US1206075A - Process for rust-proofing metal. - Google Patents
Process for rust-proofing metal. Download PDFInfo
- Publication number
- US1206075A US1206075A US4672115A US4672115A US1206075A US 1206075 A US1206075 A US 1206075A US 4672115 A US4672115 A US 4672115A US 4672115 A US4672115 A US 4672115A US 1206075 A US1206075 A US 1206075A
- Authority
- US
- United States
- Prior art keywords
- rust
- metal
- iron
- bath
- solution
- 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
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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
- 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
- C23C22/18—Orthophosphates containing manganese cations
Definitions
- This invention relates to the rust-proofing of iron and steel, and its object is to provide a bath for the metal which will cause the surface of the metal to be changed uniformly and without blemishes into insoluble basic phosphate which is substantially unaffected upon exposure to moist air.
- This invention is carried out by immersing the metal in a hot acid solution of a salt of manganese, preferably prepared by dissolving manganese phosphate in phosphoric acid.
- the manganese salt may be prepared by dissolving sulfate or chlorid of manganese in water and then adding an equivalent amount of sodium phosphate. The precipitate is then washed until practically .free from sulfates and chlorids, and may then be dried if desired.
- the manganese phosphate is then dissolved in phosphoric acid to saturation and the solution is diluted to an acidity of about one-tenth of one per cent.
- the liquid is brought up to nearly the boiling point and the metal articles to be treated are then immersed.
- a very small amount of the iron will go into solution and some hydrogen will be set free, but after about one half 'hour, this action will be very slight.
- the metal remains in the hot solution for from one to three hours, oruntil all action ceases and the surface ofthe metal is changed to basic phosphates which cannot be penetrated by the acid of the bath.
- the metal articles are then removed, dried, and oiled or otherwise treated as desired.
- Fresh pieces of iron placed in the bath will be acted upon at once until the bath is exhausted.-
- This processv has a great advantage over that employing manganese dioxid, for the solution is clear and can be adjusted as to strength at the beginning to suit the different classes of articles to be acted upon, and being clear, there will substantially be no deposits on the articles inthe bath.
- the bath remains a solution of manganese phosphate until the introduction of iron or steel upsets the equilibrium 'of the solution by some of the iron or steel being dissolved.
- ferrous phosphate is formed in .the bath. Thisabsorbs oxygen from the air which causes the ferrous phosphate to change to ferric phosphate, which is not so soluble and deposits in the form of a white precipitate.
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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)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Chemical Treatment Of Metals (AREA)
Description
NITED STATES PATENT OFFICE.
WILLIAM H. ALLEN, OF DETROIT, MIQHIGAN, ASSIGNOR TO PARKER RU$T PROOF COMPANY 7 OF AMERICA, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.
PROCESS FOR RUST-PROOFING M ETAL.
No Drawing.
To all whom it may concern Be it known that I, WILLIAM H. ALLEN, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Process for Rust-Proofing lMetal, of which the following is a specification.
This invention relates to the rust-proofing of iron and steel, and its object is to provide a bath for the metal which will cause the surface of the metal to be changed uniformly and without blemishes into insoluble basic phosphate which is substantially unaffected upon exposure to moist air.
This invention is carried out by immersing the metal in a hot acid solution of a salt of manganese, preferably prepared by dissolving manganese phosphate in phosphoric acid. The manganese salt may be prepared by dissolving sulfate or chlorid of manganese in water and then adding an equivalent amount of sodium phosphate. The precipitate is then washed until practically .free from sulfates and chlorids, and may then be dried if desired.
The manganese phosphate is then dissolved in phosphoric acid to saturation and the solution is diluted to an acidity of about one-tenth of one per cent. The liquid is brought up to nearly the boiling point and the metal articles to be treated are then immersed. A very small amount of the iron will go into solution and some hydrogen will be set free, but after about one half 'hour, this action will be very slight. The metal remains in the hot solution for from one to three hours, oruntil all action ceases and the surface ofthe metal is changed to basic phosphates which cannot be penetrated by the acid of the bath. The metal articles are then removed, dried, and oiled or otherwise treated as desired.
Specification of Letters Patent.
Patented Nov. 28, 1916.
' Application filed August 21, .1915. Serial No. 46,721.
Fresh pieces of iron placed in the bath will be acted upon at once until the bath is exhausted.- This processv has a great advantage over that employing manganese dioxid, for the solution is clear and can be adjusted as to strength at the beginning to suit the different classes of articles to be acted upon, and being clear, there will substantially be no deposits on the articles inthe bath. The bath remains a solution of manganese phosphate until the introduction of iron or steel upsets the equilibrium 'of the solution by some of the iron or steel being dissolved.
In this'case, as when iron filings in phosphoric acid are used, ferrous phosphate is formed in .the bath. Thisabsorbs oxygen from the air which causes the ferrous phosphate to change to ferric phosphate, which is not so soluble and deposits in the form of a white precipitate.
I claim:
1. The process of rendering articles of iron and steel rust-proof, which consists in immersing the same in a phosphoric acid solution of'a manganese phosphate.
2. The process of rendering articles of -iron and steel rust-proof, which consists in WILLIAM H. ALLEN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4672115A US1206075A (en) | 1915-08-21 | 1915-08-21 | Process for rust-proofing metal. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4672115A US1206075A (en) | 1915-08-21 | 1915-08-21 | Process for rust-proofing metal. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1206075A true US1206075A (en) | 1916-11-28 |
Family
ID=3273996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US4672115A Expired - Lifetime US1206075A (en) | 1915-08-21 | 1915-08-21 | Process for rust-proofing metal. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1206075A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3899365A (en) * | 1972-08-18 | 1975-08-12 | Bridon Ltd | Treatment of steel roping wire |
| US5728235A (en) * | 1996-02-14 | 1998-03-17 | Henkel Corporation | Moderate temperature manganese phosphate conversion coating composition and process |
-
1915
- 1915-08-21 US US4672115A patent/US1206075A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3899365A (en) * | 1972-08-18 | 1975-08-12 | Bridon Ltd | Treatment of steel roping wire |
| US5728235A (en) * | 1996-02-14 | 1998-03-17 | Henkel Corporation | Moderate temperature manganese phosphate conversion coating composition and process |
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