WO2020160531A1 - Procédés et compositions pour une adhérence améliorée de revêtements organiques à des matériaux - Google Patents

Procédés et compositions pour une adhérence améliorée de revêtements organiques à des matériaux Download PDF

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Publication number
WO2020160531A1
WO2020160531A1 PCT/US2020/016356 US2020016356W WO2020160531A1 WO 2020160531 A1 WO2020160531 A1 WO 2020160531A1 US 2020016356 W US2020016356 W US 2020016356W WO 2020160531 A1 WO2020160531 A1 WO 2020160531A1
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pulse
reactive metal
hours
unsubstituted
substituted
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PCT/US2020/016356
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English (en)
Inventor
John D. WATKINS
Hunaid B. NULWALA
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Lumishield Technologies Incorporated
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Priority to US17/427,345 priority Critical patent/US20220127744A1/en
Publication of WO2020160531A1 publication Critical patent/WO2020160531A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • C25D9/10—Electrolytic coating other than with metals with inorganic materials by cathodic processes on iron or steel
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes

Definitions

  • Metal surfaces are known to be susceptible to corrosion which can result in the degradation of the structural integrity and appearance of the underlying metal.
  • organic coatings e.g., organic lining and sheeting, hot melt coatings, laminates, paints, enamels, varnishes, lacquers, dispersion coatings, emulsion coatings, powder coatings, and latex coatings
  • organic coatings use many different types of polymers (e.g., epoxies, phenolics, acrylates, latexes, urethanes and fluorinated polymers).
  • An organic surfaced treatment may contain many different layers comprising the organics coatings listed above, as well as inorganic coatings.
  • the base organic layer near to the metal surface is referred to as the primer layer.
  • the primer layer increases polarity as well as provide additional binding sites for the top organic layers to adhere.
  • polymer used as primer includes, polyetherimine (PEI); ethylene acrylic acid (EAA); but for metals epoxy-based primers are heavily used.
  • PEI polyetherimine
  • EAA ethylene acrylic acid
  • poly(urethane) are also used for metals organic coatings as well.
  • Epoxy organic coatings are used to coat metal surfaces and provide resistance to chemical corrosion, physical resistance to the environment, and a uniform appearance. Such epoxy coatings are often applied to, for example, on ships and chemical storage tanks. In general, epoxy resins are formed by the opening of the epoxy ring.
  • Pigments are used to provide color and corrosion resistance to organic coatings and include organic pigments, (e.g., azo-, phthalocyanine and anthraquinone derivatives), inorganic pigments (e.g., white titanium dioxide (titanium(IV) oxide)), iron oxides (black, yellow and red), zinc oxide and carbon black. Powdered metals (e.g., zinc and zinc phosphate) can also be used to inhibit corrosion.
  • organic pigments e.g., azo-, phthalocyanine and anthraquinone derivatives
  • inorganic pigments e.g., white titanium dioxide (titanium(IV) oxide)
  • iron oxides black, yellow and red
  • Powdered metals e.g., zinc and zinc phosphate
  • a single protective coat may not provide sufficient corrosion resistance to metal surfaces.
  • a multi-stacked polymer approach can be used, with multiple pre treatments, primers top-coats and clear coats. This combination of layers can improve adhesion, wear resistance and corrosion resistance, but can also add substantial weight to the material.
  • aspects described herein provide methods and compositions for improving adhesion of an organic coating applied to a surface of at least one conductive substrate, by electrodepositing at least one reactive metal-based deposit on a conductive substrate by pulse electrochemical reduction of a metal complex dissolved in a substantially aqueous medium, and applying an organic coating to a surface of the reactive metal-based deposit.
  • less than about 1mm scribe creep is detected up to about 250 hours after a salt spray exposure.
  • Further aspects provide methods and compositions for improving adhesion of an organic coating applied to a surface of at least one conductive substrate by electrodepo siting at least one reactive metal-based deposit on a substrate by pulse electrochemical reduction of a metal complex dissolved in a substantially aqueous medium wherein the pulse electrochemical reduction comprises a pulse scheme comprising of a series of sequential pulses having current densities from about 5 to about 100 mA/cm 2 , and applying an organic coating to a surface of the reactive metal-based deposit.
