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WO2009059798A2 - Procédé de fabrication d'un revêtement sur un substrat métallique et revêtement obtenu par ce procédé - Google Patents

Procédé de fabrication d'un revêtement sur un substrat métallique et revêtement obtenu par ce procédé Download PDF

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Publication number
WO2009059798A2
WO2009059798A2 PCT/EP2008/009475 EP2008009475W WO2009059798A2 WO 2009059798 A2 WO2009059798 A2 WO 2009059798A2 EP 2008009475 W EP2008009475 W EP 2008009475W WO 2009059798 A2 WO2009059798 A2 WO 2009059798A2
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WO
WIPO (PCT)
Prior art keywords
coating
substrate
vtms
coating mixture
silane
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.)
Ceased
Application number
PCT/EP2008/009475
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English (en)
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WO2009059798A3 (fr
Inventor
Henagame Liyanage Mallika Bohm
Sivasambu Bohm
Wu Li
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Corus UK Ltd
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Corus UK Ltd
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Publication of WO2009059798A2 publication Critical patent/WO2009059798A2/fr
Publication of WO2009059798A3 publication Critical patent/WO2009059798A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • 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
    • C23C2222/20—Use of solutions containing silanes

Definitions

  • the invention relates to a method for producing a coating on a metal substrate and a coating produced thereby for providing temporary protection of the substrate against corrosion.
  • Corrosion is a well-known problem relating to metallic structures, for example steel sections.
  • a number of approaches may be invoked in order to prevent or reduce corrosion.
  • the flow of electrons can be interrupted in that the chemical composition of the materials concerned is changed, or the material to be protected against corrosion is separated from the electrolyte (for example, salty water).
  • the electrolyte for example, salty water.
  • the protective coatings preventing rust formation tend to change the surface chemistry of the substrate in the form of an ultra-thin adhesive layer between the substrate and the protective coating.
  • Protective coatings for steel sections are typically based on paints, organic layers, ceramic and inorganic layers, plastic coatings, and platings with non- rusting metal.
  • protective coatings such as zinc, aluminium-based metal and magnesium-based metal are distinguished by the fact that they have a tendency to corrode more quickly than the surface to be protected (these layers are therefore also termed sacrificial layers).
  • surface passivation layers may be provided to afford permanent protection of a substrate from environmental degradation.
  • Surface passivation may be introduced by the application or production of an oxide layer onto the surface of the substrate.
  • metallic structures such as as-rolled metal sections are transported, in pristine condition, from the Rolling Mill to the customer.
  • Transportation of the sections from source to destination could take from a few to several months, during which short periods, by the time the steel sections reach the customer, surface red rust is formed on the surface of the section.
  • Progressive rusting over a few weeks to a few months of the surface of the section impairs its aesthetic appeal, particularly the pristine mill-scale appearance of as-rolled mill-scale steel sections. While the mechanical properties of the steel are not affected as a result of rusting, the steel surface tends to develop a poor visual appearance by the time steel arrives at the customer, the latter preferring to see the steel surface in its original pristine surface as-manufactured.
  • Coating materials such as petroleum jelly, castor oil and paraffin oil are conventionally used to provide steel surfaces with temporary protection against atmospheric corrosion typically lasting several weeks, especially during transportation and storage.
  • the term 'temporary 1 refers to a coating on the steel, which protects its surface for a few to several months, i.e. for the period between production of the substrate by the producer and the use of the substrate by the customer.
  • a further object is to provide a coating on the steel substrate that is transparent and dry in that the original pristine surface of the steel substrate without rust may be seen when the coated substrate arrives at the customer. Moreover, the surface of the substrate is not slippery so that it can be easily handled. Because steel sections are to be further processed in the factory after being transported, a further object of the invention is to provide a protective coating, which is easily removable during conventional surface preparation operations, without leaving residues. The removed coating should preferably be benign (particularly important with re-circulating blast cleaning operations). Moreover, if the coating remains on the steel surface, it will have to be compatible with any subsequent operations; for example, over-coating, cutting or welding and the coating should have no adverse effect on fabrication and down-stream processing.
  • one or more of these objects may be achieved by providing a method for producing a coating on a metal substrate, comprising the steps of: providing a coating mixture comprising at least one hydrolysable silane-based component and at least one further component wherein the further component comprises a reactive functional group curable with the at least one hydrolysable silane-based component; applying the mixture to the metal substrate; curing the mixture, so as to provide a dense network structure of the coating for temporary protection of the substrate against corrosion.
