US2559878A - Zinc and cadmium passivating bath - Google Patents
Zinc and cadmium passivating bath Download PDFInfo
- Publication number
- US2559878A US2559878A US68069A US6806948A US2559878A US 2559878 A US2559878 A US 2559878A US 68069 A US68069 A US 68069A US 6806948 A US6806948 A US 6806948A US 2559878 A US2559878 A US 2559878A
- Authority
- US
- United States
- Prior art keywords
- zinc
- parts
- solution
- bath
- water
- 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
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 21
- 229910052725 zinc Inorganic materials 0.000 title claims description 20
- 239000011701 zinc Substances 0.000 title claims description 20
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims description 19
- 229910052793 cadmium Inorganic materials 0.000 title claims description 17
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 17
- 229910017604 nitric acid Inorganic materials 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 8
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 claims description 8
- 235000015217 chromium(III) sulphate Nutrition 0.000 claims description 8
- 239000011696 chromium(III) sulphate Substances 0.000 claims description 8
- OIDPCXKPHYRNKH-UHFFFAOYSA-J chrome alum Chemical compound [K]OS(=O)(=O)O[Cr]1OS(=O)(=O)O1 OIDPCXKPHYRNKH-UHFFFAOYSA-J 0.000 claims description 7
- 150000003839 salts Chemical class 0.000 claims description 7
- 238000007598 dipping method Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-PWCQTSIFSA-N Tritiated water Chemical compound [3H]O[3H] XLYOFNOQVPJJNP-PWCQTSIFSA-N 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 238000005260 corrosion Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 238000005282 brightening Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000011253 protective coating Substances 0.000 description 3
- 150000001844 chromium Chemical class 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/04—Heavy metals
- C23F3/06—Heavy metals with acidic solutions
-
- 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
- C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/53—Treatment of zinc or alloys based thereon
-
- 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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
Definitions
- This invention relates to a method of inhibiting corrosion and brightening the surface of zinc and cadmium parts, and to a bath for use in such a method.
- parts which have been electroplated with either cadmium or zinc are dipped for a short time in a bath comprising essentially a trivalent salt of chromium with a small percentage of nitrate in water.
- zinc or cadmium parts or parts which have been electroplated with either zinc or cadmium, may be given a lustrous substantially transparent surface which is relatively corrosion resistant if the parts are dipped in a water solution of trivalent chromium salt to which a nitrate has been added and held therein from to 20 seconds while the bath is maintained at a temperature of from 50 to 130 F.
- the bath comprises a water solution of 1 ounce of chrome alum (KzCrz(SO'4)424I-IzO) for each gallon of water to which 5% nitric acid (HNOs) by volume is added.
- the bath may consist of 1 ounce of chromic sulphate in a gallon of water to which is added from'.1% to .75% by volume of nitric acid (HNOs).
- HNOs nitric acid
- the passivating bath need not be used in connection with a plating process and may be used as a passivating solution on cadmium or zinc parts which are formed from solid metals, or the passivating may be effected on zinc or cadmium coated or plated parts at any time subsequent to the plating of the parts.
- a water solution of trivalent chromium salts in the range of /2 to 1 ounce per gallon of water and to which nitric acid of 1.42 specific gravity has been added in an amount from .1% to 375% by volume of the solution provides a suitable passivating and brightening bath.
- the nitric acid in such baths, as indicated in the first example should comprise approximately .5% by volume of the bath.
- the method of passivating zinc and cadmium surfaces of parts which consists in dipping the parts in a water solution of chrome alum and nitric acid wherein approximately one ounce of chrome alum is used for each gallon of water and the nitric acid comprises approximately .5% by volume of the solution, holding the parts in said solution for from 5 to 20 seconds while maintaining the temperature of the solution at from 50 to F.
- a water solution for forming a protective coating on zinc or cadmium surfaces consisting of an acidified solution of chrome alum and nitric acid in water, wherein the chrome alum constitutes approximately 1 ounce for each gallon of water, and the nitric acid constitutes approximately .5% by volume of the bath.
- a water solution for forming a protective coating on zinc or cadmium consisting of chromic sulphate (CI2(SO4)318H2O) and nitric acid in water, wherein one ounce of chromic sulphate is used for each gallon of water and .5% by volume of nitric acid is added to the solution.
