US2650902A - Electrodeposition on magnesium and magnesium-base alloys - Google Patents
Electrodeposition on magnesium and magnesium-base alloys Download PDFInfo
- Publication number
- US2650902A US2650902A US97481A US9748149A US2650902A US 2650902 A US2650902 A US 2650902A US 97481 A US97481 A US 97481A US 9748149 A US9748149 A US 9748149A US 2650902 A US2650902 A US 2650902A
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- United States
- Prior art keywords
- magnesium
- solution
- zinc
- silver
- base alloys
- 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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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims description 19
- 229910052749 magnesium Inorganic materials 0.000 title claims description 17
- 239000011777 magnesium Substances 0.000 title claims description 17
- 229910045601 alloy Inorganic materials 0.000 title claims description 5
- 239000000956 alloy Substances 0.000 title claims description 5
- 238000004070 electrodeposition Methods 0.000 title description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical class [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 17
- 229910052725 zinc Inorganic materials 0.000 claims description 17
- 239000011701 zinc Substances 0.000 claims description 17
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Chemical compound O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 229910052793 cadmium Inorganic materials 0.000 claims description 8
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical class [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 8
- 238000009713 electroplating Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical class [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 7
- 229910052748 manganese Chemical class 0.000 claims description 7
- 239000011572 manganese Chemical class 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 29
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 8
- 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 8
- 229910052709 silver Inorganic materials 0.000 description 8
- 239000004332 silver Substances 0.000 description 8
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000007747 plating Methods 0.000 description 5
- LFAGQMCIGQNPJG-UHFFFAOYSA-N silver cyanide Chemical compound [Ag+].N#[C-] LFAGQMCIGQNPJG-UHFFFAOYSA-N 0.000 description 5
- 229940098221 silver cyanide Drugs 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 239000011592 zinc chloride Substances 0.000 description 4
- 235000005074 zinc chloride Nutrition 0.000 description 4
- ZELCNSAUMHNSSU-UHFFFAOYSA-N 3,5-diamino-2-[(4-sulfamoylphenyl)diazenyl]benzoic acid Chemical compound OC(=O)C1=CC(N)=CC(N)=C1N=NC1=CC=C(S(N)(=O)=O)C=C1 ZELCNSAUMHNSSU-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- -1 chromic acid ions Chemical class 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- DRXYRSRECMWYAV-UHFFFAOYSA-N mercury(I) nitrate Inorganic materials [Hg+].[O-][N+]([O-])=O DRXYRSRECMWYAV-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 2
- 239000011686 zinc sulphate Substances 0.000 description 2
- 235000009529 zinc sulphate Nutrition 0.000 description 2
- 229910000497 Amalgam Inorganic materials 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000005267 amalgamation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- QCUOBSQYDGUHHT-UHFFFAOYSA-L cadmium sulfate Chemical compound [Cd+2].[O-]S([O-])(=O)=O QCUOBSQYDGUHHT-UHFFFAOYSA-L 0.000 description 1
- 229910000369 cadmium(II) sulfate Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000002697 manganese compounds Chemical class 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
Definitions
- magnesium or magnesium alloy is immersed in a solution of a zinc, cadmium or manganese compound which is decomposed by the magnesium to produce a coating of metallic zinc, cadmium or manganese on the magnesium metal, whereafter the magnesium metal is treated electrolytically in a solution adapted to produce an electrodeposited film of another metal on the said coating.
- a zinc, cadmium or manganese compound which is decomposed by the magnesium to produce a coating of metallic zinc, cadmium or manganese on the magnesium metal, whereafter the magnesium metal is treated electrolytically in a solution adapted to produce an electrodeposited film of another metal on the said coating.
- Such metals may include silver, nickel, cadmium, chromium, copper, brass, cobalt, rhodium, gold and platinum; a further coating of zinc, cadmium or manganese may also be deposited, in general but not necessarily on a substratum of zinc.
- the film of metal may in particular be silver but other films may be provided, as stated above.
