EP1368515A2 - Procede de passivation d'une bande d'acier inoxydable etame au moyen d'un film de passivation sans chrome - Google Patents

Procede de passivation d'une bande d'acier inoxydable etame au moyen d'un film de passivation sans chrome

Info

Publication number
EP1368515A2
EP1368515A2 EP01994948A EP01994948A EP1368515A2 EP 1368515 A2 EP1368515 A2 EP 1368515A2 EP 01994948 A EP01994948 A EP 01994948A EP 01994948 A EP01994948 A EP 01994948A EP 1368515 A2 EP1368515 A2 EP 1368515A2
Authority
EP
European Patent Office
Prior art keywords
passivation
chrome
stainless steel
tinned
steel strip
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.)
Withdrawn
Application number
EP01994948A
Other languages
German (de)
English (en)
Inventor
Norma Ctro Sviluppo Materiali SpA DE CRISTOFARO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centro Sviluppo Materiali SpA
Original Assignee
Centro Sviluppo Materiali SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Centro Sviluppo Materiali SpA filed Critical Centro Sviluppo Materiali SpA
Publication of EP1368515A2 publication Critical patent/EP1368515A2/fr
Withdrawn legal-status Critical Current

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
    • 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
    • C23C22/40—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 containing molybdates, tungstates or vanadates
    • 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
    • C23C22/34—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 containing fluorides or complex fluorides
    • 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
    • C23C22/46—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 containing oxalates
    • 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
    • C23C22/58—Treatment of other metallic material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • C25D9/10—Electrolytic coating other than with metals with inorganic materials by cathodic processes on iron or steel

Definitions

  • the present invention relates to the field of the treatments for the passivation of tinned stainless steel strip with a Chrome-free passivation film, in order to improve the environmental impact of the related technologies .
  • coated steels prior to the end use thereof, should be passivated when employed tel quel, or be subjected to a surface treatment in order to improve the adhesion of optional coatings or some performances, like, e.g., the corrosion resistance.
  • the passivation coating may be construed as a mixture of corrosion products of the metallic substrate and of various reduced species deriving from the conversion bath.
  • Typical examples of passivation treatment are chromate/phosphate-based systems, accounting for a considerable share of the market of surface conversion processes and products.
  • the main passivation techniques provide the mere dipping of the product to be passivated, or the applying of a cathode current, often allowing more rapid forming times, thereto.
  • the tinned stainless steel strip is, e.g., conventionally passivated with Chrome salt (Sodium dichromate, Na 2 Cr 2 0 7 ) -based solutions.
  • Chrome salt Sodium dichromate, Na 2 Cr 2 0 7
  • Chrome-based passivation with other likewise effective passivations based on Chrome-free solutions.
  • the present invention meets this demand.
  • an object of the present invention is a process for the passivation of tinned stainless steel strip with a Chrome-free passivation film, characterised in that it comprises the step of dipping, optionally applying a cathode current, the tinned strip in a passivation bath comprising at least one salt of a transition metal selected from Cobalt, Titanium, Zirconium and Molybdenum.
  • the passivation bath is an aqueous solution of Cobalt sulfate heptahydrate (CoS0 • 7H 2 0) , Potassium Titanium fluoride (K 2 TiF 6 ) and Sodium nitrate (NaN0 3 ) .
  • the process features are as follows: passivation bath composition expressed in g/1
  • the passivation bath is an aqueous solution of Potassium Titanium fluoride (K 2 TiF 6 ) and Sodium nitrate (NaN0 3 ) .
  • the process features are as follows: passivation bath composition expressed in g/1
  • the passivation bath is an aqueous solution containing
  • the passivation bath is an aqueous solution containing Titanium oxalate.
  • the process features are as follows: passivation bath composition expressed in g/1
  • the passivation bath is an aqueous solution containing Sodium molybdate.
  • the process features are as follows: passivation bath composition expressed in g/1
  • a further object of the present invention is a tinned stainless steel strip, passivated with the abovedisclosed process.
  • Another further object of the present invention is a tinned stainless steel strip, passivated with the abovedisclosed process, painted with Chrome- free paints.
  • Another object of the present invention is the use of the tinned stainless steel strip, passivated and painted without use of Chrome, for the production of tinned goods.
  • Fig. 1 shows the potentiodynamic polarization curves in citrate buffer, at pH 6, scanning speed 0.2 mV/s, 50°C, for a tinned strip, not passivated (dotted curve), passivated with a Chrome-based solution (broken-line curve) , and passivated according to the invention (solid curve) with the following process features: passivation bath containing 15 g/1 CoS0 4 -7H 2 0, 15 g/1 K 2 TiF 6 and 5 g/1 NaN0 3 (electrolyte 1) ; bath temperature 50°C; current density applied 0.15 A/dm 2 ; and exposure time 1 s.
  • Fig. 2 shows the potentiodynamic polarization curves in citrate buffer, at pH 6,0, scanning speed 0,2 mV/s, 50°C, for a tinned strip, not passivated (dotted curve) , passivated with Chrome-based solutions (broken-line curve) , passivated according to the invention (solid curve) with the following process features: passivation bath containing 15 g/1 K 2 TiF 6 and 5 g/1 NaN0 3 (electrolyte 2); bath temperature 50°C; current density applied 0.14 A/dm 2 ; exposure time 30 s.
  • Fig. 3 shows an EDS (X-ray Dispersive Energy Spectrometry Measurements) spectrum of an untreated tinned strip, to be subjected to the process for the passivation according to the invention.
  • Figs. 4 and 5 show the GDOES (Glow Discharge for Optical Emission Spectrochemical Analysis) profiles for samples passivated with the electrolyte 1 and with the electrolyte 2 according to the invention, respectively.
  • a tinned strip to be subjected to the process for the passivation according to the invention is characterised with the EDX (X-ray Dispersive Energy Spectrometry Measurements) technique.
  • the related spectrum shown in Fig. 3, reveals the presence of Tin as a massive element and of Iron.
  • the Chrome content highlighted by atomic absorption spectroscopy, ranges from 0.58 to 0.67 mg/m 2 .
  • This tinned strip is subjected to passivation according to the invention, in aqueous solution at 50 °C containing 15 g/1 K 2 TiF 6 and 5 g/1 NaN0 3 , with a cathode current density equal to 0.14 A/dm 2 and an exposure time of 30 s.
  • the corrosion behaviour of samples of tinned strip thus passivated is studied by potentiodynamic polarization curves and exposition tests in a 30 g/1 sodium chloride solution for 24 hours at 25°C.
  • the potentiodynamic polarization curves are constructed by measuring taken with a conventional glass cell at 25°C in a solution saturated with pure Nitrogen.
  • the counterelectrode is a Platinum sheet and, as reference electrode, a saturated calomel electrode (SCE) is used.
  • the electrolyte is a citrate buffer, at pH 6,0.
  • the scanning speed is 0.2 mV/s.
  • the polarization curves are plotted after the stabilization of the corrosion potential (about 90 min) . Fig.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Photovoltaic Devices (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

