US2229252A - Process for increasing the resistance to corrosion of light metals and light metal alloys - Google Patents
Process for increasing the resistance to corrosion of light metals and light metal alloys Download PDFInfo
- Publication number
- US2229252A US2229252A US165076A US16507637A US2229252A US 2229252 A US2229252 A US 2229252A US 165076 A US165076 A US 165076A US 16507637 A US16507637 A US 16507637A US 2229252 A US2229252 A US 2229252A
- Authority
- US
- United States
- Prior art keywords
- corrosion
- light
- increasing
- resistance
- metal 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
Links
- 238000000034 method Methods 0.000 title description 10
- 238000005260 corrosion Methods 0.000 title description 8
- 230000007797 corrosion Effects 0.000 title description 8
- 229910001092 metal group alloy Inorganic materials 0.000 title description 5
- 229910052751 metal Inorganic materials 0.000 title description 4
- 239000002184 metal Substances 0.000 title description 4
- 150000002739 metals Chemical class 0.000 title description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 10
- 229910052749 magnesium Inorganic materials 0.000 description 10
- 239000011777 magnesium Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 8
- 239000002904 solvent Substances 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 7
- 239000003792 electrolyte Substances 0.000 description 7
- 230000007935 neutral effect Effects 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 239000003513 alkali Substances 0.000 description 5
- 239000002585 base Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000011241 protective layer Substances 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 150000001298 alcohols Chemical class 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 150000002222 fluorine compounds Chemical class 0.000 description 3
- 150000005846 sugar alcohols Polymers 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000001476 alcoholic effect Effects 0.000 description 2
- 229910001515 alkali metal fluoride Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 2
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 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
- 239000000463 material Substances 0.000 description 1
- -1 of hydrofluorid acid Chemical compound 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc 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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
Definitions
- This invention relates to a process for increasing'the resistance to corrosion-of workpieces of light metals and light metal alloys.
- the present invention aims at providing a process for the production of protective fluoride layers, of satisfactory mechanical and anti-corrosive properties, on light metals, especially magnesium and magnesium alloys, by anodic treatment at ordinary temperatures.
- neutral alkali metal fluorides are employed in alcoholic solution as electrolyte at ordinary
- the preferred solvents used in carrying out the invention are polyhydric alcohols, such as glycerol or glycol, either singly or jointly. Mixtures of polyhydric alcohols with monohydric alcohols are also suitable for the purposes of the invention. Such mixtures may also contain a certain proportion of water when employed as solvents of neutral alkali metal fluorides. In order to improve the adhesion and compactness of the resulting anodic layer, it
- a voltage of at least 50 is necessary, and this can be increased up to 150 volts,
- a working voltage below 50 may be employed.
- the current density is about 1 amp. per sq. decimetre at the outset, but falls very quickly as the operation proceeds, and flnally becomes a mere fraction (about V of the initial value.
- the length of the treatment when using an alcohol ora mixture of alcohols as solvent does not exceed minutes; but in the case of mixtures of alcohol and water, up to 30 minutes are generally required.
- direct current is preferably employed, but use can also be made of twoor poly-phase alternating current or of superimposed, direct and alternating current, or
- Example I The workpiece to be treated, such as a magnesium alloy containing 1% of zinc, 6% of aluminiumand 0.5% of manganese, is suspended as anode in an electrolyte consisting of a solution of 100 grms. of potassium fluoride in 1 litre of ethylene glycol, and a high percentage magnesium alloy is employed as cathode.
- a direct current of 100 volts is passed through the bath'at room temperature (20 to C.) the initial current density amounting to 1 amp. per sq. decimetre of surface.
- a coherent, firmly adherent layer of fluoride has become deposited on the surface of the anode. If desired, this layer can be consolidated by suitable known methods.
- Process for increasing the resistance to corrosion of workpieces of magnesium and 'magnesium base alloys by'formation of a protective layer on such workpieces which comprises employingthe workpiece as the anode in an electrolytic treatmentat room temperature with an electrolyte consisting of a solution of a neutral alkali fluoride in a solvent comprising predominantly glycol.
- nesium base alloys by formation of a protective layer on such workpieces which comprises employing the workpiece as the anode in an electrolytic treatment at room temperature with an electrolyte consisting of a solution of a neutral alkali fluoride in a solvent comprising predominantly an alcohol and also water.
- Process for increasing the resistance to corrosion of workpieces of magnesium and mag- [nesium base alloys by formation of a protective layer on such workpieces which comprises employing the workpiece as the anode in an electrolytic treatment atroom temperature with an electrolyteconsisting of a solution of a neutral alkali fluoride in a'solvent comprising prodominantly an JOSEF MARTIN MICHEL. FRITZ HE'N'NEBERGER.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Electroplating Methods And Accessories (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE483798X | 1936-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2229252A true US2229252A (en) | 1941-01-21 |
Family
ID=6543030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US165076A Expired - Lifetime US2229252A (en) | 1936-09-25 | 1937-09-22 | Process for increasing the resistance to corrosion of light metals and light metal alloys |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2229252A (en, 2012) |
| BE (1) | BE423552A (en, 2012) |
| FR (1) | FR826843A (en, 2012) |
| GB (1) | GB483798A (en, 2012) |
| NL (1) | NL44686C (en, 2012) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2474181A (en) * | 1944-10-23 | 1949-06-21 | Dow Chemical Co | Anodic coating of magnesium |
| US3417004A (en) * | 1966-03-24 | 1968-12-17 | Bell Telephone Labor Inc | Production of aluminum, magnesium, and nickel fluoride films by anodization |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2512563A (en) * | 1946-11-09 | 1950-06-20 | Dow Chemical Co | Method of electrolytically coating magnesium and its alloys |
-
0
- BE BE423552D patent/BE423552A/xx unknown
- NL NL44686D patent/NL44686C/xx active
-
1937
- 1937-09-06 GB GB24339/37A patent/GB483798A/en not_active Expired
- 1937-09-17 FR FR826843D patent/FR826843A/fr not_active Expired
- 1937-09-22 US US165076A patent/US2229252A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2474181A (en) * | 1944-10-23 | 1949-06-21 | Dow Chemical Co | Anodic coating of magnesium |
| US3417004A (en) * | 1966-03-24 | 1968-12-17 | Bell Telephone Labor Inc | Production of aluminum, magnesium, and nickel fluoride films by anodization |
Also Published As
| Publication number | Publication date |
|---|---|
| NL44686C (en, 2012) | |
| GB483798A (en) | 1938-04-26 |
| BE423552A (en, 2012) | |
| FR826843A (fr) | 1938-04-11 |
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