DE3418620C2 - Preparations for chemical polishing of brass - Google Patents
Preparations for chemical polishing of brassInfo
- Publication number
- DE3418620C2 DE3418620C2 DE19843418620 DE3418620A DE3418620C2 DE 3418620 C2 DE3418620 C2 DE 3418620C2 DE 19843418620 DE19843418620 DE 19843418620 DE 3418620 A DE3418620 A DE 3418620A DE 3418620 C2 DE3418620 C2 DE 3418620C2
- Authority
- DE
- Germany
- Prior art keywords
- weight
- brass
- chemical polishing
- sulfuric acid
- ammonium nitrate
- 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
- 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
- C23F3/04—Heavy metals
- C23F3/06—Heavy metals with acidic solutions
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Das erfindungsgemäße Mittel zum chemischen Polieren von Messing in Form einer wäßrigen Lösung enthält 45-65 Gew.-% Schwefelsäure 0,05-4,9 Gew.-% Ammoniumnitrat 0,05-1,0 Gew.-% Harnstoff 0,02-0,3 Gew.-% Ammoniumchlorid.The agent according to the invention for chemical polishing of brass in the form of an aqueous solution contains 45-65% by weight sulfuric acid 0.05-4.9% by weight ammonium nitrate 0.05-1.0% by weight urea 0.02- 0.3 wt% ammonium chloride.
Description
enthältcontains
Gegenstand der vorliegenden Erfindung ist ein Mittel zum chemischen Polieren von Messing in Form einer wäßrigen. Schwefelsäure und Ammoniumnitrat enthaltenden Lösung.The present invention relates to an agent for chemical polishing of brass in the form of an aqueous. Containing sulfuric acid and ammonium nitrate Solution.
Das gebräuchlichste Mittel zum chemischen Polieren von Messing ist konzentrierte Salpetersäure oder eine Lösung dieser Säure mit Additiven von anorganischen oder organischen Säuren zusammen mit verschiedenen Salzen und Metalloxiden. Die Anwendung dieser Lösungen ist trotz guter Poliereigenschaften beschränkt, da während der chemischen Behandlung stark toxische Gase, wie Stickoxide, auftreten. Dies stellt eine Gefährdung der Gesundheit des Personals und eine Verunreinigung der Atmosphäre dar.The most common means of chemical polishing brass is concentrated nitric acid or a Solution of this acid with additives of inorganic or organic acids along with various Salts and metal oxides. The use of these solutions is limited despite their good polishing properties, as highly toxic gases such as nitrogen oxides are generated during the chemical treatment. This poses a hazard the health of the staff and a pollution of the atmosphere.
Bekannt ist weiterhin ein Mittel zum chemischen Policen von Kupferlegierungen, insbesondere von Messing, das konzentrierte Schwefelsäure (35—45 Gew.%), konzentrierte Salpetersäure (15—40 Gew.%), Ammoniumnitrat (10-30 Gew.%), Kadmiumchlorid (0,05—5,0 Gew.%), Natrium-, Kalium- oder Ammoniumphosphat (2-15 Gew.%) und Wasser (1-30 Gew.%) enthält Dieses Mittel findet überwiegend Anwendung beim Polieren von Messing mit niedrigen oder mittleren Kupferanteilen mit bis zu 63 Gew.% Kupfer. Die chemische Behandlung von Messing mit hohem Kupfergehalt führt nur zu unbefriedigenden Ergebnissen.Also known is a means for chemical policies of copper alloys, in particular brass, concentrated sulfuric acid (35-45% by weight), concentrated nitric acid (15-40% by weight), ammonium nitrate (10-30% by weight), cadmium chloride (0.05-5.0% by weight), sodium, potassium or ammonium phosphate (2-15 wt.%) And water (1-30 wt.%) This agent is mainly used for polishing of brass with low or medium copper contents with up to 63 wt.% copper. The chemical Treating brass with a high copper content will only give unsatisfactory results.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Mittel zum Polieren von Messing zu schaffen, das die oben geschilderten Nachteile vermeidet, insbesondere ein Arbeiten frei von Stickoxiden ermöglicht.The invention is therefore based on the object to provide a means for polishing brass that the Avoids the disadvantages outlined above, in particular enables working free of nitrogen oxides.