L'invention concerne un procédé de passivation de bandes d'acier inoxydable étamé au moyen d'un film de passivation sans chrome. Le procédé consiste à tremper la bande étamée, éventuellement à appliquer un courant de cathode, dans un bain de passivation comprenant au moins un sel d'un métal de transition sélectionné parmi le cobalt, le titane, le zirconium et le molybdenum. L'invention concerne la bande étamée passivée ainsi obtenue, la bande étamée passivée et recouverte d'une peinture sans chrome, et l'utilisation de cette dernière dans la production de produits en conserves.
EP01994948A 2000-12-19 2001-12-19 Procede de passivation d'une bande d'acier inoxydable etame au moyen d'un film de passivation sans chrome Withdrawn EP1368515A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT2000RM000679A IT1316032B1 (it) 2000-12-19 2000-12-19 Procedimento per la passivazione di banda di acciaio stagnata con film di passivazione senza cromo.
ITRM20000679 2000-12-19
PCT/IT2001/000643 WO2002050341A2 (fr) 2000-12-19 2001-12-19 Procede de passivation d'une bande d'acier inoxydable etame au moyen d'un film de passivation sans chrome

Publications (1)

Publication Number Publication Date
EP1368515A2 true EP1368515A2 (fr) 2003-12-10

Family

ID=11455067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01994948A Withdrawn EP1368515A2 (fr) 2000-12-19 2001-12-19 Procede de passivation d'une bande d'acier inoxydable etame au moyen d'un film de passivation sans chrome

Country Status (4)

Country Link
EP (1) EP1368515A2 (fr)
AU (1) AU2002225326A1 (fr)
IT (1) IT1316032B1 (fr)
WO (1) WO2002050341A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102268664A (zh) * 2011-07-28 2011-12-07 顺德职业技术学院 镀锌层黑色钝化处理用无铬钝化液及其制备方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2484381C (fr) 2004-10-08 2013-03-19 Anne Marie Sedgwick Support
DE102009044982A1 (de) * 2009-09-24 2011-03-31 Stefan Dameron Verfahren zum Galvanisieren und zur Passivierung
CN104562029A (zh) * 2014-12-26 2015-04-29 江苏新华明机械制造实业有限公司 高频调谐器框架冲压件表面处理工艺
CN109975340A (zh) * 2017-12-26 2019-07-05 上海梅山钢铁股份有限公司 镀铝锌板无铬钝化膜厚度的微观分析方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298404A (en) * 1979-09-06 1981-11-03 Richardson Chemical Company Chromium-free or low-chromium metal surface passivation
US4444601A (en) * 1979-09-06 1984-04-24 Richardson Chemical Company Metal article passivated by a bath having an organic activator and a film-forming element
JPS5698480A (en) * 1980-01-11 1981-08-07 Kobe Steel Ltd Rust preventive treatment of galvanized steel material
DK187391D0 (da) * 1991-11-15 1991-11-15 Inst Produktudvikling Fremgangsmaade til efterbehandling af zinkbelagte materialer samt behandlingsoploesning til brug ved fremgangsmaaden
GB2298870B (en) * 1995-03-13 1998-09-30 British Steel Plc Passivation treatment of tinplate
DE19745801A1 (de) * 1997-10-16 1999-04-22 Henkel Kgaa Verfahren zum Beschichten von Metallen und hiermit beschichtetes Metall

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0250341A3 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102268664A (zh) * 2011-07-28 2011-12-07 顺德职业技术学院 镀锌层黑色钝化处理用无铬钝化液及其制备方法
CN102268664B (zh) * 2011-07-28 2013-04-17 顺德职业技术学院 镀锌层黑色钝化处理用无铬钝化液及其制备方法

Also Published As

Publication number Publication date
ITRM20000679A1 (it) 2002-06-19
AU2002225326A1 (en) 2002-07-01
ITRM20000679A0 (it) 2000-12-19
WO2002050341A2 (fr) 2002-06-27
IT1316032B1 (it) 2003-03-26
WO2002050341A3 (fr) 2003-09-25

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