# US 10,308,817 B2 · Anticorrosion layer and process for production thereof

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- Number: US 10,308,817 B2
- Document ID: US10308817B2
- Status: Granted
- Kind: B2
- Application number: 15/113,439
- Filed: 2014-11-07
- Published: 2017-01-12
- Granted: 2019-06-04
- Earliest claimed: 2013-11-08
- Assignees: Epg (Engineered Nanoproducts Germany) AG
- Applicants: Technische Universität Bergakademie Freiberg
- Inventors: Edwin Kroke; Stefan Pfeifer
- Web page: https://patentgrep.com/patent/US10308817B2

## CPC

- C09D 5/08: Anti-corrosive paints
- B05D 1/02: performed by spraying
- B05D 1/18: performed by dipping
- B05D 1/28: performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
- C09D 183/04: Polysiloxanes
- C09D 183/06: containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence)
- C23C 18/122: {Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes}
- C23C 18/1225: {Deposition of multilayers of inorganic material}
- C23C 18/1254: {Sol or sol-gel processing}
- C23C 18/1295: {with after-treatment of the deposited inorganic material}
- C08G 77/04: Polysiloxanes
- C08G 77/18: to alkoxy or aryloxy groups
- C23C 18/1241: {Metallic substrates}
- 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)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

The invention relates to a protection layer which is used as anticorrosion layer on corrosion-prone substrates, especially corroding metals, alloys and other materials, especially on steel, and as a basecoat for the application of further porous layer systems or as a topcoat, and to the process for production thereof and to use on a coated substrate for protection against corrosion and specifically for use against microbially induced corrosion (MIC), wherein the anticorrosion layer comprises a high-density protection layer on a corrosion-prone substrate, containing pre-condensed layer-forming alkoxysilane precursors, wherein the molecules of the pre-condensed layer-forming alkoxysilane precursors are formed from monomer units selected from the group of the triethoxysilane precursors, wherein the molecules of the pre-condensed layer-forming alkoxysilane precursors are crosslinked with one another, and wherein the high-density protection layer has a layer thickness of at least 50 μm.

## Claims

### Claim 1

An anti-corrosion coating to protect against corrosion, comprising
a high-density protective coating with a low defect density and having no fractures, agglomerates or pores with dimensions in the millimetric or micrometric range on a substrate which is prone to corrosion, said high-density protective coating containing pre-condensed coat-forming alkoxysilane precursors,
wherein the molecules of the pre-condensed coat-forming alkoxysilane precursors are linear and short-chained alkoxysilanes, consisting of least 2 to 1000 monomers, and built up from monomer units of the alkoxysilane precursor employed,
wherein the molecules of the pre-condensed coat-forming alkoxysilane precursors are cross-linked with each other,
wherein the high-density protective coating has a coating thickness of at least 50 μm,
wherein the anti-corrosion coating further comprises a porous coating system with open pores having a pore diameter ranging from 1 to 200 microns,
wherein the porous coating system is applied to the high-density protective coating, and
wherein the porous coating system is formed from cross-linked alkoxysilane precursors, and organisms acting against microbially influenced corrosion colonize the pores.

### Claim 2 (depends on 1)

The anti-corrosion coating as claimed in claim 1, wherein the alkoxysilane precursor is methyltriethoxysilane and/or tetraethoxyorthosilicate and/or tetramethoxyorthosilicate and/or methyltrimethoxysilane and/or dimethyldiethoxysilane and/or phenyltriethoxysilane.

### Claim 3 (depends on 1)

The anti-corrosion coating as claimed in claim 1, wherein the high-density protective coating contains up to 20% by weight of adhesion promoter.

### Claim 4 (depends on 3)

The anti-corrosion coating as claimed in claim 3, wherein the adhesion promoter is 3-glycidyloxypropyltriethoxysilane and/or 3-glycidyloxypropyltrimethoxysilane and/or 3-glycidoxypropylmethyldiethoxysilane and/or 3-glycidoxypropylmethyldimethoxysilane and/or 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and/or 2-(3,4-epoxycyclohexyl)-ethyltriethoxysilane and/or 3-aminopropyltriethoxysilane and/or 3-aminopropylmethyldiethoxysilane and/or aminopropyltrimethoxysilane and/or (3-trimethoxysilylpropyl)diethylentriamine and/or aminoethylaminopropyltrimethoxysilane and/or aminoethylaminopropyltriethoxysilane and/or aminoethylaminopropylmethyldimethoxysilane.

### Claim 5 (depends on 1)

The anti-corrosion coating as claimed in claim 1, wherein the high-density protective coating contains up to 22.5% by weight of particulate material.

### Claim 6 (depends on 1)

The anti-corrosion coating as claimed in claim 1, wherein a porous top coat formed from
cross-linked alkoxysilane precursors is applied to the porous coating system,
wherein the porous top coat comprises pores with a pore diameter of less than 5 μm.