  • Yet further aspects provide methods and compositions for improving corrosion resistance of a conductive substrate by electrodepositing at least one reactive metal-based deposit on the conductive substrate by pulse electrochemical reduction of a metal complex dissolved in a substantially aqueous medium, and applying an organic coating to a surface of the reactive metal-based deposit wherein less than about 1mm scribe creep is detected up to about 250 hours after a salt spray exposure.
  • Figure 1 shows an exemplary comparison between the industry standard method of applying epoxy coatings to a steel surface (left panel, Industry Standard) and an example of the methods described herein (right panel, LumiShield coating);
  • Figures 2A and 2B show baseline control panels consisting of an industry standard iron phosphate treatment on steel panels (e.g., as shown in Figure 1, left panel) with epoxy powder-coated top-coat, tested before (Figure 2A) and after (Figure 2B) 250 hours of salt spray exposure;
  • Figure 3 shows exemplary scribe creep results following epoxy coating on LumiShield aluminum oxide tested after 250 hours of salt spray exposure use (A) Pulse 1 scheme, (B) Pulse 2 scheme, and (C) 25 mA/cm 2 DC for 15 minutes each;
  • Figures 4A and 4B show exemplary baseline control panels consisting of an industry standard iron phosphate treatment on steel panels with epoxy powder-coated top-coat, tested after 500 hours of salt spray exposure;
  • Figure 5 shows exemplary scribe creep results following epoxy coating on LumiShield aluminum oxide tested after 500 hours of salt spray exposure use (A) Pulse 1 scheme, (B) Pulse 2 scheme, and (C) 25 mA/cm 2 DC for 15 minutes each; [0018] Figures 6A and 6B show exemplary baseline control panels consisting of an industry standard iron phosphate treatment on steel panels with epoxy powder-coated top-coat, tested after 1000 hours of salt spray exposure;
  • Figure 7 shows exemplary scribe creep results following epoxy coating on
  • LumiShield aluminum oxide tested after 1000 hours of salt spray exposure use (A) Pulse 1 scheme, (B) Pulse 2 scheme, and (C) 25 mA/cm 2 DC for 15 minutes each;
  • Figure 8 shows an exemplary comparison of scribed salt spray testing (ASTM D1654) of differently colored coating layers with a polyurethane topcoat with scribe adhesion testing after 1000 hours of exposure;
  • Figure 9 shows exemplary morphology variations with DC current density using conditions in Table 5 and tested by visual microscopy and organic coating delamination at 1000 hours after salt spray exposure;
  • Figure 10 shows exemplary morphology of coated steel panels with adhesion of ceramic loaded epoxy paint
  • Figure 11 shows the results of an exemplary pulse electrochemical reduction using and aluminum oxide plating bath on 3” x 6” 1010 cold rolled mild steel test panels.
  • the thickness of organic layers is integrally linked to overcoming defects, both application defects and materials defects. Insufficient adhesion at defects from improper application, pinhole formation, or physical damage can severely limit the lifetime of paint and can lead to premature corrosion of substrates.
  • a pretreatment method that increases forgiveness of these defects, where pinholes do not lead to widespread corrosion is provided. Thus, even in situations where organic coatings cannot be entirely removed, they may be reduced in thickness for cost and weight savings without generating defects that can lead to premature failure.
  • prior methods of coating steel utilize a phosphate pretreatment followed by an epoxy primer and a polyurethane topcoat.
  • Industry standard treatment for painted steel utilizes physical preparation of the surface by, for example, grit blasting or a chemical treatment such as phosphating.
  • these methods do not provide satisfactory results after, for example, 250 hours following salt spray exposure.
  • Methods and composition described herein can eliminate (1) phosphate pre treatment which generates toxic waste streams and uses harsh application practices, (2) grit blasting and manual preparation of surfaces, and (3) use of primer layers.
  • the compositions described herein can be applied directly between bare metal and top-coats.
  • coating compositions described herein comprise and electroplated coating whose surface morphology, thickness and porosity may be manipulated by changing current density, pH, electrolyte concentration/identity, reactive metal identity from aluminum, magnesium, titanium, niobium, manganese, zirconium, metal concentration, metal ratio and pulse scheme.
  • the coating composition can comprise aluminum salt (e.g., 0.34M), zirconium salt (e.g., 0.1M), and NH4CI (e.g., 0.48M), at a pH of about 3.0 (e.g., 2.9-3.3) and used at a temperature of about 18-20 degrees C.
