GB2038371A - Process for Surface-finishing Shaped Elements Consisting of Zinc or Zinc Alloys - Google Patents
Process for Surface-finishing Shaped Elements Consisting of Zinc or Zinc Alloys Download PDFInfo
- Publication number
- GB2038371A GB2038371A GB7849629A GB7849629A GB2038371A GB 2038371 A GB2038371 A GB 2038371A GB 7849629 A GB7849629 A GB 7849629A GB 7849629 A GB7849629 A GB 7849629A GB 2038371 A GB2038371 A GB 2038371A
- Authority
- GB
- United Kingdom
- Prior art keywords
- zinc
- volume
- shaped elements
- pickling
- shaped element
- 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
- 238000000034 method Methods 0.000 title claims abstract description 35
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 24
- 239000011701 zinc Substances 0.000 title claims abstract description 24
- 229910001297 Zn alloy Inorganic materials 0.000 title claims abstract description 18
- 238000005554 pickling Methods 0.000 claims abstract description 20
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 7
- 239000001117 sulphuric acid Substances 0.000 claims abstract description 7
- 235000011149 sulphuric acid Nutrition 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000004532 chromating Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- XUDNJARNPKNDSJ-UHFFFAOYSA-N [Ti].[Cu].[Zn] Chemical compound [Ti].[Cu].[Zn] XUDNJARNPKNDSJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 2
- ABXXWVKOBZHNNF-UHFFFAOYSA-N chromium(3+);dioxido(dioxo)chromium Chemical compound [Cr+3].[Cr+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O ABXXWVKOBZHNNF-UHFFFAOYSA-N 0.000 claims description 2
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000005238 degreasing Methods 0.000 claims description 2
- 238000009713 electroplating Methods 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 150000007522 mineralic acids Chemical class 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- UOURRHZRLGCVDA-UHFFFAOYSA-D pentazinc;dicarbonate;hexahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[O-]C([O-])=O.[O-]C([O-])=O UOURRHZRLGCVDA-UHFFFAOYSA-D 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 231100000719 pollutant Toxicity 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 claims description 2
- 239000011253 protective coating Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000011265 semifinished product Substances 0.000 claims description 2
- 235000010269 sulphur dioxide Nutrition 0.000 claims description 2
- 239000004291 sulphur dioxide Substances 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
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
- 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
- C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/53—Treatment of zinc or alloys based thereon
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)
- Chemical Treatment Of Metals (AREA)
- Electroplating Methods And Accessories (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
A process is described for surface-finishing shaped elements consisting of zinc or zinc alloys, particularly of sheets and strips made by rolling, by pickling the shaped elements in a solution which contains 60 to 90% by volume of water and 10 to 40% by volume of nitric acid, and which may contain up to 10% by volume of sulphuric acid. The elements are thus preweathered and the colour may be varied by the speed at which the elements are moved through the pickling solution.
Description
SPECIFICATION
Process for Surface-finishing Shaped Elements
Consisting of Zinc or Zinc Alloys
This invention relates to a process for surfacefinishing shaped elements consisting of zinc or zinc alloys, particularly elements in the form of sheets and strip made by rolling.
Under normal atmospheric conditions, protective coatings of basic zinc carbonate are formed on the surfaces of shaped elements consisting of zinc or zinc alloys, the formation of these coatings taking about three days in an atmosphere having a relative humidity of 75%.
Depending upon the composition of the alloy, the location, the atmosphere and the time, these coatings are light-grey to dark-grey in colour. The formation of these coatings can be retarded or prevented by pollutants, such as sulphur dioxide, contained in the air.
For this reason a surface-finishing treatment is often required for improving the appearance of the shaped elements. Such a treatment also provides technological advantages because a more uniform coating can be formed. The surfacefinishing treatment may be conducted so as to obtain a uniform colour, which is often highly desirable for improved appearance.
Zinc can be chemically passivated by electroplating as well as by chromating and phosphating processes, which are used on a relatively large scale. In a chromating process, the surfaces which have been cleaned and pretreated are treated with dilute chromic acid or chromate solutions.
Inorganic acids or salts may be added to said solutions in certain proportions in order to obtain certain hues or to control the thickness of the coatings. The surfaces treated in this manner have hues from pale yellow to olive-brown and the covering layer which consists of chromium hydroxide and basic chromium (III) chromate, has a thickness from less than 1 micron to about 5 microns.
Phosphating can be effected by pickling with phosphoric acid or by film-forming phosphating processes after a suitable pretreatment, the phosphate coatings usually having a thickness of from 2 to 1 5 microns.
