CA2252036A1 - Chromate-free conversion layer and process for producing the same - Google Patents

Chromate-free conversion layer and process for producing the same

Info

Publication number
CA2252036A1
CA2252036A1 CA002252036A CA2252036A CA2252036A1 CA 2252036 A1 CA2252036 A1 CA 2252036A1 CA 002252036 A CA002252036 A CA 002252036A CA 2252036 A CA2252036 A CA 2252036A CA 2252036 A1 CA2252036 A1 CA 2252036A1
Authority
CA
Canada
Prior art keywords
conversion layer
chromate
producing
same
free conversion
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
Application number
CA002252036A
Other languages
French (fr)
Other versions
CA2252036C (en
Inventor
Patricia Preikschat
Rolf Jansen
Peter Hulser
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.)
Surtec International GmbH
Original Assignee
Individual
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
Priority claimed from DE19615664A external-priority patent/DE19615664A1/en
Application filed by Individual filed Critical Individual
Publication of CA2252036A1 publication Critical patent/CA2252036A1/en
Application granted granted Critical
Publication of CA2252036C publication Critical patent/CA2252036C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C23C22/48—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
    • 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
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

A chromate-free, chromic and substantially coherent conversion layer based on zinc or zinc alloys offers a protection against corrosion from about 100 to 1000 h, as proven by the salt spray test of DIN 50021 SS or ASTM B 117-73 to first corrosion as described by DIN
50961, chapter 10, even when it does not contain other components such as silicate, Cer, aluminium and borate. This conversion layer is clear, transparent, substantially colourless and iridescent, is about 100 nm to 1000 nm thick, hard, adheres well and is stable against wiping.
CA002252036A 1996-04-19 1997-04-18 Chromate-free conversion layer and process for producing the same Expired - Lifetime CA2252036C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19615664.5 1996-04-19
DE19615664A DE19615664A1 (en) 1996-04-19 1996-04-19 Chromium (VI) free chromate layer and process for its production
PCT/DE1997/000800 WO1997040208A1 (en) 1996-04-19 1997-04-18 Chromate-free conversion layer and process for producing the same

Publications (2)

Publication Number Publication Date
CA2252036A1 true CA2252036A1 (en) 1997-10-30
CA2252036C CA2252036C (en) 2006-12-05

Family

ID=37560875

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002252036A Expired - Lifetime CA2252036C (en) 1996-04-19 1997-04-18 Chromate-free conversion layer and process for producing the same

Country Status (1)

Country Link
CA (1) CA2252036C (en)

Also Published As

Publication number Publication date
CA2252036C (en) 2006-12-05

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Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20170418