  • the plating solution can be made from concentrates of aluminum and zirconium salt can be made by reacting of metal carbonate with a suitable acid (e.g., electron withdrawing ligands as described herein), under stirring and chilling until the desired solution concentrate in DI water is reached.
  • a suitable acid e.g., electron withdrawing ligands as described herein
  • the plating solution is synthesized from a 0.7M concentrate of aluminum salt and a 2M concentrate of zirconium salt.
  • these components can be first diluted to 0.34 M and 0.1 M respectively with DI water, then an additional supporting electrolyte, ammonium chloride, is added at a concentration of 0.5M and the final pH adjusted to between 2.9 and 3.3 by the addition of hydrochloric acid.
  • the solution can be circulated and left to equilibrate for 8 hours prior to use after which the pH can be maintained between 2.9 and 3.3.
  • a thermostat coil can be used with an external recirculation to maintain temperature in the bath between 18 and 20°C for operation.
  • a custom mixed metal oxide electrode can be used as the counter electrode and is designed to produce oxygen during the plating process.
  • the steel coupon is first cleaned by an electro-cleaning process in a soap solution at 5V, followed by an acid activation step in a 20% hydrochloric acid solution and a DI rinse step prior to plating. After plating is complete the sample can be rinsed in DI water, forced air dried to remove surface water, and finally dried in a convection over at 160°C for 2 hours. Alternate methods can be used. Such methods and compositions are described, for example, in WO2017142513 and WO2018222977, hereby incorporated by reference in their entirety.
  • the coating composition is porous in nature, with thickness and porosity controllable by variation of solution and process conditions.
  • Controllable conditions include pH, aluminum salt concentration. Methods described herein can control, for example, current density, plating time, pulse sequence, cathode to anode ratio.
  • the coating composition has native hydroxide surface functionalization that can be detected by ATR IR (attenuated total reflectance infrared.
  • the surface hydroxides can be further functionalized by the application of silanes by a spray or dip process in a carrier solution such as alcohols or other organics.
  • a carrier solution such as alcohols or other organics.
  • the adhesion of polyurethane, phenolics, fluoropolymers and epoxy can be improved using the coating compositions and methods using either onto the hydroxide functionality of the applied coating composition or via a functionalized silane linkage.
  • the coating compositions can be used on a conductive substrate to enhance surface properties and corrosion resistance (e.g., carbon, steel, iron, nickel, conductive plastics).
  • a conductive substrate e.g., carbon, steel, iron, nickel, conductive plastics.
  • Aluminum oxide coating compositions described herein can be used as a surface treatment for the attachment of silane functionality to enhance surface properties (e.g., hydrophobicity, icephobicity, corrosion resistance, abrasion resistance, adhesion to additional substrates).
  • compositions described herein can be further impregnated with functional organic and inorganic materials such as dyes to manipulate properties such as appearance, corrosion resistance, surface lubricity.
  • the coating compositions can be used as a surface treatment for the covalent attachment of polymer top-coats including polymers from families: polyurethane (e.g. TCI 8810-9074), epoxy (e.g. Cardinal Industry Finishes E305 -WH243), phenolic (e.g. Heresite P-413), fluoropolymer (e.g. Arkema Kynar and Aquatec products).
  • polyurethane e.g. TCI 8810-9074
  • epoxy e.g. Cardinal Industry Finishes E305 -WH243
  • phenolic e.g. Heresite P-413
  • fluoropolymer e.g. Arkema Kynar and Aquatec products.
  • the surface bound polymers retain high adhesion through the LumiShield coating to the base conductive substrate with hardness and adhesion comparable to phosphate and primer technologies.
  • exemplary coated materials described herein do not suffer delamination through scribed salt spray exposure (ASTM D1654) with adhesion and surface properties such as hydrophobicity preserved during corrosion testing.
  • exemplary coated samples described herein do not require additional priming from epoxy-based primers or other primers prior to top-coat application either for adhesion or corrosion resistance.
  • exemplary coated samples described herein improve adhesion to many types of organic coatings. Commonly, organic primer layers are used for improved corrosion resistance and top-coat adhesion.
