# US 10,371,308 B2 · Threaded tubular element provided with a metallic anti-galling coating and a lubricant layer

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- Number: US 10,371,308 B2
- Document ID: US10371308B2
- Status: Granted
- Kind: B2
- Application number: 15/565,299
- Filed: 2016-04-21
- Published: 2018-11-01
- Granted: 2019-08-06
- Earliest claimed: 2015-04-23
- Assignees: Vallourec Oil and Gas France; Nippon Steel Corporation
- Applicants: Vallourec Oil and Gas France; Nippon Steel Corporation
- Inventors: Arnaud Verleene; Nicolas Baudin; Cedric Vogt; Adil Jaafar
- Web page: https://patentgrep.com/patent/US10371308B2

## CPC

- F16L 58/182: {for screw-threaded joints}
- C10M 107/04: Polyethylene
- C10M 107/28: containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
- C10M 107/30: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M 107/44: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M 125/02: Carbon; Graphite
- C10M 125/22: Compounds containing sulfur, selenium or tellurium
- C10M 129/40: monocarboxylic
- C10M 145/14: Acrylate; Methacrylate
- C10M 159/06: Waxes, e.g. ozocerite, ceresine, petrolatum, slack-wax
- C10M 171/00: Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated (chemically defined ingredients C10M101/00 - C10M169/00; petroleum fractions C10M101/02, C10M121/02, C10M159/04)
- C10M 2201/041: Carbon; Graphite; Carbon black
- C10M 2201/042: halogenated, i.e. graphite fluoride
- C10M 2201/053: used as base material
- C10M 2201/062: Oxides; Hydroxides; Carbonates or bicarbonates
- C10M 2201/066: Molybdenum sulfide
- C10M 2201/105: Silica
- C10M 2205/022: Ethene
- C10M 2205/0225: used as base material
- C10M 2205/18: Natural waxes, e.g. ceresin, ozocerite, bees wax, carnauba; Degras
- C10M 2207/126: monocarboxylic
- C10M 2209/084: Acrylate; Methacrylate
- C10M 2209/0845: used as base material
- C10M 2209/1003: used as base material
- C10M 2209/103: Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M 2213/062: Polytetrafluoroethylene [PTFE]
- C10M 2217/0443: used as base material
- C10M 2217/0453: used as base material
- C10M 2219/044: Sulfonic acids, Derivatives thereof, e.g. neutral salts
- C10M 2219/068: Thiocarbamate metal salts
- C10N 2010/02: Groups 1 or 11
- C10N 2010/04: Groups 2 or 12
- C10N 2010/12: Groups 6 or 16
- C10N 2010/14: Group 7
- C10N 2040/34: Lubricating-sealants
- C10N 2050/015: {Dispersions of solid lubricants}
- C10N 2050/023: {Multi-layer lubricant coatings}
- C10N 2050/08: Solids
- C10N 2070/00: Specific manufacturing methods for lubricant compositions
- C10N 2080/00: Special pretreatment of the material to be lubricated, e.g. phosphatising or chromatising of a metal
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

The invention concerns a threaded portion of a tubular element for a threaded tubular connection having an axis of revolution, the portion comprising a threading extending over its outer or inner peripheral surface, and a first sealing surface on the peripheral surface, the first sealing surface being capable of producing metal-metal interference with a corresponding second sealing surface belonging to a complementary threaded portion. The threading and the first sealing surface are coated with a metallic anti-galling layer wherein zinc (Zn) is the major element by weight, the metallic anti-galling layer being at least partially coated with a lubricant layer comprising a resin and a dry solid lubricant powder dispersed in the resin.

## Claims

### Claim 1

A threaded portion of a tubular element for a threaded tubular connection having an axis of revolution, said portion comprising a threading extending over its outer or inner peripheral surface, and a first sealing surface on said peripheral surface, said first sealing surface being capable of producing metal-metal interference with a corresponding second sealing surface belonging to a complementary threaded portion, wherein said threading and said first sealing surface are coated with an electrolytically deposited metallic anti-corrosion and anti-galling layer wherein zinc (Zn) is the major element by weight, said electrolytically deposited metallic anti-corrosion and anti-galling layer being at least partially coated with a lubricant layer comprising a resin and a dry solid lubricant powder dispersed in said resin.

### Claim 2 (depends on 1)

The threaded portion according to claim 1, wherein the electrolytically deposited metallic anti-corrosion and anti-galling layer comprises at least 50% by weight of zinc (Zn).

### Claim 3 (depends on 1)

The threaded portion according to claim 1, wherein the electrolytically deposited metallic anti-corrosion and anti-galling layer has a thickness in the range 4 μm to 20 μm.

### Claim 4 (depends on 1)

The threaded portion according to claim 1, wherein the lubricant layer has a thickness in the range 5 μm to 50 μm.

### Claim 5 (depends on 1)

The threaded portion according to claim 1, wherein the electrolytically deposited metallic anti-corrosion and anti-galling layer comprises a substance selected from the group consisting of pure zinc (Zn) and a binary alloy of zinc (Zn) of the type Zn—X, in which X is selected from nickel (Ni), iron (Fe), magnesium (Mg) and manganese (Mn).

### Claim 6 (depends on 1)

The threaded portion according to claim 1, wherein the electrolytically deposited metallic anti-corrosion and anti-galling layer is a binary zinc-nickel (Zn—Ni) alloy wherein the nickel (Ni) content is in a range of from 12% to 15% by weight and wherein the microstructure is monophase and in the gamma (γ) phase.

### Claim 7 (depends on 1)

The threaded portion according to claim 1, further comprising a passivation layer comprising trivalent chromium (Cr(III)), said passivation layer being between the metallic anti-galling layer and the lubricant layer.

### Claim 8 (depends on 1)

The threaded portion according to claim 1, wherein said dry solid lubricant powder is selected from the group consisting of polytetrafluoroethylenes (PTFE), molybdenum dithiocarbamates (MoDTC), molybdenum disulphides (MoS2), carbon blacks (C), graphite fluorides (CFx) and any mixture thereof.

### Claim 9 (depends on 1)

The threaded portion according to claim 1, wherein said resin is selected from the group consisting of polyvinyl resins, epoxy resins, acrylic resins, polyurethane resins and polyamide-imide resins.

### Claim 10 (depends on 1)

The threaded portion according to claim 1, wherein the resin is an acrylic resin and the dry solid lubricant powder comprises 3% to 15% of carbon blacks, molybdenum disulphides (MoS2) or molybdenum dithiocarbamates (MoDTC), used alone or as a combination.

### Claim 11 (depends on 1)

The threaded portion according to claim 1, wherein said portion further comprises a first abutment which is capable of coming into contact with a corresponding second abutment, at the end of makeup, belonging to a complementary threaded tube portion.

### Claim 12 (depends on 1)

The threaded portion according to claim 1, wherein said portion comprises steel.

### Claim 13 (depends on 1)

The threaded portion according to claim 1, wherein said portion is male in type, with a threading extending over its outer peripheral surface as well as a first sealing surface on said outer peripheral surface.

### Claim 14 (depends on 1)

The threaded portion according to claim 1, wherein said portion is female in type, with a threading extending over its inner peripheral surface as well as a first sealing surface on said inner peripheral surface.