These passivating processes involve a relatively large number of steps and, for this reason, are expensive. They also have the disadvantage that the chromated or phosphated semifinished products must be pretreated before they can be soldered. For this reason the use of zinc sheets in construction work is rather difficult.
According to the present invention there is provided a process for surface-finishing a shaped element consisting of zinc or a zinc alloy, wherein the shaped element is pickled in a solution which contains 60 to 90% by volume of water and 10 to 40% by volume of nitric acid. This process enables the surfaces of shaped elements consisting of zinc or zinc alloys, particularly of strip and sheets made by rolling, to be preweathered. The invention also resides in the shaped elements surface-finished by this process.
The pickling process can be accelerated and the colour can be influenced by an addition of up to 10% by volume of sulphuric acid to the pickling solution.
Depending upon the desired colour, the shaped element may be moved through the pickling solution at a speed of 0.5 to 50 metres per minute, preferably 0.5 to 30 metres per minute.
Any foreign matter on the shaped elements which are to be pickled must be removed by degreasing and possibly by rinsing and brushing, prior to the pickling treatment.
In order to enable the invention to be more readily understood, an example thereof will now be described.
In this Example of the present process, a rolled strip having a thickness of 0.72 mm. and composed of a zinc-copper-titanium alloy consisting of 0.14% by weight of copper, 0. 13% by weight of titanium, 0.01% by weight of aluminium, balance high-grade zinc, was pulled at a speed of 8 metres per minute through a pickling bath consisting of 85% by volume of water, 10% by volume of nitric acid and 5% by volume of sulphuric acid and was subsequently rinsed, brushed and dried. After this pickling treatment, the surface of the strip had a dark grey to black colour.
An advantage of the present invention is that shaped elements consisting of zinc or zinc alloys can be preweathered in a relatively simple manner and it is no longer necessary to wait until a prolonged action of atmospheric influences has resulted in a light grey to dark grey colour of the surface. This advantage is particularly significant in view of the desire that sheet metal elements, e.g. those used in construction, should have a uniform colour for the sake of appearance. The preweathered surface can also act as a key for a subsequently applied paint so that no primer is required in this case. Another important advantage is that the preweathered shaped elements can be soldered with entirely conventional means.
Claims
1. A process for surface-finishing a shaped element consisting of zinc or a zinc alloy, wherein the shaped element is pickled in a solution which contains 60 to 90% by volume of water and 10 to 40% by volume of nitric acid.
2. A process as claimed in claim 1, wherein the solution also contains up to 10% by volume of sulphuric acid.
3. A process as claimed in claim 1 or claim 2, wherein the shaped element is moved through the pickling solution at a speed of 0.5 to 50 metres per minute.
4. A process as claimed in any one of claims 1 to 3, wherein the shaped element is moved through the pickling solution at a speed of 0.5 to
30 metres per minute.
5. A process for surface-finishing a shaped element consisting of zinc or a zinc alloy
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A process for surface-finishing a shaped element consisting of zinc or a zinc alloy, wherein the shaped element is pickled in a solution which contains 60 to 90% by volume of water and 10 to 40% by volume of nitric acid.
2. A process as claimed in claim 1, wherein the solution also contains up to 10% by volume of sulphuric acid.
3. A process as claimed in claim 1 or claim 2, wherein the shaped element is moved through the pickling solution at a speed of 0.5 to 50 metres per minute.
4. A process as claimed in any one of claims 1 to 3, wherein the shaped element is moved through the pickling solution at a speed of 0.5 to
30 metres per minute.
5. A process for surface-finishing a shaped element consisting of zinc or a zinc alloy substantially as herein before described in the foregoing Example.
