WORKPIECE BY SUBJECTING THE WORKPIECE TO A SOLUTION IN WATER OF FROM 2 TO 10 POUNDS PER GALLON OF THE MIXTURE CONSISTING ESSENTIALLY OF SODIUM OR POTASSIUM NITRITE, 2-25 WEIGHT PERCENT, SODIUM OR POTASSIUM GLUCONATE 2-25 WEIGHT PERCENT, SODIUM OR POTASSIUM NITRATE, 2-25 WEIGH PERCENT, AND SODIUM HYDROXIDE, BALANCE TO 100 WEIGHT PERCENT, E.G., BY IMMERSING THE WORKPIECE IN AN ELEVATED TEMPERATURE BATH AT TEMPERATURES BETWEEN ABOUT 200*F. AND 300*F.
Description
United States PatentOffice 3,690,949 ALKALINE BATH FOR NONETCHING REMOVAL OF SCALE FROM TITANIUM WORKPIECES Daniel Y. Ng, Brooklyn, N.Y., assignor to Purex Corporation, Ltd., Lakewood, Calif. No Drawing. Filed Oct. 26, 1970, Ser. No. 84,110
Int. Cl. C23g 1/22 US. Cl. 1342 16 Claims ABSTRACT OF THE DISCLOSURE BACKGROUND OF THE INVENTION (1) Field of the invention This invention has to do with the removal of scale, such as oxides, nitrides, carbides and the like from the surfaces of titanium workpieces. Titanium scale and particularly oxides of titanium constitutes virtually the most refractory of all known materials. Titanium oxides have very high melting points and are resistant to almost all types of chemical attack. Many uses of titanium require the removal of the natural oxide coating or an oxide coating induced by metal treating processes such as heat treating, anodizing or oxides produced in the use of a part.
(2) Prior art The heretofore accepted method for descaling titanium and removing the oxides from workpiece surfaces has included an alkaline precleaning step, sometimes followed by an alkaline conditioning step and a post treatment in a bath of nitric-hydrofluoric acid. Titanium oxide has been thought to be impervious to alkaline solutions and accordingly, efforts at improving the cleaning of titanium workpieces have been directed primarily at the development of more vigorous and more effective acids.
In copending application Ser. No. 837,950, assigned to the same assignee as this application, now US. Pat. 3,553,015, a highly effective alkaline descaling system is disclosed. However, that system etches titanium workpieces and where etching is not wanted, its use is not desirable. The present system is as effective in descaling but without etching the workpiece.
SUMMARY OF THE INVENTION It has now been discovered that a highly alkaline solution such as an aqueous solution of sodium hydroxide is effective to remove scale from titanium workpieces where the scale removing solution contains certain amounts of sodium or potassium nitrate, nitrite and gluconate salts. Sodium gluconate may be formed in situ in a descaling bath comprising the solution of reaction product of gluconic acid and sodium hydroxide.
DESCRIPTION OF THE PREFERRED EMBODIMENTS in carrying out the present invention, a treating solution is prepared by dissolving in water from 2 to pounds and preferably about 8 pounds of a mixture of sodium or potassium nitrite, sodium or potassium nitrate, sodium Patented Sept. 12, 1972 or potassium gluconate, and sodium hydroxide. The solution is heated to elevated temperature, generally about 175 F. up to just below the boiling point of the solution and preferably between about 20030 0 F.
The mixture dissolved in the solution consists essentially of sodium or potassium nitrite at 2-25 weight percent and preferably 5 weight percent sodium nitride, sodium or potassium nitrate at 2-25 Weight percent and preferably 5 weight percent sodium nitrate, sodium or potassium gluconate at 2 to 25 weight percent and preferably 5 weight percent sodium gluconate and the balance to 100 percent of sodium hydroxide.
The workpiece which may be degreased by conventional procedures in advance of scale removal, is subjected to the action of the treating solution having the composition indicated above, by applying the solution to the workpiece, e.g. by spraying, brushing, flow coating and, particularly by immersion in a bath comprising the solution. When immersed in a bath this may range from five minutes up to thirty minutes or more, e.g. up to 8 hours for badly scaled forgings and castings. Multiple immersions in successive or the same aqueous bath can be used where desired.
