CH417274A - Process for producing a boehmite layer on aluminum objects - Google Patents
Process for producing a boehmite layer on aluminum objectsInfo
- Publication number
- CH417274A CH417274A CH1218562A CH1218562A CH417274A CH 417274 A CH417274 A CH 417274A CH 1218562 A CH1218562 A CH 1218562A CH 1218562 A CH1218562 A CH 1218562A CH 417274 A CH417274 A CH 417274A
- Authority
- CH
- Switzerland
- Prior art keywords
- producing
- boehmite layer
- aluminum
- objects
- aluminum objects
- Prior art date
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 8
- 229910052782 aluminium Inorganic materials 0.000 title claims description 8
- 229910001593 boehmite Inorganic materials 0.000 title claims description 8
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 7
- 239000000243 solution Substances 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 235000011007 phosphoric acid Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 244000292411 Excoecaria agallocha Species 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/02—Light metals
- C23F3/03—Light metals with acidic solutions
-
- 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
- C23C22/60—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 alkaline aqueous solutions with pH greater than 8
- C23C22/66—Treatment of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/18—Polishing of light metals
- C25F3/20—Polishing of light metals of aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Zusatzpatent zum Hauptpatent Nr. 400 718 Verfahren zur Erzeugung einer Böhmitschicht auf Aluminiumgegenständen Das Hauptpatent Nr. 400 718 bezieht sich auf ein Verfahren zur Erzeugung einer Böhmitschicht auf Aluminiumgegenständen durch Behandlung mit einer heissen, wässerigen Triäthanolaminlösung, dadurch gekennzeichnet, dass eine Lösung verwendet wird, die höchstens 0,3 % Triäthanolamin enthält.
Die vorliegende Erfindung bezieht sich auf das Verfahren zur Erzeugung einer Böhmitschicht auf Aluminiumgegenständen nach dem Patentanspruch des Hauptpatentes, dadurch gekennzeichnet, dass die Gegenstände vor dem Erzeugen der Böhmitschicht rein chemisch oder elektrochemisch geglänzt werden.
Es ist bekannt, dass Gegenstände aus Aluminium, z. B. Küchen- und Campinggeräte, Drähte, Draht- geflechte, Nieten, Schrauben beim Lagern vor dem Verkauf oder beim Gebrauch infolge leichter Korro sion unansehnlich werden, insbesondere wenn sie che misch oder elektrochemisch geglänzt und nicht nach träglich anodisch oxydiert worden sind.
Ausserdem sind Gegenstände aus aushärtbaren Aluminiumlegierungen nach dem Lösungsglühen und Abschrecken oft mit einer unansehnlichen, grauen Oxidschicht bedeckt, die durch chemisches oder elektrochemisches Glänzen weggelöst wird. Die so erhaltenen glänzenden Ober flächen sollen mindestens beim Lagern ihren Glanz beibehalten, ohne dass eine teure anodische Oxydation angewendet werden muss.
Es hat sich nun gezeigt, dass eine nach dem Patentanspruch des Hauptpatentes erzeugte Böhmit- schicht geeignet ist, diese Aufgabe zu erfüllen.
Die Behandlung in der heissen Triäthanolamin- Lösung dauert wenige Minuten, z. B. 3 bis 10 min. Massenartikel werden bei der Ausführung des er- findungsgemässen Verfahrens vorzugsweise rein che misch geglänzt.
Es sind zahlreiche Verfahren zum chemischen Glänzen von Aluminium und Aluminiumlegierungen bekannt. Nach einem dieser Verfahren werden die Teile während 3 bis 5 min in einer 90 bis<B>95'</B> C warmen, wässerigen Lösung von 95 Vol.% Ortho- phosphorsäure (d = 1,75), 5 VolA konzentrierter Salpetersäure (d = 1,4) und 0,2 GewA NiS04 - 7H20 behandelt.
