DE202022002680U1 - Blackening agent for blackening aluminum and iron alloys as well as other metallic materials, stabilized by chromium (III) compounds. - Google Patents
Blackening agent for blackening aluminum and iron alloys as well as other metallic materials, stabilized by chromium (III) compounds. Download PDFInfo
- Publication number
- DE202022002680U1 DE202022002680U1 DE202022002680.3U DE202022002680U DE202022002680U1 DE 202022002680 U1 DE202022002680 U1 DE 202022002680U1 DE 202022002680 U DE202022002680 U DE 202022002680U DE 202022002680 U1 DE202022002680 U1 DE 202022002680U1
- Authority
- DE
- Germany
- Prior art keywords
- compounds
- weight
- bluing agent
- chromium
- iii
- 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.)
- Active
Links
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
- 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
- C23C22/06—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 aqueous acidic solutions with pH less than 6
- C23C22/34—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 aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
-
- 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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Brüniermittel hergestellt aus folgenden Komponenten
0-20 Gew.-% anorganische lösliche Fluoride oder Fluoridkomplexe
0,1 - 50 Gew.-% lösliche Kupfer-(II)-Salze, oder Kupfer-(I)-Verbindungen welche zu Kupfer-(II)-Verbindungen oxidieren
0-50 Gew.-% lösliche Chlorate, Nitrate oder andere anorganische Oxidationsmittel
0,1 - 50 Gew.-% Selendioxid oder eine andere Quelle von löslichem Selen (z.B. Alkaliselenite, selenige Säure)
0-95 Gew.-% einer anorganischen oder organischen Säure dadurch gekennzeichnet, dass das Brüniermittel Chrom-(III)-Verbindungen enthält in einer Konzentration von 0,01 Gew.-% bis 50 Gew.-%Bluing agent made from the following components
0-20% by weight inorganic soluble fluorides or fluoride complexes
0.1 - 50% by weight soluble copper(II) salts or copper(I) compounds which oxidize to form copper(II) compounds
0-50% by weight soluble chlorates, nitrates or other inorganic oxidizers
0.1 - 50% by weight selenium dioxide or another source of soluble selenium (e.g. alkali selenite, selenious acid)
0-95% by weight of an inorganic or organic acid, characterized in that the bluing agent contains chromium(III) compounds in a concentration of 0.01% by weight to 50% by weight
Description
Unter Brünieren versteht man eine Oberflächenbehandlung von Bauteilen aus Stahl oder anderen Werkstoffen mit einem chemischen Mittel zur Erzeugung einer dunklen oder schwarzen Optik zu dekorativen Zwecken. Es wird unterschieden zwischen Heißbrünierungen, welche einen schwachen Korrosionsschutz bieten und Kaltbrünierungen. Bei der Kaltbrünierung handelt es sich um eine chemische Oberflächenreaktion bei der schwarze Substanzen, insbesondere Kupferselenid, gebildet werden.Blackening is a surface treatment of components made of steel or other materials with a chemical agent to create a dark or black appearance for decorative purposes. A distinction is made between hot blueing, which offers weak protection against corrosion, and cold blueing. Cold bluing is a chemical surface reaction that forms black substances, especially copper selenide.
Die Schwarzfärbung kann durch Tauchen in dem Oberflächenbehandlungsmittel oder durch Aufstreichen erzeugt werden.The black coloring can be produced by immersion in the surface treatment agent or by brushing.
Kaltbrünierungen basieren auf der Bildung von Kupferselenid im sauren Medium und enthalten daher ein Kupfersalz wie Kupfersulfat sowie Selendioxid. Das Werkstück wird durch diese Lösung chemisch angeätzt, gleichzeitig dient das Werkstück als Reduktionsmittel für Selendioxid und Kupferionen. Es bildet sich auf der Oberfläche Kupferselenid und das Werkstück färbt sich dunkel bis schwarz.Cold bluing is based on the formation of copper selenide in an acidic medium and therefore contains a copper salt such as copper sulfate and selenium dioxide. The workpiece is chemically etched by this solution, at the same time the workpiece serves as a reducing agent for selenium dioxide and copper ions. Copper selenide forms on the surface and the workpiece turns dark to black.
Der pH-Wert der handelsüblichen Kaltbrünierungen liegt im Bereich von 0 bis 1.The pH value of commercially available cold bluing is in the range from 0 to 1.