- any simple salt of zinc, manganese, or cadmium may be used or mixtures.
- the solutions are free from chromic acid ions or intentional additions of any other acids or alkalis.
- a 5 to e. g., 10% solution of the salt in water is satisfactory and a temperature of -30 C. is suitable.
- the deposit so produced consists partly of a firmly adherent metallic film and partly of a loose voluminous film. This latter should be washed off with water and the process repeated until the firmly adherent film has become thick enough for subsequent operations to be described below.
- the metallic film so produced may be boiled in a 10% solution of chromic acid which has the effect of consolidating the zinc and rendering it uniform. At the same time, it produces a passive condition in which state it is not suitable for electro-plating. After rinsing therefore, the zinc film is immersed in a solution of nitrate or cyanide of mercury which brings about amalgamation or the formation of mercury amalgam on the surface and renders this latter fit for electroplating. In this condition, the surface is suitable for electro-plating by any of the usual plating baths.
- the silver cyanide bath will give a satisfactory coating of silver, but other baths may also be used.
- a silver cyanide bath satisfactory results are obtained if the zinc covered sample is immersed for about an hour at room temperature in a solution containing 13.7 gms. of silver in the form of any soluble salt (preferably in the form of silver cyanide), 26.7 gms. of potassium cyanide and gms. of potassium carbonate per litre, and plated ata current density of 3 amps. per sq. ft. using a silver anode.
- any simple zinc salt may be used to produce the initial metallic film.
- a piece of Elektron AZ91 (composition aluminium 9.5%, zinc 0.4%, manganese 0.3%, balance magnesium), suitably cleaned, was immersed in a 10% solution of MnSO4.4I-I2O for 1 seconds, with agitation. It was then rinsed and dipped in boiling 10% chromic acid solution for 15 seconds. After swilling in water, it was quickly dipped in a 1% solution of mercurous nitrate and then plated for 1 hour at a current density of 3 amps/sq. ft. in an alkaline silver cyanide plating bath. The plated surface was finally buffed on a polishing mop.
- a piece of Elektron A8 (composition aluminium 8%, zinc 0.4%, manganese 0.3%, balance magnesium), after cleaning, was immersed in a 10% solution of CdSO4 for 10 seconds. It was then swilled and dipped in boiling 10% chromic acid solution for 10 seconds. After swilling, it was quickly dipped in a 1% solution of mercurous nitrate and then plated for 1 hour at a current density of 3 amps/sq. ft. in the alkaline silver cyanide plating bath. The plated surface was finally buffed on a polishing mop.
- a piece of Elektron AM503 (composition manganese 1.5%, balance magnesium) sheet was immersed in a 10% solution of zinc chloride for a few seconds. It was then rinsed and immersed in 10% boiling chromic acid solution for a few seconds. After rinsing, it was returned to the zinc chloride solution, rinsed, again immersed in the chromic acid solution and this process repeated five times. After a final rinse, it was transferred to the alkaline silver plating solution where it was plated for 1% hours at 3 amps/sq. ft. An excellent deposit of silver, uniformly deposited, was produced by this means and this withstood the subsequent bufiing operations perfectly.
- a process for the treatment of magnesium and magnesium base alloys which consists in immersing the magnesium-containing article in a first solution oi? a compound selected from the group consisting of the salts of zinc, cadmium, and manganese which are soluble in water and are decomposed by the magnesium to produce a metallic coating of one of these metals on the article, contacting the coated article with an aqueous chromic acid solution which leaves the surface of the metallic coating in a passive condition, and then contacting the coated article with a solution of at least one of the salts of the group consisting of a cyanide of mercury and a nitrate of mercury which leaves the surface of the metallic coating in a condition suitable for electroplating, and thereafter electroplating the coated article.
- said first solution is a 5-10% solution of the salt and is free from chromic acid ions and free from any 4 acids and alkalis and wherein the temperature of said first solution is 20 to 30 C.