  • pretreatment aspects described herein can replace the need for such primers by improving direct adhesion of metal surfaces to top-coats. Through this enhanced adhesion, corrosion resistance is also improved, rendering the need for functional primers in such cases unnecessary.
  • This pretreatment for example, can be used to replace epoxy primers by direct application of polyurethane top-coats to the metal surface.
  • silane seal layer may be applied by standard silane application techniques such as spray coating and dip-coating using a carrier solvent such as alcohols or water and may be used with a silane content of 0.1 to 5 wt% (weight percent).
  • polymer top-coats described herein may be applied by painting, spraying, or powder coating using techniques known to the industry with no modification of the top-coating process.
  • aspects described herein provide methods and compositions for improving adhesion of an organic coating applied to a surface of at least one conductive substrate, by electrodepositing at least one reactive metal-based deposit on a conductive substrate by pulse electrochemical reduction of a metal complex using a pulse scheme, wherein the metal complex is dissolved in a substantially aqueous medium, and applying an organic coating to a surface of the reactive metal-based deposit.
  • less than about 1mm scribe creep is detected up to about 250 hours after a salt spray exposure.
  • “adhesion,” as used herein, refers to the strength of association between two materials whether through chemical bonds (covalent, hydrophobic, electrostatic, etc.), magnetic or other forces.
  • “adhesion” can refer to the degree to which an organic coating is associated with or bound to a substrate.
  • conductive substrate refers to a material that allows the flow of electric charge and is a material that is desirable to protect from adverse effects such as delamination or corrosion.
  • Electrodeposition or“electrodepositing” refers to the deposition of metals (e.g., reactive metals) or other substances from a solvent by means of electricity on to a substrate.
  • reactive metal-based deposit refers to a deposit, typically an oxide, formed with a reactive metal (e.g., aluminum).
  • pulse electrochemical reduction refers to an electrochemical reduction reaction that occurs in a short burst or pulse of current.
  • substantially aqueous medium refers to a solution that comprises mostly (e.g., greater than or equal to about 50%) of an aqueous solvent (e.g., water).
  • aqueous solvent e.g., water
  • scribe creep refers to the quantitative measurement in mm of the degree of removal of organic coating from a cut through the coating to the base material when exposed to corrosive conditions and removal is achieved by the scraping action of a dull blade (see, e.g., ASTM D1654).
  • the pulse scheme comprises at least one individual pulse. In another aspect, the pulse scheme comprises a plurality of pulses.
  • the term“pulse scheme” refers to a series of one or more pulses of current.
  • the first pulse scheme can comprise a first pulse and further comprise a plurality of pulses (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 50, 100 etc.).
  • the current density of the first pulse and the plurality of pulses can be, for example, from about 5 to about 100 mA/cm 2 , 15 to 60 mA/cm 2 , or 25 to 55 mA/cm 2 .
  • less than 1 mm of scribe creep is detected up to about 500 hours after a salt spray exposure and less than 2 mm of scribe creep is detected up to about 1000 hours after a salt spray exposure.
  • the reactive metal-based deposit comprises a reactive metal selected from the group consisting of zirconium, aluminum, titanium, manganese, gallium, vanadium, and niobium.
  • the organic coating is selected from one or more of epoxy, phenolic resin, polyurethane, polyester, and fluoropolymer of blends thereof.
  • the conductive substrate comprises a material selected from the group consisting of carbon, steel, iron, nickel, conductive plastics, and magnesium alloy.
  • the metal complex comprises an electron withdrawing ligand (e.g., sulfonate ligands, sulfonamide ligands, sulfonamide ligands (e.g.,
  • the sulfonate ligands can include OSO2R 1 , wherein R 1 is halo, substituted or unsubstituted Ce-Cis-aryl, substituted or unsubstituted Ci-C 6 -alkyl, or substituted or
  • the sulfonimide ligands can include N SC R 1 ) ! , wherein R 1 is halo; substituted or unsubstituted Ce-Cis-aryl; substituted or unsubstituted Ci-C 6 -alkyl; and substituted or unsubstituted C 6 -Cis-aryl- Ci-C 6 -alkyl.
  • the carboxylate ligands can include ligands of the formula R 1 C(0)0-, wherein R 1 is halo; substituted or unsubstituted Ce-Cis-aryl; substituted or unsubstituted Ci-C 6 -alkyl; and substituted or unsubstituted C 6 -Ci 8 -aryl-Ci-Ce-alkyl.
