DE59107828D1 - Process for pickling workpieces from high-alloy materials and device for carrying out the process - Google Patents
Process for pickling workpieces from high-alloy materials and device for carrying out the processInfo
- Publication number
- DE59107828D1 DE59107828D1 DE59107828T DE59107828T DE59107828D1 DE 59107828 D1 DE59107828 D1 DE 59107828D1 DE 59107828 T DE59107828 T DE 59107828T DE 59107828 T DE59107828 T DE 59107828T DE 59107828 D1 DE59107828 D1 DE 59107828D1
- Authority
- DE
- Germany
- Prior art keywords
- acid
- threshold value
- mixed
- workpieces
- specified threshold
- 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 - Fee Related
Links
- 238000000034 method Methods 0.000 title abstract 4
- 238000005554 pickling Methods 0.000 title abstract 3
- 239000000956 alloy Substances 0.000 title abstract 2
- 239000002253 acid Substances 0.000 abstract 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 abstract 2
- 239000007795 chemical reaction product Substances 0.000 abstract 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 abstract 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 229910017604 nitric acid Inorganic materials 0.000 abstract 1
- 238000004886 process control Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 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
- 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
- C23G1/10—Other heavy metals
-
- 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
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)
Abstract
The invention relates to a process and a device for pickling workpieces of high-alloy materials in which the workpieces are immersed in a mixed-acid bath, or passed through a mixed-acid bath, consisting of nitric acid, hydrofluoric acid and water with amidosulphonic acid (NH2) HSO3 added as NOx acceptor. The invention is characterised in that the vaporous reaction products produced during pickling and containing nitrogen oxide components (NO, NO2) are sucked off in a known manner together with the room air in the intake region, the NOx component is continuously measured directly in the region in which the reaction products are produced and, if a specified threshold value for the NOx component is exceeded, a quantity of amidosulphonic acid in liquid form is added in excess to the mixed acid by the process control system and this procedure is repeated either if the specified threshold value is again exceeded or if at a specified time after completing the addition, the value actually measured for the NOx component is still above the specified threshold value. <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4008567 | 1990-03-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE59107828D1 true DE59107828D1 (en) | 1996-06-27 |
Family
ID=6402418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE59107828T Expired - Fee Related DE59107828D1 (en) | 1990-03-14 | 1991-03-12 | Process for pickling workpieces from high-alloy materials and device for carrying out the process |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0448189B1 (en) |
| AT (1) | ATE138423T1 (en) |
| DE (1) | DE59107828D1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1621608A1 (en) * | 1967-01-31 | 1971-06-03 | Kunststofftechnik Gmbh U Co Ve | Method of trapping nitrogen oxides |
| JPS5782480A (en) * | 1980-11-10 | 1982-05-22 | Nissan Chem Ind Ltd | Nitric acid pickling solution for metal |
| DE3412329A1 (en) * | 1984-04-03 | 1985-10-10 | Maschinenfabrik Andritz Ag, Graz | Process for pickling alloy steels, copper, non-ferrous metal alloys, special alloys, titanium, zirconium, tantalum etc. by means of nitric-acid pickling baths |
| EP0259533A1 (en) * | 1986-09-11 | 1988-03-16 | Eka Nobel Aktiebolag | Method of reducing the emission of nitrogen oxides from a liquid containing nitric acid |
-
1991
- 1991-03-12 DE DE59107828T patent/DE59107828D1/en not_active Expired - Fee Related
- 1991-03-12 AT AT91250067T patent/ATE138423T1/en not_active IP Right Cessation
- 1991-03-12 EP EP91250067A patent/EP0448189B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0448189A2 (en) | 1991-09-25 |
| EP0448189B1 (en) | 1996-05-22 |
| ATE138423T1 (en) | 1996-06-15 |
| EP0448189A3 (en) | 1993-07-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8364 | No opposition during term of opposition | ||
| 8327 | Change in the person/name/address of the patent owner |
Owner name: MANNESMANNROEHREN-WERKE AG, 45473 MUELHEIM, DE |
|
| 8339 | Ceased/non-payment of the annual fee |