EP0089456A1 - Solution organique pour la phosphatation des surfaces métalliques - Google Patents

Solution organique pour la phosphatation des surfaces métalliques Download PDF

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Publication number
EP0089456A1
EP0089456A1 EP83100471A EP83100471A EP0089456A1 EP 0089456 A1 EP0089456 A1 EP 0089456A1 EP 83100471 A EP83100471 A EP 83100471A EP 83100471 A EP83100471 A EP 83100471A EP 0089456 A1 EP0089456 A1 EP 0089456A1
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European Patent Office
Prior art keywords
phosphating
ester
weight
percent
methanol
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EP83100471A
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German (de)
English (en)
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EP0089456B1 (fr
Inventor
Dieter Jürgen Dr. Müller
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Huels AG
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Huels AG
Chemische Werke Huels AG
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Priority to AT83100471T priority Critical patent/ATE15235T1/de
Publication of EP0089456A1 publication Critical patent/EP0089456A1/fr
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Publication of EP0089456B1 publication Critical patent/EP0089456B1/fr
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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
    • C23C22/02—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 non-aqueous solutions
    • C23C22/03—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 non-aqueous solutions containing phosphorus compounds

Definitions

  • the invention relates to homogeneous organic phosphating solutions based on low-boiling halogenated hydrocarbons as the base component, which also aqueous phosphoric acid as a phosphating agent, a low-boiling alcohol, such as. B. methanol as a solubilizer, aromatic nitro compounds as hydrogen acceptors or accelerators, urea and derivatives as HCl acceptors or stabilizers and additionally contain an activating nucleating agent.
  • aqueous phosphoric acid as a phosphating agent
  • a low-boiling alcohol such as.
  • B. methanol as a solubilizer
  • aromatic nitro compounds as hydrogen acceptors or accelerators
  • urea and derivatives as HCl acceptors or stabilizers and additionally contain an activating nucleating agent.
  • metal surfaces in particular iron and unalloyed steel, can be phosphated by means of aqueous phosphoric acid which is homogeneously dissolved in a halogenated hydrocarbon.
  • H. analogous to conventional non-layer-forming Fe phosphating see W. Rausch, The Phosphating of Metals, Eugen G. Leuze Verlag, Saulgau (1974), page 103) with a surface layer made of iron phosphates.
  • the phosphate layer is to serve as a corrosion protection layer and / or as an inorganic primer layer for subsequent painting, then certain requirements must be placed on the properties of the layer.
  • the layer thickness should be at least 0.3 pm, and the layer should also be as uniform as possible, slightly water-soluble, firmly adhering, non-porous and microcrystalline.
  • the phosphate layer should have good anti-corrosion properties and should be a good primer for subsequent painting.
  • a number of other components are recommended, on the one hand act as stabilizers or inhibitors on the phosphating solution and on the other hand promote or achieve certain properties of the phosphate layers as accelerators or inhibitors.
  • Inhibitors are sometimes also spoken of, including, for example, according to US Pat. No. 3,338,754, such different substance classes as nitrobenzene, glacial acetic acid and substituted alkylthioureas.
  • accelerator such as. B. in DE-OS 26 11 790 compounds such as dimethyl sulfoxide, pyridine, quinone or amylphenol. These compounds are said to accelerate the formation of the phosphate layers considerably, as is the presence of small amounts of zinc salts according to US Pat.
  • DE-OS 26 11 789 and DE-OS 26 11 790 undesirable granular phosphate coatings are avoided by the presence of an aprotic compound, such as in particular N, N-dimethylformamide, but also dimethyl sulfoxide, acetonitrile, acetone, tetramethylene sulfone and combinations thereof.