  • Said method applies a coating to a metal substrate, the green coating comprising a hydrolysable silane component and a further component, characterised in that the further component comprises a reactive functional group curable with the hydrolysable silane component so as to provide a dense network structure of the cured coating for temporary protection of the substrate against corrosion.
  • This combination has the advantage that silane components readily react with further components to provide a three-dimensional network including at least a silane network, which provides temporary protection for the substrate.
  • the cured coating is removable.
  • the term green coating is used to identify the coating which is formed on the metal substrate after the coating mixture has been applied to the substrate and before curing has taken place. After curing, the green coating has become a cured coating.
  • the dry film thickness of the cured coating is preferably between 0 and 20 ⁇ m. Depending on the requirements to the cured coating thinner coatings may be preferable. For (thick) plate, rail or sections a robust and hard coating may be desirable, and this coating preferably has a thickness of over 10 ⁇ m. For wire and strip, a thin and flexible coating is desirable and this coating preferably has a thickness of less than 5 ⁇ m. The minimum thickness of the coating is the thickness wherein the coating can fully cover the surface area. It was found that a minimum thickness of 1 ⁇ m is adequate to achieve this.
  • the silane component comprises tetraethoxysilane (TEOS) and vinylthmethoxysilane (VTMS).
  • the further component in the coating mixture may comprise an aqueous solution of an acid, preferably a nitric or acetic acid solution such that an improved network structure is provided on the substrate.
  • the acid is used to adjust the pH of the coating mixture to catalyse the hydrolysis and condensation of silanes.
  • the coating having a dry film thickness of 2 to 3 microns provides temporary protection of the substrate for up to 6 months. The protection afforded for this period is suitable for longer transit periods where the substrate has to be transported abroad.
  • the coating mixture also comprises one or more of the following compounds:
  • - alcohol such as ethanol and/or butanol
  • the further component comprises a dispersion of nano-scale colloidal particles in water and a corrosion inhibitor.
  • the dispersion of nano-scale silica particles is an aqueous colloidal silica sol product
  • the corrosion inhibitor component is a cerium acetate (Ce(CH 3 COO) 3 ).
  • the cerium acetate also catalyses the curing mechanism.
  • the addition of these further components provides a coating with superior properties such as additional flexibility.
  • the coating mixture comprises 13 to 16 %wt TEOS, 65 to 55 % wt VTMS and 22 to 29 %wt nitric acid solution.
  • the cured coating produced from this coating mixture having a dry film thickness of 2 to 3 microns typically provides temporary protection for the substrate for up to 6 months.
  • the coating mixture comprises 10 to 15 %wt TEOS, 55 to 45 %wt VTMS, 20 to 25 %wt nitric acid solution, 5 to 10 %wt of the dispersion and 0.001 to 0.05 %wt cerium acetate.
  • the cured coating produced from this coating mixture having a dry film thickness of 2 to 3 microns typically provides temporary protection for the substrate for up to 9 months. This level of temporary protection for the substrate is suitable for long transit times abroad and in marine environments.
  • the coatings based on VTMS and TEOS as the only silane based compounds are hard and durable which is important for plate, section or rail applications. In these cases the coating may also be chosen significantly thicker than 3 ⁇ m, e.g. between 10 and 15 ⁇ m.
  • the coating mixture comprises VTMS, TEOS and Ph-TES, wherein VTMS and Ph-TES are present in a ratio in wt% of between 2 and 20, preferably of between 6 and 12, more preferably of about 10.
  • the inventors found that when adding a small amount of Ph-TES to the coating mixture in the said ratio that the corrosion performance of the cured coating is improved. This is believed to be caused by the fact that Ph-TES is a more hydrophobic silane due to the phenyl-group which helps to decrease the diffusion of water through the coating. This type proves to be particularly suitable for coatings which have to be able to withstand high temperatures such as reinforcement wires for embedding in a glass.
  • MTMS methylthmethoxysilane
  • Ph-TES methylthmethoxysilane
  • MTMS is a backbone silane which can partly replace VTMS if so desired.
  • the coating mixture comprises VTMS, TEOS and PTMS, wherein VTMS and PTMS are present in a ratio in wt% of between 2 and 20, preferably of between 6 and 12, more preferably of about 10.