- a process as claimed in claim 1 wherein, after the metal is immersed in the first salt solution, it is then washed with water and contacted with the chromic acid solution, and these three steps then repeated at least once before the electroplating step.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Patented Sept. 1, 1953 ELECTRODEPOSITION ON MAGNESIUM AND MAGNESIUM-BASE ALLOYS William F. Higgins, Salford, England, assignor to Magnesium-Elektron Limited, Clifton Junction, England No Drawing. Application June 6, 1949, Serial No. 97,481. In Great Britain June 10, 1948 Claims. (Cl. 204-38) This invention relates to the provision on magnesium and magnesium base alloys of metallic coatings by electrodeposition.
According to the present invention magnesium or magnesium alloy is immersed in a solution of a zinc, cadmium or manganese compound which is decomposed by the magnesium to produce a coating of metallic zinc, cadmium or manganese on the magnesium metal, whereafter the magnesium metal is treated electrolytically in a solution adapted to produce an electrodeposited film of another metal on the said coating. Such metals may include silver, nickel, cadmium, chromium, copper, brass, cobalt, rhodium, gold and platinum; a further coating of zinc, cadmium or manganese may also be deposited, in general but not necessarily on a substratum of zinc.
The film of metal may in particular be silver but other films may be provided, as stated above.
One process in accordance with the invention,
referred to by way of example, consists in cleaning the metal, and dipping it in an aqueous solution of zinc chloride. A fairly vigorous reaction ensues which results in the deposition of a black film of finel divided zinc.
Instead of using zinc chloride any simple salt of zinc, manganese, or cadmium may be used or mixtures. The solutions are free from chromic acid ions or intentional additions of any other acids or alkalis. A 5 to e. g., 10% solution of the salt in water is satisfactory and a temperature of -30 C. is suitable.
The deposit so produced consists partly of a firmly adherent metallic film and partly of a loose voluminous film. This latter should be washed off with water and the process repeated until the firmly adherent film has become thick enough for subsequent operations to be described below.
The metallic film so produced may be boiled in a 10% solution of chromic acid which has the effect of consolidating the zinc and rendering it uniform. At the same time, it produces a passive condition in which state it is not suitable for electro-plating. After rinsing therefore, the zinc film is immersed in a solution of nitrate or cyanide of mercury which brings about amalgamation or the formation of mercury amalgam on the surface and renders this latter fit for electroplating. In this condition, the surface is suitable for electro-plating by any of the usual plating baths.
The silver cyanide bath will give a satisfactory coating of silver, but other baths may also be used. When using a silver cyanide bath, satisfactory results are obtained if the zinc covered sample is immersed for about an hour at room temperature in a solution containing 13.7 gms. of silver in the form of any soluble salt (preferably in the form of silver cyanide), 26.7 gms. of potassium cyanide and gms. of potassium carbonate per litre, and plated ata current density of 3 amps. per sq. ft. using a silver anode.
Instead of using chloride, any simple zinc salt may be used to produce the initial metallic film.
Several methods of treatment will now be described by way of example:
1. A piece of Elektron AZ91 (composition aluminium 9.5%, zinc 0.4%, manganese 0.3%, balance magnesium), suitably cleaned, was immersed in a 10% solution of MnSO4.4I-I2O for 1 seconds, with agitation. It was then rinsed and dipped in boiling 10% chromic acid solution for 15 seconds. After swilling in water, it was quickly dipped in a 1% solution of mercurous nitrate and then plated for 1 hour at a current density of 3 amps/sq. ft. in an alkaline silver cyanide plating bath. The plated surface was finally buffed on a polishing mop.
2. A piece of Elektron A8 (composition aluminium 8%, zinc 0.4%, manganese 0.3%, balance magnesium), after cleaning, was immersed in a 10% solution of CdSO4 for 10 seconds. It was then swilled and dipped in boiling 10% chromic acid solution for 10 seconds. After swilling, it was quickly dipped in a 1% solution of mercurous nitrate and then plated for 1 hour at a current density of 3 amps/sq. ft. in the alkaline silver cyanide plating bath. The plated surface was finally buffed on a polishing mop.