  • an aprotic compound such as in particular N, N-dimethylformamide, but also dimethyl sulfoxide, acetonitrile, acetone, tetramethylene sulfone and combinations thereof.
  • DE-AS 12 22 351 proposes compounds of the dimethylglyoxime or indigo type.
  • the desired additional component should influence the primary step, namely to promote the activation of the metallic surface immediately before the phosphating reaction and act specifically on the formation of the primary crystals, on the other hand, it should also have a comparatively high vapor pressure and, in particular when using the phosphating solutions, cannot form any secondary products that make themselves noticeable through enrichment.
  • the phosphating solutions preferably contain the formic acid ester in a concentration of 0.1 to 1.0 percent by weight.
  • the phosphating solutions contain only formic acid methyl ester as formic acid ester.
  • the formic acid methyl ester meets the requirements outlined above in an outstanding manner. It can be shown that this ester promotes denser phosphate nucleation on the surface. As a result, this ester can also be called an activating nucleating agent.
  • ester is its physical and chemical properties, which blend harmoniously into the properties of low-boiling, organic phosphating solutions, for example phosphating solutions based on dichloromethane, methanol and aqueous phosphoric acid. At a boiling point of 31.5 ° C., it is ensured that the ester cannot undesirably accumulate in the phosphating solution with a boiling point> 35 ° C.
  • the chemical properties also ensure that no undesirable high-boiling secondary products can accumulate in the phosphating solution.
  • the comparatively high vapor pressure of this ester has another special advantage.
  • the gas phase which is in equilibrium with a boiling, ester-containing phosphating solution always has noticeable ester contents, so that the ester already has an immersion phosphating before the actual phosphating the surface of the workpieces can act. That is, If the workpieces are kept in the gas phase above the phosphating bath in the usual way for preheating until condensate no longer runs off, the workpieces are already subjected to surface activation by the ester in the preheating interval without phosphating. This additional activation in the vapor phase can also be used to advantage in the case of multiple dipping phosphating with hanging intervals in the gas phase between dives in the liquid phase.
  • the activating crystal nucleation can also be achieved by the likewise low-boiling ethyl formate with a boiling point of 54 ° C.
  • the higher homologous formic acid esters are also suitable, because these are in any case subject to phosphating baths containing methanol under the catalytic influence of phosphoric acid to undergo a transesterification into the methyl ester.
  • the use of the methyl ester is preferred.
  • the phosphating solution contains between 0.01% and 2%, preferably between 0 and 1.0%, formic acid ester.
  • Levels lower than 0.01% are hardly effective, contents higher than 2.% increasingly lead to undesirable crystal build-up, which is characterized by crystal efflorescence on the metal surface.
  • Possible low-boiling alcohols which can be used as solubilizers are: methanol, ethanol, isopropanol, propanol, butanol, sec-butanol, tert. -Butanol, n-pentanol, sec. -Pentanol, hexanol, heptanol, octanol, 2-ethylhexanol, nonanol, deeanol, undecanol, dodecanol and their mixtures.
  • ureas urea, dimethyl urea, diethyl urea and other alkylated ureas and mixtures thereof.
  • nitroaromatics can be used: nitrobenzene, dinitrobenzene, nitrotoluene, dinitrotoluene, nitroethylbenzene and mixtures thereof.
  • the following may also be used as additional stabilizers: quinones, phenols, nitrophenols and nitromethane.
  • nitroureas nitroureas, thioureas, methylthiourea, ethylthiourea, dimethylthiourea, diethylthiourea and alkylated thioureas.
  • the following compounds can optionally be used as additional accelerators: pyridine and picric acid.
  • the main solvent will generally be present at 60 to 85 percent by weight, preferably 70 to 80 percent by weight, based on the total phosphating solution, while the aqueous phosphoric acid should be used in such an amount that an H 3 PO 4 concentration of 0.1 to 2 , 0 percent by weight, preferably 0.3 to 1.0 percent by weight, based on the total phosphating solution.
  • the concentration of water in the phosphating solution should be 0.5 to 7 percent by weight, preferably 3.0 to 6.0 percent by weight.
  • Methanol or a mixture of alcohols with a predominant proportion of methanol is used as a solubilizer.
  • concentration of the methanol or alcohol mixture with a predominant methanol content should be 10 to 30 percent by weight, preferably 15 to 25 percent by weight, based on the total phosphating solution.
  • Urea should be used in a concentration of 0.01 to 1.0 percent by weight, preferably 0.05 to 0.5 percent by weight, based on the total phosphating solution.
  • Nitroaromatics can be used in a concentration of 0.01 to 1.0 percent by weight, preferably 0.05 to 0.5 percent by weight, based on the total phosphating solution.
  • the additional accelerators, stabilizers and inhibitors can each be present in a concentration of 0.01 to 1.0 percent by weight, preferably 0.05 to 0.5 percent by weight, based on the total phosphating solution.
  • the formic acid ester can be present in a concentration of 0.01 to 2.0 percent by weight, preferably 0.1 to 1.0 percent by weight, based on the total phosphating solution.
  • the formic acid ester used is preferably formic acid methyl ester, but also the use of formic acid ethyl ester, propyl ester, isopropyl ester, butyl ester, and sec. butyl ester and tert. -butyl ester or mixtures thereof is possible.
  • higher homologous formic acid esters such. B. also in question: n-pentyl formate, -sec. -pentyl ester, -n-hexyl ester, -sec.
  • esters preferably contain 1 to 4 carbon atoms in the alcohol part.
  • Low-carbon, cold-rolled deep drawing sheets St 1405 with the dimensions 10 x 20 cm are used as test workpieces, which are degreased with steam or immersion using standard metal degreasing baths. After degreasing, these test panels are weighed in a dry state and then subjected to immersion phosphating.
  • a heated jacket is used as the phosphating vessel, which is about half full with phosphating solution and which is provided with cooling coils at the upper edge to avoid evaporation losses and with a lid with a passage for a diving device.
  • the steel sheets described are first preheated in the gas phase above the boiling phosphating solution until no more condensate drains off, and then phosphated by immersion in the phosphating solutions shown in Table 1. 60 seconds have been selected as diving time. After the phosphating, the sheets can optionally be sprayed with the condensate from the gas phase, after which the sheets are lifted into the atmosphere through the cooling zone, and these dry immediately. After determining the increase in mass, the sheets are subjected to scanning electron microscopy (SEM) in order to check the microcrystallinity and the uniform distribution of the crystals adhering to the metal surface.
  • SEM scanning electron microscopy
  • the sheets have also been subjected to test coatings with various coating systems based on an alkyd resin (air drying), alkyd melamine resin (stoving lacquer) and epoxy resin (2-component system).
  • the dry layers of paint have a uniform thickness of approx. 30 pm.
  • the painted metal sheets are subjected to a salt spray test in accordance with DIN 50 021 and DIN 53 167, and the width of the rusting is then determined.
  • S 1 a, 1 b and 1 c SEM images are shown, which document that the presence of methyl formate significantly improves the microcrystalline structure of the phosphate layer and that the crystallites are distributed more evenly. With an ester content of 2%, undesirable crystals obviously form in isolated cases. flowers on the surface.
  • Example 1 steel sheets were phosphated in the phosphating solutions shown in Table 3 after preheating by immersion with a dipping time of 60 seconds, the results given in Table 3 having been achieved.
  • the improvement in the phosphate layer quality due to the presence of the methyl formate is also clearly visible here.