Diese Aufgabe wird durch ein Mittel zum chemischen Polieren von Messing in Form einer wäßrigen Schwefelsäure enthaltenden Lösung, dieThis task is accomplished by a means for chemical polishing of brass in the form of an aqueous sulfuric acid containing solution that
Schwefelsäure
Ammoniumnitrat
Harnstoff
Ammoniumchloridsulfuric acid
Ammonium nitrate
urea
Ammonium chloride
45-65 Gew.%
0,05-4,0 Gew.%
0,05-1,0 Gew.%
0.02-03 Gew.% Gepreßte und ausgeglühte, mit einer Zunderschicht
bedeckte Messingformkörper mit 70 Gew.% Kupfer wurden bei einer Temperatur von 398° K 70 Sekunden
lang mit nachstendem Mittel poliert:45-65% by weight
0.05-4.0% by weight
0.05-1.0% by weight
0.02-03 wt.% Pressed and annealed brass molded bodies covered with a layer of scale and containing 70 wt.% Copper were polished at a temperature of 398 ° K for 70 seconds with the following agent:
10 Gew.% Gew.% 0,8 Gew.% 0,2 Gew.% Gew.%10% by weight% by weight 0.8% by weight 0.2% by weight% by weight
Harnstoffurea
Wasserwater
Weitere beispielhafte Zusammensetzungen sind nachstehend aufgeführt:Further exemplary compositions are listed below:
1515th
2020th
25 Gew.% Gew.% Gew.% 0,05 Gew.%25% by weight% by weight% by weight 0.05% by weight
48,95 Gew.%48.95% by weight
Gew.% Gew.% 0,08 Gew.% 0,15 Gew.%% By weight% by weight 0.08% by weight 0.15% by weight
31,77 Gew.%31.77% by weight
Harnstoffurea
Wasserwater
Harnstoffurea
Wasserwater
Die polierten Flächen waren fehlerfrei. Während der Behandlung wurde keine Bildung toxischer Gase, wie Stickoxide oder Schwefeldioxide beobachtetThe polished surfaces were free of defects. During the treatment there was no formation of toxic gases, such as Nitrogen oxides or sulfur dioxide observed
3030th
3535
4040
4545
5050
5555
enthält, gelöst.contains, solved.
Ein Vorteil des erfindungsgemäßen Mittels besteht darin, daß Emissionen von Stickoxiden beim Polieren vermieden werden und ein weiterer darin, daß billige Methoden der Abwasserneutralisation angewendet werden können, da dieses vorwiegend Kupfer- und Zinksulfate enthält.An advantage of the agent according to the invention is that emissions of nitrogen oxides during polishing can be avoided and another is that cheap methods of wastewater neutralization are used because it contains mainly copper and zinc sulphates.
Das erfindungsgemäße Mittel findet vor allem Anwendung bei Produkten, die mit einer Schicht von Oxiden überdeckt sind und frei von anderen Verunreinigungen, wie Fetten und Schmierstoffen sind.The agent according to the invention is mainly used for products that are covered with a layer of oxides and free of other impurities, how fats and lubricants are.
Claims (1)
Ammoniumnitrat
Harnstoff
Ammoniumchloridsulfuric acid
Ammonium nitrate
urea
Ammonium chloride
0,05-4,0 Gew.%
0,05-1,0 Gew.%
0,02—03 Gew.%45-65% by weight
0.05-4.0% by weight
0.05-1.0% by weight
0.02-03% by weight
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL24204983A PL137973B1 (en) | 1983-05-19 | 1983-05-19 | Agent for chemically polishing brasses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3418620A1 DE3418620A1 (en) | 1984-11-22 |
| DE3418620C2 true DE3418620C2 (en) | 1986-04-24 |
Family
ID=20017101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19843418620 Expired DE3418620C2 (en) | 1983-05-19 | 1984-05-18 | Preparations for chemical polishing of brass |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3418620C2 (en) |
| GB (1) | GB2140038B (en) |
| PL (1) | PL137973B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2582675B1 (en) * | 1985-06-03 | 1992-10-02 | Solvay | BATHS AND METHODS FOR CHEMICAL POLISHING OF STAINLESS STEEL SURFACES |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB478209A (en) * | 1935-07-25 | 1938-01-13 | Max Landauer | Improvements in connection with the removal of scale-like deposits from vessels madeof aluminium or aluminium alloys |
-
1983
- 1983-05-19 PL PL24204983A patent/PL137973B1/en unknown
-
1984
- 1984-05-16 GB GB08412496A patent/GB2140038B/en not_active Expired
- 1984-05-18 DE DE19843418620 patent/DE3418620C2/en not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| NICHTS-ERMITTELT |
Also Published As
| Publication number | Publication date |
|---|---|
| PL242049A1 (en) | 1984-12-03 |
| GB2140038B (en) | 1986-09-10 |
| PL137973B1 (en) | 1986-08-30 |
| GB2140038A (en) | 1984-11-21 |
| DE3418620A1 (en) | 1984-11-22 |
| GB8412496D0 (en) | 1984-06-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |