US1247086A - Method of coating metallic articles to prevent oxidation. - Google Patents

Method of coating metallic articles to prevent oxidation. Download PDF

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Publication number
US1247086A
US1247086A US1903915A US1903915A US1247086A US 1247086 A US1247086 A US 1247086A US 1903915 A US1903915 A US 1903915A US 1903915 A US1903915 A US 1903915A US 1247086 A US1247086 A US 1247086A
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Prior art keywords
bath
articles
black
prevent oxidation
metallic articles
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Expired - Lifetime
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US1903915A
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Myron L Crowe
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    • 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
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/70Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using melts

Definitions

  • My process which accomplishes the desired purpose, consists in dipping the articles to be treated in a molten bath of caustic alkali and a nitrate of the alkali metals.
  • caustic potash and potassium nitrate I may use caustic potash and potassium nitrate, I preferably employ sodium hydroxid and sodium nitrate because of the excellent results secured loy their use. I employ these two substances in approximately the proportion of two parts by bulk of the nitrate to three parts of the hydrate,
  • the articles to be. treated such as chains, parts of typewriting or other machines, fire arms, cutlery, hardward, etc.
  • the articles to be. treated are dipped into the molten bath for an instantsay for a period of. from 1 to 10 secondsbut usually from 3 to 5 seconds, and they are then withdrawn.
  • the efiect of which is to remove any of the material of the first bath which may have lodged in the crevices or corners, if there be any, in the article. Then the article is dried n sawdust or by any other approved method, and
  • a method of imparting a black or suhstantially black rust-resistant finish to articles of steel or iron which includes immersing them in a bath .of molten sodium hydroxid and sodium nitrate heated to a temperature of approximately not less than 900 F.
  • a method of imparting a black or substantially black rust-resistant finish to articles of iron or steel which consists in immersing them in a bath of sodium hydroxid and sodium nitrate heated to approximately not less than 900 F., and immersing the same in boiling water to remove the excess ⁇ )naterial left upon the articles from the first ath.

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Description

MYBON L-CEOWE, 0F HOLLISTON, MASSACHUSETTS.
mn'rnon or coarrne' ia'n'rarnrc narrows TO PREVENT oxrne'rron.
No Drawing.
To all whom it may concern:
Be it known that I, MYRONL. Crown, a
citizen of the United States, and a resident manufacture, or parts thereof, constructed of iron or steel, so as to formthereon a black or dark-colored finish or coating which is rust-resistant and which improves the appearance thereof.
My process, which accomplishes the desired purpose, consists in dipping the articles to be treated in a molten bath of caustic alkali and a nitrate of the alkali metals. Although I may use caustic potash and potassium nitrate, I preferably employ sodium hydroxid and sodium nitrate because of the excellent results secured loy their use. I employ these two substances in approximately the proportion of two parts by bulk of the nitrate to three parts of the hydrate,
but I may vary the proportions within fairly wide limits without noticeable change in the result upon the articles undergoing treatment. These two substances in dry form are thoroughly mixed, and after being placed in a suitable receptacle, are heated to a temperature of from 900 to 1200 F. They fuse at approximately 400 F. and when they reach 900 F. a scum appears which I have noted as roughly indicating that the bath is ready for use.
The articles to be. treated, such as chains, parts of typewriting or other machines, fire arms, cutlery, hardward, etc., are dipped into the molten bath for an instantsay for a period of. from 1 to 10 secondsbut usually from 3 to 5 seconds, and they are then withdrawn. Then I dip the article into a bath of water, for cooling purposes, this taking but an instant, and then I immerse it into boiling water for a short time,
say for three or four minutes, the efiect of which is to remove any of the material of the first bath which may have lodged in the crevices or corners, if there be any, in the article. Then the article is dried n sawdust or by any other approved method, and
Specification of Letters Patent. Pat gmted Nimy, 2t}, 1911?, Application filed April 3, 1915. Serial No. 19,039;
then is immersed for a few moments, say 2 or 3 mlnutes, in a bath of boiling oil of any sultable klnd. I may for example use lard oil, cotton seed oil, orother equivalent material.
AS a result of the treatment I have descr1bed, the article will have formed thereon a black'or nearly black finish, which islustrous or dull according to Whether or not the article had becn'previously polished. Iron or steel articles so treated are rust resistant, present an attractive appearance,
being black or substantially so, and, due.
to the heat of the first bath and the subsequent step, have a hardened exterior. The process is very cheap and takes very little time.
Having thus explained the nature of my said invention, and described a way of makmg and using the same, although without attempting to set forth all of the forms in which it may be made or all of the modes of its use, what Iclaim is 1. A method of imparting a black or substantially black rust-resistant finish to articles of iron or steel, which includes immersing them momentarily in a bath consisting v of a mixture of molten nitrate of the alkali I metals and caustic alkali.
2. A method of imparting a black or suhstantially black rust-resistant finish to articles of steel or iron, which includes immersing them in a bath .of molten sodium hydroxid and sodium nitrate heated to a temperature of approximately not less than 900 F.
3. A method of imparting a black or substantially black rust-resistant finish to articles of iron or steel, which consists in immersing them in a bath of sodium hydroxid and sodium nitrate heated to approximately not less than 900 F., and immersing the same in boiling water to remove the excess {)naterial left upon the articles from the first ath.
- 4. A method of imparting a black or sub- .stantially black rust resistant finish to articles of iron" or steel, which consists inimmersing them in a bath of sodium hydroxid and sodium nitrate heated to approximately not less than 900 F., immersing the samestantia-Hy black rust-resistant finish 11:0 artidies of iron or steel, which consists in immersing them in a bath of sodium hydroxid and sodium nitrate heated to approximately not less than 900 F, immersmg the same in boiling water, coolin the same by immersion 1n Wmer, removlng the excess material left from the first bath by immersing;
neemoee them in boilingwater, drying said. articles,
and immersing them in boiling oil.
In testimony whereof I have afiixed my signature, in presence oftwo Witnesses.
v MYRON L. CRDWE.
Witnesses: Gnome CHANDLER Com,
CHESTER A. REED.
US1903915A 1915-04-03 1915-04-03 Method of coating metallic articles to prevent oxidation. Expired - Lifetime US1247086A (en)

