US2250473A - Coating magnesium articles - Google Patents
Coating magnesium articles Download PDFInfo
- Publication number
- US2250473A US2250473A US336962A US33696240A US2250473A US 2250473 A US2250473 A US 2250473A US 336962 A US336962 A US 336962A US 33696240 A US33696240 A US 33696240A US 2250473 A US2250473 A US 2250473A
- Authority
- US
- United States
- Prior art keywords
- magnesium
- coating
- solution
- article
- temperature
- 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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- 238000000576 coating method Methods 0.000 title description 18
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title description 12
- 239000011248 coating agent Substances 0.000 title description 12
- 229910052749 magnesium Inorganic materials 0.000 title description 12
- 239000011777 magnesium Substances 0.000 title description 12
- 238000000034 method Methods 0.000 description 17
- 239000000975 dye Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 229910000861 Mg alloy Inorganic materials 0.000 description 7
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 230000001464 adherent effect Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 4
- 239000012670 alkaline solution Substances 0.000 description 4
- RGCKGOZRHPZPFP-UHFFFAOYSA-N alizarin Chemical compound C1=CC=C2C(=O)C3=C(O)C(O)=CC=C3C(=O)C2=C1 RGCKGOZRHPZPFP-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- JROURLWMOZCGJV-UHFFFAOYSA-N alizarin blue Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C1=CC=CN=C1C(O)=C2O JROURLWMOZCGJV-UHFFFAOYSA-N 0.000 description 2
- VQLYBLABXAHUDN-UHFFFAOYSA-N bis(4-fluorophenyl)-methyl-(1,2,4-triazol-1-ylmethyl)silane;methyl n-(1h-benzimidazol-2-yl)carbamate Chemical compound C1=CC=C2NC(NC(=O)OC)=NC2=C1.C=1C=C(F)C=CC=1[Si](C=1C=CC(F)=CC=1)(C)CN1C=NC=N1 VQLYBLABXAHUDN-UHFFFAOYSA-N 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- ZXJXZNDDNMQXFV-UHFFFAOYSA-M crystal violet Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1[C+](C=1C=CC(=CC=1)N(C)C)C1=CC=C(N(C)C)C=C1 ZXJXZNDDNMQXFV-UHFFFAOYSA-M 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Inorganic materials [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 2
- SMUQFGGVLNAIOZ-UHFFFAOYSA-N quinaldine Chemical compound C1=CC=CC2=NC(C)=CC=C21 SMUQFGGVLNAIOZ-UHFFFAOYSA-N 0.000 description 2
- FKVXIGHJGBQFIH-UHFFFAOYSA-K trisodium 5-amino-3-[[4-[4-[(7-amino-1-hydroxy-3-sulfonatonaphthalen-2-yl)diazenyl]phenyl]phenyl]diazenyl]-4-hydroxynaphthalene-2,7-disulfonate Chemical compound C1=CC(=CC=C1C2=CC=C(C=C2)N=NC3=C(C=C4C=CC(=CC4=C3[O-])N)S(=O)(=O)O)N=NC5=C(C6=C(C=C(C=C6C=C5S(=O)(=O)O)S(=O)(=O)[O-])N)[O-].[Na+].[Na+].[Na+] FKVXIGHJGBQFIH-UHFFFAOYSA-K 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- USPMMJODHSTVIM-UHFFFAOYSA-N 2,3-dimethyl-6-phenyldiazenylaniline Chemical compound NC1=C(C)C(C)=CC=C1N=NC1=CC=CC=C1 USPMMJODHSTVIM-UHFFFAOYSA-N 0.000 description 1
- FFRBMBIXVSCUFS-UHFFFAOYSA-N 2,4-dinitro-1-naphthol Chemical compound C1=CC=C2C(O)=C([N+]([O-])=O)C=C([N+]([O-])=O)C2=C1 FFRBMBIXVSCUFS-UHFFFAOYSA-N 0.000 description 1
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 1
- HKJKONMZMPUGHJ-UHFFFAOYSA-N 4-amino-5-hydroxy-3-[(4-nitrophenyl)diazenyl]-6-phenyldiazenylnaphthalene-2,7-disulfonic acid Chemical compound OS(=O)(=O)C1=CC2=CC(S(O)(=O)=O)=C(N=NC=3C=CC=CC=3)C(O)=C2C(N)=C1N=NC1=CC=C([N+]([O-])=O)C=C1 HKJKONMZMPUGHJ-UHFFFAOYSA-N 0.000 description 1
- MPVDXIMFBOLMNW-ISLYRVAYSA-N 7-hydroxy-8-[(E)-phenyldiazenyl]naphthalene-1,3-disulfonic acid Chemical compound OC1=CC=C2C=C(S(O)(=O)=O)C=C(S(O)(=O)=O)C2=C1\N=N\C1=CC=CC=C1 MPVDXIMFBOLMNW-ISLYRVAYSA-N 0.000 description 1