- a water solution for forming a protective coating on zinc or cadmium consisting of from to 1 ounce of chromic sulphate V (Crz (S04) 318H2O') in water to which there is added from 1% to .75% of nitric acid by volume.
- the method of passivating zinc and cadmium surfaces of parts which consists in dipping the parts in a solution of a trivalent salt of chromium selected from the group consisting and holding the parts in the solution for from 5 to 20 seconds while maintaining the solution at from 50 F. to 130 F.
- the method of passivating zinc and chromium surfaces of parts which consists in dipping the parts in a bath consisting of a water solution of chromic sulphate in nitric acid, wherein approximately one ounce of chromic sul phate is used for each gallon of water, and the nitric acid comprises from .l% to .75% by volume of the solution, holding the parts in said bath for from 5 to 20 seconds, and maintaining the bath temperature at from 50 F. to 130 F.
- a solution for use as a passivation bath for zinc or cadmium surfaces consisting of a trivalent salt of chromium selected from the group 7 consisting of chrome alum and chromic sulphate,
- the salt of chromium constitutes approximately one ounce for each gallon of water and the nitric acid constitutes from .1% to by volume of the bath.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Patented July 10, 1951 ZINC AND CADIVHUM PASSIVATIN G BATH Donald M. Johnson, Cicero, Ill., assignor to Western Electric Company, Incorporated, New York, N. Y.,, a corporation of New York No Drawing. Application December 29, 1948, Serial No. 6,069
7 Claims. 1
This invention relates to a method of inhibiting corrosion and brightening the surface of zinc and cadmium parts, and to a bath for use in such a method.
In the past numerous processes have been proposed for passivating or inhibiting the corrosion .of parts either made from cadmium or zinc or plated with cadmium or zinc and suitable baths have been devised for use in such processes. However, these previously suggested methods used costly materials, primarily concentrated solutions of hexavalent chromium, and when a satisfactory result from a corrosion inhibition standpoint was achieved, an iridescent, drab or highly colored surface was produced. To produce a light colored, bright surface, an additional operation was necessary to bleach the coating. This resulted in a decrease in the degree of corrosion inhibition.
It is an object of the present invention to provide an inexpensive brightening and corrosion inhibiting method in one bath and a bath therefor which will produce zinc or cadmium coated parts having protective qualities consistent with the production of a finish which is bright and substantially colorless.
In accordance with one embodiment of the invention parts which have been electroplated with either cadmium or zinc are dipped for a short time in a bath comprising essentially a trivalent salt of chromium with a small percentage of nitrate in water.
In practicing the invention it has been found that zinc or cadmium parts, or parts which have been electroplated with either zinc or cadmium, may be given a lustrous substantially transparent surface which is relatively corrosion resistant if the parts are dipped in a water solution of trivalent chromium salt to which a nitrate has been added and held therein from to 20 seconds while the bath is maintained at a temperature of from 50 to 130 F.
The bath comprises a water solution of 1 ounce of chrome alum (KzCrz(SO'4)424I-IzO) for each gallon of water to which 5% nitric acid (HNOs) by volume is added.
Though more expensive, the bath may consist of 1 ounce of chromic sulphate in a gallon of water to which is added from'.1% to .75% by volume of nitric acid (HNOs).
The above described baths are particularly useful when incorporated in the final step of an electroplating process wherein parts are electroplated with either cadmium or zinc and after the last rinsing incident to the cadmium or zinc plating are dipped momentarily into the passivating bath. In these baths it is apparent that any trivalent salt of chromium when combined with a small amount of a nitrate and dissolved in water will produce a suitable finish. While admittedly this finish is not as corrosion resistant as those which involve the use vof hexavalent chromium, the bath, however, produces a bright transparent finish which has relatively good corrosion resistant qualities and a pleasing appearance. To obtain a lustrous, transparent surface, only one bath is necessary, making it readily adaptable to automatic platers. Of course, the passivating bath need not be used in connection with a plating process and may be used as a passivating solution on cadmium or zinc parts which are formed from solid metals, or the passivating may be effected on zinc or cadmium coated or plated parts at any time subsequent to the plating of the parts.
It should be noted, from a consideration of the two specific examples cited hereinbefore, that a water solution of trivalent chromium salts in the range of /2 to 1 ounce per gallon of water and to which nitric acid of 1.42 specific gravity has been added in an amount from .1% to 375% by volume of the solution provides a suitable passivating and brightening bath. Preferably, the nitric acid in such baths, as indicated in the first example, should comprise approximately .5% by volume of the bath.
