FR2323776A1 - Phosphate coating of iron and steel - where nitrite content of coating soln. is restricted to prevent redn. in coating thickness - Google Patents

Phosphate coating of iron and steel - where nitrite content of coating soln. is restricted to prevent redn. in coating thickness

Info

Publication number
FR2323776A1
FR2323776A1 FR7627141A FR7627141A FR2323776A1 FR 2323776 A1 FR2323776 A1 FR 2323776A1 FR 7627141 A FR7627141 A FR 7627141A FR 7627141 A FR7627141 A FR 7627141A FR 2323776 A1 FR2323776 A1 FR 2323776A1
Authority
FR
France
Prior art keywords
coating
phosphate
redn
restricted
iron
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
FR7627141A
Other languages
French (fr)
Other versions
FR2323776B1 (en
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.)
Individual
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
Application filed by Individual filed Critical Individual
Publication of FR2323776A1 publication Critical patent/FR2323776A1/en
Application granted granted Critical
Publication of FR2323776B1 publication Critical patent/FR2323776B1/fr
Granted 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
    • C23C22/07—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 phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • C23C22/13—Orthophosphates containing zinc cations containing also nitrate or nitrite anions
    • 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
    • C23C22/07—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 phosphates
    • C23C22/08—Orthophosphates
    • C23C22/22—Orthophosphates containing alkaline earth metal cations

Abstract

The coatings are obtd. by immersion or flooding with an aq. acid soln. contng. zinc, phosphate and nitrate, at 60-90 degrees C., forming nitrite autocatalytically. The NO2 content is kept at min. 0.03 g./l. but is prevented from exceeding 0.2 g./l. by adding substances which decompose the nitrites. The pref. bath contains min. 6 g./l. Zn; min. 5 g./l P2O5; min. 10 g./l. NO3; and 0.03-0.2 g./l. NO2; with acid number 20-80, and wt. ratio P2O5:Zn:NO3 of 1:(0.8-4):(1.8-6); and wt. ratio free P2O5:total P2O5 0.2-0.6:1. The bath may also contain min. 0.4 g./l. Ca. Nitrite contents above 0.2 g./l. tend to produce very thin phosphate coatings which are unsuitable for substrates which will be subjected to cold working or where the coating is required for corrosion protection. The invention solves this problem.
FR7627141A 1975-09-12 1976-09-09 Phosphate coating of iron and steel - where nitrite content of coating soln. is restricted to prevent redn. in coating thickness Granted FR2323776A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752540684 DE2540684A1 (en) 1975-09-12 1975-09-12 PROCESS FOR PRODUCING PHOSPHATE COATINGS ON METAL SURFACES

Publications (2)

Publication Number Publication Date
FR2323776A1 true FR2323776A1 (en) 1977-04-08
FR2323776B1 FR2323776B1 (en) 1980-10-31

Family

ID=5956298

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7627141A Granted FR2323776A1 (en) 1975-09-12 1976-09-09 Phosphate coating of iron and steel - where nitrite content of coating soln. is restricted to prevent redn. in coating thickness

Country Status (8)

Country Link
AT (1) AT345627B (en)
BE (1) BE846009A (en)
BR (1) BR7605426A (en)
DE (1) DE2540684A1 (en)
FR (1) FR2323776A1 (en)
IT (1) IT1068150B (en)
NL (1) NL7609015A (en)
SE (1) SE7610069L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363200A2 (en) * 1988-10-06 1990-04-11 Nippon Paint Co., Ltd. Improvement of zinc phosphate treatment for cold working

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2080835B (en) * 1980-07-25 1984-08-30 Pyrene Chemical Services Ltd Prevention of sludge in phosphating baths
DE3407513A1 (en) * 1984-03-01 1985-09-05 Gerhard Collardin GmbH, 5000 Köln METHOD FOR ZINC-CALCIUM PHOSPHATION OF METAL SURFACES AT LOW TREATMENT TEMPERATURE
EP0327153B1 (en) * 1988-02-03 1993-08-04 Metallgesellschaft Ag Process for applying phosphate coatings to metals
US11566330B2 (en) * 2019-04-16 2023-01-31 Ppg Industries Ohio, Inc. Systems and methods for maintaining pretreatment baths

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363200A2 (en) * 1988-10-06 1990-04-11 Nippon Paint Co., Ltd. Improvement of zinc phosphate treatment for cold working
EP0363200A3 (en) * 1988-10-06 1990-07-18 Nippon Paint Co., Ltd. Improvement of zinc phosphate treatment for cold working

Also Published As

Publication number Publication date
SE7610069L (en) 1977-03-13
FR2323776B1 (en) 1980-10-31
NL7609015A (en) 1977-03-15
DE2540684A1 (en) 1977-03-17
ATA459876A (en) 1978-01-15
IT1068150B (en) 1985-03-21
AT345627B (en) 1978-09-25
BR7605426A (en) 1977-08-16
BE846009A (en) 1976-12-31

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Legal Events

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ST Notification of lapse