US2346562A - Method of removing carbonized oil residue from magnesium articles - Google Patents

Method of removing carbonized oil residue from magnesium articles Download PDF

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Publication number
US2346562A
US2346562A US364691A US36469140A US2346562A US 2346562 A US2346562 A US 2346562A US 364691 A US364691 A US 364691A US 36469140 A US36469140 A US 36469140A US 2346562 A US2346562 A US 2346562A
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Prior art keywords
magnesium
articles
oil residue
carbonized oil
magnesium articles
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Expired - Lifetime
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US364691A
Inventor
Long Herbert K De
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Dow Chemical Co
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Dow Chemical Co
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Priority to US364691A priority Critical patent/US2346562A/en
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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
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/22—Light metals

Definitions

  • This-invention relates to a method of cleaning articles of magnesium and magnesium-base alloys.
  • oils are, in part, decomposed or oxidized by the combined action of heat, air, and the magnesium surface, and are converted to gummy, carbonized materials, which, for present purposes, may be termed oil residues."
  • oil residues which also may be formed when oil-coated magnesium articles are exposed-to the atmosphere for longperiods or time, tend to detract from the appearance and usefulness of the final product, and; should be removed.
  • wire brushing is virtually without effect on the 011 residues, and ordinary alkaline cleaners and degreasing solvents, although they loosen the residues somewhat, do not remove them satisfactorily.
  • any water-soluble salt of tartaric acid may be used in theprocess, alkali metal tartrates such as sodium tartrate, sodium bitartrate, and Rochelle salt having been found particularly suitable.
  • the tartrate shouldpreferably be present in the solution in a concentration between about 1 and about 5 per cent by Application November 7, 1940, Serial N0. 364,691
  • metal hydroxides e. g. sodium hydroxide
  • the alkaline agent is ordinarily, though not necessarily, added to the solution in a proportion between about 1 and about 5 per cent by weight.
  • the treating solutions ordinarily contain only the tartrate and the alkali as eiiectlve ingredients, other substances maybe added without departing from the invention.
  • a soluble detergent such as a soap or a salt of a suliated higher aliphatic alcohol or of a sulfonated aromatlc hydrocarbon.
  • magnesium-base oil residues are reweight, although other proportions are operable
  • the tartratesolution may be made alkaline by any soluble basic-acting agent, although in general the stronger bases, such as trisodium phosphate, sodium carbonate, hydroxide, and the like,

