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US2724667A - Process of removing scale from titanium - Google Patents

Process of removing scale from titanium Download PDF

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Publication number
US2724667A
US2724667A US481963A US48196355A US2724667A US 2724667 A US2724667 A US 2724667A US 481963 A US481963 A US 481963A US 48196355 A US48196355 A US 48196355A US 2724667 A US2724667 A US 2724667A
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US
United States
Prior art keywords
titanium
bath
room temperature
cold water
water rinse
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
Application number
US481963A
Inventor
Carl D Macpherson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wayne Foundry and Stamping Co
Original Assignee
Wayne Foundry and Stamping Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wayne Foundry and Stamping Co filed Critical Wayne Foundry and Stamping Co
Priority to US481963A priority Critical patent/US2724667A/en
Application granted granted Critical
Publication of US2724667A publication Critical patent/US2724667A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/10Other heavy metals
    • C23G1/106Other heavy metals refractory metals

Definitions

  • a further object is to provide a method of cleaning formed titanium parts of contamination picked up during fabrication.
  • My improved method comprises the following steps:
  • the piece is placed in a soakingtank containing a commercially obtainable alkali cleaner in solution, the temperature of the bath being preferably maintained at 180 F. to 200 F.
  • This bath is intended to remove dirt, oil and the like picked up during fabrication. Immersion for a period of one minute has been found to be adequate in most instances.
  • the piece is thoroughly rinsed in a cold water rinse.
  • the piece is immersed for approximately one minute in an 18%-20% commercial hydrochloric acid solution at room temperature. This bath removes the zinc alloy which may have adhered to the piece during the stamping or drawing operation.
  • the piece is dried, preferably by an air blast so that the part remains at room temperature.

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)

Description

PROCESS OF REMOVING SCALE FROM TITANIUM Carl D. Macl herson, Detroit, Mich., assignor to Wayne Foundry & Stamping Co., Detroit, Mich.
No Drawing. Application January 14, 1955, Serial No. 481,963
3 Claims. (Cl. 134-3) workpiece in a heated state of from 800-1200 F.
At such an elevated temperature, corrosion products form on the surface which are very dense and adherent and consequently difiicult to remove. In addition, metal from the die parts frequently adheres to thepiece, es pecially if zinc base alloy dies are used for drawing or stamping.
Various types of cleaning processes have been used for removing the scale and the die-metal contamination, but so far these have been objectionable from the standpoint of cost and danger to the workmen. The salt bath solutions now in use require large expenditures for capital equipment and the cost of operating the baths is very high. Furthermore, the use of salt bath solutions causes deleterious effects to the parts being cleaned because of the formation of an electrical potential between the parts and the suspension racks.
It is the prime object of my invention to provide a method of descaling titanium in a safe, economical manner.
A further object is to provide a method of cleaning formed titanium parts of contamination picked up during fabrication.
Other objects and advantages of my invention will be apparent from the following description.
My improved method comprises the following steps:
1. The piece is placed in a soakingtank containing a commercially obtainable alkali cleaner in solution, the temperature of the bath being preferably maintained at 180 F. to 200 F. This bath is intended to remove dirt, oil and the like picked up during fabrication. Immersion for a period of one minute has been found to be adequate in most instances.
2. The piece is thoroughly rinsed in a cold water rinse.
United States Patent perature.
3. The piece is immersed for approximately one minute in an 18%-20% commercial hydrochloric acid solution at room temperature. This bath removes the zinc alloy which may have adhered to the piece during the stamping or drawing operation.
4. Cold water rinse.
5. The piece is dried, preferably by an air blast so that the part remains at room temperature.
6. Immersion for approximately one minute or less, depending on the temperature at which the scale was formed, in a bath of hydrofluoric acid (commercial grade) at room temperature. This particular concentration has been found effective in removing the scale formed on the surface of the metal during heat treating without appreciably attacking or having an injurious effect on the base metal itself.
7. Cold water rinse.
8. Second cold water rinse (optional).
9. Immersion for approximately one minute in a solution containing 3% hydrofluoric acid and 20% nitric acid at room temperature. This bath brightens and passivates the surface of the titanium.
10. Final cold water rinse.
It will be noted that all of the above mentioned operations except alkali cleaning are carried on at room tem- Indeed, the entire process can be carried on by use of ordinary dip tanks and other equipment commonly used in metal working plants.
I have found that fabricated titanium parts that have picked up contamination from dies and scale from heat treating can be easily restored to clean condition and original surface finish without damage by use of the above described cleaning procedure.
I claim:
1. In a process of removing scale from titanium, the step of immersing the metal in a hydrofluoric acid solution of approximately 60% concentration at room temperature.
2. The process of cleaning and descaling titanium after fabrication at high temperature which comprises the following steps:
1. Soak in hot alkali bath;
2. Cold water rinse;
3. Immersion in hydrochloric acid bath of approximately 20% concentration at room temperature;
4. Cold water rinse;
5. Dry;
6. Immersion in hydrofluoric acid bath of approximately 60% concentration at room temperature;
7. Cold water rinse.
3. The process of claim 2, including the additional step of immersing the metal in a bath containing 3% hydrofluoric acid and 20% nitric acid at room temperature.
No references cited.