Unter den elektrochemischen Glänzverfahren für Aluminium und Aluminiumlegierungen sei z. B. fol gendes erwähnt: Es wird mit einem 70 bis, 80 C warmen Elektrolyten gearbeitet, der aus 70 Volum- teilen konzentrierter Schwefelsäure (d = 1,84), 15 Vol.% 60 % iger Orthophosphorsäure (d = 1,7) und 15 VolA Wasser mit einem Zusatz von 0,5 bis 1 VolA 50 % iger Salpetersäure (35 Baume)
besteht. Es wird eine Spannung von 12 bis 18 V angelegt, wodurch sich eine anodische Stromdichte von 10 bis 15 A/dm2 ergibt. Die Dauer der Behandlung beträgt 1-8 min.
Die Behandlung in der heissen Triäthanolamin- Lösung wird sofort im Anschluss an das Glänzen und Spülen in Wasser vorgenommen.
Additional patent to main patent No. 400 718 Process for producing a boehmite layer on aluminum objects The main patent No. 400 718 relates to a process for producing a boehmite layer on aluminum objects by treatment with a hot, aqueous triethanolamine solution, characterized in that a solution is used which Contains a maximum of 0.3% triethanolamine.
The present invention relates to the method for producing a boehmite layer on aluminum objects according to the patent claim of the main patent, characterized in that the objects are polished chemically or electrochemically prior to producing the boehmite layer.
It is known that articles made of aluminum, e.g. B. kitchen and camping equipment, wires, wire mesh, rivets, screws become unsightly when stored before sale or during use due to slight corrosion, especially if they are chemically or electrochemically polished and have not been subsequently anodically oxidized.
In addition, objects made of hardenable aluminum alloys are often covered with an unsightly gray oxide layer after solution heat treatment and quenching, which is dissolved away by chemical or electrochemical glossing. The glossy surfaces obtained in this way should at least retain their gloss during storage without the need for expensive anodic oxidation.
It has now been shown that a boehmite layer produced according to the patent claim of the main patent is suitable for fulfilling this task.
The treatment in the hot triethanolamine solution takes a few minutes, for. B. 3 to 10 min. When the method according to the invention is carried out, mass-produced articles are preferably given a purely chemical shine.
Numerous methods of chemically brightening aluminum and aluminum alloys are known. According to one of these processes, the parts are for 3 to 5 minutes in a 90 to 95 ° C warm, aqueous solution of 95% by volume of orthophosphoric acid (d = 1.75), 5% by volume of concentrated nitric acid (d = 1.4) and 0.2 GewA NiS04 - 7H20 treated.
Among the electrochemical polishing processes for aluminum and aluminum alloys, e.g. B. The following is mentioned: An electrolyte with a temperature of 70 to .80 C is used, which is composed of 70 parts by volume of concentrated sulfuric acid (d = 1.84), 15% by volume of 60% orthophosphoric acid (d = 1.7) and 15 VolA water with an addition of 0.5 to 1 VolA 50% nitric acid (35 Baume)
consists. A voltage of 12 to 18 V is applied, resulting in an anodic current density of 10 to 15 A / dm2. The duration of the treatment is 1-8 min.
The treatment in the hot triethanolamine solution is carried out immediately after the polishing and rinsing in water.
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1218562A CH417274A (en) | 1962-03-30 | 1962-10-17 | Process for producing a boehmite layer on aluminum objects |
| GB1259763A GB985300A (en) | 1962-03-30 | 1963-03-29 | Process for coating aluminium articles |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH386662A CH400718A (en) | 1962-03-30 | 1962-03-30 | Process for producing a boehmite layer on aluminum objects |
| CH1218562A CH417274A (en) | 1962-03-30 | 1962-10-17 | Process for producing a boehmite layer on aluminum objects |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH417274A true CH417274A (en) | 1966-07-15 |
Family
ID=25694040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH1218562A CH417274A (en) | 1962-03-30 | 1962-10-17 | Process for producing a boehmite layer on aluminum objects |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH417274A (en) |
-
1962
- 1962-10-17 CH CH1218562A patent/CH417274A/en unknown
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