- FYEHYMARPSSOBO-UHFFFAOYSA-N Aurin Chemical compound C1=CC(O)=CC=C1C(C=1C=CC(O)=CC=1)=C1C=CC(=O)C=C1 FYEHYMARPSSOBO-UHFFFAOYSA-N 0.000 description 1
- VVAVKBBTPWYADW-UHFFFAOYSA-L Biebrich scarlet Chemical compound [Na+].[Na+].OC1=CC=C2C=CC=CC2=C1N=NC(C(=C1)S([O-])(=O)=O)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 VVAVKBBTPWYADW-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 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
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- DGOBMKYRQHEFGQ-UHFFFAOYSA-L acid green 5 Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C=CC(=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 DGOBMKYRQHEFGQ-UHFFFAOYSA-L 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 235000012730 carminic acid Nutrition 0.000 description 1
- 239000004106 carminic acid Substances 0.000 description 1
- XBLIFEQTVVSTIM-UHFFFAOYSA-L chembl2105392 Chemical compound [Na+].[Na+].[O-]S(=O)(=O)C1=CC2=CC(S([O-])(=O)=O)=CC=C2C(O)=C1N=NC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O XBLIFEQTVVSTIM-UHFFFAOYSA-L 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229940080423 cochineal Drugs 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- OOYIOIOOWUGAHD-UHFFFAOYSA-L disodium;2',4',5',7'-tetrabromo-4,5,6,7-tetrachloro-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate Chemical compound [Na+].[Na+].O1C(=O)C(C(=C(Cl)C(Cl)=C2Cl)Cl)=C2C21C1=CC(Br)=C([O-])C(Br)=C1OC1=C(Br)C([O-])=C(Br)C=C21 OOYIOIOOWUGAHD-UHFFFAOYSA-L 0.000 description 1
- SEACYXSIPDVVMV-UHFFFAOYSA-L eosin Y Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=CC=C1C1=C2C=C(Br)C(=O)C(Br)=C2OC2=C(Br)C([O-])=C(Br)C=C21 SEACYXSIPDVVMV-UHFFFAOYSA-L 0.000 description 1
- JGIDSJGZGFYYNX-YUAHOQAQSA-N indian yellow Chemical compound O1[C@H](C(O)=O)[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1OC1=CC=C(OC=2C(=C(O)C=CC=2)C2=O)C2=C1 JGIDSJGZGFYYNX-YUAHOQAQSA-N 0.000 description 1
- 229940051132 light green sf yellowish Drugs 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229940107698 malachite green Drugs 0.000 description 1
- FDZZZRQASAIRJF-UHFFFAOYSA-M malachite green Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1C(C=1C=CC=CC=1)=C1C=CC(=[N+](C)C)C=C1 FDZZZRQASAIRJF-UHFFFAOYSA-M 0.000 description 1
- 229940012189 methyl orange Drugs 0.000 description 1
- CEQFOVLGLXCDCX-WUKNDPDISA-N methyl red Chemical compound C1=CC(N(C)C)=CC=C1\N=N\C1=CC=CC=C1C(O)=O CEQFOVLGLXCDCX-WUKNDPDISA-N 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
- VVLFAAMTGMGYBS-UHFFFAOYSA-M sodium;4-[[4-(ethylamino)-3-methylphenyl]-(4-ethylimino-3-methylcyclohexa-2,5-dien-1-ylidene)methyl]-3-sulfobenzenesulfonate Chemical compound [Na+].C1=C(C)C(NCC)=CC=C1C(C=1C(=CC(=CC=1)S([O-])(=O)=O)S(O)(=O)=O)=C1C=C(C)C(=NCC)C=C1 VVLFAAMTGMGYBS-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 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
- 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
- C23C22/60—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 alkaline aqueous solutions with pH greater than 8
Definitions
- This invention relates to an improved method of forming aprotecting coating upon articles of magnesium and its alloys. It also concerns a method of coloring such coatings.
- An object of the invention is to provide a method of producing strongly adherent, extremely dense corrosion-resistant coatings on magnesium and its alloys. Another object is to describe such a method in which the coating may be formed in a wide variety of colors.