It is to be understood that the above described arrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and all within the spirit and scope thereof.
What is claimed is:
1. The method of passivating zinc and cadmium surfaces of parts, which consists in dipping the parts in a water solution of chrome alum and nitric acid wherein approximately one ounce of chrome alum is used for each gallon of water and the nitric acid comprises approximately .5% by volume of the solution, holding the parts in said solution for from 5 to 20 seconds while maintaining the temperature of the solution at from 50 to F.
2. A water solution for forming a protective coating on zinc or cadmium surfaces, consisting of an acidified solution of chrome alum and nitric acid in water, wherein the chrome alum constitutes approximately 1 ounce for each gallon of water, and the nitric acid constitutes approximately .5% by volume of the bath.
3. A water solution for forming a protective coating on zinc or cadmium, consisting of chromic sulphate (CI2(SO4)318H2O) and nitric acid in water, wherein one ounce of chromic sulphate is used for each gallon of water and .5% by volume of nitric acid is added to the solution.
4. A water solution for forming a protective coating on zinc or cadmium, consisting of from to 1 ounce of chromic sulphate V (Crz (S04) 318H2O') in water to which there is added from 1% to .75% of nitric acid by volume.
5. The method of passivating zinc and cadmium surfaces of parts which consists in dipping the parts in a solution of a trivalent salt of chromium selected from the group consisting and holding the parts in the solution for from 5 to 20 seconds while maintaining the solution at from 50 F. to 130 F.
6. The method of passivating zinc and chromium surfaces of parts which consists in dipping the parts in a bath consisting of a water solution of chromic sulphate in nitric acid, wherein approximately one ounce of chromic sul phate is used for each gallon of water, and the nitric acid comprises from .l% to .75% by volume of the solution, holding the parts in said bath for from 5 to 20 seconds, and maintaining the bath temperature at from 50 F. to 130 F.
7. A solution for use as a passivation bath for zinc or cadmium surfaces consisting of a trivalent salt of chromium selected from the group 7 consisting of chrome alum and chromic sulphate,
and nitric acid in water wherein the salt of chromium constitutes approximately one ounce for each gallon of water and the nitric acid constitutes from .1% to by volume of the bath.
DONALD M. JOHNSON.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,250,508 Thompson et a1. July 29, 1941 2,276,353 Thompson Mar. 17, 1942 2,327,002 Thompson Aug. 17, 1943
Claims (1)
- 5. THE METHOD OF PASSIVATING ZINC AND CADMIUM SURFACES OF PARTS WHICH CONSISTS IN DIPPING THE PARTS IN A SOLUTION OF A TRIVALENT SALT OF CHROMIUM SELECTED FROM THE GROUP CONSISTING OF CHROME ALUM AND CHROMIC SULPHATE, AND NITRIC ACID IN WATER, WHEREIN THE SALT OF CHROMIUM CONSTITUTES APPROXIMATELY ONE OUNCE FOR EACH GALLON OF WATER, AND THE NITRIC ACID CONSTITUTES FROM .1% TO .75% BY VOLUME OF THE SOLUTION, AND HOLDING THE PARTS IN THE SOLUTION FOR FROM 5 TO 20 SECONDS WHILE MAINTAINING THE SOLUTION AT FROM 50* F. TO 130* F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US68069A US2559878A (en) | 1948-12-29 | 1948-12-29 | Zinc and cadmium passivating bath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US68069A US2559878A (en) | 1948-12-29 | 1948-12-29 | Zinc and cadmium passivating bath |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2559878A true US2559878A (en) | 1951-07-10 |
Family
