GB558983A - Improvements in and relating to the protective surface treatment of magnesium base alloys - Google Patents
Improvements in and relating to the protective surface treatment of magnesium base alloysInfo
- Publication number
- GB558983A GB558983A GB449742A GB449742A GB558983A GB 558983 A GB558983 A GB 558983A GB 449742 A GB449742 A GB 449742A GB 449742 A GB449742 A GB 449742A GB 558983 A GB558983 A GB 558983A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mixed
- magnesium
- dichromate
- cations
- acids
- 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
Links
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
- C23C22/06—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
- C23C22/24—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 containing hexavalent chromium compounds
- C23C22/26—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 containing hexavalent chromium compounds containing also organic compounds
- C23C22/27—Acids
Landscapes
- 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)
- Chemically Coating (AREA)
Abstract
558.983. Coating metals. MAGNESIUM METAL CORPORATION, Ltd., and COATES, G. E. April 3, 1942. Nos. 4497/42 and 6718/43. Drawings to Specification. [Classes 82 (i) and 82 (ii)] In a process for the protective surface treatment of magnesium base alloys, the latter are treated with solutions having a dichromate concentration exceeding 0.05 mols. per litre, a sulphate concentration exceeding 0.2 mols. per litre and a hydrogen ion concentration controlled by a buffer agent or agents with the pH range 4-6 as measured by a glass electrode, the constituent salts of the bath being so selected that within the pH range their cations remain in stable solution and the upper limits for the dichromate and sulphate concentrations corresponding to saturation point in the particular solutions used and temperature of use. The required dichromate content may be provided by the dichromates singly or mixed of hydrogen, lithium, sodium, magnesium or potassium and the sulphate concentration by the sulphates alone or mixed, of hydrogen, lithium, sodium, magnesium or potassium. An ammonium salt may be used to supply the whole or part of the dichromate or sulphate or both. For cold solutions the buffer agent comprises single or mixed acids or single or mixed salts of the acids and preferably of acetic, propionic, butyric, valeric, malonic, succinnic, glutaric, adipic, penolic or pthalic acid, the cations of the salt being those of lithium, sodium, magnesium, potassium or ammonium, and for hot solutions single or mixed acids or single or mixed salts of these acids such as caproic, oenanthic, malonic, succinnic &c. and the cations of the same elements as before. Alternatively the cations may be chosen from the group consisting of tetra methyl ammonium ions, tetra ethyl ammonium ions and N methyl-pyridinium ions. Specifications 287,450, 305,197, 331,853, [all in Class 82(ii)]. 353,415, 450,589, 482,689, 506,836, 510,353, 510,487; 550,175 and 550,176, [both in Group XXXVI], are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB449742A GB558983A (en) | 1942-04-03 | 1942-04-03 | Improvements in and relating to the protective surface treatment of magnesium base alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB449742A GB558983A (en) | 1942-04-03 | 1942-04-03 | Improvements in and relating to the protective surface treatment of magnesium base alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB558983A true GB558983A (en) | 1944-01-31 |
Family
ID=9778298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB449742A Expired GB558983A (en) | 1942-04-03 | 1942-04-03 | Improvements in and relating to the protective surface treatment of magnesium base alloys |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB558983A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2480448A (en) * | 1943-04-28 | 1949-08-30 | Permanente Metals Corp | Protective surface treatment of magnesium base alloys |
| US2628925A (en) * | 1947-06-24 | 1953-02-17 | Rheem Mfg Co | Bright corrosion resistant coating of metals |
| US3087834A (en) * | 1961-04-04 | 1963-04-30 | Dow Chemical Co | Process for vitreous enameling of magnesium and its alloys |
-
1942
- 1942-04-03 GB GB449742A patent/GB558983A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2480448A (en) * | 1943-04-28 | 1949-08-30 | Permanente Metals Corp | Protective surface treatment of magnesium base alloys |
| US2628925A (en) * | 1947-06-24 | 1953-02-17 | Rheem Mfg Co | Bright corrosion resistant coating of metals |
| US3087834A (en) * | 1961-04-04 | 1963-04-30 | Dow Chemical Co | Process for vitreous enameling of magnesium and its alloys |
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