- protective coatings are produced by subjecting a magnesium or magnesium alloy article to the action of an aqueous alkaline solution, the process being carried out under pressure at a. temperature between about 150 C. and about 250 C.
- Colored coatings may be prepared by adding to the treating solution a dye soluble therein.
- magnesium or magnesium alloy article is first cleaned, as by wire brushing, sandcoatings according to'theinvention are far superior in density and corrosion resistance to coat-' ings prepared by known aqueous or alkaline treat: ments at lower temperatures, and can be produced on any-magnesium-base alloy, rather-than on certain types of alloys only.
- sandblasted metal exhibits a relatively dull coating
- bufied-or polished metal exhibits a 'smooth lustrous surface, after treatment according to the invention.
- the article is immersed in an aqueous alkaline solution, ata temperature between about 150 and 250 C., the treatment beingcarried out in a closed vessel and under a pressure at least equal to the vapor-pressure of the solution at the operating temperature.
- the treating solution is usually made by dissolving in water one or more alkalies, preferably an alkali metal hydroxide, such as sodium, potassium, or lithium hydroxide.
- alkali metal hydroxide such as sodium, potassium, or lithium hydroxide.
- Other alkaline agents such as lime, may sometimesbeemployed, although less satisfactorily.
- Alkali concentrations in the range of 2 to 20 per cent or more by weight are suitable, with about 10 per cent being preferable,
- While the process may be conducted at any temperature between 150 and 250 C., temperatures in the range between about 170 and about 210 C. give definitely superior coatings, and optimum results are obtained at-about 200 C.
- the duration of the treatment may be from 1 to 30 minutes or more, depending'on the temperature, At 200 C. a time of 5 minutes suflices.
- a quantity -of dye corresponding to between about 0.1 and about 0.5 per cent by weight of the solution is used, depending upon the shade desired.
- the coating thus obtained is homogeneously colored throughout, so that if the coating becomes scratched, no serious mar or color streak is evident.
- a metal selected from the class consisting of mag- Safranine GR 343 nesium and magnesium alloys whichcomprises Lanafuchsine ma 54 subjecting the article to the action of a solution Dimethyl-amino-azo-benzene (Butter Yelconsistmg O er a d an alkali
- the alkaline solution is an aqueous solution of an alkali metal hydroxide present'in a. concentration between about 2 and about 20- per cent by weight of the solution, and wherein the treatment is car- I ried out at, a temperature between about C. and about 210 C. y
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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)
- Application Of Or Painting With Fluid Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Description
atented July 29, 1941 1+ rica ooa'rmc MAGNESIUM narrows Herbert K. De Long, Midland, Mich assignor to The Dow Chemical Company,
Midland, IVIiclL,
a corporation of Michigan 4 No Drawing. Application May 24, 1940,
Serial No. 336,962 7 12 Claims.
This invention relates to an improved method of forming aprotecting coating upon articles of magnesium and its alloys. It also concerns a method of coloring such coatings.
An object of the invention is to provide a method of producing strongly adherent, extremely dense corrosion-resistant coatings on magnesium and its alloys. Another object is to describe such a method in which the coating may be formed in a wide variety of colors.
According to the invention, protective coatings are produced by subjecting a magnesium or magnesium alloy article to the action of an aqueous alkaline solution, the process being carried out under pressure at a. temperature between about 150 C. and about 250 C. Colored coatings may be prepared by adding to the treating solution a dye soluble therein.
In practice the magnesium or magnesium alloy article is first cleaned, as by wire brushing, sandcoatings according to'theinvention are far superior in density and corrosion resistance to coat-' ings prepared by known aqueous or alkaline treat: ments at lower temperatures, and can be produced on any-magnesium-base alloy, rather-than on certain types of alloys only.
blasting, acid pickling, or bufing according to the lustre desired in the ultimate coating. The degree of lustre depends upon the smoothness of the metal surface before being subjected to the coating process. 7 For example, sandblasted metal exhibits a relatively dull coating, while bufied-or polished metal exhibits a 'smooth lustrous surface, after treatment according to the invention. After the cleaning operation, the article is immersed in an aqueous alkaline solution, ata temperature between about 150 and 250 C., the treatment beingcarried out in a closed vessel and under a pressure at least equal to the vapor-pressure of the solution at the operating temperature. The treating solutionis usually made by dissolving in water one or more alkalies, preferably an alkali metal hydroxide, such as sodium, potassium, or lithium hydroxide. Other alkaline agents, such as lime, may sometimesbeemployed, although less satisfactorily. Alkali concentrations in the range of 2 to 20 per cent or more by weight are suitable, with about 10 per cent being preferable,
particularly with sodium hydroxide.
