DE718601C - Process for the surface treatment of zinc alloys containing aluminum - Google Patents
Process for the surface treatment of zinc alloys containing aluminumInfo
- Publication number
- DE718601C DE718601C DEM148520D DEM0148520D DE718601C DE 718601 C DE718601 C DE 718601C DE M148520 D DEM148520 D DE M148520D DE M0148520 D DEM0148520 D DE M0148520D DE 718601 C DE718601 C DE 718601C
- Authority
- DE
- Germany
- Prior art keywords
- aluminum
- zinc alloys
- zinc
- surface treatment
- containing aluminum
- 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
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
- C23C22/60—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
- C23C22/67—Treatment of aluminium or alloys based thereon with solutions containing 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)
Description
Verfahren zur Oberflächenbehandlung von aluminiumhaltigen Zinklegierungen Es ist bekannt, Zinklegierungen mit einer Es ist bekannt, Zinklegierungen mit einer Oberflächenschutzschicht dadurch zu versehen, daß man die zu schützenden Gegenstände mit einer sauren Lösung von Chromsalzen, beispielsweise einer schwefelsaurer Kaliumbichromatlösung, behandelt. Die so hergestellten Schichten geben, einen guten Korrosionsschutz. Sie zeigen jedoch verhältnismäßig geringe Abriebfestigkeit. Es ist weiterbin vorgeschlagen worden, Zinklegierungen dadurch mit einem Überzug zu versehen, daß man sie in eine Lösung taucht, welche Kaliumbichromat und daneben Nickelchlorid, Zinkchlorid, Ammoniumchlorid, Ammoniumthiocyanat enthält.Process for the surface treatment of zinc alloys containing aluminum It is known to use zinc alloys with a. It is known to use zinc alloys with a Surface protective layer to be provided by the objects to be protected with an acidic solution of chromium salts, for example a sulfuric acid potassium dichromate solution, treated. The layers produced in this way provide good protection against corrosion. she however, show relatively poor abrasion resistance. It is still suggested have been to provide zinc alloys with a coating that they are in a Solution dips, which potassium dichromate and next to it nickel chloride, zinc chloride, ammonium chloride, Contains ammonium thiocyanate.
Man kennt weiterhin Verfahren zur Oberflächenbehandlung mit alkalischen Chromsalzlösungen. Solche alkalischen. Chromatbäder werden zur von Aluminium und Aluminiumlegierungen vielfach angewendet. Auf Zink und seinen Legierungen geben diese Bäder jedoch keine sichtbaren Schutzschichten, auch dann nicht, wenn die Zinklegierungen Aluminium als Legierungsbestandteil enthalten.Processes for surface treatment with alkaline are also known Chromium salt solutions. Such alkaline. Chromate baths are used for aluminum and Aluminum alloys are widely used. Give on zinc and its alloys However, these baths do not have any visible protective layers, even if the zinc alloys Contains aluminum as an alloy component.
Es wurde nun gefunden, daß es überraschenderweise gelingt, aluminiumhaltige Zinklegierungen in alkalischen Chromatlösungen mit einer sichtbaren porösen Schutzschicht zu versehen, wenn die Gegenstände aus aluminiumhaltiger Zinklegierung zuvor einer Beizung in einer sauren Lösung unterworfen werden. Das Verfahren ist auch dann anwendbar, wenn die Zinklegierung neben dem Aluminium noch andere Legierungsbestandteile, wie z. B. Kupfer oder Magnesium, enthält. Zur Herstellung der Schutzschicht sind alle alkalischen Chromatlösungen unter den für diese üblichen Bedingungen an bei: spielsweise Konzentration und Temperatur verwendbar, die für Aluminium und seine Legierungen bekannt sind, desgleichen die dort bekanten Nachbehandlungsverfahren, wie Dichten, beispielsweise mit Wasserglas, Färben, Lackierneu usw.It has now been found that, surprisingly, it is possible to produce aluminum-containing Zinc alloys in alkaline chromate solutions with a visible porous protective layer to be provided if the items made of aluminum-containing zinc alloy have previously been one Be subjected to pickling in an acidic solution. The procedure can also be used if the zinc alloy contains other alloy components in addition to aluminum, such as z. B. copper or magnesium. To make the protective layer are all alkaline chromate solutions under the usual conditions for these: for example Concentration and temperature usable for aluminum and its alloys are known, as are those there known post-treatment processes, such as sealing, for example with water glass, dyeing, repainting, etc.
