EP2430206A1 - Modification of the composition of the flux solution for hot-dip batch galvanizing of steel parts - Google Patents
Modification of the composition of the flux solution for hot-dip batch galvanizing of steel partsInfo
- Publication number
- EP2430206A1 EP2430206A1 EP10711936A EP10711936A EP2430206A1 EP 2430206 A1 EP2430206 A1 EP 2430206A1 EP 10711936 A EP10711936 A EP 10711936A EP 10711936 A EP10711936 A EP 10711936A EP 2430206 A1 EP2430206 A1 EP 2430206A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steels
- flux solution
- galvanizing
- improved according
- hot
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 230000004907 flux Effects 0.000 title claims abstract description 17
- 238000005246 galvanizing Methods 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 title description 6
- 230000004048 modification Effects 0.000 title description 3
- 238000012986 modification Methods 0.000 title description 3
- 238000000034 method Methods 0.000 claims abstract description 11
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011592 zinc chloride Substances 0.000 claims abstract description 5
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000007654 immersion Methods 0.000 claims description 11
- 239000011701 zinc Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000008399 tap water Substances 0.000 claims description 6
- 235000020679 tap water Nutrition 0.000 claims description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- JHXKRIRFYBPWGE-UHFFFAOYSA-K bismuth chloride Chemical compound Cl[Bi](Cl)Cl JHXKRIRFYBPWGE-UHFFFAOYSA-K 0.000 claims description 2
- 150000001805 chlorine compounds Chemical class 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 17
- 238000000576 coating method Methods 0.000 abstract description 11
- 238000005554 pickling Methods 0.000 abstract description 5
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 229910000975 Carbon steel Inorganic materials 0.000 abstract 1
- 235000005074 zinc chloride Nutrition 0.000 abstract 1
- 238000007792 addition Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 7
- 230000009257 reactivity Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000001464 adherent effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 208000035967 Long Term Adverse Effects Diseases 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/30—Fluxes or coverings on molten baths
Definitions
- the present invention has as object the improvement of the surface preparation of pre-fabricated steel parts to be hot-dip galvanized and more specifically it refers to the influence of the flux solution composition on the coating quality obtained in batch galvanizing processes where molten Zinc baths containing up to 0,1 wt% Al are used.
- Steels that my be galvanized include those so-called: reactive. Steels reactivity depends on a critical concentration of Si and P in the steel (Sandelin effect) which may vary not only among the steels but also in the same steel where they may be unevenly distributed. Coatings obtained with reactive steels are gray and dull, the interface with the steel is fragile, the thickness of the coating is high causing excessive Zinc consumption and therefore an economical damage.
- the fragile interface contains Zn-Fe phases that may reach the outer surface of the coating which due to its fragility may flake after a mechanical deformation.
- the flux solution which traditionally contains a mixture of salts among which ZnC12 is, according to its concentration, a potential source of danger for the environment and thus must be carefully monitored.
- the present invention aims at contributing to the solution of potential problems arising from the presence of ZnC12 in the galvanizing shop, by means of a procedure for the preparation of surface of pre-fabricated steel pieces to be hot-dip galvanized in a Zn-Al-alloy, according to which the concentration of ZnC12 into the flux solution is maintained below the limit prescribed by the law and preferably down to zero.
- the steel pieces, after pickling are immersed into an aqueous solution containing: 0-50 g/L Of ZnCl 2 , preferably 0-25, and more preferably 0-10, 20-300 g/L OfNH 4 Cl, 0.1-1 g/L Of Bi 2 O 3 , at a pH ranging from 0.1 e 1.5, preferably between 0.5 e 1, maintained in the optimum interval by means of HCl 0. IN or KOH 0. IN additions; pieces are immersed in the flux solution at a temperature between 4 and 50 0 C, preferably between 10 and 30 0 C and more preferably between 15 and
- the salts from the flux solution remain adherent to the steel pieces and have a fusion temperature well below the temperature of the molten galvanizing bath and are therefore easily eliminated upon immersion forming ashes and dross.
- Mn, and/or P i.e. steels commercially known as Sandelin or Iper-sandelin steels
- the flux solution according to the present invention obtaining coating with uniform thickness, with no surface defects and with a smooth surface without non-homogeneous areas.
- Table 1 contains the symbols with which the surface quality of coatings was assessed according its coating homogeneity & continuity, uniformity of the colour. Table 1.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITAL2009A000002A IT1392855B1 (en) | 2009-02-19 | 2009-02-19 | NEW FORMULATION OF FLUSHING SOLUTION IN GENERAL STEEL HOT GALVANIZING PROCESSES |
PCT/IT2010/000052 WO2010095154A1 (en) | 2009-02-19 | 2010-02-17 | Modification of the composition of the flux solution for hot-dip batch galvanizing of steel parts |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2430206A1 true EP2430206A1 (en) | 2012-03-21 |
EP2430206B1 EP2430206B1 (en) | 2013-07-03 |
Family
ID=41055106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10711936.4A Active EP2430206B1 (en) | 2009-02-19 | 2010-02-17 | Modification of the composition of the flux solution for hot-dip batch galvanizing of steel parts |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2430206B1 (en) |
IT (1) | IT1392855B1 (en) |
WO (1) | WO2010095154A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115323304A (en) * | 2022-08-30 | 2022-11-11 | 重庆广仁铁塔制造有限公司 | Hot galvanizing method for low-silicon active steel |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2646303C2 (en) * | 2016-07-12 | 2018-03-02 | Акционерное общество "Уралэлектромедь" | Flux for hot galvanizing of steel products |
DE102021111089A1 (en) | 2021-04-29 | 2022-11-03 | Seppeler Holding Und Verwaltungs Gmbh & Co. Kg | Process, system and use of these in batch galvanizing |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060228482A1 (en) * | 2005-04-07 | 2006-10-12 | International Lead Zinc Research Organization, Inc. | Zinc-aluminum alloy coating of metal objects |
US7811389B2 (en) * | 2005-12-20 | 2010-10-12 | Teck Metals Ltd. | Flux and process for hot dip galvanization |
AU2007258462A1 (en) * | 2006-06-09 | 2007-12-21 | Teck Cominco Metals Ltd. | High-aluminum alloy for general galvanizing |
-
2009
- 2009-02-19 IT ITAL2009A000002A patent/IT1392855B1/en active
-
2010
- 2010-02-17 EP EP10711936.4A patent/EP2430206B1/en active Active
- 2010-02-17 WO PCT/IT2010/000052 patent/WO2010095154A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010095154A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115323304A (en) * | 2022-08-30 | 2022-11-11 | 重庆广仁铁塔制造有限公司 | Hot galvanizing method for low-silicon active steel |
CN115323304B (en) * | 2022-08-30 | 2024-02-09 | 重庆广仁能源装备股份有限公司 | Hot galvanizing method for low-silicon active steel |
Also Published As
Publication number | Publication date |
---|---|
ITAL20090002A1 (en) | 2010-08-20 |
IT1392855B1 (en) | 2012-04-02 |
WO2010095154A1 (en) | 2010-08-26 |
EP2430206B1 (en) | 2013-07-03 |
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