EP0017302B1 - Procédé de rinçage durant la phosphatation de substrats métalliques - Google Patents

Procédé de rinçage durant la phosphatation de substrats métalliques Download PDF

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Publication number
EP0017302B1
EP0017302B1 EP80200302A EP80200302A EP0017302B1 EP 0017302 B1 EP0017302 B1 EP 0017302B1 EP 80200302 A EP80200302 A EP 80200302A EP 80200302 A EP80200302 A EP 80200302A EP 0017302 B1 EP0017302 B1 EP 0017302B1
Authority
EP
European Patent Office
Prior art keywords
rinse
stage
rinsing
post
water
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.)
Expired
Application number
EP80200302A
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German (de)
English (en)
Other versions
EP0017302A1 (fr
Inventor
Geoffrey L. Davis
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.)
GEA Group AG
Continentale Parker Ste
Continentale Parker SA
Original Assignee
Metallgesellschaft AG
Continentale Parker Ste
Continentale Parker SA
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 Metallgesellschaft AG, Continentale Parker Ste, Continentale Parker SA filed Critical Metallgesellschaft AG
Priority to AT80200302T priority Critical patent/ATE5003T1/de
Publication of EP0017302A1 publication Critical patent/EP0017302A1/fr
Application granted granted Critical
Publication of EP0017302B1 publication Critical patent/EP0017302B1/fr
Expired legal-status Critical Current

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    • 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
    • C23C22/73—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 characterised by the process

Definitions

  • the invention relates to a rinsing process in the application of phosphate coatings to metals, the metal surface passing through at least one pre-rinsing stage, a phosphating stage and at least two rinsing stages and rinsing water of the first rinsing stage being freed from annoying anions and cations and being used again for rinsing purposes after sludge removal .
  • the typical process for phosphating processes consists in cleaning the metal surfaces, pre-rinsing before phosphating, phosphating itself and rinsing, which usually takes place in at least two stages.
  • a disadvantage of the known methods is that either the fresh water savings are not satisfied or that considerable amounts of phosphating agent are introduced by the introduction of rinse water from the first rinse stage into the pre-rinse stage. These can cause a pre-passivation, which impairs the perfect layer formation in the phosphating stage.
  • the object of the invention is to provide a rinsing process which avoids the disadvantages of the known processes, has a low fresh water requirement and rules out pre-passivation phenomena.
  • the object is achieved in that the rinsing method mentioned at the outset is designed in accordance with the invention in such a way that practically all of the cleaned rinsing water after passing through the second rinsing stage NS2 is fed to the pre-rinsing stage VS and then returned to the first rinsing stage NS1.
  • the water cleaned in the cleaning device is passed into the second rinse stage and from there into the pre-rinse stage.
  • the rinse water from the pre-rinse stage is then led into the first rinse stage.
  • This process which is a self-contained system, allows fresh water savings of around 90%. It is preferably suitable for phosphating processes that work with hydrogen peroxide accelerators.
  • the pre-rinse stage When carrying out the method, it is possible to divide the pre-rinse stage into two treatment zones.
  • the water that is fed to the pre-rinse stage is either divided between the two treatment zones or first to the second and then to the first rinse zone of the pre-rinse stage, as viewed in the direction of the flow of the metal surfaces.
  • the rinse water is then returned to the first rinse stage.
  • the second rinse stage can also be divided into two rinse zones.
  • the rinse water from the last rinse zone is fed to the second rinse stage of the first rinse zone and from there to the pre-rinse stage.
  • the metal surfaces emerging from the second rinse stage can be subjected to a further rinse treatment with fresh water, which then flows to the second rinse stage.
  • the individual rinsing stages can be used for diving and / or spraying.
  • the disruptive anions and cations are removed in a manner known per se.
  • Phosphates and heavy metals can be precipitated, for example, by neutralization with alkaline earth metal hydroxide, especially milk of lime.
  • the reaction mixture is brought to a pH of about 8.5.
  • Dissolved alkali ions are not precipitated, but generally cause less interference, at least as long as there is no excessive accumulation in the rinsing baths.
  • Such excessive enrichment can be avoided by e.g. B. in the formulation of degreasing and phosphating baths to the extent possible avoids the use of ions which result in soluble salts in the treatment with alkaline earth metal hydroxide.
  • the precipitate resulting from the neutralization of the removed rinsing bath can be removed by the known methods of sludge separation, e.g. be removed from the solution by sedimentation and / or filtration.
  • the separated sludge can be fed to a sludge thickener and a filter press for further concentration.
  • the rinse water can be passed through a surfactant adsorber. This is recommended if a surfactant-containing solution is used in the degreasing stage.
  • the sludge obtained in the phosphating stage is included in the method of cleaning the rinsing water.
  • the sludge is separated off in the usual manner, but the thin sludge is also introduced into the treatment plant for reaction with suitable precipitants.
  • the flushing method according to the invention is explained in more detail and, for example, using the figure. It represents a flow diagram for the rinse water.
  • the initially degreased metal surfaces are passed through the pre-rinsing stage VS, the phosphating stage P, the first rinsing stage NS1 and the second rinsing stage NS2.
  • the rinse water first passes from the cleaning device R into the second rinse stage NS2 and from there into the pre-rinse stage VS. After exiting the pre-rinse stage VS, it is returned to the first rinse stage NS1 and then fed to the cleaning device R.
  • Losing water losses due to evaporation or mechanical discharge are compensated for by adding fresh water, which is expediently fed to the post-rinsing stage NS2.
  • the arrow on the cleaning device R indicates the discharge of sludge.