The titanium workpiece following treatment is free of scale particularly of heat scale and welding discoloration and the workpiece surface is left suitable for use subsequently in welding, bonding, plating or painting. Thus, the descaling solution herein disclosed serves as a cleaner and a pickel for titanium.
Titanium alloys can be similarly treated as titanium workpieces. Titanium alloys with such materials as aluminum, vanadium, molybdenum, iron and nickel, e.g. up to 10 percent by weight of the alloy, may be cleaned by the indicated procedures, as can niobium and tantalum metals.
EXAMPLE 1 All parts and percentages are by weight A titanium scale removal bath was prepared as follows: A mixture of 5 percent sodium nitrite, 5 percent sodium nitrate, 5 percent sodium gluconate, and correspondingly percent sodium hydroxide was mixed dry. An exothermic reaction took place with introduction of water. The mixture was dissolved at the rate of 8 pounds per gallon of bath in water. The water solution was heated to 260 F. Titanium workpieces having oxides and nitride scale on their surfaces resulting from heat treating were immersed in the bath for periods ranging from 5 minutes to thirty minutes. The workpieces were removed from the bath, when the scale thereon had been removed, rinsed and dried. The workpiece surfaces were noted to be clean and suitable for welding, bonding, plating or painting operations.
CONTROL A Example 1 is duplicated but omitting the sodium gluconate. There was no appreciable removal of scale in an hour and a half.
CONTROL B CONTROLS C, D AND E Example 1 is duplicated but omitting the sodium hydroxide, sodium nitrite or sodium nitrate. The resulting baths were ineffective for removing titanium scale from titanium workpieces.
Accordingly, combination of any two of the cleaning bath components is not effective as a descaler due to slowness of attack on the substrate and oxide and uneconomically long processing times.
CONTROL F A titanium scale removal bath was prepared, according to the teachings of U.S. Ser. No. 837,950, as follows: A mixture of 18.5 percent sodium gluconate, 13.5 percent triethanolamine, and correspondingly 68 percent sodium hydroxide was dissolved at the rate of 3.1 to pounds per gallon of bath in water. The water solution was heated to 200 F. Scaled titanium workpieces were removed from the bath, rinsed and dried. The workpieces were noted to be clean and visibly etched to a dull matte finish to break up the sheen on ground areas and obliterate the grinding marks.
In the typical practice of the present invention, contact times between the solution and the workpiece will range between five and ninety minutes with longer or shorter periods, depending on scale conditions, temperature of the solution and concentration of the solution.
EXAMPLE 2 A solution having the composition given for the bath in Example 1 and at 260 F. is sprayed onto a scaled titanium workpiece in a closed chamber for 5 minutes. The workpiece is thereafter rinsed and dried. The workpiece surfaces are clean and free of scale. It is estimated the workpiece would have required to minutes to be cleaned in an immersion bath.
I claim:
1. Method of descaling titanium comprising subjecting a scaled titanium workpiece to a solution, heated to above about 175 F., of from 2 to 10 pounds per gallon of a mixture free of triethanolamine consisting essentially of Weight percent Sodium or potassium nitrite 2-25 Sodium or potassium nitrate 2-25 Sodium or potassium gluconate 225 Sodium hydroxide, balance to 100.
made up to a gallon with water and removing the workpiece from the bath following scale removal.
2. Method according to claim 1 in which said mixture contains 5 percent by weight of sodium nitrite.
3. Method according to claim 1 in which said mixture contains 5 percent by weight of sodium nitrate.
4. Method according to claim 1 in which said mixture contains 5 percent by weight sodium gluconate.
5. Method according to claim 1 in which each salt is present in an amount of 5 percent by weight in the mixture.
6. Method according to claim 1 in which said bath has a temperature between 200 and 300 F.
7. Method of descaling titanium comprising immersing a scaled titanium workpiece in a bath heated above 175 F., said bath being a solution of from 2 to 10 pounds per gallon of a mixture consisting essentially of Weight percent Sodium or potassium nitrite 2-25 Sodium or potassium nitrate 2-25 Sodium or potassium gluconate 2-25 Sodium hydroxide, balance to 100.
made up to a gallon with water and removing the workpiece from the bath following scale removal.