Als Beispiel sei erwähnt, daß sich auf einer Legierung mit Io% Aluminium und o,5% Kupfer, Rest Feinzink, ein fester, dicht haftender Überzug ven grauer Farbe dadurch erzeugen läßt, daß man beispielsweise Bleche aus dieser Legierung 2 Minuten lang in einer Io%igen wäßrigen Lösung. von konzentrierter Salzsäure bei Räumtemperatur beizt, in Wasser abspült und auschließeud meiner Lösung, die 5o g wasszerf@eies Natriumcarbonat und I5g Natriumchromat in Iooo ccm Wasser enffilt, Io Minuten bei ewra 95' behaudelt. Derart behandelte Bleche wurden einem Korrosionsversuch in Wasserdampf bei 95° unterworfen. Während nach Io Tagen unbehandelte oder nur mit Säure gebeizte Vergleichsbleche schon eine starke Volumenvergrößerung durch interkristalline Korrosion, insbesondere an den Blechrändern, zeigten, waren die durch Beizen und Behandeln in alkalischer Chromatlösung mit einer Schutzschicht versehenen Bleche noch unverändert.As an example it should be mentioned that on an alloy with Io% aluminum and 0.5% copper, the remainder fine zinc, a solid, tightly adhering coating of gray color can be produced by, for example, sheets of this alloy for 2 minutes long in a 10% aqueous solution. of concentrated hydrochloric acid at room temperature pickled, rinsed in water and excluded from my solution, the 5o g of wasszerf @ egg Sodium carbonate and 15 g of sodium chromate in 100 cc of water enffilted for 10 minutes ewra 95 'asserts. Plates treated in this way were subjected to a corrosion test in steam subjected at 95 °. While after 10 days untreated or only pickled with acid Comparative sheets already show a strong increase in volume due to intergranular corrosion, especially at the sheet metal edges, they were caused by pickling and treatment in alkaline chromate solution with a protective layer of sheets still unchanged.
Es sei erwähnt, daß es auch bei einer Legierung, die o,8% Aluminium und o,4% Kupfer enthält, noch möglich ist, erfindungsgemäß festhaftende Schutzschichten zu erzeugen. Bei Legierungen mit weniger als o,5% Al wurden jedoch keine sichtbaren Schutzschichten mehr erbalten. Auf aluminiumfreiem Zink oder Zinklegerungen entstehen auch nach vorheriger Beizung in Säure keine sichtbaren Schutzschichten.It should be mentioned that there is also an alloy containing 0.8% aluminum and contains 0.4% copper, it is still possible, according to the invention, firmly adhering protective layers to create. In alloys with less than 0.5% Al, however, none were visible More protective layers are inherited. Formed on aluminum-free zinc or zinc layers no visible protective layers even after previous acid pickling.
Ferner sei erwähnt, daß zu der alkalisch,en Chromatlösung auch bei der Behandlung von Aluminium übliche Zusätze gegeben werden können.It should also be mentioned that the alkaline chromate solution also includes The usual additives can be added to the treatment of aluminum.
Das Beizen von Zinklegierungen in Säure ist an sich bekannt. Doch werden solche Beizungen. sonst nur zum Zwecke der Reinigung vorgenommen, um die Legierungen von Oxydschichten:, Schmutz o. dgl. zu befreien.The pickling of zinc alloys in acid is known per se. Indeed become such dressings. otherwise only made for the purpose of cleaning to the Alloys of oxide layers: to remove dirt or the like.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM148520D DE718601C (en) | 1940-08-29 | 1940-08-29 | Process for the surface treatment of zinc alloys containing aluminum |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM148520D DE718601C (en) | 1940-08-29 | 1940-08-29 | Process for the surface treatment of zinc alloys containing aluminum |
Publications (1)
Publication Number | Publication Date |
---|---|
DE718601C true DE718601C (en) | 1942-03-16 |
Family
ID=7336506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEM148520D Expired DE718601C (en) | 1940-08-29 | 1940-08-29 | Process for the surface treatment of zinc alloys containing aluminum |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE718601C (en) |
-
1940
- 1940-08-29 DE DEM148520D patent/DE718601C/en not_active Expired
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