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)
  • Removal Of Specific Substances (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (1)

  1. Procédé de rinçage lors du dépôt le revêtements de phosphate sur des métaux, dans lequel la surface métallique parcourt au moins un stade de pré-rinçage, un stade de phosphatation, et au moins deux stades de post-rinçage et l'eau de rinçage du premier stade de post-rinçage est dé- barassée des anions et cation188 gênants par addition d'agents de précipitation et réutilisée pour des opérations de rinçage après séparation des boues, caractérisé en ce qu'on envoie au stade de pré-rinçage (Pré-R) pratiquement la totalité de l'eau de rinçage épurée après qu'elle ait traversé uniquement le deuxième stade de post-rinçage (PR-2) et ensuite, on la envoie au premier stade de post-rinçage (PR-1).
EP80200302A 1979-04-07 1980-04-01 Procédé de rinçage durant la phosphatation de substrats métalliques Expired EP0017302B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80200302T ATE5003T1 (de) 1979-04-07 1980-04-01 Spuelverfahren bei der aufbringung von phosphatueberzuegen auf metallen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7912299 1979-04-07
GB7912299 1979-04-07

Publications (2)

Publication Number Publication Date
EP0017302A1 EP0017302A1 (fr) 1980-10-15
EP0017302B1 true EP0017302B1 (fr) 1983-10-12

Family

ID=10504422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200302A Expired EP0017302B1 (fr) 1979-04-07 1980-04-01 Procédé de rinçage durant la phosphatation de substrats métalliques

Country Status (3)

Country Link
EP (1) EP0017302B1 (fr)
AT (1) ATE5003T1 (fr)
DE (1) DE3065238D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4307591A1 (de) * 1992-06-22 1994-09-15 Eisenmann Kg Maschbau Verfahren zur Nitritkonzentrationssenkung in Phosphatbad-Anlagen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU591231B2 (en) * 1986-02-18 1989-11-30 Parker Chemical Company Aluminum cleaning process
DE102008038653A1 (de) * 2008-08-12 2010-03-25 Henkel Ag & Co. Kgaa Sukzessive korrosionsschützende Vorbehandlung von Metalloberflächen in einem Mehrstufenprozess
CN109989091B (zh) * 2019-04-17 2024-09-03 镇江耐丝新型材料有限公司 一种钢丝用电解磷化系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB150475A (en) * 1919-06-28 1920-09-09 Frank Silson Improved device for transmitting and magnifying sound
DE1805655C2 (de) * 1968-10-28 1974-10-17 Steuler Industriewerke Gmbh Verfahren zur Fluessigkeitsspuelung von Gegenstaenden
GB1345716A (en) * 1971-03-22 1974-02-06 Oxy Effluent Control Ltd Method and apparatus for rinsing contaminated articles
DE2729006A1 (de) * 1977-06-28 1979-01-04 Didier Werke Ag Verfahren zur fluessigkeitsspuelung von gegenstaenden
GB1540308A (en) * 1977-12-08 1979-02-07 Pyrene Chemical Services Ltd Process for the treatment of metal surfaces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4307591A1 (de) * 1992-06-22 1994-09-15 Eisenmann Kg Maschbau Verfahren zur Nitritkonzentrationssenkung in Phosphatbad-Anlagen

Also Published As

Publication number Publication date
DE3065238D1 (en) 1983-11-17
ATE5003T1 (de) 1983-10-15
EP0017302A1 (fr) 1980-10-15

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