  • the inventors found that when adding a small amount of PTMS to the coating mixture in the said ratio that the corrosion performance of the cured coating is improved and, more importantly, that the flexibility of the cured coating increases considerably. This means that a cured coating produced from this coating mixture is particularly suitable for application to thin substrates like sheet, strip and wire which bend easily and which are cured at low temperatures. It proved to be beneficial to add MTMS to the coating mixture comprising PMTS.
  • the coating mixture comprises titanium isopropoxide and the silane-based components in a ratio in wt% of between 0.1 and 2%, preferably between 0.2 and 1 %, more preferably between 0.3 and 0.7%.
  • This compound was found to be particularly effective in catalysing the curing reaction so that the curing temperature can be reduced. This is particularly relevant for the application of the method in accordance with the invention in processes where a high curing temperature is undesirable because it would constitute an additional process step.
  • a curing temperature (expressed in peak metal temperature) of below 150 0 C or even below 12O 0 C may be achieved.
  • tuning the composition of the coating mixture curing temperatures involving a peak metal temperature of below 100 0 C is achievable.
  • the silane component is a Y- glycidoxypropylthmethoxysilane (GPS) and the further component a solution of Chitosan.
  • the reactive functional group is an amine group. This leads to the formation of a transparent, 3-dimensional Chitosan-silane network, which is flexible and removable by acid pickling.
  • the Chitosan solution comprises a homogeneous mixture of de-ionised water, acetic acid and low molecular weight Chitosan.
  • the solution form of Chitosan enables it to be readily combinable with the other components to provide a network structure.
  • the coating mixture comprises 45 to 55 %wt GPS and 55 to 45 %wt Chitosan solution. This range of components provides a robust network on the substrate, a transparent network and removability of the coating. Favourably, the coating mixture comprises 50 %wt GPS and 50 %wt Chitosan solution.
  • the coating mixture further comprises a vinyltrimethoxysilane (VTMS).
  • VTMS vinyltrimethoxysilane
  • the coating mixture comprises 42 to 56 %wt GPS, 50 to 40 %wt Chitosan solution and 8 to 4 %wt VTMS.
  • This combination of components provides protection of the substrate during transit and permits the removal of the cured coating if desired after transportation.
  • the cured coating is removable from the substrate by shot blasting or pickling. This is important because manufacturers often apply their own coatings or pre-treatment to make the final product.
  • the coating produced using the GPS-Chitosan compounds having a dry film thickness of 2 to 3 microns provides the substrate with temporary protection for up to three months. This is sufficient protection for the substrate for short transit periods often within the same territory. The period of protection is therefore somewhat shorter, but the advantage of this coating is that it is picklable as a result of the presence of the Chitosan.
  • the curing step is preferably incorporated in an existing process step.
  • the choice of the curing temperature depends on the requirements to the cured coating. For applications where no additional heat treatment is desirable, for example in strip production, the use of Ti-isopropoxide allows to reduce the peak metal temperature to below 120 0 C, e.g. about 110 0 C.
  • the curing treatment may be performed by using the heat still present in the steel after rolling, or for example by using an infrared heating device, induction device or any other suitable means. Also, by selecting the proper composition, the coating mixtures can be chosen such that curing can take place at ambient temperatures.
  • silane-based compounds used in the method according to the invention are fluor-free to avoid pollution upon removal of the temporary coating by a blasting or pickling operation.
  • the substrate is cleaned before applying the coating mixture.
  • rolling oil or some adhering scale may cause insufficient adhesion.
  • the cleaning may be performed using conventional cleaning and/or descaling means.
  • a metal substrate is provided with a coating produced in accordance with the method of the invention as described hereinabove having a dry film thickness of 0 to 20 microns.
  • the coating is removable from the substrate by shot blasting or pickling.
  • the coating has a dry film thickness of 2 to 3 microns which provides the substrate with temporary protection for up to three months, preferably for up to 6 months, more preferably for up to 9 months.
  • the substrate is made of steel, and the substrate may be a sheet, plate, section, rail, coiled hot or cold rolled sheet, galvanized sheet, bar, rod or wire. Steels are prone to show red rust, particularly when stored under hot and/or moist conditions.
  • the aforementioned coatings are chemically compatible with steel substrates and provide the steel substrate with an excellent finish. Examples
  • figure 1 shows the structures of Chitosan and ⁇ -Glycidyloxypropyltrimethoxysilane ( ⁇ -GPS).