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US1903915A US1247086A (en) 1915-04-03 1915-04-03 Method of coating metallic articles to prevent oxidation.

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US1903915A US1247086A (en) 1915-04-03 1915-04-03 Method of coating metallic articles to prevent oxidation.

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US1247086A true US1247086A (en) 1917-11-20

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422902A (en) * 1942-02-24 1947-06-24 Western Electric Co Method of electrolytically cleaning and plating conductors consisting principally of copper
US2431986A (en) * 1942-07-22 1947-12-02 American Rolling Mill Co Coloring stainless steel
US2458661A (en) * 1944-01-29 1949-01-11 J H Shoemaker Process of cleaning metal surfaces and compositions therefor
US2465443A (en) * 1945-08-03 1949-03-29 Gide Rene Treatment of magnesium and magnesium alloy articles to increase their resistance to corrosion
US2538702A (en) * 1944-06-02 1951-01-16 Freeport Sulphur Co Metal surface cleaning
US2639244A (en) * 1950-07-15 1953-05-19 Remington Arms Co Inc Metal finishing method
US2671717A (en) * 1950-08-29 1954-03-09 Gen Electric Chemical brightening of aluminum
US2678290A (en) * 1946-09-05 1954-05-11 Pottberg Rolfe Process of removing surface oxide films on metal
US3313659A (en) * 1966-02-10 1967-04-11 Continental Oil Co Oxide coatings on metals
US3847685A (en) * 1970-02-11 1974-11-12 Texas Instruments Inc Oxide coated metal discs and method of making the same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422902A (en) * 1942-02-24 1947-06-24 Western Electric Co Method of electrolytically cleaning and plating conductors consisting principally of copper
US2431986A (en) * 1942-07-22 1947-12-02 American Rolling Mill Co Coloring stainless steel
US2458661A (en) * 1944-01-29 1949-01-11 J H Shoemaker Process of cleaning metal surfaces and compositions therefor
US2538702A (en) * 1944-06-02 1951-01-16 Freeport Sulphur Co Metal surface cleaning
US2465443A (en) * 1945-08-03 1949-03-29 Gide Rene Treatment of magnesium and magnesium alloy articles to increase their resistance to corrosion
US2678290A (en) * 1946-09-05 1954-05-11 Pottberg Rolfe Process of removing surface oxide films on metal
US2639244A (en) * 1950-07-15 1953-05-19 Remington Arms Co Inc Metal finishing method
US2671717A (en) * 1950-08-29 1954-03-09 Gen Electric Chemical brightening of aluminum
US3313659A (en) * 1966-02-10 1967-04-11 Continental Oil Co Oxide coatings on metals
US3847685A (en) * 1970-02-11 1974-11-12 Texas Instruments Inc Oxide coated metal discs and method of making the same

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