# US 10,371,307 B2 · Tank or pipe having a coating system

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- Number: US 10,371,307 B2
- Document ID: US10371307B2
- Status: Granted
- Kind: B2
- Application number: 15/033,493
- Filed: 2014-10-30
- Published: 2016-09-01
- Granted: 2019-08-06
- Earliest claimed: 2013-10-31
- Assignees: PPG Coatings Europe B.V.
- Applicants: Ppg Coatings Europe B.V.
- Inventors: Arnold Nederlof; Kees Van Der Kolk; Arjen Vellinga; Nathan J. Silvernail; Brian C. Okerberg
- Web page: https://patentgrep.com/patent/US10371307B2

## CPC

- F16L 58/1009: {the coating being placed inside the pipe}
- C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes
- C09D 5/084: {Inorganic compounds}
- C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- 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)

## Abstract

A tank or a pipe having an internal steel surface, at least a portion of the internal steel surface comprising a coating system. The coating system being formed of an overcoat layer and an overcoat-enhancing layer, the overcoat-enhancing layer being interposed between the steel surface and the overcoat layer. In use, the overcoat-enhancing layer enhances the chemical resistance of the overcoat layer to aggressive cargo types.

## Claims

### Claim 1

A tank or a pipe having an internal steel surface, wherein at least a portion of the internal steel surface comprises a coating system, the coating system comprising:
a. an overcoat layer comprising epoxy, silicate, polyurethane, polyurea, and/or vinyl esters; and
b. an overcoat-enhancing layer having a thickness between 10 nm to 2 μm, the overcoat-enhancing layer comprising a composition based on a group IIIB or IVB metal compound from the periodic table of elements, silane compound, metal alkoxide, zinc phosphate or mixtures thereof;
wherein at least a portion of the internal steel surface has a surface roughness prior to the application of the coating system of 20 μm to 150 μm;
the overcoat-enhancing layer being interposed between the internal steel surface and the overcoat layer, wherein the internal steel surface comprising the coating system is flat compared to an internal steel surface having the overcoat layer but not the overcoat-enhancing layer following exposure of the internal steel surface comprising the coating system and the internal steel surface having the overcoat layer but not the overcoat-enhancing layer to methyl ethyl ketone (40° C., 2 weeks).

### Claim 2 (depends on 1)

The tank or pipe according to claim 1, wherein the tank or pipe is configured to hold a liquid, solid or semi-solid.

### Claim 3 (depends on 1)

The tank or pipe according to claim 1, wherein the overcoat layer is formed from a single coat of an overcoat composition.

### Claim 4 (depends on 1)

The tank or pipe according to claim 1, wherein the overcoat layer is formed from a substantially volatile organic solvent free overcoat composition.

### Claim 5 (depends on 1)

The tank or pipe according to claim 1, wherein the steel surface has a level of cleanliness prior to coating of Sa3, Sa2½, Sa2 or Sa1.

### Claim 6

A tank or pipe coating system for application to at least a portion of an internal steel surface of a tank or pipe, the coating system comprising:
a. an overcoat layer comprising epoxy, silicate, polyurethane, polyurea, and/or vinyl esters; and
b. an overcoat-enhancing layer having a thickness between 10 nm to 2 μm, the overcoat-enhancing layer comprising a composition based on a group IIIB or IVB metal compound from the periodic table of elements, silane compound, metal alkoxide, zinc phosphate or mixtures thereof;
wherein at least a portion of the internal steel surface has a surface roughness prior to the application of the coating system of 20 μm to 150 μm;
the overcoat-enhancing layer being interposed between the internal steel surface and the overcoat layer, wherein the internal steel surface comprising the coating system is flat compared to an internal steel surface having the overcoat layer but not the overcoat-enhancing layer following exposure of the internal steel surface comprising the coating system and the internal steel surface having the overcoat layer but not the overcoat-enhancing layer to methyl ethyl ketone (40° C., 2 weeks).

### Claim 7

A method of increasing the chemical resistance of an overcoated steel surface, the method comprising interposing an overcoat-enhancing layer comprising a composition based on a group IIIB or IVB metal compound from the periodic table of elements, silane compound, metal alkoxide, zinc phosphate or mixtures thereof and having a thickness between 10 nm to 2 μm between a steel surface and an overcoat coating layer comprising epoxy, silicate, polyurethane, polyurea, and/or vinyl esters, wherein at least a portion of the steel surface has a surface roughness prior to the interposing of the overcoat-enhancing layer of 20 μm to 150 μm.