# US 9,435,036 B2 · Silicate coatings

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- Number: US 9,435,036 B2
- Document ID: US9435036B2
- Status: Granted
- Kind: B2
- Application number: 14/656,802
- Filed: 2015-03-13
- Published: 2016-03-10
- Granted: 2016-09-06
- Earliest claimed: 2014-09-08
- Assignees: MCT Holdings, LLC
- Applicants: MCT Holdings Limited
- Inventors: Hamlin Jennings; Michał Szczȩśniak
- Web page: https://patentgrep.com/patent/US9435036B2

## CPC

- C23C 28/04: only coatings of inorganic non-metallic material
- C09D 1/02: alkali metal silicates
- C09D 5/08: Anti-corrosive paints
- C23C 14/081: {of aluminium, magnesium or beryllium}
- C23C 14/10: Glass or silica
- C23C 14/5846: {Reactive treatment}
- C25D 9/06: by anodic processes
- C25D 11/024: {Anodisation under pulsed or modulated current or potential}
- C25D 11/08: containing inorganic acids
- C25D 11/10: containing organic acids
- C25D 11/18: After-treatment, e.g. pore-sealing
- 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)
- 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)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

Metal products having improved properties and processes for preparing the metal products are provided. The present disclosure provides for a metal product comprising a metal surface, an oxide layer and a glass layer. The glass layer is provided by coating a stable aqueous silicate or borosilicate solution onto the metal surface and curing the aqueous solution to produce a glass layer. The metal products have surface characteristics that outperform all anodized metal surfaces.

## Claims

### Claim 1

A layered product comprising:
a substrate selected from the group consisting of aluminum and an aluminum alloy,
an anodized-aluminum layer, having a composition that is free of silicates, carried by the substrate;
wherein the anodized-aluminum layer is a hot-sealed, anodized aluminum layer; and
a silicate glass layer directly carried by the anodized aluminum layer, having a silicate glass layer composition that consists of silicon, oxygen, sodium, lithium and boron.

### Claim 2 (depends on 1)

The layered product of claim 1, wherein the anodized-aluminum layer has an EDX composition that is free of boron, and/or nickel.

### Claim 3 (depends on 1)

The layered product of claim 1, wherein the silicate glass layer has a composition that consists of about 55 wt. % to about 98 wt. % SiO2, 0 wt. % to about 6.7 wt. % B2O3, and about 2.3 wt. % to about 36 wt. % M2O, wherein M is a mixture of lithium and sodium.

### Claim 4 (depends on 1)

The layered product of claim 1, wherein the silicate glass layer has a thickness in the range of about 50 nm to about 3000 nm.

### Claim 5 (depends on 1)

The layered product of claim 1, wherein the anodized-aluminum layer has a EDX composition that consists of aluminum, oxygen, sulfur, and an optional colorant.

### Claim 6 (depends on 1)

The layered product of claim 1, wherein the anodized-aluminum layer has a TOF-SIMS composition that consists of aluminum, oxygen, sulfur, and an optional colorant.

### Claim 7 (depends on 1)

The layered product of claim 1, wherein the layered product is free of an aluminosilicate or silicate/alumina interdiffusion.

### Claim 8 (depends on 1)

The layered product of claim 1, wherein the product passes a 2 minute “pH 14 Test” and a “24-hour CASS Test”.

### Claim 9

A layered product comprising:
a substrate selected from the group consisting of aluminum and an aluminum alloy,
an anodized-aluminum layer carried by the substrate, the anodized aluminum layer having a non-porous, hot sealed aluminum oxide surface distal from the substrate; and
a borosilicate glass layer directly carried by the non-porous, hot-sealed aluminum oxide surface, having a borosilicate glass layer composition that consists of silicon, oxygen, sodium, lithium and boron.

### Claim 10 (depends on 9)

The layered product of claim 9, wherein the layered product passes a 2 minute “pH 14 Test” and a “24-hour CASS Test”.

### Claim 11

An aluminum part having a corrosion resistant surface; the corrosion resistant surface comprising:
an aluminum or an aluminum alloy surface;
a hot-sealed, anodized-aluminum layer carried by the aluminum or aluminum alloy surface; and
a borosilicate glass layer carried directly by the hot-sealed, anodized-aluminum layer, having a borosilicate glass layer composition that consists of silicon, oxygen, sodium, lithium and boron; and
wherein the corrosion resistant surface of the aluminum part passes a 2 minute “PH 14 Test” and a “24-hour CASS Test”.