US1957354A - Process of protecting light metals against corrosion - Google Patents
Process of protecting light metals against corrosion Download PDFInfo
- Publication number
- US1957354A US1957354A US607670A US60767032A US1957354A US 1957354 A US1957354 A US 1957354A US 607670 A US607670 A US 607670A US 60767032 A US60767032 A US 60767032A US 1957354 A US1957354 A US 1957354A
- Authority
- US
- United States
- Prior art keywords
- light metals
- against corrosion
- protecting light
- metals against
- fluoride
- 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
Links
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
- C23C22/68—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 solutions with pH between 6 and 8
Definitions
- the present invention has for its objecta process allowing to form a protecting layer, very resistant to corrosion, on aluminiumymagnesium and their alloys.
- An extremely satisfactory protection is obtained according to the present process by causing to react, on parts formed of light metals or alloys, an aqueous solution of one or more complex neutral soluble salts, the anion of which compulsorily comprises the fluorine element combined with one or more other elements, the cathion being of any nature, but one of the constituent elements of the salt being placed above aluminium in the se- 20 ries of electro-chemical potentials.
- the rapidity and efiiciency of the reaction increase with the temperature and reach their maximum at boiling point.
- the duration of treatment of the metal with the bath is substantially of to minutes. It can be prolongated until the end of the reaction.
- Protecting coatings obtained in such baths have a high resistance to the usual oxidation agents and in particular to the saline mist and to the saline solution of perhydrol.
- the parts treated according to this process are preferably subsequently coated with another protecting layer which can be composed of greases, oils, waxes, gums, tar, etc.
- the present process is not limited to the above mentioned conditions and the quality and aspect of the protecting layer can be varied by modifying the concentration of the bath, or the temperature or duration of treatment, etc.
- Process for the formation of coatings for preventing the oxidation on articles made of light metals or alloys such as aluminum, magnesium which consists in immersing the said articles in a solution comprising about 2 parts of double fluoride of potassium and titanium, 1 part of chromium fluoride and A; part of fluoride of sodium for 1000 parts of water.
Landscapes
- 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)
- Chemical Treatment Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
atented May I, 1934 PRDCESS F PROTECTING LIGHT METALS AGAINST CORROSION Pierre Prior,
Paris, France No Drawing. Application April 26,1932, Serial No. 607,670. In France April 2'], 1931 2 Claims.
It is known to protect light metals and alloys either by formation of a layer of oxide by means of an electric current in the midst of a conducting solution, or by deposition of metallic oxides, with 5 or without salt solution.
The present invention has for its objecta process allowing to form a protecting layer, very resistant to corrosion, on aluminiumymagnesium and their alloys.
An extremely satisfactory protection is obtained according to the present process by causing to react, on parts formed of light metals or alloys, an aqueous solution of one or more complex neutral soluble salts, the anion of which compulsorily comprises the fluorine element combined with one or more other elements, the cathion being of any nature, but one of the constituent elements of the salt being placed above aluminium in the se- 20 ries of electro-chemical potentials.
The addition of bodies adapted to dissolve or precipitate the secondary bodies formed by the reaction (such as tartrates, citrates, fluorides, etc.,) can be eiiected without modifying the protection provided by the present process. These additions are not indispensable and 'do not constitute the essential feature of the present invention.
The rapidity and efiiciency of the reaction increase with the temperature and reach their maximum at boiling point.
The duration of treatment of the metal with the bath is substantially of to minutes. It can be prolongated until the end of the reaction.
The following examples are given by way of indication and not in a limiting sense.
Example I 10 grs.
It has been found that the quantity of each of the constituents can vary within wide limits,
but the best results have been obtained by means current, in the midst of an alkali and of a solution composedaccording to the second above example.
It has also been found that the bath can be con= tinuously used by eliminating the totality or a portion of the chemical compounds which are formed during the reaction by simple reagents containing in the anion the fluorine element and capable or not of generating the complex salts such as they are above defined.
By way of indication, the continuous action of the bath of the second above example can be ensured byaddition of titanium fluoride.
Protecting coatings obtained in such baths have a high resistance to the usual oxidation agents and in particular to the saline mist and to the saline solution of perhydrol.
The parts treated according to this process are preferably subsequently coated with another protecting layer which can be composed of greases, oils, waxes, gums, tar, etc.
The present process is not limited to the above mentioned conditions and the quality and aspect of the protecting layer can be varied by modifying the concentration of the bath, or the temperature or duration of treatment, etc.