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  • 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)
  • Chemically Coating (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP83100471A 1982-03-18 1983-01-20 Solution organique pour la phosphatation des surfaces métalliques Expired EP0089456B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100471T ATE15235T1 (de) 1982-03-18 1983-01-20 Organische phosphateirloesung zur phosphatierung von metalloberflaechen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3209829 1982-03-18
DE19823209829 DE3209829A1 (de) 1982-03-18 1982-03-18 Organische phosphatierloesung zur phosphatierung von metalloberflaechen

Publications (2)

Publication Number Publication Date
EP0089456A1 true EP0089456A1 (fr) 1983-09-28
EP0089456B1 EP0089456B1 (fr) 1985-08-28

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ID=6158567

Family Applications (1)

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EP83100471A Expired EP0089456B1 (fr) 1982-03-18 1983-01-20 Solution organique pour la phosphatation des surfaces métalliques

Country Status (7)

Country Link
US (1) US4451301A (fr)
EP (1) EP0089456B1 (fr)
JP (1) JPS58167779A (fr)
AT (1) ATE15235T1 (fr)
DE (2) DE3209829A1 (fr)
DK (1) DK119683A (fr)
GR (1) GR77947B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0276371A1 (fr) * 1987-01-09 1988-08-03 Nippon Dacro Shamrock Co. Ltd. Procédé de traitement de surfaces métalliques
EP0361375A1 (fr) * 1988-09-27 1990-04-04 Nihon Parkerizing Co., Ltd. Procédé de production de revêtements
KR100731202B1 (ko) * 1999-11-26 2007-06-22 소니 가부시끼 가이샤 연마 장치 및 연마 방법

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0126220A1 (fr) * 1983-04-26 1984-11-28 Hüls Aktiengesellschaft Solution de décapage pour surfaces métalliques et son utilisation
ZA9810830B (en) 1997-11-26 1999-05-31 Futuratec Cc A preservative and fire retardant composition and combination and process
CN110559930B (zh) * 2019-09-16 2021-11-30 山东益丰生化环保股份有限公司 一种车用尿素溶液及其制备方法
EP3940106A1 (fr) * 2020-07-15 2022-01-19 TI Automotive Engineering Centre (Heidelberg) GmbH Procédé de revêtement d'une conduite et conduite
CN113718238A (zh) * 2021-07-29 2021-11-30 重庆嘉陵特种装备有限公司 一种防腐环保型磷化剂和该磷化剂的制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2611789B2 (de) * 1975-03-20 1980-09-18 Diamond Shamrock Corp., Cleveland, Ohio (V.St.A.) Homogene Phosphatierungslösung und Verfahren zur Bildung eines wasserunlöslichen Phosphatüberzugs auf Metallgegenständen >
DE2611790B2 (de) * 1975-03-20 1980-11-13 Diamond Shamrock Corp., Cleveland, Ohio (V.St.A.) Phosphatierungslösung und Verfahren zur Anwendung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA690340A (en) * 1964-07-07 Hooker Chemical Corporation Process and composition for phosphatizing metals
CA607061A (en) * 1960-10-18 B. Copelin Harry Composition and process for phosphatizing metal
US2854370A (en) * 1957-10-04 1958-09-30 Oakite Prod Inc Composition and method for phosphate coating of metal
US2992146A (en) * 1959-02-26 1961-07-11 Du Pont Process of phosphating in a trichlorethylene vapor zone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2611789B2 (de) * 1975-03-20 1980-09-18 Diamond Shamrock Corp., Cleveland, Ohio (V.St.A.) Homogene Phosphatierungslösung und Verfahren zur Bildung eines wasserunlöslichen Phosphatüberzugs auf Metallgegenständen >
DE2611790B2 (de) * 1975-03-20 1980-11-13 Diamond Shamrock Corp., Cleveland, Ohio (V.St.A.) Phosphatierungslösung und Verfahren zur Anwendung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED, Sektion Ch, Woche D43, 2. Dezember 1981 DERWENT PUBLICATIONS LTD., London, M13; & SU-A-800240 (SARAT UNIV CHEM RES) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0276371A1 (fr) * 1987-01-09 1988-08-03 Nippon Dacro Shamrock Co. Ltd. Procédé de traitement de surfaces métalliques
EP0361375A1 (fr) * 1988-09-27 1990-04-04 Nihon Parkerizing Co., Ltd. Procédé de production de revêtements
KR100731202B1 (ko) * 1999-11-26 2007-06-22 소니 가부시끼 가이샤 연마 장치 및 연마 방법

Also Published As

Publication number Publication date
JPS58167779A (ja) 1983-10-04
DE3360629D1 (en) 1985-10-03
ATE15235T1 (de) 1985-09-15
DK119683A (da) 1983-09-19
DK119683D0 (da) 1983-03-15
EP0089456B1 (fr) 1985-08-28
US4451301A (en) 1984-05-29
DE3209829A1 (de) 1983-10-06
GR77947B (fr) 1984-09-25

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