Claims (1)

1. IN A PROCESS OF REMOVING SCALE FROM TITANIUM, THE STEP OF IMMERSING THE METAL IN A HYDROFLUORIC ACID SOLUTION OF APPROXIMATELY 60% CONCENTRATION AT ROOM TEMPERATURE.
US481963A 1955-01-14 1955-01-14 Process of removing scale from titanium Expired - Lifetime US2724667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US481963A US2724667A (en) 1955-01-14 1955-01-14 Process of removing scale from titanium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US481963A US2724667A (en) 1955-01-14 1955-01-14 Process of removing scale from titanium

Publications (1)

Publication Number Publication Date
US2724667A true US2724667A (en) 1955-11-22

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804407A (en) * 1955-09-06 1957-08-27 Rohr Aircraft Corp Process for descaling titanium
US2827402A (en) * 1955-10-24 1958-03-18 Gen Electric Method of pickling titanium and titanium alloys
US2861015A (en) * 1955-05-27 1958-11-18 North American Aviation Inc Method of descaling titanium
US2875107A (en) * 1956-02-21 1959-02-24 Du Pont Titaniferous ore treatment
US2927855A (en) * 1957-12-31 1960-03-08 Nat Res Corp Separation of tantalum
US2945779A (en) * 1957-03-07 1960-07-19 Lord Mfg Co Treatment of titanium and product, and composition therefor
US2965521A (en) * 1954-06-10 1960-12-20 Crucible Steel Co America Metal pickling solutions and methods
US2974021A (en) * 1957-02-08 1961-03-07 Borowik Albert Process and composition for chemically treating titanium and its alloys
DE1101899B (en) * 1956-11-20 1961-03-09 American Chem Paint Co Acid, aqueous solution for descaling and glazing objects made of titanium, zircon and their alloys
US2981609A (en) * 1956-11-20 1961-04-25 United Aircraft Corp Etching bath for titanium and its alloys and process of etching
US3007780A (en) * 1958-03-20 1961-11-07 Titanium Metals Corp Titanium etching
US3082137A (en) * 1958-12-03 1963-03-19 Gen Motors Corp Method and composition for etching titanium
US3085917A (en) * 1960-05-27 1963-04-16 Gen Electric Chemical cleaning method and material
US3458353A (en) * 1966-11-16 1969-07-29 Alloy Surfaces Co Inc Process of removing coatings from nickel and cobalt base refractory alloys
US3622391A (en) * 1969-04-04 1971-11-23 Alloy Surfaces Co Inc Process of stripping aluminide coating from cobalt and nickel base alloys
US4938850A (en) * 1988-09-26 1990-07-03 Hughes Aircraft Company Method for plating on titanium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965521A (en) * 1954-06-10 1960-12-20 Crucible Steel Co America Metal pickling solutions and methods
US2861015A (en) * 1955-05-27 1958-11-18 North American Aviation Inc Method of descaling titanium
US2804407A (en) * 1955-09-06 1957-08-27 Rohr Aircraft Corp Process for descaling titanium
US2827402A (en) * 1955-10-24 1958-03-18 Gen Electric Method of pickling titanium and titanium alloys
US2875107A (en) * 1956-02-21 1959-02-24 Du Pont Titaniferous ore treatment
US2981609A (en) * 1956-11-20 1961-04-25 United Aircraft Corp Etching bath for titanium and its alloys and process of etching
DE1101899B (en) * 1956-11-20 1961-03-09 American Chem Paint Co Acid, aqueous solution for descaling and glazing objects made of titanium, zircon and their alloys
US2974021A (en) * 1957-02-08 1961-03-07 Borowik Albert Process and composition for chemically treating titanium and its alloys
US2945779A (en) * 1957-03-07 1960-07-19 Lord Mfg Co Treatment of titanium and product, and composition therefor
US2927855A (en) * 1957-12-31 1960-03-08 Nat Res Corp Separation of tantalum
US3007780A (en) * 1958-03-20 1961-11-07 Titanium Metals Corp Titanium etching
US3082137A (en) * 1958-12-03 1963-03-19 Gen Motors Corp Method and composition for etching titanium
US3085917A (en) * 1960-05-27 1963-04-16 Gen Electric Chemical cleaning method and material
US3458353A (en) * 1966-11-16 1969-07-29 Alloy Surfaces Co Inc Process of removing coatings from nickel and cobalt base refractory alloys
US3622391A (en) * 1969-04-04 1971-11-23 Alloy Surfaces Co Inc Process of stripping aluminide coating from cobalt and nickel base alloys
US4938850A (en) * 1988-09-26 1990-07-03 Hughes Aircraft Company Method for plating on titanium

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