US2364964A - Process for protecting articles made of light metals - Google Patents
Process for protecting articles made of light metals Download PDFInfo
- Publication number
- US2364964A US2364964A US245780A US24578038A US2364964A US 2364964 A US2364964 A US 2364964A US 245780 A US245780 A US 245780A US 24578038 A US24578038 A US 24578038A US 2364964 A US2364964 A US 2364964A
- Authority
- US
- United States
- Prior art keywords
- bath
- article
- light metals
- articles made
- protecting
- 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 7
- 229910052751 metal Inorganic materials 0.000 title description 6
- 239000002184 metal Substances 0.000 title description 6
- 150000002739 metals Chemical class 0.000 title description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 150000004645 aluminates Chemical class 0.000 description 7
- 150000001450 anions Chemical class 0.000 description 6
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 5
- 229910001388 sodium aluminate Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000004115 Sodium Silicate Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 229940032158 sodium silicate Drugs 0.000 description 3
- 229910052911 sodium silicate Inorganic materials 0.000 description 3
- 235000019794 sodium silicate Nutrition 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 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
- 230000007423 decrease Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000005406 washing Methods 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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/20—Electrolytic after-treatment
-
- 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
- C25D11/04—Anodisation of aluminium or alloys based thereon
-
- 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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
Definitions
- the present invention has for its object a process for protecting articles made of light metals such as aluminum, magnesium or alloys.
- a protecting layer of oxide for example of alumina
- anions of the electrolytic bath are alsodeposited thereon in a more or less large quantity. Said anions, in general, react on the oxide and produce salts which most of the time dissolve in the bath.
- the anions of the bath neutralize a part of the oxidation of the article, thereby decreasing the efficiency of the electrolytic operation and the density and the uniformity of the protecting layer.
- the object of the present invention is in pardecimetre in dilute and slightly alkaline solu tions.
- the article which has been treated in the above indicated manner is advantageously washed with ammoniacal water in order to precipitate the alumina A1203, nHaO which might remain in the ticular to eliminate this drawback, and consists in using a bath wherein the anion not only does not have the harmful effect mentioned above, but on the contrary also contributes to decreasing the porosity of the oxide layer.
- an electrolytic bath containing an aluminate is used. This bath producesan anion which forms an aluminate with the alumina or magnesia present on the article treated.
- the anions of the bath contribute to reinforcing the protecting layer of the article.
- the aluminate In order to improve the conductivity of the bath, it is advantageous to add to the aluminate a small quantity of an alkaline base, but the quantity of base must not exceed 20% of that of the aluminate present in the bath.
- This washing may be replaced, or followed,
- the present invention also covers any electrolytic bath for protecting light metals, in particular aluminum, or magnesium and contain- Grams Sodium aluminate 30 Sodium silicate 10 Caustic soda, 8
- Alternating current is passed through the bath; into which compressed air is blown in order to keep its temperature at about 15 C.
- the current is supplied from the outset at a voltage of volts and its initial strength is 15 amperes per square decimetre of area of' the article to be treated. In less than two minutes,
- a process for protecting an aluminum or an aluminum alloy article against corrosion comprising immersing the article to be protected in a bath consisting of approximately 30 grams of sodium aluminate, 10 grams of sodium silicate and 8 grams of caustic soda per liter of solution having a pH between 8.5 and 12 and then passing between said article serving as an electrode in said bath and another electrode therein an electric current having an initial potential greater than 30 volts.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Paints Or Removers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR840012T | 1937-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2364964A true US2364964A (en) | 1944-12-12 |
Family
ID=9299853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US245780A Expired - Lifetime US2364964A (en) | 1937-12-17 | 1938-12-14 | Process for protecting articles made of light metals |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2364964A (enrdf_load_stackoverflow) |
| BE (1) | BE431557A (enrdf_load_stackoverflow) |
| CH (1) | CH224221A (enrdf_load_stackoverflow) |
| FR (1) | FR840012A (enrdf_load_stackoverflow) |
| GB (1) | GB522571A (enrdf_load_stackoverflow) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2497036A (en) * | 1944-07-12 | 1950-02-07 | Cons Vultee Aircraft Corp | Coating magnesium and magnesium base alloys |
| US2538831A (en) * | 1946-07-09 | 1951-01-23 | Cons Vultee Aircraft Corp | Coloring of magnesium and alloys thereof |
| US3293158A (en) * | 1963-09-17 | 1966-12-20 | Mcneill William | Anodic spark reaction processes and articles |
| US4551211A (en) * | 1983-07-19 | 1985-11-05 | Ube Industries, Ltd. | Aqueous anodizing solution and process for coloring article of magnesium or magnesium-base alloy |
| CN105525326A (zh) * | 2014-12-22 | 2016-04-27 | 比亚迪股份有限公司 | 一种铝合金壳体的制备方法及铝合金壳体 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3376205A (en) * | 1964-07-15 | 1968-04-02 | Samuel L Cohn | Method of reviving silicate sealing solutions |
| US4166777A (en) * | 1969-01-21 | 1979-09-04 | Hoechst Aktiengesellschaft | Corrosion resistant metallic plates particularly useful as support members for photo-lithographic plates and the like |
-
0
- BE BE431557D patent/BE431557A/xx unknown
-
1937
- 1937-12-17 FR FR840012D patent/FR840012A/fr not_active Expired
-
1938
- 1938-12-09 GB GB35947/38A patent/GB522571A/en not_active Expired
- 1938-12-10 CH CH224221D patent/CH224221A/fr unknown
- 1938-12-14 US US245780A patent/US2364964A/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2497036A (en) * | 1944-07-12 | 1950-02-07 | Cons Vultee Aircraft Corp | Coating magnesium and magnesium base alloys |
| US2538831A (en) * | 1946-07-09 | 1951-01-23 | Cons Vultee Aircraft Corp | Coloring of magnesium and alloys thereof |
| US3293158A (en) * | 1963-09-17 | 1966-12-20 | Mcneill William | Anodic spark reaction processes and articles |
| US4551211A (en) * | 1983-07-19 | 1985-11-05 | Ube Industries, Ltd. | Aqueous anodizing solution and process for coloring article of magnesium or magnesium-base alloy |
| CN105525326A (zh) * | 2014-12-22 | 2016-04-27 | 比亚迪股份有限公司 | 一种铝合金壳体的制备方法及铝合金壳体 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR840012A (fr) | 1939-04-18 |
| CH224221A (fr) | 1942-11-15 |
| GB522571A (en) | 1940-06-21 |
| BE431557A (enrdf_load_stackoverflow) |
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