  • the primary silane-based-compounds used in the embodiments of the invention include ⁇ -GPS, Tetraethoxysilane (TEOS) and Vinyltrimethoxysilane (VTMS).
  • a further chemical component used in the invention includes the Chitosan structure, which is a linear polyamine (poly d-glucosamine) that is entirely soluble in acidic solutions.
  • the method for producing the coatings in accordance with the invention comprises a Silica "Sol-gel” technology including the steps of: mixing at least one hydrolysable silane-based component and at least one further component; applying the mixture on the metal product; and curing the mixture, characterised in that the at least one further component comprises at least a functional group for cross-linking with the at least one hydrolysable silane component so as to provide a dense network structure of the coating for temporary protection the substrate against corrosion.
  • Silica Sol-gel technology has been used to produce uniform, coatings and the advantage of the technology is that coatings with specific properties can be produced for different applications. Silicone alkoxides (silanes) are easily hydrolysed by water. The hydrolysis reaction scheme is shown below with the condensation between the silanol groups and the hydroxyl groups leading the strong Si-O-Si bonds.
  • Transparent glass-like films may be obtained for a fully cured coating.
  • the non- hydrolysable 1 R 1 group is used to adjust the degree of the cross-linking density and subsequently the flexibility of the coating.
  • the characteristics and properties of a particular sol-gel inorganic network are related to a number of factors that affect the rate of hydrolysis and condensation reactions, such as, pH, temperature and time of reaction, reagent concentrations, catalyst nature and concentration, H 2 O/Si molar ratio (R), aging temperature and drying time.
  • Silanes react on steel surfaces to form highly stable covalent Fe-Si and Fe-C bonds, and silanes have the intrinsic characteristics to condense and form a network.
  • the network structure will depend on the chemical nature of the silane and therefore, the network could be tailored for the desired properties.
  • ⁇ -GPS was mixed with a Chitosan solution in the ratios described in the formulations shown in table 1.
  • the Chitosan solution was prepared from 170 mL de-ionised water, 5 ml_ acetic acid and 3.45g Low Molecular Weight
  • Chitosan solution was homogeneous.
  • the components were mixed for at least two hours at room temperature or above (or preferably at 50 0 C or above).
  • the components of the coating were mixed for 16 hours, and the coating mixture was applied by spraying onto mild steel test panels (Grade A -BS 7079: Part A1 ).
  • the coating was applied using a conventional spray coating for applying thin films, for example, on strip substrates.
  • the coating may be applied using a dip process or a dip process with or without squeegee rolls.
  • the coating mixture was cured at room temperature for 2 days; alternatively, it may be cured between 30 seconds and 30 minutes at elevated temperatures.
  • the condition of the substrate surface prior to application of the mixture is important; preferably, the surface of the substrate should be free of contaminants to ensure good wettability and adsorption of the mixture of the silane and Chitosan solution. Good wettability promotes the formation of a uniform coating layer.
  • degreasing of the substrate steel panels was performed using acetone prior to the application of the coating mixture.
  • formulation Y the ratio of GPS to Chitosan was 1 :1 ; in this example, formulation Y comprised 50%wt GPS and 50%wt Chitosan solution.
  • the coating mixture comprised 47.1 %wt Chitosan solution and 5.8%wt VTMS, mixed together for at least ten minutes. This was followed by mixing with 47.1 %wt of GPS. Again the coating was applied using the same methods and conditions described above.
  • Coating Formulations Chemicals in coating formulation (%wt.)
  • Table 1 Coating ratios of Chitosan to silane in formulation X and Y. The coatings were tested in respect of their ability to be removed from the substrate and to assess the period of time the coatings protected the steel panels against rusting.
  • formulation X and formulation Y with a 2-4 micron DFT were still protecting the panels from rusting. Based on the above results, it was decided to check the corrosion protection of the formulations X&Y applied to mild steel sections. Samples of sections were cut from a single bar. Half of each section was sprayed, while the other half was left free of protection as a reference.
  • compositions of the formulations (formulation 1 and 2) of the invention are summarised in Table 2 below.
  • the invention utilises the hydrolysis function of silanes to form part of the network structure of the protective coatings.
  • formulation 1 (see table 2) comprised 14.8 %wt TEOS, 59.1 %wt VTMS and 26.1 %wt nitric acid solution.
  • TEOS is a silane compound with the chemical structure (CH 3 CH 2 O) 4 Si.
