Threaded end of a tubular component provided with a coating comprising a zinc-chromium alloy

A zinc-chromium alloy coating with a chromium content of 20% to 30% by weight is applied to tubular components to address the toxicity and environmental concerns of previous coatings, providing effective corrosion and galling protection while ensuring operator safety.

US20250043455A1Pending Publication Date: 2025-02-06VALLOUREC MANNESMANN OIL & GAS FRANCE +1
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Patent Information

Application Number
US18/697786
Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Priority Date
2021-10-07
Filing Date
2022-10-06
Publication Date
2025-02-06

AI Technical Summary

Technical Problem

Existing metallic coatings used to protect threaded ends of tubular components from corrosion and galling, such as zinc-nickel and zinc-cobalt coatings, are toxic due to the use of harmful nickel and cobalt salts, posing health risks to operators and not being environmentally friendly.

Method used

A zinc-chromium (Zn—Cr) alloy coating is applied to the threaded ends of tubular components, where zinc is the predominant element and chromium is present in a range of 20% to 30% by weight, providing effective corrosion and galling protection without the toxicity issues of previous coatings.

Benefits of technology

The zinc-chromium coating offers excellent corrosion resistance and galling protection, even in harsh environments, while being non-toxic and environmentally friendly, ensuring the safety of operators and reducing long-term health risks.

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Abstract

A threaded end of a tubular component is for drilling and / or operating a hydrocarbon well, transporting oil and gas, transporting or storing hydrogen, carbon capture or geothermal energy, comprising at least one thread extending over its outer or inner peripheral surface, wherein the thread is coated with a layer comprising a zinc-chromium (Zn—Cr) alloy in which zinc (Zn) is the predominant element by weight, relative to the total weight of the alloy. A process for preparing a threaded end, as defined above, includes at least one electrodeposition, on the surface of the thread of the end, of an aqueous composition comprising one or more zinc salts, one or more chromium salts, one or more electrolytes and one or more surfactants.
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Citation Information

Patent Citations

  • Threaded Connection for Pipe or Tube and Method for Producing the Threaded Connection for Pipe or Tube

    US20190010767A1

  • Threaded Connection for Pipes and Method for Producing Threaded Connection for Pipes

    US20200400255A1

  • Corrosion resistant steel sheets improved in corrosion resistance and other characteristics

    US5510196A