  • the electron withdrawing ligand can be selected from the group consisting of:
  • R 1 is selected from the group consisting of F or CF3.
  • the substrate is steel
  • the reactive metal-based deposit comprises aluminum oxide
  • the organic coating is selected from one or more of polyurethane and epoxy.
  • Further aspects provide methods and compositions for improving adhesion of an organic coating applied to a surface of at least one conductive substrate by electrodepo siting at least one reactive metal-based deposit on a substrate by pulse electrochemical reduction of a metal complex dissolved in a substantially aqueous medium, the pulse electrochemical reduction comprising a pulse scheme having at least one pulse, wherein the at least one pulse has a current density from about 5 to about 100 mA/cm 2 , and applying an organic coating to a surface of the reactive metal-based deposit.
  • Yet further aspects provide methods and compositions for improving corrosion resistance of a conductive substrate by electrodepositing at least one reactive metal-based deposit on the conductive substrate by pulse electrochemical reduction of a metal complex using a pulse scheme of a metal complex, wherein the metal complex is dissolved in a substantially aqueous medium, and applying an organic coating to a surface of the reactive metal-based deposit wherein less than about 1mm scribe creep is detected up to about 250 hours after a salt spray exposure.
  • the pulse electrochemical reduction comprises a first pulse scheme having a first pulse comprising a current density from about 5 to about 100 mA/cm 2 .
  • the reactive metal-based deposit can comprise a reactive metal selected from the group consisting of zirconium, aluminum, titanium, manganese, gallium, vanadium, and niobium.
  • the organic coating can be selected from one or more of epoxy, phenolic resin, polyurethane, polyester, and fluoropolymer of blends thereof.
  • the conductive substrate can comprise a material selected from the group consisting of carbon, steel, iron, nickel, and conductive plastics.
  • the metal complex comprises an electron withdrawing ligand.
  • Coating morphology can be varied by varying the current density and timing of a series of pulses in what is referred to herein as a“pulse scheme.”
  • the adhesion of paint to a surface can be measured by both tape testing (ASTM D3359)(ASTM D3359-17, Standard Test Methods for Rating Adhesion by Tape Test, ASTM International, West Conshohocken, PA, 2017, www.astm.org) and scribed salt spray adhesion testing (ASTM D1654)(ASTM D1654- 08(2016)el, Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments, ASTM International, West Conshohocken, PA, 2016, www.astm.org).
  • the differences in adhesion can be attributed, for example, to changes in surface morphology, with color being one indication of a change in thickness and platelet structure of the surface.
  • a range of applied pulse schemes for aluminum oxide depositions was used, and showed variations in coating morphologies.
  • Alesta 61 Grey Epoxy powder coating was applied to a surface followed by curing at 190°C.
  • the plates were then tested for adhesion before being scribed and exposed to ASTM B 117 salt spray conditions. Samples were removed after 250 hours, 500 hours and 1000 hours without resubmission to determine the adhesive differences in the powder coat after corrosion.
  • the samples were benchmarked against a paint adhesion standard iron phosphate pretreatment, common to the industry.
  • Each of these groups was scribed per ASTM D1654 and submitted for salt spray exposure (ASTM B117). This is a standard test for determining quantitative corrosive delamination through measurement of‘scribe creep’ the defined as the average distance away from the scribe line that organic coating can be removed from the panel by action of a dull knife. This test is common in characterization of adhesion of paints to metals, and provides data regarding corrosion resistance of the panel, as well as the ability of the pretreatment to improve adhesion of the organic coating under corrosive conditions.
  • Figures 2A and 2B show control panels consisting of an industry standard iron phosphate treatment on steel panels with epoxy powder-coated top-coat, tested before and after 250 hours of salt spray exposure.
  • the standard coating pretreatment shown in Figures 2A and 2B is based on an iron phosphate substrate treated with an epoxy powder coating.
  • the baseline control panels showed significant delamination of organic coating after only 250 hours of exposure with an average scribe creep of 2.7mm ( Figure 2B). This level of scribe creep constitutes a test failure, and would lead to significant corrosion of the underlying steel in a real operating condition.