ID=22080225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US68069A Expired - Lifetime US2559878A (en) | 1948-12-29 | 1948-12-29 | Zinc and cadmium passivating bath |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2559878A (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2709847A (en) * | 1951-05-04 | 1955-06-07 | Bendix Aviat Corp | Cadmium plated aluminum and the method of making the same |
| US2771669A (en) * | 1952-07-07 | 1956-11-27 | Gen Motors Corp | Method of coating interior of tubing with zinc |
| US2793932A (en) * | 1953-11-09 | 1957-05-28 | W H & L D Betz | Corrosion inhibiting |
| US2904414A (en) * | 1954-08-04 | 1959-09-15 | Allied Res Products Inc | Formulation for producing a protective bright chemically polished surface on zinc and cadmium |
| US3039900A (en) * | 1959-04-01 | 1962-06-19 | Cornigliano Societa Per Azioni | Method to form a film for protection against corrosion on sheets of galvanized steel |
| US3298876A (en) * | 1963-09-09 | 1967-01-17 | R O Hull & Company Inc | Process and composition for forming clear protective coatings on cadmium metal surfaces |
| FR2412622A1 (en) * | 1977-12-23 | 1979-07-20 | Rheinisches Zinkwalzwerk Gmbh | SURFACE TREATMENT PROCESS OF BODIES SHAPED IN ZINC OR A ZINC ALLOY AND PRODUCTS OBTAINED BY THIS PROCESS |
| US4171231A (en) * | 1978-04-27 | 1979-10-16 | R. O. Hull & Company, Inc. | Coating solutions of trivalent chromium for coating zinc surfaces |
| DE3213384A1 (en) * | 1981-04-16 | 1982-12-09 | Hooker Chemicals & Plastics Corp., 48089 Warren, Mich. | AQUEOUS ACID SOLUTION AND METHOD FOR THE TREATMENT OF RECEIVABLE METAL SUBSTRATES FOR THE AWARD OF A PASSIVATION FILM |
| US5415702A (en) * | 1993-09-02 | 1995-05-16 | Mcgean-Rohco, Inc. | Black chromium-containing conversion coatings on zinc-nickel and zinc-iron alloys |
| DE19615664A1 (en) * | 1996-04-19 | 1997-10-23 | Surtec Produkte Und Systeme Fu | Chromium (VI) free chromate layer and process for its production |
| US5707505A (en) * | 1988-09-29 | 1998-01-13 | Gesellschaft fur Technische Studien Entwicklung Planung mbH | Method for the electrophoretic dip coating of chromatizable metal surfaces |
| US20070119715A1 (en) * | 2005-11-25 | 2007-05-31 | Sacks Abraham J | Corrosion Resistant Wire Products and Method of Making Same |
| US7314671B1 (en) | 1996-04-19 | 2008-01-01 | Surtec International Gmbh | Chromium(VI)-free conversion layer and method for producing it |
| US20110070429A1 (en) * | 2009-09-18 | 2011-03-24 | Thomas H. Rochester | Corrosion-resistant coating for active metals |
| EP3569734A1 (en) | 2018-05-18 | 2019-11-20 | Henkel AG & Co. KGaA | Passivation composition based on trivalent chromium |
| EP3663435A1 (en) | 2018-12-05 | 2020-06-10 | Henkel AG & Co. KGaA | Passivation composition based on mixtures of phosphoric and phosphonic acids |
| WO2021139955A1 (en) | 2020-01-06 | 2021-07-15 | Henkel Ag & Co. Kgaa | Passivation composition suitable for inner surfaces of zinc coated steel tanks storing hydrocarbons |
| WO2022148536A1 (en) | 2021-01-06 | 2022-07-14 | Henkel Ag & Co. Kgaa | Improved cr(iii)-based passivation for zinc-aluminum coated steel |
| WO2022161806A1 (en) | 2021-02-01 | 2022-08-04 | Henkel Ag & Co. Kgaa | Improved cr(iii) based dry-in-place coating composition for zinc coated steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2250508A (en) * | 1936-06-15 | 1941-07-29 | John S Thompson | Treating zinc with organic acids |
| US2276353A (en) * | 1935-09-28 | 1942-03-17 | Parker Rust Proof Co | Process of coating |
| US2327002A (en) * | 1939-03-09 | 1943-08-17 | Parker Rust Proof Co | Coated article and method of making the same |
-
1948
- 1948-12-29 US US68069A patent/US2559878A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2276353A (en) * | 1935-09-28 | 1942-03-17 | Parker Rust Proof Co | Process of coating |
| US2250508A (en) * | 1936-06-15 | 1941-07-29 | John S Thompson | Treating zinc with organic acids |
