# US 11,028,275 B2 · Development of a sol-gel anticorrosion treatment

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- Number: US 11,028,275 B2
- Document ID: US11028275B2
- Status: Granted
- Kind: B2
- Application number: 16/076,508
- Filed: 2017-02-09
- Published: 2019-03-21
- Granted: 2021-06-08
- Earliest claimed: 2016-02-09
- Assignees: Safran; Rbnano; Safran Landing Systems
- Applicants: Safran; Rbnano; Safran Landing Systems
- Inventors: Jean-Baptiste Cambon; Julien Esteban; Roland Rodrigue Mafouana; Jean-Philippe Ruetsch
- Web page: https://patentgrep.com/patent/US11028275B2

## CPC

- C09D 5/084: {Inorganic compounds}
- B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23)
- C09D 5/08: Anti-corrosive paints
- C09D 7/20: Diluents or solvents
- C09D 7/43: Thickening agents
- C09D 7/61: inorganic
- C09D 7/70: {characterised by shape, e.g. fibres, flakes or microspheres}
- C09D 139/06: Homopolymers or copolymers of N-vinyl-pyrrolidones
- C23C 18/122: {Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes}
- C23C 18/1241: {Metallic substrates}
- C23C 18/1254: {Sol or sol-gel processing}
- C23C 18/127: {Preformed particles}
- C23C 18/1295: {with after-treatment of the deposited inorganic material}
- C23C 26/00: Coating not provided for in groups C23C2/00 - C23C24/00
- C08K 3/046: {Carbon nanorods, nanowires, nanoplatelets or nanofibres}
- C08K 5/5435: containing oxygen in a ring
- C08K 2003/0806: {Silver}
- C08K 2003/085: {Copper}
- C08K 2201/001: Conductive additives
- C08K 2201/011: Nanostructured additives
- C23C 2222/20: Use of solutions containing silanes
- 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 (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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 (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The invention relates to a process for treating a metal alloy part, characterized in that it comprises the following steps: —producing a stock formulation by mixing, in equal molar parts of silicon, an alcoholic solution of hydrolysed epoxysilane and an alcoholic solution of hydrolysed aminosilane, —mixing the stock formulation with a suspension comprising conductive nanowires in an amount by weight of between 0.1% and 10% relative to the total weight of the stock formulation in order to obtain a dilute formulation, and —depositing the dilute formulation on the part in order to obtain the coating.

## Claims

### Claim 1

A treatment process for a metal alloy part comprising the following steps:
produce a stock formulation by mixing, in equal molar parts of silicon, an alcoholic solution of hydrolyzed epoxysilane and an alcoholic solution of hydrolyzed aminosilane,
mix the stock formulation with a suspension comprising conductive nanowires in an amount by weight between 0.1% and 10% based on the total weight of the stock formulation to obtain a dilute formulation, and
deposit the dilute formulation on the part to obtain the coating,
wherein the stock formulation further comprises fluorosilane, at a molar concentration between 0.5% and 5% based on the silicon derived from the epoxysilane and from the aminosilane and/or from the nanometric silica, at a molar concentration between 1% and 5% based on the silicon derived from the epoxysilane and from the aminosilane.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the conductive nanowires comprise silver nanowires, carbon nanowires and/or copper nanowires.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the conductive nanowires comprise silver nanowires, the suspension of silver nanowires being produced by centrifugation of a suspension of nanowires and silver particles at a speed between 2000 and 6000 revolutions per minute.

### Claim 4 (depends on 3)

The process according to claim 3, wherein the suspension of silver nanowires is obtained in accordance with the following substeps:
dissolve polyvinyl pyrrolidone in ethylene glycol to obtain a solution,
heat the solution thus obtained to a temperature between 100° C. and 160° C., and
after temperature stabilization, add a solution of sodium chloride and iron(II) acetylacetonate, then add a solution of silver nitrate in ethylene glycol.

### Claim 5 (depends on 1)

The process according to claim 1, wherein the alcoholic solution of aminosilane comprises isopropanol.

### Claim 6 (depends on 1)

The process according to claim 1, wherein a concentration of the alcoholic solution of hydrolyzed epoxysilane and a concentration of the alcoholic solution of hydrolyzed aminosilane is about 0.1 mol/L.

### Claim 7 (depends on 1)

The process according to claim 1, wherein the stock formulation further comprises a dye at a weight concentration between 0.5% and 5% based on the dry weight of the stock formulation.

### Claim 8 (depends on 1)

The process according to claim 1, further comprising, prior to the deposition step of the coating, a step of stripping the part and/or a step of pretreating the part with an adhesion promoter.

### Claim 9 (depends on 1)

The process according to claim 1, further comprising, after the deposition step of the coating, a step of polymerization of the part at a temperature between 80° C. and 150° C.

### Claim 10 (depends on 1)

The process according to claim 1, wherein, in the stock formulation, the conductive nanowires have an aspect ratio between 1 and 100.

### Claim 11 (depends on 1)

The process according to claim 1, wherein the deposition step is carried out by spraying the dilute formulation onto the part, by dipcoating the part in the dilute formulation or by robotic means.

### Claim 12 (depends on 1)

A metal alloy part, characterized in that it comprises a coating obtained according to a treatment process according to claim 1, having a coating thickness between 0.5 and 5 microns.

### Claim 13 (depends on 12)

The part according to claim 12, wherein a constituent material of the part comprises an aluminum alloy, an iron alloy or a magnesium alloy.

### Claim 14 (depends on 12)

The part according to claim 12, wherein the coating comprises silver nanowires.

### Claim 15 (depends on 9)

The process according to claim 9, wherein the step of polymerization of the part is performed at a temperature between 80° C. and 120° C.