Description

' fro Patented Apr. 11, 1944 p METHOD OF REMOVING omnomzsn on.
RESIDUE FROM MAGNESIUM ARTICLES Herbert K. De Long, Midland, Mich, assignor The Dow Chemical Company, Midland, Mich, a corporation of Michigan No Drawing.
2 Claims.
This-invention relates to a method of cleaning articles of magnesium and magnesium-base alloys.
In certain processes for fabricating articles m magnesium and magnesium-base alloys, as by rolling. extrusion, drawing, and the like, practice occasionally demands that lubricants, usually mineral or vegetable'oils, be used to facilitate operation. These oils tend to coat the surface of the resulting articles. Then, if the article is heat treated o otherwise subjected to elevated temperatures during or after the particular fabrication process involved, the oils are, in part, decomposed or oxidized by the combined action of heat, air, and the magnesium surface, and are converted to gummy, carbonized materials, which, for present purposes, may be termed oil residues." These residues, which also may be formed when oil-coated magnesium articles are exposed-to the atmosphere for longperiods or time, tend to detract from the appearance and usefulness of the final product, and; should be removed. However, wire brushing is virtually without effect on the 011 residues, and ordinary alkaline cleaners and degreasing solvents, although they loosen the residues somewhat, do not remove them satisfactorily. I
It is therefore an object of the present invention to provide a simple, inexpensive, and effective method of removing 011 residues from articles of magnesium and magnesium-base alloys.
According to the invention, moved from magnesium and magnesium-base alloy articles by subjecting the articles to the action of an aqueous alkaline solution of a, tartrate. In so far as is known, any water-soluble salt of tartaric acid may be used in theprocess, alkali metal tartrates such as sodium tartrate, sodium bitartrate, and Rochelle salt having been found particularly suitable. The tartrate shouldpreferably be present in the solution in a concentration between about 1 and about 5 per cent by Application November 7, 1940, Serial N0. 364,691
metal hydroxides, e. g. sodium hydroxide, are greatly to be preferred. The alkaline agent is ordinarily, though not necessarily, added to the solution in a proportion between about 1 and about 5 per cent by weight.
Whilethe treating solutions ordinarily contain only the tartrate and the alkali as eiiectlve ingredients, other substances maybe added without departing from the invention. Thus, in cleaning articles having on their surface a considerable film of oil in addition to oil residues, it is desirable to add to the tartrate solution 0.5 to 2.0 per cent by weight or more of a soluble detergent, such as a soap or a salt of a suliated higher aliphatic alcohol or of a sulfonated aromatlc hydrocarbon.
' magnesium-base oil residues are reweight, although other proportions are operable,
in most instances. a
The tartratesolution may be made alkaline by any soluble basic-acting agent, although in general the stronger bases, such as trisodium phosphate, sodium carbonate, hydroxide, and the like,
tetramethyl ammonium and especially the alkali In cleaning oil-residue coated magnesium and alloy articles, it is necessary only to dip the article in the cleaning solution for a short time, and then to withdraw it and rinse it in water. When the olution is hot, as at -100 (2., a simple dip for Q5 seconds ('02 minutes suiiices to remove all, the oil residue. However, if the solution is at room temperature, strong agitation cleaned electrolytically, cathode of a cell in which solution is the electrolyte.
It is to be understood that the foregoing de scription is illustrative rather than strictly limitartrate and between about 1 and about 5 per cent of an alkali metal thereafter rinsing and drying the article.
2. The method according to claim 1 wherein thealkaline tartrate solution is maintained at a temperature 01' 90 to C. l
a rrnannar K. DE LONG. I
hydroxide,
US364691A 1940-11-07 1940-11-07 Method of removing carbonized oil residue from magnesium articles Expired - Lifetime US2346562A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437474A (en) * 1944-03-24 1948-03-09 Gilbert H Orozco Method of anodic cleaning
US2584017A (en) * 1952-01-29 Washing composition
US2615846A (en) * 1952-10-28 Washing composition
US2653882A (en) * 1951-03-10 1953-09-29 Shell Dev Cleaning and inhibiting corrosion of metal tanks of ships
US2702042A (en) * 1948-01-23 1955-02-15 Sigmund J Smith Article cleaning and drying machine
US2852419A (en) * 1946-01-07 1958-09-16 Donald C Overholt Process of decontaminating material contaminated with radioactivity
US3047508A (en) * 1960-02-26 1962-07-31 Fuentes Daniel Metal cleaning composition
US3087841A (en) * 1958-11-03 1963-04-30 Dow Chemical Co Method of treating magnesium metal article prior to spotwelding
US3168454A (en) * 1961-06-28 1965-02-02 Debe Anthony Method of making catalytic agent for plating bath
US3234047A (en) * 1962-02-05 1966-02-08 Everette C Olson Method of cleaning carbon and combustion deposits from spark plugs
EP0184342A1 (en) * 1984-11-23 1986-06-11 Alcan International Limited Destroying halogen containing organic compounds
EP2348142A1 (en) 2010-01-25 2011-07-27 Dominion Engineering, Inc. Method and composition for removing scale deposits formed on a metal surface within a steam generating system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2584017A (en) * 1952-01-29 Washing composition
US2615846A (en) * 1952-10-28 Washing composition
US2437474A (en) * 1944-03-24 1948-03-09 Gilbert H Orozco Method of anodic cleaning
US2852419A (en) * 1946-01-07 1958-09-16 Donald C Overholt Process of decontaminating material contaminated with radioactivity
US2702042A (en) * 1948-01-23 1955-02-15 Sigmund J Smith Article cleaning and drying machine
US2653882A (en) * 1951-03-10 1953-09-29 Shell Dev Cleaning and inhibiting corrosion of metal tanks of ships
US3087841A (en) * 1958-11-03 1963-04-30 Dow Chemical Co Method of treating magnesium metal article prior to spotwelding
US3047508A (en) * 1960-02-26 1962-07-31 Fuentes Daniel Metal cleaning composition
US3168454A (en) * 1961-06-28 1965-02-02 Debe Anthony Method of making catalytic agent for plating bath
US3234047A (en) * 1962-02-05 1966-02-08 Everette C Olson Method of cleaning carbon and combustion deposits from spark plugs
EP0184342A1 (en) * 1984-11-23 1986-06-11 Alcan International Limited Destroying halogen containing organic compounds
EP2348142A1 (en) 2010-01-25 2011-07-27 Dominion Engineering, Inc. Method and composition for removing scale deposits formed on a metal surface within a steam generating system

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