US1845978A - Process for the electrolytic production of alpha particularly strong chromium coating - Google Patents
Process for the electrolytic production of alpha particularly strong chromium coating Download PDFInfo
- Publication number
- US1845978A US1845978A US259923A US25992328A US1845978A US 1845978 A US1845978 A US 1845978A US 259923 A US259923 A US 259923A US 25992328 A US25992328 A US 25992328A US 1845978 A US1845978 A US 1845978A
- Authority
- US
- United States
- Prior art keywords
- chromium
- coating
- electrolysis
- particularly strong
- chromium coating
- 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
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title description 31
- 229910052804 chromium Inorganic materials 0.000 title description 31
- 239000011651 chromium Substances 0.000 title description 31
- 238000000576 coating method Methods 0.000 title description 29
- 239000011248 coating agent Substances 0.000 title description 27
- 238000000034 method Methods 0.000 title description 14
- 238000004519 manufacturing process Methods 0.000 title description 9
- 238000005868 electrolysis reaction Methods 0.000 description 23
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 8
- 229910052796 boron Inorganic materials 0.000 description 8
- 238000000151 deposition Methods 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 2
- GDTSJMKGXGJFGQ-UHFFFAOYSA-N 3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound O1B([O-])OB2OB([O-])OB1O2 GDTSJMKGXGJFGQ-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- NVIFVTYDZMXWGX-UHFFFAOYSA-N sodium metaborate Chemical compound [Na+].[O-]B=O NVIFVTYDZMXWGX-UHFFFAOYSA-N 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- -1 sulphate ions Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
Definitions
- This invention relates to a process for the electrolytic production of a particularly strong chromium coating.
- a chromium coating is oh- 5 tained by roducing first by aqueous electrolysis a c romium coating on the body to be coated, whereupon chromium is deposited upon the said coating b the electrolysis of a chromium-containing fused bath.
- Aselectrolyte for the aqueous electrolysis is preferably used an aqueous solution of chromic acid containing a small quantity of sulphate ions.
- the new process gives a particularly high hardness of the superficial layers of the coated articles or objects and at the same time an increased resistance to corrosion.
- the obtention of the high hardness is probably due to the fact that at the high temperature of the fused bath electrolysis, there takes place a cementation of the chromium layer previously produced by the aqueous electrolysis, with the metal situated under it.
- the quality of the coating obtained by the new process can be still further improved by depositing during the fused bath electrolysis, in addition to chromium and at the same time also one or more improving metals, for instance boron or silicon. This can be done by electrolyzing with sufficient densities of current a fused bath which contains boron or silicon, or a fused bath which contains both substances and in which chromium is dissolved for instance in the form of oxide.
- the new process gives chromium coatings which, as regards their. characteristic properties, are superior to the chromium coatings prepared by any one of the hitherto known processes, as well as to those which are produced by fused bath electrolysis alone. Accordingly, the objects coated by the new process are particularly suitable for use where they have to comply with extraordinarily severe conditions.
- the two layers of coating i. e., the first layer deposited by aqueous bath electrolysis and the second layer deposited by fused bath t0 electrolysis, may be applied by known meth-' ods.
- the bath disclosed in the literature by Sargent may be employed and for.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Description
Patented Feb. 16, 1932 UNITED STATES PATENT OFFICE MARTIN EOSENFELD, F BERLIN-SIEMEN'SSTADT, GERMANY, ASSIGNOR TO METAL & THERMIT CORPORATION, OF NEW YORK, N. Y.
PROCESS FOR THE ELECTROLYTIC PRODUCTION OF A PARTICULARLY STRONG- CHIRO- MIUM COATING 1T0 Drawing. Application filed March 7, 1928, Serial No. 259,923, and in Germany March 18, 1927.
This invention relates to a process for the electrolytic production of a particularly strong chromium coating. According to the invention, such a chromium coating is oh- 5 tained by roducing first by aqueous electrolysis a c romium coating on the body to be coated, whereupon chromium is deposited upon the said coating b the electrolysis of a chromium-containing fused bath. Aselectrolyte for the aqueous electrolysis is preferably used an aqueous solution of chromic acid containing a small quantity of sulphate ions.
As shown by experiments, the new process gives a particularly high hardness of the superficial layers of the coated articles or objects and at the same time an increased resistance to corrosion. The obtention of the high hardness is probably due to the fact that at the high temperature of the fused bath electrolysis, there takes place a cementation of the chromium layer previously produced by the aqueous electrolysis, with the metal situated under it. If desired, the quality of the coating obtained by the new process, can be still further improved by depositing during the fused bath electrolysis, in addition to chromium and at the same time also one or more improving metals, for instance boron or silicon. This can be done by electrolyzing with sufficient densities of current a fused bath which contains boron or silicon, or a fused bath which contains both substances and in which chromium is dissolved for instance in the form of oxide.