6. A shaped element surface-finished by the process claimed in any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2757592A DE2757592C2 (en) | 1977-12-23 | 1977-12-23 | Process for the production of cover layers on molded bodies made of zinc-copper-titanium alloys |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2038371A true GB2038371A (en) | 1980-07-23 |
| GB2038371B GB2038371B (en) | 1982-07-14 |
Family
ID=6027048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7849629A Expired GB2038371B (en) | 1977-12-23 | 1978-12-21 | Process for surface-finishing shaped elements consisting of zinc or zinc alloys |
Country Status (10)
| Country | Link |
|---|---|
| BE (1) | BE872979A (en) |
| CH (1) | CH642111A5 (en) |
| DE (1) | DE2757592C2 (en) |
| DK (1) | DK155530C (en) |
| FR (1) | FR2412622A1 (en) |
| GB (1) | GB2038371B (en) |
| IE (1) | IE47623B1 (en) |
| IT (1) | IT1101329B (en) |
| LU (1) | LU80710A1 (en) |
| NL (1) | NL175079C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831661A (en) * | 2010-04-01 | 2010-09-15 | 中国科学院宁波材料技术与工程研究所 | Zinc alloy acid-washing solution and zinc alloy acid-washing treating process |
| WO2015063274A1 (en) * | 2013-10-31 | 2015-05-07 | Umicore Building Products France | Patterned rolled zinc alloy sheet |
| CN112708896A (en) * | 2020-11-24 | 2021-04-27 | 清远先导材料有限公司 | Pickling process of ultra-pure zinc block |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19636370B4 (en) * | 1996-09-09 | 2005-04-14 | Rheinzink Gmbh | Process for the production of protective coatings on flat products of titanium zinc and flat products |
| DE19905134A1 (en) * | 1999-02-09 | 2000-09-28 | Hillebrand Walter Gmbh & Co Kg | Passivation process |
| DE10156475A1 (en) * | 2001-11-16 | 2003-06-05 | Rheinzink Gmbh | Process for the production of dark protective layers on flat products made of titanium zinc |
| US7611588B2 (en) | 2004-11-30 | 2009-11-03 | Ecolab Inc. | Methods and compositions for removing metal oxides |
| DE102010025707A1 (en) | 2010-06-30 | 2012-01-05 | Rheinzink Gmbh & Co. Kg | Process for the preparation of protective coatings on flat titanium zinc products |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2559878A (en) * | 1948-12-29 | 1951-07-10 | Western Electric Co | Zinc and cadmium passivating bath |
| US2904413A (en) * | 1954-06-23 | 1959-09-15 | Jervis Corp | Process of bright dipping zinc base alloys |
| US2884350A (en) * | 1955-12-28 | 1959-04-28 | Sylvania Electric Prod | Solderable zinc alloy coating |
| US3524817A (en) * | 1966-11-02 | 1970-08-18 | Macdermid Inc | Method and compositions for chemically polishing zinc |
| JPS4926422A (en) * | 1972-07-12 | 1974-03-08 |
-
1977
- 1977-12-23 DE DE2757592A patent/DE2757592C2/en not_active Expired
-
1978
- 1978-11-24 NL NLAANVRAGE7811555,A patent/NL175079C/en not_active IP Right Cessation
- 1978-12-12 FR FR7834905A patent/FR2412622A1/en active Granted
- 1978-12-21 IT IT31109/78A patent/IT1101329B/en active
- 1978-12-21 CH CH1304278A patent/CH642111A5/en not_active IP Right Cessation
- 1978-12-21 IE IE2551/78A patent/IE47623B1/en unknown
- 1978-12-21 BE BE6046709A patent/BE872979A/en not_active IP Right Cessation
- 1978-12-21 GB GB7849629A patent/GB2038371B/en not_active Expired
- 1978-12-22 DK DK579178A patent/DK155530C/en not_active IP Right Cessation
- 1978-12-22 LU LU80710A patent/LU80710A1/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831661A (en) * | 2010-04-01 | 2010-09-15 | 中国科学院宁波材料技术与工程研究所 | Zinc alloy acid-washing solution and zinc alloy acid-washing treating process |
| WO2015063274A1 (en) * | 2013-10-31 | 2015-05-07 | Umicore Building Products France | Patterned rolled zinc alloy sheet |
| US10494812B2 (en) | 2013-10-31 | 2019-12-03 | Umicore Building Products France | Patterned rolled zinc alloy sheet |
| CN112708896A (en) * | 2020-11-24 | 2021-04-27 | 清远先导材料有限公司 | Pickling process of ultra-pure zinc block |
Also Published As
| Publication number | Publication date |
|---|---|
| CH642111A5 (en) | 1984-03-30 |
| NL175079C (en) | 1984-09-17 |
| IT7831109A0 (en) | 1978-12-21 |
| NL175079B (en) | 1984-04-16 |
| IE47623B1 (en) | 1984-05-02 |
| DK579178A (en) | 1979-06-24 |
| FR2412622A1 (en) | 1979-07-20 |
| IE782551L (en) | 1979-06-23 |
| LU80710A1 (en) | 1979-04-13 |
| BE872979A (en) | 1979-06-21 |
| DE2757592C2 (en) | 1985-03-28 |
| IT1101329B (en) | 1985-09-28 |
| DK155530B (en) | 1989-04-17 |
| FR2412622B1 (en) | 1983-09-23 |
| DK155530C (en) | 1989-09-04 |
| NL7811555A (en) | 1979-06-26 |
| GB2038371B (en) | 1982-07-14 |
| DE2757592A1 (en) | 1979-07-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19971221 |