3. A piece of Elektron AM503 (composition manganese 1.5%, balance magnesium) sheet was immersed in a 10% solution of zinc chloride for a few seconds. It was then rinsed and immersed in 10% boiling chromic acid solution for a few seconds. After rinsing, it was returned to the zinc chloride solution, rinsed, again immersed in the chromic acid solution and this process repeated five times. After a final rinse, it was transferred to the alkaline silver plating solution where it was plated for 1% hours at 3 amps/sq. ft. An excellent deposit of silver, uniformly deposited, was produced by this means and this withstood the subsequent bufiing operations perfectly.
4. The experiment described in No. 3 above was repeated using a zinc sulphate solution of 5% strength. The results obtained were similar, though rather longer periods of immersion in the zinc solution were required to secure an adequate zinc deposit. By repeating the clipping procedure,
it was possible to observe and follow the progressive accumulation of the necessary zinc film.
5. A piece of Elektron ZW 3 (composition zirconium 0.7%, zinc 3%, balance magnesium) was treated in a similar manner to No. 3 above, but using a 10% zinc sulphate solution. The results were not to be distinguished from those already described.
6. Similar results were obtained with nickel and cadmium plating baths.
I claim:
1. A process for the treatment of magnesium and magnesium base alloys which consists in immersing the magnesium-containing article in a first solution oi? a compound selected from the group consisting of the salts of zinc, cadmium, and manganese which are soluble in water and are decomposed by the magnesium to produce a metallic coating of one of these metals on the article, contacting the coated article with an aqueous chromic acid solution which leaves the surface of the metallic coating in a passive condition, and then contacting the coated article with a solution of at least one of the salts of the group consisting of a cyanide of mercury and a nitrate of mercury which leaves the surface of the metallic coating in a condition suitable for electroplating, and thereafter electroplating the coated article.
2. A process as claimed in claim 1 wherein said first solution is a 5-10% solution of the salt and is free from chromic acid ions and free from any 4 acids and alkalis and wherein the temperature of said first solution is 20 to 30 C.
3. A process as claimed in claim 1 wherein the chromic acid solution is boiling.
4. A process as claimed in claim 1 wherein, after the metal is immersed in the first salt solution, it is then washed with water and contacted with the chromic acid solution, and these three steps then repeated at least once before the electroplating step.
5. A process as claimed in claim 1 wherein the coated article is immersed in an electrolytic solution containing a silver salt, and a cyanide, and wherein the coated article is silver plated.
WILLIAM F. HIGGINS.
References Cited in the file of this patent UNITED STATES PATENTS Number Name- Date 1,627,900 Hewitson May 10, 1927 1,827,142 De Trairup Oct. 13, 1931 2,233,410 Frasch Mar. 4, 1941 2,526,544 De Long Oct. 17, 1950 FOREIGN PATENTS Number Country Date 506,466 Great Britain May 30, 1939 507,342 Great Britain June 14, 1939 OTHER REFERENCES "Metal Finishing, vol. 43 (1945), pages 48 and 49.
