EP0589028A1 - Konzentrat zur herstellung von metallbeizmitteln. - Google Patents
Konzentrat zur herstellung von metallbeizmitteln.Info
- Publication number
- EP0589028A1 EP0589028A1 EP93908942A EP93908942A EP0589028A1 EP 0589028 A1 EP0589028 A1 EP 0589028A1 EP 93908942 A EP93908942 A EP 93908942A EP 93908942 A EP93908942 A EP 93908942A EP 0589028 A1 EP0589028 A1 EP 0589028A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- acid
- compound
- concentrate
- 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.)
- Granted
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
Definitions
- the invention relates to a solid concentrate for the production of an acidic aqueous pickling agent for metal surfaces and its use in the form of portion packs for the production of a defined amount of pickling agent.
- metal surfaces e.g. made of steel and / or aluminum and their alloy
- unsightly and corrosion-demanding oxide layers such as those e.g. in the heat treatment of metals (welding) or caused by the influence of the environment.
- acid solutions for example based on hydrochloric acid, sulfuric acid, phosphoric acid or hydrofluoric acid.
- Acidic pastes can also be applied to the areas to be cleaned, especially for large parts or local oxide formation. This dissolves part of the oxides and the base metal attached to them, so that the oxides lose their adhesion to the metal surface. After an appropriate time, they are rinsed off with water or removed by brushing.
- Such a pickling or rust removal paste based on phosphoric acid contains e.g. as a thickener, saponifiable oil or a fatty acid that can be converted into soap (DE-AS 10 82 475).
- Another known cleaning and etching agent consists of hydrofluoric acid, a magnesium compound, at least one acid from the group of nitric acid, phosphoric acid and sulfuric acid in the form of free acid or in the form -2-
- pickling and rust removal pastes have been proposed which, in addition to fluoride ions, contain a mixture of compounds of calcium and trivalent iron and / or aluminum and have an acidity corresponding to at least 10% by weight of free acid (calculated as 100% HF) ( DE-OS 31 05 508).
- Such pickling pastes are primarily intended for the treatment of alloyed steels.
- the object of the invention is to take suitable measures for formulating pickling agents with which the known, in particular the aforementioned disadvantages are eliminated and which in particular solve the transport problem.
- the object is achieved by formulating the mordant as a solid concentrate, the components of which are solid, water- and / or acid-soluble
- magnesium compound or b2) calcium and / or aluminum compound and possibly
- solid agents suitable for the production of pickling baths for stainless steel and the like consist of soluble inorganic fluoride, soluble phosphate and optionally organic base and are added in such quantities of dilute nitric acid that pickling baths of a certain fluoride concentration are formed (DE- B-1546138).
- these are not solid pickling agent concentrates in the strict sense, i.e. concentrates that only need water as a solvent or dispersant. Because of the need to dissolve the solid agent in nitric acid, the problem of transporting aggressive liquids ultimately remains unsolved.
- the solid concentrate according to the invention does not contain any ineffective sorbents, and at most water is required as an auxiliary to prepare the mordant.
- the formulation of the concentrate components with a), bl) or b2) and optionally c) chosen above is intended to clarify that in addition to components a) and optionally c) either component bl) or component b2) is present. This does not rule out the fact that minor amounts of calcium and / or aluminum compound, or minor amounts of magnesium compound when component b2 is used, may be present in the mordant. If component b2 is present, calcium and aluminum compounds can of course be used together.
- the fluoride is introduced as an acid salt with component a), it simultaneously represents a compound in component c) which is acidic in water, so that a separate addition of a compound which is acidic in water may be unnecessary.
- the concentrate contains, in addition to a f bl or b2 and optionally c, as an additional component d) solid, water- and / or acid-soluble oxidizing agent.
- oxidizing agent content causes a higher aggressiveness of the pickling agent and thus an accelerated dissolution or detachment of rust and scale and possibly increases the metal removal.
- Another advantageous embodiment of the invention provides for the concentrate to be formulated with component bl.
- the use of magnesium compound leads to a better thickening in the preparation of the mordant than the use of component b2, ie than the use of calcium and / or aluminum compound.
- a concentrate is particularly advantageous
- the free acid content to be set depends essentially on the aim pursued by the pickling process. If removal or dissolution of thin layers of scale is required, contents of 3.5% by weight (calculated as HF) or slightly more are sufficient. However, if thick layers of scale are to be removed or a certain metal removal is intended, the free acid content should be at least 10% by weight HF. If the concentrate according to the invention contains solid, water- and / or acid-soluble oxidizing agent (component d) according to the aforementioned preferred embodiment, a dimensioning which leads to a content of 1 to 10% by weight in the concentrate is particularly advantageous. As a rule, when using weak oxidizing agents, the content is in the upper range, when using strong oxidizing agents in the lower range mentioned above.
- Further preferred embodiments of the invention consist of using permanganate and / or peroxide, in particular peroxydisulfate and / or carbamide peroxide, as component d). These substances are characterized by a particularly high effectiveness and also have the advantage of considerable resistance - even when mixed with the other components of the concentrate.
- the concentrate should be the component
- the individual components of the concentrate are mixed thoroughly. In order to prevent segregation of the individual components - especially during transport - it is advisable to use them with the same and expediently small particle size.
- the shelf life of the concentrate according to the invention depends essentially on the crystal water content of the components used. When using largely water-free components, it is at least one month.
- the shelf life can be increased considerably if, in accordance with a particular embodiment of the invention, the components containing water of crystallization and those free of water of crystallization are kept separate, i.e. only crystal water-containing and crystal water-free components are mixed with each other (if several substances of one type or another are used at all).
- a certain disadvantage of the aforementioned separation is, however, that two doses have to be carried out to produce the mordant.