8. Method according to claim 7 in which said mixture contains 5 percent by weight of sodium nitrite.
9. Method according to claim 7 in which said mixture contains 5 percent by weight of sodium nitrate.
10. Method according to claim 7 in which said mixture contains 5 percent by weight sodium gluconate.
11. Method according to claim 7 in which each salt is present in an amount of 5 percent by weight in the mixture.
12. Method according to claim 7 in which said bath has a temperature between 200 and 300 F.
13. Method according to claim 7 in which said workpiece is immersed in the bath for a period of 5 to minutes.
14. Method according to claim 7 in which said bath contains 8 pounds of said per gallon.
15. Method of descaling titanium comprising immersing a scaled titanium workpiece for about 15 minutes in a bath heated to about 260 F., said bath being a solution of about 8 pounds per gallon of a mixture consisting essentially of Weight percent Sodium nitrite 5 Sodium nitrate 5 Sodium gluconate 5 Sodium hydroxide, balance to 100.
made up to a gallon with water and removing the workpiece from the bath.
16. Method according to claim 15 in which said bath is free of triethanolarnine.
References Cited UNITED STATES PATENTS OTHER REFERENCES Lester F. Spencer: Metal Finishing, 66(8), 52-8 MORRIS O. WOLK, Primary Examiner S. MARANTZ, Assistant Examiner U.S. Cl. X.R.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8411070A | 1970-10-26 | 1970-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3690949A true US3690949A (en) | 1972-09-12 |
Family
ID=22182938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US84110A Expired - Lifetime US3690949A (en) | 1970-10-26 | 1970-10-26 | Alkaline bath for nonetching removal of scale from titanium workpieces |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3690949A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4292090A (en) * | 1980-05-15 | 1981-09-29 | Textron Inc. | Removal of titanium dioxide from a filter element |
| US4339281A (en) * | 1981-08-20 | 1982-07-13 | Rca Corporation | Shank diamond cleaning |
| US4588474A (en) * | 1981-02-03 | 1986-05-13 | Chem-Tronics, Incorporated | Chemical milling processes and etchants therefor |
| US5763377A (en) * | 1996-06-17 | 1998-06-09 | Dober Chemical Corporation | Compositions and methods for removing titanium dioxide from surfaces |
| WO2005014884A2 (en) * | 2003-07-28 | 2005-02-17 | De Nora Elettrodi S.P.A. | Anode for electrochemical processes |
| US20060016463A1 (en) * | 2004-07-22 | 2006-01-26 | Dober Chemical Corporation | Composition and process for removing titanium dioxide residues from surfaces |
| US20060112972A1 (en) * | 2004-11-30 | 2006-06-01 | Ecolab Inc. | Methods and compositions for removing metal oxides |
| US7125441B1 (en) * | 2005-02-17 | 2006-10-24 | Cortec Corporation | Corrosion inhibiting materials for reducing corrosion in metallic concrete reinforcements |
| US20080223414A1 (en) * | 2007-03-13 | 2008-09-18 | Dober Chemical Corporation | Compositions and methods for removing titanium dioxide from surfaces |
| FR3144821A1 (en) * | 2023-01-11 | 2024-07-12 | Safran Aircraft Engines | METHOD FOR SURFACE TREATMENT OF A PART MADE IN TITANIUM OR A TITANIUM-BASED ALLOY |
-
1970
- 1970-10-26 US US84110A patent/US3690949A/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4292090A (en) * | 1980-05-15 | 1981-09-29 | Textron Inc. | Removal of titanium dioxide from a filter element |
| US4588474A (en) * | 1981-02-03 | 1986-05-13 | Chem-Tronics, Incorporated | Chemical milling processes and etchants therefor |
| US4339281A (en) * | 1981-08-20 | 1982-07-13 | Rca Corporation | Shank diamond cleaning |
| US5763377A (en) * | 1996-06-17 | 1998-06-09 | Dober Chemical Corporation | Compositions and methods for removing titanium dioxide from surfaces |
