US3761364A - Self coloring anodic oxidation process for aluminum and its alloys - Google Patents
Self coloring anodic oxidation process for aluminum and its alloys Download PDFInfo
- Publication number
- US3761364A US3761364A US00234682A US3761364DA US3761364A US 3761364 A US3761364 A US 3761364A US 00234682 A US00234682 A US 00234682A US 3761364D A US3761364D A US 3761364DA US 3761364 A US3761364 A US 3761364A
- Authority
- US
- United States
- Prior art keywords
- aluminum
- cathodes
- alloys
- electrolytic
- self
- 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 abstract description 17
- 230000008569 process Effects 0.000 title abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 title abstract description 13
- 238000004040 coloring Methods 0.000 title abstract description 12
- 229910045601 alloy Inorganic materials 0.000 title abstract description 9
- 239000000956 alloy Substances 0.000 title abstract description 9
- 230000003647 oxidation Effects 0.000 title abstract description 8
- 238000007254 oxidation reaction Methods 0.000 title abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 7
- 239000008151 electrolyte solution Substances 0.000 abstract description 6
- 230000001590 oxidative effect Effects 0.000 abstract description 6
- 238000007710 freezing Methods 0.000 abstract description 5
- 230000008014 freezing Effects 0.000 abstract description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 12
- 239000002244 precipitate Substances 0.000 description 9
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 8
- 239000011976 maleic acid Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 7
- 239000003792 electrolyte Substances 0.000 description 7
- 230000006872 improvement Effects 0.000 description 7
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- 150000001735 carboxylic acids Chemical class 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 235000006408 oxalic acid Nutrition 0.000 description 4
- 235000011149 sulphuric acid Nutrition 0.000 description 4
- 239000001117 sulphuric acid Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229940021013 electrolyte solution Drugs 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910001095 light aluminium alloy Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment 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
- C25D11/14—Producing integrally coloured layers
Definitions
- the present invention relates to an improvement in the self-coloring anodic oxidation process for aluminum and its alloys, an improvement that allows one to reduce the consumption of the components constituting the electrolytic system and to reduce the formation of precipitates from that system.
- An object of this invention is that of providing an improvement in the self-coloring anodic oxidizing process for aluminum and its alloys by which the previouslymentioned drawbacks will be eliminated or at least very considerably reduced.
- an object of the present invention is that of providing a process that will reduce to a minimum the formation of precipitates from the electrolytic solution and consequently will reduce the harmful cloggings of the installation and reduction of the exchange capacities of the refrigerating apparatus and of the ion exchanging resin columns.
- a further object of this invention is that of providing a process which will reduce the consumption of the components of the electrolytic system which is used, with considerable practical and economical advantages, thereby obtaining also an improved constancy of composition of the electrolytic system and therefore an improved reproducibility of the colorings obtained in the anodic coating, without requiring frequent and costly additions of electrolyte.
- the carboxylic acid component may be selected from maleic, oxalic or tartaric acid either alone or in a binary or ternary combination thereof, and generally also in the presence of sulphuric acid.
- the cooling of the cathodes is generally carried out by circulating inside the cathodes a conventional refrigerating fluid, for instance by using h'ollow cathodes or cathodes provided with coils incorporated therein.
- the refrigerating fluid must have an inflow temperature to the cathodes below 25 C.; such a temperature must however be higher than the temperature that would bring about freezing of the electrolytic solution used in the cell.
- EXAMPLE 1 The anodic oxidation was carried out in successive batches of 50 minutes each and at a temperature of 22 C. at 1.5 a./dm. through a self-coloring electrolyte of the MS-type consisting of an aqueous solution of maleic
- a tank of about 150 liters capacity fitted with an ion-exchange column and an external heat exchanger.
- AISI 316 stainless steel pipes
- Running water was circulated within the pipes as refrigerating fluid, the running water having an inflow temperature of 125- 13 C.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
- Primary Cells (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2175371 | 1971-03-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3761364A true US3761364A (en) | 1973-09-25 |
Family
ID=11186371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00234682A Expired - Lifetime US3761364A (en) | 1971-03-15 | 1972-03-14 | Self coloring anodic oxidation process for aluminum and its alloys |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3761364A (en:Method) |
| BE (1) | BE780636A (en:Method) |
| CH (1) | CH567109A5 (en:Method) |
| DE (1) | DE2211845A1 (en:Method) |
| FR (1) | FR2130193B1 (en:Method) |
| GB (1) | GB1339878A (en:Method) |
| NL (1) | NL7203204A (en:Method) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4056449A (en) * | 1974-10-31 | 1977-11-01 | Diamond Shamrock Technologies S.A. | Electrowinning method |
| WO2020215041A1 (en) * | 2019-04-18 | 2020-10-22 | Lopez Steven | Fluorescent anodization dye and associated methods |
-
1972
- 1972-03-10 NL NL7203204A patent/NL7203204A/xx not_active Application Discontinuation
- 1972-03-11 DE DE19722211845 patent/DE2211845A1/de active Pending
- 1972-03-13 GB GB1155472A patent/GB1339878A/en not_active Expired
- 1972-03-13 CH CH366372A patent/CH567109A5/xx not_active IP Right Cessation
- 1972-03-14 BE BE780636A patent/BE780636A/xx unknown
- 1972-03-14 FR FR7208769A patent/FR2130193B1/fr not_active Expired
- 1972-03-14 US US00234682A patent/US3761364A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4056449A (en) * | 1974-10-31 | 1977-11-01 | Diamond Shamrock Technologies S.A. | Electrowinning method |
| WO2020215041A1 (en) * | 2019-04-18 | 2020-10-22 | Lopez Steven | Fluorescent anodization dye and associated methods |
Also Published As
| Publication number | Publication date |
|---|---|
| CH567109A5 (en:Method) | 1975-09-30 |
| BE780636A (fr) | 1972-09-14 |
| GB1339878A (en) | 1973-12-05 |
| NL7203204A (en:Method) | 1972-09-19 |
| FR2130193B1 (en:Method) | 1977-04-01 |
| FR2130193A1 (en:Method) | 1972-11-03 |
| DE2211845A1 (de) | 1972-09-28 |
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