US1572354A - Rustproofing bath for iron and steel - Google Patents

Rustproofing bath for iron and steel Download PDF

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Publication number
US1572354A
US1572354A US559599A US55959922A US1572354A US 1572354 A US1572354 A US 1572354A US 559599 A US559599 A US 559599A US 55959922 A US55959922 A US 55959922A US 1572354 A US1572354 A US 1572354A
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Prior art keywords
bath
iron
steel
sodium
rustproofing
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US559599A
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James H Gravell
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    • 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
    • C23C—COATING 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
    • C23C22/00—Chemical 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
    • C23C22/05—Chemical 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 aqueous solutions
    • C23C22/06—Chemical 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 aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical 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 aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates

Definitions

  • This invention relates to rust proofing iron and steel and the object of the invention is'to provide an improved bath compound for the purpose, whereby the rust proofing may be done more effectively and less care need be exercised in maintaining the bath in proper working condition.
  • the articles to be rust proofed are immersed in a hot, weak solution of phosphoric acid and water until a substantial coating of-iron phosphate is formed and the time required varies, in practice, from one to several hours. s
  • Phosphoric acid (85%) 100 Metallic sodium 4
  • the sodium dissolves forming monosodium phosphate in the acld.
  • the prepared acid thus formed is used pickling there is sufficient acid carried over- 'in the regular way in preparing the rust proofing bath.
  • the sodium in the solution changes the free sulphuric and other pickling and like acids into the sodium salts of these acids and these salts remain dissolved in the solution and do not precipitate to form a sludge at the bottom of the tanks.
  • the ill effects of the foreign acids are destroyed without danger of causing a sludge to form on the work or to accumulate in the bottom of the tank.
  • My compound is used in the same way as unprepared phosphoric acid and meets all the requirements even when manganese dioxide or zinc phosphate or both are added to the bath which is often done in practice.
  • the phosphoric acid may be made from material containing sodium so proportioned that the requisite amount of sodium will be present in the phosphoric acid when it is manufactured.
  • magnesium and potassium may be used instead of the sodium and it is understood that in the claims the term sodium includes also magnesium andpotassium, or
  • A* bath for rust proofing comprising water, free phosphoric acid and monosodium phosphate which combining with pickling and foreign acids opposes the for-' maticn of a sludge.

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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

Patented Feb. 9, 1926.
UNITED STATES JAMES H. GRAVELL, F ELKINS PARK, PENNSYLVANIA.
RUSTPROOFING BATH FOR IRON AND STEEL No Drawing. Application filed May 9, 1922, Serial No. 559,599. Renewed November 3, 1925.
To all whom it may concern:
Be it known that 1, JAMES H. GRAVELL, a citizen of the United States, residing at Elkins Park, in the county of Montgomery and State of Pennsylvania, have invented a new and useful Improvement in Rustproofing Baths for Iron and Steel, of which the following is a specification. 1
This invention relates to rust proofing iron and steel and the object of the invention is'to provide an improved bath compound for the purpose, whereby the rust proofing may be done more effectively and less care need be exercised in maintaining the bath in proper working condition.
According to the rust proofing process to which this invention is applicable, the articles to be rust proofed are immersed in a hot, weak solution of phosphoric acid and water until a substantial coating of-iron phosphate is formed and the time required varies, in practice, from one to several hours. s
This process is satisfactory where the surface of the articles is perfectly free from acids, for example, where the metal articles have been sand blasted, but where the work has been prepared for rust proofing by Pounds.
Phosphoric acid (85%) 100 Metallic sodium 4 The sodium dissolves forming monosodium phosphate in the acld.
The prepared acid thus formed is used pickling there is sufficient acid carried over- 'in the regular way in preparing the rust proofing bath.
The sodium in the solution changes the free sulphuric and other pickling and like acids into the sodium salts of these acids and these salts remain dissolved in the solution and do not precipitate to form a sludge at the bottom of the tanks. The ill effects of the foreign acids are destroyed without danger of causing a sludge to form on the work or to accumulate in the bottom of the tank.
My compound is used in the same way as unprepared phosphoric acid and meets all the requirements even when manganese dioxide or zinc phosphate or both are added to the bath which is often done in practice.
It will be evident to those skilled in the art that the metallic sodium may be replaced by chemical equivalents such as mon o-, di-, or tri-sodium phosphate without departing from the spirit of the invention,
-and the phosphoric acid may be made from material containing sodium so proportioned that the requisite amount of sodium will be present in the phosphoric acid when it is manufactured. My experience indicates that magnesium and potassium may be used instead of the sodium and it is understood that in the claims the term sodium includes also magnesium andpotassium, or
combinations of sodium, magnesium and potassium.
I claim:
1. A* bath for rust proofing comprising water, free phosphoric acid and monosodium phosphate which combining with pickling and foreign acids opposes the for-' maticn of a sludge.
2. The method of rust proofing a metallic surface which consists in forming a substantial coatingof iron phosphate on the surface by subjecting the surface to the action of a bath containing mono-sodium phosphate. free phosphoric acid and water, substantially as described.
JAMES H. GRAVE; i,
till
US559599A 1922-05-09 1922-05-09 Rustproofing bath for iron and steel Expired - Lifetime US1572354A (en)

Priority Applications (1)

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US559599A US1572354A (en) 1922-05-09 1922-05-09 Rustproofing bath for iron and steel

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US559599A US1572354A (en) 1922-05-09 1922-05-09 Rustproofing bath for iron and steel

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870066A (en) * 1956-08-01 1959-01-20 Shell Dev Condensation and separation process
US2901438A (en) * 1956-10-25 1959-08-25 Union Carbide Corp Corrosion inhibitors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870066A (en) * 1956-08-01 1959-01-20 Shell Dev Condensation and separation process
US2901438A (en) * 1956-10-25 1959-08-25 Union Carbide Corp Corrosion inhibitors

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