  • the nitric acid solution (H 2 O/HNO 3 ) provides for hydrolysis of the silane components.
  • Levasil ® 200E -20% is a registered trade name of H. C. Starck and it is an aqueous colloidal dispersion of amorphous silica. These are silica nano-particles and are an aqueous colloidal silica sol product - essentially a stable dispersion of nano-scale glass particles in water.
  • Levasil ® 200E -20% was incorporated into the coating formulation to reinforce the hardened silane network and improve its barrier properties. The applicability of the method is not restricted to the Levasil ® 200E -20% materials.
  • Cerium acetate is a salt which plays two roles in the temporary protective coating. Firstly, it catalyses gelling of the silane/silica sol network and secondly, it is a highly effective corrosion inhibitor.
  • the rare earth salt solution was prepared by dissolving 1 g of cerium acetate in 4 ml of 3x10 "3 M nitric acid solution. The curing mechanism of this formulation at room temperature is provided by catalysis via the rare earth salt accelerator.
  • formulation 1 The components of formulation 1 were mixed together for a period of 15 hours, and the formulation was applied on the steel panel by conventional spraying (as described above) on a pre-heated steel test panel.
  • the panel was exposed to a thermal pre- treatment at temperatures between 50 and 100 degrees, preferably 70-80 degrees.
  • the coating may be applied using a dip process or a dip process with or without squeegee rolls. These application methods can be used for each of the coating mixtures in accordance with the invention.
  • the DFT of the coating on the steel panel was tested, the thickness of the coating being 2-3 microns.
  • the corrosion protection was similarly experimented upon as described above for the first set of experiments relating to the silane-Chitosan coatings of the invention.
  • formulation 1 demonstrated up to six months corrosion protection and a high resistance to scratch; therefore high robustness was imparted by the coating. Moreover, the protective coating was removable by shot blasting without contamination thereby rendering it amenable to further processing steps.
  • formulation 2 comprised 12.8% of TEOS, 51.1 %wt of VTMS, 23.4 %wt of nitric acid solution and further having a dispersion of nano-scale silica particles in water and a corrosion inhibitor component having catalytic properties, the corrosion inhibitor preferably being cerium acetate.
  • the latter two components were present in the amounts 8.5 %wt of nano-silica particles and 0.005 wt % of cerium acetate.
  • formulation 2 The components of formulation 2 were mixed together for 15 hours, preferably between 10 to 20 hours, and the formulation was applied on the steel panel by spraying on a preheated surface.
  • the pre-treatment temperatures were 50 to 100 degrees, preferably 70 to 80 degrees.
  • the dry film thicknesses (DFT) of the coating on the steel panel was tested, the thickness of the coating being 2 to 3 microns. Evaluation of the extent of corrosion protection was similarly experimented upon as described above for the first set of examples of the invention. Tests on formulation showed up to nine months corrosion protection and manifested favourable durability. Moreover, the protective coating prepared from formulation 2 was removable for the panels by shot blasting without contamination. The latter feature rendering the panel amenable to further processing steps such as hot dip galvanising. It is thought that, because the TEOS structure has no organic side group and VTMS has a small side group, the result is that a much denser silicate network was obtained. To produce a temporary coating with an even further improved corrosion resistance and a better flexibility the formulations in accordance with table 3 were produced. It will be obvious that for large quantities of the coating mixture the amounts given in table 3 must be suitably increased.
  • Ti-ip in table 3 allows a curing treatment with a peak metal temperature as low as 110 0 C. It was found that a level of about 0.5% in relation to the total silane content was adequate to achieve this.
  • the amount of titaniumisopropoxide between e.g. 0.3 and 0.7 the required PMT can be influenced. Both the PTMT-type as the Ph-TES-type showed good corrosion performance.
  • the pH is adjusted to about 2, in this example by the use of nitric acid.
  • aqueous colloidal dispersion of amorphous silica could be added to the coating mixtures presented in table 3.
  • the pH value of the colloidal silica Levasil® 200E 20% was first adjusted to 2 after which the MTMS and Ph-TES was added slowly while stirring, which then was diluted by iso-propanol at 1 :1 ratio.
  • Iso-propanol is added to increase the stability of the sol, and thereby increase the pot-life of the solution.
  • iso-propanol 2-butanol is used in some coating mixtures. Both have the same functionality, used as solvent and can be replaced by other organic solvents as well.