| WO2005014884A2 (en) * | 2003-07-28 | 2005-02-17 | De Nora Elettrodi S.P.A. | Anode for electrochemical processes |
| WO2005014884A3 (en) * | 2003-07-28 | 2005-05-19 | De Nora Elettrodi Spa | Anode for electrochemical processes |
| US20060016463A1 (en) * | 2004-07-22 | 2006-01-26 | Dober Chemical Corporation | Composition and process for removing titanium dioxide residues from surfaces |
| US20060112972A1 (en) * | 2004-11-30 | 2006-06-01 | Ecolab Inc. | Methods and compositions for removing metal oxides |
| US7611588B2 (en) | 2004-11-30 | 2009-11-03 | Ecolab Inc. | Methods and compositions for removing metal oxides |
| US7125441B1 (en) * | 2005-02-17 | 2006-10-24 | Cortec Corporation | Corrosion inhibiting materials for reducing corrosion in metallic concrete reinforcements |
| US20080223414A1 (en) * | 2007-03-13 | 2008-09-18 | Dober Chemical Corporation | Compositions and methods for removing titanium dioxide from surfaces |
| FR3144821A1 (en) * | 2023-01-11 | 2024-07-12 | Safran Aircraft Engines | METHOD FOR SURFACE TREATMENT OF A PART MADE IN TITANIUM OR A TITANIUM-BASED ALLOY |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3043758A (en) | Process of electrolytically pickling alloy steels | |
| US4707191A (en) | Pickling process for heat-resistant alloy articles | |
| US3553015A (en) | Alkaline bath removal of scale from titanium workpieces | |
| US4659438A (en) | Process for the treatment of stainless steel for a direct galvanic gold plating | |
| US4264418A (en) | Method for detersifying and oxide coating removal | |
| US3690949A (en) | Alkaline bath for nonetching removal of scale from titanium workpieces | |
| US2780594A (en) | Electrolytic descaling | |
| US2458661A (en) | Process of cleaning metal surfaces and compositions therefor | |
| JPS6049717B2 (en) | Pretreatment method for plastic substrate to be plated prior to plating treatment | |
| US2347742A (en) | Pickling process | |
| US3140203A (en) | Method of and composition for treating aluminum and aluminum alloys | |
| US3010854A (en) | Pickling solution and method | |
| US3121026A (en) | Descaling metals and alloys with aqueous potassium hydroxide at relatively low temperature | |
| US3692583A (en) | Desmutting etched aluminum alloys | |
| US3935005A (en) | Composition and method for stripping gold and silver | |
| US3416975A (en) | Etching of aluminum for bonding | |
| US3489625A (en) | Process for metal surface conditioning | |
| US2511988A (en) | Pickling process | |
| US2291202A (en) | Cleaning cupreous articles | |
| US2620265A (en) | Composition for treating aluminum and aluminum alloys | |
| US2593448A (en) | Method and composition for treating aluminum and aluminum alloys | |
| US2481977A (en) | Metal protective coating method | |
| US3524817A (en) | Method and compositions for chemically polishing zinc | |
| US3197341A (en) | Method and composition for descaling stainless steels and related alloys | |
| US2653134A (en) | Process for removing scale from zirconium metal and alloys thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: TP INDUSTRIAL, INC. Free format text: CHANGE OF NAME;ASSIGNOR:PUREX CORPORATION;REEL/FRAME:004561/0588 Effective date: 19860418 |
|
| AS | Assignment |
Owner name: TURCO PRODUCTS, INC., CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TP INDUSTRIAL, INC., A CORP OF CA.;REEL/FRAME:004561/0581 Effective date: 19860603 Owner name: PUREX CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:PUREX CORPORATION, LTD.;REEL/FRAME:004561/0586 Effective date: 19851211 Owner name: TURCO PRODUCTS, INC., 5101 CLARK AVENUE, LAKEWOOD, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TP INDUSTRIAL, INC., A CORP OF CA.;REEL/FRAME:004561/0581 Effective date: 19860603 |