  • Figure 3 provides the results of epoxy coating on the LumiShield aluminum oxide coating composition tested after 250 hours of salt spray exposure at (A) Pulse 1, (B) Pulse 2 and (C) 25 mA/cm 2 DC for 15 minutes each. As shown in Figure 3, at 250 Hours of salt spray exposure, all aluminum oxide coated panels show less than 1 mm of scribe creep or paint delamination.
  • Table 1 Summary of scribe creep results from plates in Figure 3 for (A) Pulse 1, (B) Pulse 2, and (C) DC and control plates measured after 250 hours of salt spray exposure (ASTM B117) and tested via methods in ASTM D1654.
  • Figures 4A and 4B show control panels consisting of an industry standard iron phosphate treatment on steel panels with epoxy powder-coated top-coat, tested before and after 500 hours of salt spray exposure. After 500 hours of salt spray exposure plates were again tested for delamination and corrosive attack. Control panels now show even more scribe creep delamination as corrosion can further spread and damage the plates.
  • Figure 5 provides the results of epoxy coating on the LumiShield aluminum oxide coating composition tested after 500 hours of salt spray exposure at (A) Pulse 1, (B) Pulse 2 and (C) 25 mA/cm 2 DC for 15 minutes each.
  • the aluminum oxide coated plates show some differences in adhesive performance. Plates coated by Pulse 1 show almost no delamination detected at 250 and 500 hours of exposure. Pulse 2 starts to show some isolated sites of delamination particularly around the intersection point of the X-scribe. The DC coated panels now show the beginnings of the delamination at the x-scribe. None of the tests at 500 hours of salt spray exposure constitute a coating failure for ASTM D1654 using the
  • FIG. 1 Summary of scribe creep results from plates in Figure 5 for (A) Pulse 1, (B) Pulse 2, and (C) and control plates measured after 500 hours of salt spray exposure (ASTM B 117) and tested via methods in ASTM D1654.
  • Figures 6A and 6B show control panels consisting of an industry standard iron phosphate treatment on steel panels with epoxy powder-coated top-coat, tested before and after 1000 hours of salt spray exposure. After 1000 hours of salt spray exposure, significant corrosion and delamination is found in the control panels.
  • Figure 7 provides the results of epoxy coating on the LumiShield aluminum oxide coating composition tested after 500 hours of salt spray exposure at (A) Pulse 1, (B) Pulse 2 and (C) 25 mA/cm 2 DC for 15 minutes each. As shown in Figure 7, the LumiShield aluminum oxide coating showed significant improvement compared to the control panels (see Table 4 below).
  • Table 4 compares the percentage of improvement in each case versus the industry standard coating. In the case of Pulse 1 coated panels, a 97% improvement after 500 hours in performance is found for the LumiShield coated panels compared to control panels, and shows the biggest improvement.
  • Table 4 Summary data for each plating condition compared with the industry standard control plates.
  • the aluminum oxide coating grows, it goes through multiple phases, each with a characteristic color attributed to refractive changes in the growth morphology.
  • the color is indicative of the changing morphology and thickness.
  • Figure 9 shows morphology variations with DC current density using conditions in Table 5 and tested by visual microscopy and paint delamination at 1000 hours of salt spray exposure.
  • Figure 10 shows plates coated with aluminum oxide pretreatment both with and without epoxy silane post-treatment.
  • plates A and B no post-treatment was used other than drying.
  • plates C and D an epoxy silane was sprayed onto the coating to enhance adhesion to the epoxy paint as a post-treatment. All six plates were compared in adhesion by using the cross- hatch adhesion method (ASTM D3359).
  • ASTM D3359-17 Standard Test Methods for Rating Adhesion by Tape Test, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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Abstract

L'invention concerne des procédés et des compositions pour améliorer l'adhérence d'un revêtement organique appliqué à une surface d'un substrat conducteur. Dans des aspects décrits, au moins un dépôt à base de métal réactif est électrodéposé sur un substrat conducteur par réduction électrochimique par impulsions d'un complexe métallique à l'aide d'un schéma d'impulsions, le complexe métallique étant dissous dans un milieu sensiblement aqueux.
PCT/US2020/016356 2019-02-01 2020-02-03 Procédés et compositions pour une adhérence améliorée de revêtements organiques à des matériaux WO2020160531A1 (fr)

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