While the process may be conducted at any temperature between 150 and 250 C., temperatures in the range between about 170 and about 210 C. give definitely superior coatings, and optimum results are obtained at-about 200 C. The duration of the treatment may be from 1 to 30 minutes or more, depending'on the temperature, At 200 C. a time of 5 minutes suflices.
By the process described there is, produced upon the magnesium or magnesium,alloy article a coatin: which appears to be integral with the article, is relatively thin, flexible, hard and dense. The
Pontacyl Light Green SF Yellowish 670 Malachite Green 657 Wool Green B 737 Janus Green 133 Aniline Red 677 Methyl Red 211 Pigment Scarlet 3B 216 Fast'Crimson 6BL 57 Eosine Yellow 768 Quinaldine Yellow 801 Indian Yellow G 146 Naphthol Yellow 5 1 1'0 Nitrazine Yellow 640 Methyl Violet 680 Crystal Violet 6B 681 Methylene Blue 2BC [922 Aniline Blue 689 Alizarin Blue S 1067 Eosine Bluish 771' Benzo Blue 23 406 Alizarin Blue G 1066 Fast Acid Black -N23 304 Diazine Black H Extra 401' Niagara Sky Blue 63 518 Acid Blue-Black 246 Diamine Black BH 401 Orange 11 151 Orange G 27 A further advantage of the invention is that the coatings can be obtained in a wide variety of colors simply by including in the aqueous alkaline solution a small proportion ofa dye which is soluble therein and is chemically stable under the conditions of treatment. In general, a quantity -of dye corresponding to between about 0.1 and about 0.5 per cent by weight of the solution is used, depending upon the shade desired. The coating thus obtained is homogeneously colored throughout, so that if the coating becomes scratched, no serious mar or color streak is evident.
The following dyes are illustrative of those suitable for use in the process, the number opposite the dye name being that of the Colour Index. 1st edition, January 1924, published by the Society of Dyers and Colourists, Assurance Buildings,
Bradford, Yorkshire, England:
Dye Color Index No.
The foregoing description is illustrative rather than strictly limitative, the invention being coextensive in scope with the following claims.
This application is a continuation-in-part of my co-pending application, Serial No. 224,510, filed August '12, 1938. v
'I claim:
1. The method of pr'oducing a corrosion-resistant coating upon an article formed of a metal selected from the class consisting'of magnesium and magnesium alloys which comprises subjecting the article to the action of a solution con:-
sisting of water and an alkali at a temperature between about 150 C. and about 250 C. and under a pressure at least equal to the vapor presand under a pressure atleast equal to the vapor Dye Color Index No. pressure of the solution at the operating tempera- Methyl Orange 142 ture. Alizarin Y 20% Paste 1040 4 A process according to claim 3 wherein the Fluoresc n 766 temperature is between about 170 C. and about Rosolic Acid, 724 5 210 C. Bismark Brow 331 5. A process according to claim 3 wherein the Phenolphthalein 764 temperature is about 200 C. A i Fnohsine 30 6. A process according to claim 3 wherein the Azo Fu hsi 6B 154 alkali metal hydroxide is sodium hydroxide. RhOdaminE'R 749 10 7. A' process according to claim 3 wherein the Xylene Cyanol FF 715 alkali metal hydroxide is lithium hydroxide. 'cochineal 1239 8. The method of producing a colored corro- Alizarin Cyanine 1050 sion-resistant coating upon an article formed of B d a R 33 a metal selected from the class consisting of mag- Safranine GR 343 nesium and magnesium alloys whichcomprises Lanafuchsine ma 54 subjecting the article to the action of a solution Dimethyl-amino-azo-benzene (Butter Yelconsistmg O er a d an alkali and a small D 1 1 portion of a dye soluble therein, the treatment being carried out at a temperature between about C. and about 250 C. and under a pressure at least equal to the vapor pressure of the solution at the operating temperature.
9. A process according to claim 8 wherein the alkaline solution is an aqueous solution of an alkali metal hydroxide present'in a. concentration between about 2 and about 20- per cent by weight of the solution, and wherein the treatment is car- I ried out at, a temperature between about C. and about 210 C. y
10. An article formed of a metal selected from the class consisting of magnesium and magnesium alloys and having thereon an adherent corrosion-resistant coating produced according to the process of claim 1.