Bei höheren pH-Werten ergibt sich das Problem, dass Kupferionen und Selenit, welches aus dem Selendioxid gebildet wird, nicht stabil in Lösung bieiben. Es bildet sich bei einem pH-Wert von größer als 1 schnell Kupferselenit in Form blauer Kristalle. Das so gebildete Kupferselenit steht als Wirkstoff nicht mehr zum Brünieren zur Verfügung und die Brünierlösung erzielt keine guten Ergebnisse mehr.At higher pH values, the problem arises that copper ions and selenite, which is formed from the selenium dioxide, do not remain stably in solution. At a pH greater than 1, copper selenite forms rapidly in the form of blue crystals. The copper selenite formed in this way is no longer available as an active ingredient for blackening and the blackening solution no longer achieves good results.
Bei der Brünierung von Aluminium mit einer Kaltbrünierung ergibt sich das Problem, dass Aluminium bei einem niedrigen pH-Wert von 0 bis 1 stark angegriffen wird und Wasserstoff erzeugt. Dieser naszierende Wasserstoff kann mit dem Brüniermittel Aerosole bilden und in geringem Umfang vermutlich Selendioxid zu Selenwasserstoff reduzieren. Es besteht daher für den Anwender eine Geruchsbelästigung oder sogar eine Gesundheitsgefahr. Zudem haftet das entstehende Kupferselenid durch die Gasentwicklung nur mangelhaft an der Werkstoffoberfläche. Die Abriebfestigkeit solcher Brünierungen ist meist mangelhaft.The problem with the blackening of aluminum with a cold blackening is that aluminum is strongly attacked at a low pH value of 0 to 1 and hydrogen is generated. This nascent hydrogen can form aerosols with the bluing agent and, to a small extent, presumably reduce selenium dioxide to hydrogen selenide. There is therefore an odor nuisance or even a health hazard for the user. In addition, the resulting copper selenide adheres poorly to the material surface due to the gas development. The abrasion resistance of such burnishings is usually poor.
Ziel der Erfindung war es daher ein Brüniermittel bei höherem pH-Wert zu entwickeln bei dem kein Kupferselenit abgeschieden wird und welches eine abriebfeste Schwärzung verursacht.The aim of the invention was therefore to develop a bluing agent at a higher pH value in which no copper selenite is deposited and which causes an abrasion-resistant blackening.
Erreicht wurde dieses Ziel durch Zugabe von wasserlöslichen Chrom-(III)-Salzen, zum Beispiel basischem Chromsulfat mit der ungefähren Zusammensetzung CrSO4(OH). Das Chromsulfat verhindert bei ausreichender Zugabe die Fällung von Kupferselenitkristallen bei der Lagerung und Anwendung.This goal was achieved by adding water-soluble chromium (III) salts, for example basic chromium sulfate with the approximate composition CrSO 4 (OH). When added in sufficient quantities, the chromium sulphate prevents the precipitation of copper selenite crystals during storage and use.
Der pH-Wert kann dann bis zu einem Wert von 2,7 - 2,9 angehoben werden ohne Fällung von Kupferselenit. Bei noch höheren pH-Werten fallen unlösliche Chromsalze aus. Bei einem pH-Wert von 2,7 - 2,9 wird Aluminium nur schwach angegriffen und es bildet sich kaum oder kein Wasserstoff.The pH can then be raised up to a value of 2.7 - 2.9 without precipitation of copper selenite. At even higher pH values, insoluble chromium salts precipitate. At a pH of 2.7 - 2.9, aluminum is only weakly attacked and little or no hydrogen is formed.
Die Stoffmenge von löslichen Chrom-(III)-Verbindungen muss mindestens ein Sechstel der Stoffmenge von Selendioxid betragen. Eine geringere Menge an Chrom-(III)-Verbindungen führt nicht zur Stabilisierung. Es wird eine Komplexierung von Cr-(III)-Ionen durch gebildetes Hydrogenselenit HSeO3 vermutet.The amount of soluble chromium (III) compounds must be at least one sixth of the amount of selenium dioxide. A smaller amount of chromium (III) compounds does not lead to stabilization. A complexation of Cr(III) ions by formed hydrogen selenite HSeO3 is suspected.
Im Folgenden wird die Erfindung anhand eines Beispiels beschrieben:The invention is described below using an example:
Beispiel 1example 1
Ein Brüniermittel wurde aus den folgenden Komponenten hergestellt:
- Benötigte Mengen zur Herstellung von 1 Liter Brüniermittel:
- 11g Natriumfluorid
- 27 g Kupfersulfatpentahydrat
- 38 g Natriumchlorat
- 25 g Schwefelsäure
- 18 g Selendioxid
- 5 g basisches Chromsulfat
- Amounts required to produce 1 liter of bluing agent:
- 11g sodium fluoride
- 27 g copper sulfate pentahydrate
- 38 g sodium chlorate
- 25 grams of sulfuric acid
- 18 g selenium dioxide
- 5 g basic chromium sulfate
Die Komponenten werden in entionisiertem Wasser gelöst und es wird auf ein Endvolumen von 1 Liter mit entionisiertem Wasser aufgefüllt. Nach intensivem Rühren bildet sich eine klare Lösung.The components are dissolved in deionized water and made up to a final volume of 1 liter with deionized water. After intensive stirring, a clear solution forms.