- a special case of the present invention with separate keeping of only crystal water-free and only crystal water-containing components of the pickling agent, in which the crystal water-containing component has a relatively large amount of crystal water, consists in applying a pickling paste without additional use of water.
- one of the two components brings the amount of water required to form the pickling paste in a chemically bound form.
- a particularly advantageous, user-oriented embodiment of the invention which also eliminates the aforementioned disadvantage of the need for double dosing, consists in using the concentrate in the form of portion packs for the production of defined amounts of mordant.
- the packaged portions can be graduated to different sizes and can be used, for example, to produce 1, 2, 5 or 10 1 pickling agents. This applies equally to the case of the separation of concentrate components containing water of crystallization and water free of water of crystallization, in which case the contents of two packs in each case must be dissolved and / or dispersed in water.
- the concentrate is mixed with water, the amount of water depending in particular on the desired viscosity of the mordant and this in turn on the form of application, for example by spraying or brushing.
- the amount of water required to produce the mordant can be up to 60% by weight (based on the finished mordant).
- the pickling agent is expediently produced using a stirrer until homogeneous distribution. Depending on the amount of mordant to be produced and the mixing intensity of the stirrer, the required stirring times are between about 1 and 5 minutes.
- the pickling agent was produced from two separate solid substances I and II.
- Substance I consisted of ammonium hydrogen fluoride (NH.HF,)
- substance II consisted of a mixture of magnesium nitrate (Mg (N0 3 ) 2 «6H 2 0) and potassium nitrate (KN0 3 ) in a weight ratio of 2: 1.
- the pickling agent was again produced from two separate substances I and II.
- Substance I was a mixture of ammonium hydrogen fluoride (NH.HF «) and ammonium peroxydisulfate ((NH 4 ) -S_0 8 ) in a weight ratio of 3.5: 1, substance II one Mixture of magnesium nitrate (Mg (N0 _) _ «6H_0) and potassium nitrate (KN0_) in a weight ratio of 2: 1.
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)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4212891 | 1992-04-17 | ||
DE4212891A DE4212891A1 (de) | 1992-04-17 | 1992-04-17 | Konzentrat zur Herstellung von Metallbeizmitteln |
PCT/EP1993/000906 WO1993021362A2 (de) | 1992-04-17 | 1993-04-15 | Konzentrat zur herstellung von metallbeizmitteln |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0589028A1 true EP0589028A1 (de) | 1994-03-30 |
EP0589028B1 EP0589028B1 (de) | 1996-02-14 |
Family
ID=6457030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93908942A Expired - Lifetime EP0589028B1 (de) | 1992-04-17 | 1993-04-15 | Konzentrat zur herstellung von metallbeizmitteln |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0589028B1 (de) |
AU (1) | AU3953293A (de) |
DE (2) | DE4212891A1 (de) |
WO (1) | WO1993021362A2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6361613B2 (en) * | 1996-04-29 | 2002-03-26 | Ki Won Lee | Method for pickling mettalic surface, pickling solutions therefor, and process for regenerating spent pickling solutions |
AUPP762398A0 (en) * | 1998-12-09 | 1999-01-14 | Cairnscorp Technology Pty. Limited | Cleaning solutions containing citric acid and uses thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD248379A1 (de) * | 1986-04-22 | 1987-08-05 | Bitterfeld Chemie | Mittel zum sauren beizen von austenitischen edelstahloberflaechen |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5794578A (en) * | 1980-12-04 | 1982-06-12 | Taimu Chem:Kk | Acidic cleaner having viscosity |
DE3105508A1 (de) * | 1981-02-14 | 1982-09-02 | Metallgesellschaft Ag, 6000 Frankfurt | Beiz- und entrostungspaste fuer metalle |
DE3530132A1 (de) * | 1985-08-23 | 1987-02-26 | August Wittig | Oberflaechen beiz- und entrostungspaste zum reinigen von metalloberflaechen insbesondere aus edelstahl und/oder aluminium u. aluminiumlegierungen |
-
1992
- 1992-04-17 DE DE4212891A patent/DE4212891A1/de not_active Withdrawn
-
1993
- 1993-04-15 WO PCT/EP1993/000906 patent/WO1993021362A2/de active IP Right Grant
- 1993-04-15 EP EP93908942A patent/EP0589028B1/de not_active Expired - Lifetime
- 1993-04-15 AU AU39532/93A patent/AU3953293A/en not_active Abandoned
- 1993-04-15 DE DE59301633T patent/DE59301633D1/de not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD248379A1 (de) * | 1986-04-22 | 1987-08-05 | Bitterfeld Chemie | Mittel zum sauren beizen von austenitischen edelstahloberflaechen |
Non-Patent Citations (4)
Title |
---|
austenitic stainless steels.' Seite 260 ;Spalte 2 ; * |
CHEMICAL ABSTRACTS, vol. 108, no. 16, 18. April 1988, Columbus, Ohio, US; abstract no. 135900n, WIEDNER WOLGANG ET AL. 'acid pastes for pickling * |
CHEMICAL ABSTRACTS, vol. 108, no. 16, 18. April 1988, Columbus, Ohio, US; abstract no. 135900n, WIEDNER WOLGANG ET AL. 'acid pastes for pickling austenitic stainless steels.' Seite 260 ;Spalte 2 ; & DD-A-248379, 5 August 1987 * |
See also references of WO9321362A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO1993021362A3 (de) | 1994-03-03 |
EP0589028B1 (de) | 1996-02-14 |
WO1993021362A2 (de) | 1993-10-28 |
DE4212891A1 (de) | 1993-10-21 |
DE59301633D1 (de) | 1996-03-28 |
AU3953293A (en) | 1993-11-18 |
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