| US2327002A (en) * | 1939-03-09 | 1943-08-17 | Parker Rust Proof Co | Coated article and method of making the same |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2709847A (en) * | 1951-05-04 | 1955-06-07 | Bendix Aviat Corp | Cadmium plated aluminum and the method of making the same |
| US2771669A (en) * | 1952-07-07 | 1956-11-27 | Gen Motors Corp | Method of coating interior of tubing with zinc |
| US2793932A (en) * | 1953-11-09 | 1957-05-28 | W H & L D Betz | Corrosion inhibiting |
| US2904414A (en) * | 1954-08-04 | 1959-09-15 | Allied Res Products Inc | Formulation for producing a protective bright chemically polished surface on zinc and cadmium |
| US3039900A (en) * | 1959-04-01 | 1962-06-19 | Cornigliano Societa Per Azioni | Method to form a film for protection against corrosion on sheets of galvanized steel |
| US3298876A (en) * | 1963-09-09 | 1967-01-17 | R O Hull & Company Inc | Process and composition for forming clear protective coatings on cadmium metal surfaces |
| FR2412622A1 (en) * | 1977-12-23 | 1979-07-20 | Rheinisches Zinkwalzwerk Gmbh | SURFACE TREATMENT PROCESS OF BODIES SHAPED IN ZINC OR A ZINC ALLOY AND PRODUCTS OBTAINED BY THIS PROCESS |
| US4171231A (en) * | 1978-04-27 | 1979-10-16 | R. O. Hull & Company, Inc. | Coating solutions of trivalent chromium for coating zinc surfaces |
| DE3213384A1 (en) * | 1981-04-16 | 1982-12-09 | Hooker Chemicals & Plastics Corp., 48089 Warren, Mich. | AQUEOUS ACID SOLUTION AND METHOD FOR THE TREATMENT OF RECEIVABLE METAL SUBSTRATES FOR THE AWARD OF A PASSIVATION FILM |
| US5707505A (en) * | 1988-09-29 | 1998-01-13 | Gesellschaft fur Technische Studien Entwicklung Planung mbH | Method for the electrophoretic dip coating of chromatizable metal surfaces |
| US5415702A (en) * | 1993-09-02 | 1995-05-16 | Mcgean-Rohco, Inc. | Black chromium-containing conversion coatings on zinc-nickel and zinc-iron alloys |
| US6287704B1 (en) | 1996-04-19 | 2001-09-11 | Surtec Produkte Und System Fur Die Oberflachenbehandlung Gmbh | Chromate-free conversion layer and process for producing the same |
| DE19615664A1 (en) * | 1996-04-19 | 1997-10-23 | Surtec Produkte Und Systeme Fu | Chromium (VI) free chromate layer and process for its production |
| US6946201B2 (en) | 1996-04-19 | 2005-09-20 | Surtec International Gmbh | Chromium (VI)-free conversion layer and method for producing it |
| US7314671B1 (en) | 1996-04-19 | 2008-01-01 | Surtec International Gmbh | Chromium(VI)-free conversion layer and method for producing it |
| US20070119715A1 (en) * | 2005-11-25 | 2007-05-31 | Sacks Abraham J | Corrosion Resistant Wire Products and Method of Making Same |
| US20110070429A1 (en) * | 2009-09-18 | 2011-03-24 | Thomas H. Rochester | Corrosion-resistant coating for active metals |
| EP3569734A1 (en) | 2018-05-18 | 2019-11-20 | Henkel AG & Co. KGaA | Passivation composition based on trivalent chromium |
| WO2019219403A1 (en) | 2018-05-18 | 2019-11-21 | Henkel Ag & Co. Kgaa | Passivation composition based on trivalent chromium |
| EP3663435A1 (en) | 2018-12-05 | 2020-06-10 | Henkel AG & Co. KGaA | Passivation composition based on mixtures of phosphoric and phosphonic acids |
| WO2020114727A1 (en) | 2018-12-05 | 2020-06-11 | Henkel Ag & Co. Kgaa | Passivation composition based on mixtures of phosphoric and phosphonic acids |
| WO2021139955A1 (en) | 2020-01-06 | 2021-07-15 | Henkel Ag & Co. Kgaa | Passivation composition suitable for inner surfaces of zinc coated steel tanks storing hydrocarbons |
| WO2022148536A1 (en) | 2021-01-06 | 2022-07-14 | Henkel Ag & Co. Kgaa | Improved cr(iii)-based passivation for zinc-aluminum coated steel |
| WO2022161806A1 (en) | 2021-02-01 | 2022-08-04 | Henkel Ag & Co. Kgaa | Improved cr(iii) based dry-in-place coating composition for zinc coated steel |
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