US2338924A - Process for the protection of magnesium-base metals - Google Patents
Process for the protection of magnesium-base metals Download PDFInfo
- Publication number
- US2338924A US2338924A US257762A US25776239A US2338924A US 2338924 A US2338924 A US 2338924A US 257762 A US257762 A US 257762A US 25776239 A US25776239 A US 25776239A US 2338924 A US2338924 A US 2338924A
- Authority
- US
- United States
- Prior art keywords
- magnesium
- bath
- alloys
- protection
- metal
- 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 11
- 239000010953 base metal Substances 0.000 title description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 13
- 229910052749 magnesium Inorganic materials 0.000 description 13
- 239000011777 magnesium Substances 0.000 description 13
- 239000000956 alloy Substances 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011253 protective coating Substances 0.000 description 5
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 4
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 229940032330 sulfuric acid Drugs 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 235000011149 sulphuric acid Nutrition 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
- C25D11/38—Chromatising
Definitions
- the object of the present invention is a process for the protection of magnesium and magnesium-base alloys by means of a superficial coating.
- the anodic or electrolytic treatment-of magnesium and its alloys has heretofore generally been effected in alkaline solutions with a view to depositing coatings of oxide, silicates or aluminates, the said solutions sometimes containing in addition other alkaline salts such as borates, chromates, phosphates and molybdates. But coatings so obtained have never given entire satisfaction.
- the pH of the bath should be maintained at less than 2. This may be done by the appropriate addition from time to time of chromic acid and if necessary of sulfuricacid.
- This film consists' of an oxyde of chromium, intermediate be- I have further made the surprising discovery that the above mentioned protective film is porous and far from being of an insulating nature, easily permits the passage of alternating electric current. The voltage across the bath only falls slightly during the electrolytic .treatment and remains almost constant for its duration.
- Example 1 Composition of bath:
- the objects are withdrawn from the bath, copiously rinsed and dried, preferably hot. Subsequently the objects can be subjected to a finishing treatment, for example by means of paraffin, paint, etc., which increases the resistance of the protective coating to corrosion.
- the protective film is porous, one obtains excellent results by means of immersion of the pieces in hot paraflin, for example at about C.
- the previously described bath containing chromic and sulphuric acids has moreover the advantage of being one well suited to the preliminary pickling of the metal objects to be electrolytically treated, with the result that no prior pickling is necessary.
- magnesium or magnesium-base alloys assembled with an other metal such as iron or aluminium
- My invention covers, as new industrial products, not only baths as specified for the electrolytic treatment of magnesium and magneslum-base alloys with a view to producing protective coatings resistant to corrosion, but also all objects in magnesium or its alloys which are covered with the afore described protective coating consisting substantially of an oxyde of chromium, and this protective coating itself.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Chemical Treatment Of Metals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR50432T | 1939-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2338924A true US2338924A (en) | 1944-01-11 |
Family
ID=8685437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US257762A Expired - Lifetime US2338924A (en) | 1939-02-02 | 1939-02-21 | Process for the protection of magnesium-base metals |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2338924A (en, 2012) |
| BE (1) | BE432902A (en, 2012) |
| CH (1) | CH221320A (en, 2012) |
| FR (2) | FR843027A (en, 2012) |
| GB (1) | GB525033A (en, 2012) |
| NL (1) | NL52921C (en, 2012) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3090710A (en) * | 1959-05-27 | 1963-05-21 | Hooker Chemical Corp | Method and solution for producing chromate coatings on zinc and zinc alloys |
-
0
- NL NL52921D patent/NL52921C/xx active
- BE BE432902D patent/BE432902A/xx unknown
-
1938
- 1938-02-25 FR FR843027D patent/FR843027A/fr not_active Expired
-
1939
- 1939-02-02 FR FR50432D patent/FR50432E/fr not_active Expired
- 1939-02-13 GB GB4636/39A patent/GB525033A/en not_active Expired
- 1939-02-14 CH CH221320D patent/CH221320A/fr unknown
- 1939-02-21 US US257762A patent/US2338924A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3090710A (en) * | 1959-05-27 | 1963-05-21 | Hooker Chemical Corp | Method and solution for producing chromate coatings on zinc and zinc alloys |
Also Published As
| Publication number | Publication date |
|---|---|
| CH221320A (fr) | 1942-05-31 |
| GB525033A (en) | 1940-08-20 |
| NL52921C (en, 2012) | |
| FR843027A (fr) | 1939-06-23 |
| BE432902A (en, 2012) | |
| FR50432E (fr) | 1940-06-05 |
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