  • Table 3 Composition of temporary protective coating formulations comprising PTMS or Ph-TES.
  • Ph-TES type with colloidal silica The pH value of colloidal silica Levasil 200E 20% was first adjusted to 2 by adding 20% nitric acid. Then MTMS and Ph-TES were added slowly into the colloidal silica solution under stirring. The mixture was then diluted by iso-propanol at a 1 :1 ratio. 0.5 mm thick wire was cleaned by acetone and then dipped into the hybrid sol-gel solution. The wet coatings were cured at 300 0 C for 60 seconds.
  • PTMS type VTMS/TEOS + 10% PTMS with 0.5%
  • Ti Figure 4 shows an uncoated (a.) and coated section (b.) with the above formulation, after 10 weeks exposure in industrial environment.
  • the uncoated section shows large amounts of red rust, whereas the coated section still shows the as-rolled condition.
  • This type is especially suitable for the coating of strips, particularly steel strip, because it is flexible, offers good corrosion resistance and cures at low temperatures.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

L'invention porte sur un procédé de fabrication d'un revêtement durci sur un substrat métallique. Ce procédé consiste à : se procurer un mélange de revêtement comprenant au moins un composant à base de silane hydrolysable et au moins un autre composant, dans lequel l'autre composant comprend un groupe fonctionnel réactif durcissable avec le composant à base de silane hydrolysable ; appliquer le mélange sur le substrat métallique ; faire durcir le mélange, de façon à fournir une structure de réseau dense du revêtement durci pour une protection temporaire du substrat contre la corrosion. L'invention porte également sur un substrat revêtu doté d'un revêtement obtenu par le procédé selon l'invention.
PCT/EP2008/009475 2007-11-08 2008-11-10 Procédé de fabrication d'un revêtement sur un substrat métallique et revêtement obtenu par ce procédé Ceased WO2009059798A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07120293 2007-11-08
EP07120293.1 2007-11-08

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WO2009059798A2 true WO2009059798A2 (fr) 2009-05-14
WO2009059798A3 WO2009059798A3 (fr) 2009-07-09

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Cited By (16)

* Cited by examiner, † Cited by third party
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DE102011084183A1 (de) 2011-03-25 2012-09-27 Evonik Degussa Gmbh Wässrige Korrosionsschutzformulierung auf Silanebasis
WO2013054064A1 (fr) * 2011-10-14 2013-04-18 Université Paul Sabatier Toulouse Iii Procédé de traitement anticorrosion d'un substrat métallique solide et substrat métallique solide traité susceptible d'être obtenu par un tel procédé
WO2014138874A1 (fr) * 2013-03-15 2014-09-18 Vanchem Performance Chemicals Revêtements contenant du silane
WO2015128364A1 (fr) * 2014-02-28 2015-09-03 Tata Steel Uk Limited Procédé de production d'un substrat métallique revêtu de siloxane et substrat métallique revêtu de siloxane ainsi obtenu
CN106311157A (zh) * 2016-08-31 2017-01-11 安徽东锦服饰有限公司 一种具有吸附作用复合膜的制备方法
EP3398998A1 (fr) 2017-05-03 2018-11-07 Evonik Degussa GmbH Composition sol/gel aqueuse en tant que précurseur stable au stockage pour des primaires riches en zinc
US20180352857A1 (en) * 2017-06-12 2018-12-13 Altria Client Services Llc Corrosion-resistant reservoir for an e-vaping device and method of manufacturing thereof
EP3408334B1 (fr) 2016-01-29 2020-05-13 Tata Steel UK Limited Procédé pour protéger des produits en acier traités à chaud contre l'oxydation et la décarburation
CN114074062A (zh) * 2020-08-18 2022-02-22 宝山钢铁股份有限公司 热轧带钢暂时性防护层的连续生产方法及热轧带钢
CN115232490A (zh) * 2022-08-08 2022-10-25 杭州老板电器股份有限公司 一种用于抽油烟机的疏水疏油涂层材料及其制备方法和应用
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CN115820140A (zh) * 2022-12-26 2023-03-21 上海孚加新材料科技有限公司 一种免擦拭焊接薄膜及其制备方法
WO2025002511A1 (fr) * 2023-06-27 2025-01-02 Technische Universität Bergakademie Freiberg, Körperschaft des öffentlichen Rechts Composition pour le revêtement de surfaces de substrat
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