Ein pH Wert von 2,7 wird durch Zugabe von 10%iger Natronlauge eingestellt.A pH of 2.7 is set by adding 10% sodium hydroxide solution.
Die Brünierlösung wird auf ein Aluminiumblech aufgestrichen und bildet innerhalb weniger Sekunden eine schwarze, gut haftende Färbung. Auch nach mehreren Monaten Lagerung kommt es nicht zur Fällung von blauen Kupferselenitkristallen.The bluing solution is applied to an aluminum sheet and forms a black, well-adhering color within a few seconds. Even after several months of storage, there is no precipitation of blue copper selenite crystals.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202022002680.3U DE202022002680U1 (en) | 2022-12-22 | 2022-12-22 | Blackening agent for blackening aluminum and iron alloys as well as other metallic materials, stabilized by chromium (III) compounds. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202022002680.3U DE202022002680U1 (en) | 2022-12-22 | 2022-12-22 | Blackening agent for blackening aluminum and iron alloys as well as other metallic materials, stabilized by chromium (III) compounds. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE202022002680U1 true DE202022002680U1 (en) | 2023-02-20 |
Family
ID=85477655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE202022002680.3U Active DE202022002680U1 (en) | 2022-12-22 | 2022-12-22 | Blackening agent for blackening aluminum and iron alloys as well as other metallic materials, stabilized by chromium (III) compounds. |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE202022002680U1 (en) |
-
2022
- 2022-12-22 DE DE202022002680.3U patent/DE202022002680U1/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3213384A1 (en) | AQUEOUS ACID SOLUTION AND METHOD FOR THE TREATMENT OF RECEIVABLE METAL SUBSTRATES FOR THE AWARD OF A PASSIVATION FILM | |
| DE861184C (en) | Process for the formation of coatings on stainless steels | |
| DE3426666A1 (en) | AQUEOUS ANODIZING SOLUTION | |
| DE69403938T2 (en) | Acidic, aqueous cleaning solution for aluminum and aluminum alloys and cleaning methods | |
| DE4013974C1 (en) | ||
| DE1521880B1 (en) | Process for the treatment of chemically applied coatings on metals with chromium-containing solutions | |
| EP0337411B1 (en) | Process for preparing an acidic passivating bath for zinc, zinc alloys an cadmium surfaces, containing chromium III and fluoride | |
| DE3711095A1 (en) | METHOD FOR PRODUCING CONVERSION SURFACES ON ZINC OR ZINC ALLOY SURFACES | |
| DE2321594C3 (en) | Process for the treatment of aqueous solutions | |
| DE202022002680U1 (en) | Blackening agent for blackening aluminum and iron alloys as well as other metallic materials, stabilized by chromium (III) compounds. | |
| DE69302799T2 (en) | Composition for the treatment of boiler water | |
| DE1900996A1 (en) | Fire retardant sodium chlorate preparations | |
| DE3012226A1 (en) | WATER-REPELLENT, AQUE TREATMENT SOLUTIONS | |
| DE2505020A1 (en) | PROCEDURE TO REDUCE AIR POLLUTING ODORS AND ODOR REMOVING SOLUTION TO CARRY OUT THE PROCEDURE | |
| DE2419819C2 (en) | Process for producing corrosion-resistant black layers on the surface of aluminum or aluminum alloys | |
| DE4135524A1 (en) | Chrome plating of zinc@, cadmium@ and their alloys - using aq. soln. of chromium (III) oxalate complex, at acidic pH to form blue corrosion-resistant coating | |
| DE2239581A1 (en) | SOLUTION AND METHOD FOR APPLYING COATINGS TO ZINC OR ZINC ALLOYS | |
| DE10162756A1 (en) | Schwarzpassivierungsverfahren | |
| DE102008050034B4 (en) | Process for the electrolytic deposition of chromium and chromium alloys | |
| DE641933C (en) | Process to increase the adhesion and service life of coatings of paint, varnish, etc. Like. On corrosion-prone heavy metal surfaces, especially those made of iron and iron alloys | |
| DE1521892B1 (en) | Solution for the formation of a corrosion-resistant chromate-containing coating on metals | |
| DE313578C (en) | ||
| DE2134412A1 (en) | CHROMATE TREATED METAL SHEET AND METHOD FOR MANUFACTURING IT | |
| DE2852756A1 (en) | FLUX FOR DRY GALVANIZATION | |
| DE883382C (en) | Process for coating zinc with a protective coating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R207 | Utility model specification |