I claim: 0
1. Process for the formation of coatings for preventing the oxidation on articles made of light metals or alloys such as aluminum, magnesium; which consists in immersing the said articles in a solution comprising about 2 parts of double fluoride of potassium and titanium, 1 part of chromium fluoride and A; part of fluoride of sodium for 1000 parts of water.
.2. Process for the formation of coatings for preventing the oxidation on'articles made of light metals or alloys such as aluminium, magnesium, which consists in immersing the said articles in a solution comprising about 2 parts of double fluoride of potassium and titanium, 1 part of chromium fluoride and part of fluoride of sodium for 1000 parts of water, and in gradually adding fluoride of titanium to the said solution in the course of its use.
PIERRE PRIER.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR732230T | 1931-04-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1957354A true US1957354A (en) | 1934-05-01 |
Family
ID=9121175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US607670A Expired - Lifetime US1957354A (en) | 1931-04-27 | 1932-04-26 | Process of protecting light metals against corrosion |
Country Status (4)
Country | Link |
---|---|
US (1) | US1957354A (en) |
BE (1) | BE388139A (en) |
FR (1) | FR732230A (en) |
GB (1) | GB392728A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE764929C (en) * | 1938-11-09 | 1954-04-05 | Bosch Gmbh Robert | Process for producing fluoride-containing protective layers on workpieces made of magnesium and its alloys |
US2836525A (en) * | 1956-05-18 | 1958-05-27 | American Chem Paint Co | Method of and composition for coating zirconium |
US2851385A (en) * | 1952-04-03 | 1958-09-09 | Amchem Prod | Process and composition for coating aluminum surfaces |
US2946728A (en) * | 1955-06-23 | 1960-07-26 | Cleveland Pneumatic Ind Inc | Adherent electroplating on titanium |
US2955061A (en) * | 1957-08-02 | 1960-10-04 | Parker Rust Proof Co | Fluoride coating on zirconium |
US3090709A (en) * | 1953-08-10 | 1963-05-21 | Lubrizol Corp | Phosphate coating of metals |
EP1318212A1 (en) * | 2001-11-07 | 2003-06-11 | Henkel Kommanditgesellschaft auf Aktien | Agents and methods for the surface treatment of zinc-based coatings |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE750367C (en) * | 1936-02-26 | 1945-01-16 | Process for the production of corrosion-resistant coatings on magnesium and its alloys | |
US2431595A (en) * | 1942-08-06 | 1947-11-25 | Aluminum Co Of America | Method for cleaning aluminum |
US4148670A (en) * | 1976-04-05 | 1979-04-10 | Amchem Products, Inc. | Coating solution for metal surface |
-
0
- BE BE388139D patent/BE388139A/xx unknown
-
1931
- 1931-04-27 FR FR732230D patent/FR732230A/en not_active Expired
-
1932
- 1932-04-26 GB GB12006/32A patent/GB392728A/en not_active Expired
- 1932-04-26 US US607670A patent/US1957354A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE764929C (en) * | 1938-11-09 | 1954-04-05 | Bosch Gmbh Robert | Process for producing fluoride-containing protective layers on workpieces made of magnesium and its alloys |
US2851385A (en) * | 1952-04-03 | 1958-09-09 | Amchem Prod | Process and composition for coating aluminum surfaces |
DE977586C (en) * | 1952-04-03 | 1967-06-08 | Amchem Prod | Process for the production of coatings on aluminum and its alloys |
US3090709A (en) * | 1953-08-10 | 1963-05-21 | Lubrizol Corp | Phosphate coating of metals |
US2946728A (en) * | 1955-06-23 | 1960-07-26 | Cleveland Pneumatic Ind Inc | Adherent electroplating on titanium |
US2836525A (en) * | 1956-05-18 | 1958-05-27 | American Chem Paint Co | Method of and composition for coating zirconium |
US2955061A (en) * | 1957-08-02 | 1960-10-04 | Parker Rust Proof Co | Fluoride coating on zirconium |
EP1318212A1 (en) * | 2001-11-07 | 2003-06-11 | Henkel Kommanditgesellschaft auf Aktien | Agents and methods for the surface treatment of zinc-based coatings |
Also Published As
Publication number | Publication date |
---|---|
FR732230A (en) | 1932-09-15 |
BE388139A (en) | |
GB392728A (en) | 1933-05-25 |
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