# US 2014/0154441 A1 · Reactive Silicon Oxide Precursor Facilitated Anti-Corrosion Treatment

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- Number: US 2014/0154441 A1
- Document ID: US20140154441A1
- Status: Published application
- Kind: A1
- Application number: 14/234,952
- Filed: 2012-07-30
- Published: 2014-06-05
- Earliest claimed: 2011-07-29
- Assignees: SiOx ApS
- Inventors: Henrik Pranov
- Web page: https://patentgrep.com/patent/US20140154441A1

## CPC

- C09D 5/084: {Inorganic compounds}
- C04B 41/009: {characterised by the material treated}
- C04B 41/5035: {Silica}
- C04B 41/87: Ceramics
- C23C 8/36: using ionised gases, e.g. ionitriding
- C23C 18/1212: {Zeolites, glasses}
- C23C 18/1241: {Metallic substrates}
- C23C 18/1245: {Inorganic substrates other than metallic}
- C23C 18/1295: {with after-treatment of the deposited inorganic material}
- Y10T 428/1317: Multilayer [continuous layer]
- Y10T 428/265: 1 mil or less
- 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)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention solves numerous problems in state-of-the-art industrial anti-corrosion protection by using a reactive silicon oxide precursor solution. Among the problems solved are those of decreased heat transfer over a protected surface, limited protection against high-temperature corrosive fluids and difficulties in protecting complex 3D geometries and surfaces with a high surface roughness. The present invention furthermore provides an easy way of making chemical surface functionalization using e.g. silane chemistry. The invention solves these problems by coating the surface of a ceramic or metallic part with a thin layer of a liquid solution of a reactive silicon oxide precursor (rSiO-p) such as Hydrogen Silsesquioxane (HSQ) in Methyl Isobytul Ketone (MIBK) or volatile methyl siloxane (VMS), heating the part to a curing temperature of the rSiO-p, and after a curing time the reactive silicon oxide precursor is transformed into a thin layer of essentially pin-hole free silicon oxide.

## Claims

### Claim at position 1

-10. (canceled)

### Claim 11

A method for anti-corrosion treatment of a part, said method comprising at least the following steps:
applying a liquid solution of a reactive silicon oxide precursor using a coating process onto at least one part of a treatment surface of a part consisting of a metallic or ceramic material.
allowing at least part of the solvent of the liquid reactive silicon oxide precursor solution to evaporate, thereby forming a non-liquid thin layer with a thickness of less than 10 μm of reactive silicon oxide precursor
heating the part to a heating temperature above a reaction temperature of the reactive silicon oxide precursor, thereby transforming the reactive silicon oxide precursor layer into a solid layer of silicon oxide while simultaneously forming covalent bonds between the layer of silicon oxide and the part, transforming the non-treated part into a treated part.

### Claim 12 (depends on 11)

A method according to claim 11, wherein the part is surface activated by a plasma containing oxygen prior to the coating with reactive silicon oxide precursor solution.

### Claim 13 (depends on 11)

A method according to claim 11, wherein the reactive silicon oxide precursor solution consists of a silsesquioxane in a solvent of either methyl isobutyl ketone (MIBK) or volatile methyl siloxanes (VMS).

### Claim 14 (depends on 13)

A method according to claim 13, in which the silsesquioxane is hydrogen silsesquioxane.

### Claim 15 (depends on 11)

A method according to claim 11, wherein the heating temperature is at least 300° C.

### Claim 16 (depends on 15)

A method according to claim 15, wherein the heating temperature is at least 400° C.

### Claim 17 (depends on 15)

A method according to claim 15, wherein the covalent bonds are stable in thermal cycling between 0° C. and the heating temperature for at least 10 cycles.

### Claim 18 (depends on 11)

A method according to claim 11, wherein the heat transfer coefficient of the part to a fluid in contact with the part is decreased by less than 1% as a result of treatment of the part.

### Claim 19 (depends on 11)

A method according to claim 11, wherein adhesion strength between the part and the solid layer of silicon oxide is at least 25 MPa.

### Claim 20 (depends on 11)

A method according to claim 11, in which the thickness of the non-liquid thin layer is less than 2 μm.

### Claim 21 (depends on 11)

A method according to claim 11, wherein the treatment surface of the part is non-smooth with a surface roughness Rz of more than 20 nm prior to said applying and a surface roughness of the treated part is at least 25% lower than the surface roughness of the treatment surface prior to said applying.

### Claim 22 (depends on 21)

A method according to claim 21, wherein the surface roughness Rz is from 20 to 300 nm.

### Claim 23 (depends on 11)

A method according to claim 11, further comprising, after said heating, coating at least the treatment surface of the part comprising the solid layer of silicon oxide with a silane-coupled chemical substance after assembly.

### Claim 24 (depends on 11)

An anti-corrosion treated part made by the method of claim 11.

### Claim 25 (depends on 24)

An anti-corrosion treated part according to claim 24, wherein the part is the whole or part of a part selected from: a mold used for polymer shaping processes, a heat exchanger, a pump, an automobile, airplane or another vehicle, a home appliance, a tool, a cell culture container, or a device used for diagnostic or chemical processing purposes.