Claims (1)
1. A PROCESS FOR THE TREATMENT OF MAGNESIUM AND MAGNESIUM BASE ALLOYS WHICH CONSISTS IN IMMERSING THE MAGNESIUM-CONTAINING ARTICLE IN A FIRST SOLUTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE SALTS OF ZINC, CADMIUM, AND MANGANESE WHICH ARE SOLUBLE IN WATER AND ARE DECOMPOSED BY THE MAGNESIUM TO PRODUCE A METALLIC COATING OF ONE OF THESE METALS ON THE ARTICLE, CONTACTING THE COATED ARTICLE WITH AN AQUEOUS CHROMIC ACID SOLUTION WHICH LEAVES THE SURFACE OF THE METALLIC COATING IN A PASSIVE CONDITION, AND THEN CONTACTING THE COATED ARTICLE WITH A SOLUTION OF AT LEAST ONE OF THE SALTS OF THE GROUP CONSISTING OF A CYANIDE OF MERCURY AND A NITRATE OF MERCURY WHICH LEAVES THE SURFACE OF THE METALLIC COATING IN A CONDITION SUITABLE FOR ELECTROPLATING, AND THEREAFTER ELECTROPLATING THE COATED ARTICLE.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB15713/48A GB652800A (en) | 1948-06-10 | 1948-06-10 | Improvements in or relating to the provision on magnesium and magnesium base alloys of metallic coatings by electrodeposition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2650902A true US2650902A (en) | 1953-09-01 |
Family
ID=10064133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US97481A Expired - Lifetime US2650902A (en) | 1948-06-10 | 1949-06-06 | Electrodeposition on magnesium and magnesium-base alloys |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2650902A (en) |
| FR (1) | FR988161A (en) |
| GB (1) | GB652800A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2745799A (en) * | 1951-03-16 | 1956-05-15 | Pechiney Prod Chimiques Sa | Processes for coating aluminum and alloys thereof |
| US2796361A (en) * | 1953-04-15 | 1957-06-18 | Poor & Co | Method of making corrosion protected articles |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1627900A (en) * | 1926-08-23 | 1927-05-10 | Eastman Kodak Co | Process of coating aluminum surfaces |
| US1827142A (en) * | 1929-09-03 | 1931-10-13 | Trairup Martin Kristensen De | Process for the treatment of aluminum |
| GB507342A (en) * | 1937-12-15 | 1939-06-14 | Langbein Pfanhauser Werke Ag | Improvements in and relating to a method of electroplating articles of readily oxidizable metals |
| GB508466A (en) * | 1937-09-29 | 1939-06-29 | John Walker Chalmers | Improvements in or relating to the packing of cigarettes or other rod-shaped articles |
| US2233410A (en) * | 1936-07-02 | 1941-03-04 | Produits Chim Terres Rares Soc | Process for direct nickel-plating of aluminum and its alloys |
| US2526544A (en) * | 1947-10-06 | 1950-10-17 | Dow Chemical Co | Method of producing a metallic coating on magnesium and its alloys |
-
1948
- 1948-06-10 GB GB15713/48A patent/GB652800A/en not_active Expired
-
1949
- 1949-06-06 US US97481A patent/US2650902A/en not_active Expired - Lifetime
- 1949-06-10 FR FR988161D patent/FR988161A/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1627900A (en) * | 1926-08-23 | 1927-05-10 | Eastman Kodak Co | Process of coating aluminum surfaces |
| US1827142A (en) * | 1929-09-03 | 1931-10-13 | Trairup Martin Kristensen De | Process for the treatment of aluminum |
| US2233410A (en) * | 1936-07-02 | 1941-03-04 | Produits Chim Terres Rares Soc | Process for direct nickel-plating of aluminum and its alloys |
| GB508466A (en) * | 1937-09-29 | 1939-06-29 | John Walker Chalmers | Improvements in or relating to the packing of cigarettes or other rod-shaped articles |
| GB507342A (en) * | 1937-12-15 | 1939-06-14 | Langbein Pfanhauser Werke Ag | Improvements in and relating to a method of electroplating articles of readily oxidizable metals |
| US2526544A (en) * | 1947-10-06 | 1950-10-17 | Dow Chemical Co | Method of producing a metallic coating on magnesium and its alloys |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2745799A (en) * | 1951-03-16 | 1956-05-15 | Pechiney Prod Chimiques Sa | Processes for coating aluminum and alloys thereof |
| US2796361A (en) * | 1953-04-15 | 1957-06-18 | Poor & Co | Method of making corrosion protected articles |
Also Published As
| Publication number | Publication date |
|---|---|
| GB652800A (en) | 1951-05-02 |
| FR988161A (en) | 1951-08-23 |
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