US2348826A - Coating of objects of magnesium or the like with oxides - Google Patents
Coating of objects of magnesium or the like with oxides Download PDFInfo
- Publication number
- US2348826A US2348826A US238976A US23897638A US2348826A US 2348826 A US2348826 A US 2348826A US 238976 A US238976 A US 238976A US 23897638 A US23897638 A US 23897638A US 2348826 A US2348826 A US 2348826A
- Authority
- US
- United States
- Prior art keywords
- magnesium
- objects
- oxides
- coating
- bath
- 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
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title description 9
- 229910052749 magnesium Inorganic materials 0.000 title description 9
- 239000011777 magnesium Substances 0.000 title description 9
- 239000011248 coating agent Substances 0.000 title description 2
- 238000000576 coating method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 description 8
- 239000011241 protective layer Substances 0.000 description 8
- 239000003513 alkali Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000007792 addition Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical class [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 150000004645 aluminates Chemical class 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
- 239000007864 aqueous solution Substances 0.000 description 2
- OZECDDHOAMNMQI-UHFFFAOYSA-H cerium(3+);trisulfate Chemical compound [Ce+3].[Ce+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O OZECDDHOAMNMQI-UHFFFAOYSA-H 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000012505 colouration Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
Definitions
- This invention relates to the production or surface layers of oxide on objects made of magnesium or oi alloys consisting principally of magnesium by anodic treatment in alkaline solution.
- the process according to the invention differs essentially in that the anodic treatment is carried out in aqueous solutions of alkali salts of such metal oxides as have an amphoteric character, e. g. in solutions or alkali aluminates, arsenates or zincates.
- the protective layers obtained from such solutions are distinguished by high resistance to corrosion, great hardness and density, and good insulating power.
- the alkalinity of the solution is maintained at a pH number oi about to 13 and the solution is kept at an elevated temperature, e. g. at a bath temperature of 30 to 70 C.
- the 'anodic' oxidation can be assisted according to the invention, by the addition of oxygen carriers, e. g. by the addition of small amounts oi cerium sulphate, or 01' tungstates or chromates.
- the protective layers of oxide which are obtainedby anodic treatment in baths of known composition can be considerably improved' as regards density, hardness, insulating power and resistance to corrosion by a or a preliminary or interto the invention.
- the treatment in such baths as contain alkali arsenates has been found to be particularly advantageous while moreover solutions of alkali aluminates produce specially favourable results.
- the solutions of these salts ofi'er also the special advantage that the metal (aluminium) is not cathodically deposited.
- the conductivity oi. the baths is so regulated by suitable regulation or the concentration and temperature that the process is worked with currents of 1 to 3 amps. per sq. dm.
- the bath temperature e g. to 60 to 85 C. there are obtained dark or deep black coloured protective layers.
- the protective layers obtained according to the invention can subsequently be coloured with organic or inorganic dyestuil's. or coated with lacquers.
- the protective layers can also be sealed and hardened by treatment with water glass'and subsequent heating to about 150 C.
- Example 1 Water litre 1 Sodium aluminate "grams.- 200 Cerium sulphate do 3 if desired acid or alkali additions are made thereto until the desired pH value is obtained.
- the process can be carried out using direct or alternating current. Whilst hitherto in the superficial oxidation of magnesium and magnesium containing alloys, alternating current had to be used, an advantage of the new process consists in that sufliciently strong protective layers can be obtained by the use of direct current under relatively low voltages e. g. 10 volts and with current densities which are about as high as those usual in the anodic oxidation of aluminium in aqueous solutions.
- the protective layers obtained according to the new process produce even on profiled objects a good cormsion resistance and possess a high absorptive power for sealing agents such as water glass.
- a process for the production of protective layers of oxide on objects made of magnesium or magnesium alloys comprising making said objects the anode in a bath containing an alkali a'rsenate, and passing an electricv current through said bath.
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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2348826X | 1937-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2348826A true US2348826A (en) | 1944-05-16 |
Family
ID=7995249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US238976A Expired - Lifetime US2348826A (en) | 1937-11-18 | 1938-11-05 | Coating of objects of magnesium or the like with oxides |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2348826A (fr) |
| FR (1) | FR844066A (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3293158A (en) * | 1963-09-17 | 1966-12-20 | Mcneill William | Anodic spark reaction processes and articles |
| US3620940A (en) * | 1970-05-12 | 1971-11-16 | Us Army | Method of inducing polarization of active magnesium surfaces |
-
1938
- 1938-09-28 FR FR844066D patent/FR844066A/fr not_active Expired
- 1938-11-05 US US238976A patent/US2348826A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3293158A (en) * | 1963-09-17 | 1966-12-20 | Mcneill William | Anodic spark reaction processes and articles |
| US3620940A (en) * | 1970-05-12 | 1971-11-16 | Us Army | Method of inducing polarization of active magnesium surfaces |
Also Published As
| Publication number | Publication date |
|---|---|
| FR844066A (fr) | 1939-07-18 |
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