As shown by experiments, the new process gives chromium coatings which, as regards their. characteristic properties, are superior to the chromium coatings prepared by any one of the hitherto known processes, as well as to those which are produced by fused bath electrolysis alone. Accordingly, the objects coated by the new process are particularly suitable for use where they have to comply with extraordinarily severe conditions.
The two layers of coating, i. e., the first layer deposited by aqueous bath electrolysis and the second layer deposited by fused bath t0 electrolysis, may be applied by known meth-' ods. For example for the aqueous electrolysis coating the bath disclosed in the literature by Sargent may be employed and for.
ture of 1100 C., a tension of volts and a current density of 2000 amp. /m. If boron is to be deposited with the chromium, a hath made by dissolving by weight of chromium oxide in molten sodium 'tetraborate (borax) and the electrolysis carried out at 900 C. with a tension of 8 volts and a current density of 4000 amp/111. may be used. If silicon is to be deposited with the chromium instead of boron, sodium meta-silicate is substituted for sodium metaborate in the bath described. For the deposition of both silicon and boron the two baths above described are judiciouslycombined.
What I claim as my invention and desire to be secured by Letters Patent is:
1. In a process for the production of a particularly strong chromium coating, the combination of first producing a chromium coating by aqueous electrolysis on the object to be coated, and then depositing chromium upon said coating by electrolysis of a chromium containing molten bath.
2. 'In a process for the production of a particularly strong chromium coating, the combination of first producing a chromium coating by aqueous electrolysis on the object to be coated, and thendepositing chromium together with an improving metalupon said coating by electrolysis of a fused bath containing the same.
3. In a process for the production of a particularly strong chromium coating, the
combination of first producing a chromium coating by aqueous electrolysis on the object to be coated, and then depositing chromium together with at least one metal of the class consisting of boron and silicon upon said coating by electrolysis of a fused bath containing the same.
4. In a process for the production of a particularly strong chromium coating, the combination of first producing a chromium coating by aqueous electrolysis on. the object to be coated, and then depositing chromium together with boron upon said coating by electrolysis of a fused bath containing the same. v a
5. In a process for the production of a particularly'strong chromium coating, the combination of first producing a chromium coating by aqueous electrolysis on the object to be coated, and then depositing chromium together with silicon upon said coating by electrolysis of a fused bath containing the same.
6. In a process for the production of a particularly strong chromium coating, the combination of first producing a chromium coating by aqueous electrolysis on the object to be coated, and then depositing chromium together with boron and silicon upon said coating by electrolysis of a fused bath containing the same. 1
In testimony whereof I afiix my signature.
MARTIN HOSENFELD.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1845978X | 1927-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1845978A true US1845978A (en) | 1932-02-16 |
Family
ID=7745775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US259923A Expired - Lifetime US1845978A (en) | 1927-03-18 | 1928-03-07 | Process for the electrolytic production of alpha particularly strong chromium coating |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1845978A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2542994A (en) * | 1945-07-09 | 1951-02-27 | Armco Steel Corp | Electrolytic surface treatment of steel |
| US2786809A (en) * | 1953-09-30 | 1957-03-26 | Horizons Titanium Corp | Electrolytic cladding |
| US2828251A (en) * | 1953-09-30 | 1958-03-25 | Horizons Titanium Corp | Electrolytic cladding process |
| US3024177A (en) * | 1959-08-04 | 1962-03-06 | Gen Electric | Corrosion resistant coating |
| US3232853A (en) * | 1962-03-05 | 1966-02-01 | Gen Electric | Corrosion resistant chromide coating |
| USH543H (en) | 1986-10-10 | 1988-11-01 | The United States Of America As Represented By The Secretary Of The Army | Laminated chromium composite |
-
1928
- 1928-03-07 US US259923A patent/US1845978A/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2542994A (en) * | 1945-07-09 | 1951-02-27 | Armco Steel Corp | Electrolytic surface treatment of steel |
| US2786809A (en) * | 1953-09-30 | 1957-03-26 | Horizons Titanium Corp | Electrolytic cladding |
| US2828251A (en) * | 1953-09-30 | 1958-03-25 | Horizons Titanium Corp | Electrolytic cladding process |
| US3024177A (en) * | 1959-08-04 | 1962-03-06 | Gen Electric | Corrosion resistant coating |
| US3232853A (en) * | 1962-03-05 | 1966-02-01 | Gen Electric | Corrosion resistant chromide coating |
| USH543H (en) | 1986-10-10 | 1988-11-01 | The United States Of America As Represented By The Secretary Of The Army | Laminated chromium composite |
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