11. An article formedof a metal selected from the class consisting of magnesium and magnesium alloys and having thereon an adherent corrosionresistant coating produced according to the proces of claim 3. v
12. An article formed of a metal selected from the class consisting of magnesium and magnesium alloys and having thereon a homogeneously colored adherent corrosion-resistant coating produced according to the process of claim 8.
HERBERT K. DE LONG.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US336962A US2250473A (en) | 1940-05-24 | 1940-05-24 | Coating magnesium articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US336962A US2250473A (en) | 1940-05-24 | 1940-05-24 | Coating magnesium articles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2250473A true US2250473A (en) | 1941-07-29 |
Family
ID=23318485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US336962A Expired - Lifetime US2250473A (en) | 1940-05-24 | 1940-05-24 | Coating magnesium articles |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2250473A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2456931A (en) * | 1946-12-26 | 1948-12-21 | Dow Chemical Co | Anodizing magnesium alloys |
| US2607185A (en) * | 1950-08-01 | 1952-08-19 | Silverman Leo | Decorative yarn |
| US2987426A (en) * | 1957-01-30 | 1961-06-06 | Ici Ltd | Alkali baths for metal treatment |
| US3108026A (en) * | 1960-10-10 | 1963-10-22 | Du Pont | Coloring of oxide-coated aluminum |
| CN105849315A (en) * | 2013-12-26 | 2016-08-10 | Posco公司 | Color-treated base material and base material color treatment method therefor |
| CN105849316A (en) * | 2013-12-26 | 2016-08-10 | Posco公司 | Substrate treated with color development, and substrate color development treatment method for same |
| US20180202050A1 (en) * | 2015-07-10 | 2018-07-19 | Posco | Color-treated substrate and color treatment method therefor |
-
1940
- 1940-05-24 US US336962A patent/US2250473A/en not_active Expired - Lifetime
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2456931A (en) * | 1946-12-26 | 1948-12-21 | Dow Chemical Co | Anodizing magnesium alloys |
| US2607185A (en) * | 1950-08-01 | 1952-08-19 | Silverman Leo | Decorative yarn |
| US2987426A (en) * | 1957-01-30 | 1961-06-06 | Ici Ltd | Alkali baths for metal treatment |
| US3108026A (en) * | 1960-10-10 | 1963-10-22 | Du Pont | Coloring of oxide-coated aluminum |
| US20160326655A1 (en) * | 2013-12-26 | 2016-11-10 | Posco | Substrate treated with color development, and substrate color development treatment method for same |
| EP3088566A4 (en) * | 2013-12-26 | 2017-03-08 | Posco | Substrate treated with color development, and substrate color development treatment method for same |
| CN105849313A (en) * | 2013-12-26 | 2016-08-10 | Posco公司 | Color-treated base material and base material color treatment method therefor |
| CN105874100A (en) * | 2013-12-26 | 2016-08-17 | Posco公司 | Surface-treated substrate and substrate surface treatment method for same |
| US20160319438A1 (en) * | 2013-12-26 | 2016-11-03 | Posco | Substrate treated with color development, and substrate color development treatment method for same |
| US20160319437A1 (en) * | 2013-12-26 | 2016-11-03 | Posco | Color-treated base material and base material color treatment method therefor |
| CN105849315A (en) * | 2013-12-26 | 2016-08-10 | Posco公司 | Color-treated base material and base material color treatment method therefor |
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| EP3088562A4 (en) * | 2013-12-26 | 2017-03-08 | Posco | Color-treated base material and base material color treatment method therefor |
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| EP3088565A4 (en) * | 2013-12-26 | 2017-03-08 | Posco | Substrate treated with color development, and substrate color development treatment method for same |
| EP3088563A4 (en) * | 2013-12-26 | 2017-03-08 | Posco | Surface-treated substrate and substrate surface treatment method for same |
| CN105849313B (en) * | 2013-12-26 | 2018-03-09 | Posco公司 | The base material of color development treatment and the base material color development treatment method for it |
| CN105849316B (en) * | 2013-12-26 | 2018-06-12 | Posco公司 | The base material of color development treatment and the base material color development treatment method for it |
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| CN105849315B (en) * | 2013-12-26 | 2018-09-21 | Posco公司 | The base material of color development treatment and base material color development treatment method for it |
| US20180202050A1 (en) * | 2015-07-10 | 2018-07-19 | Posco | Color-treated substrate and color treatment method therefor |
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