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

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.

1 . A threaded end of a tubular component, 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, and wherein the tubular component is suitable for drilling and/or operating a hydrocarbon well, transporting oil and gas, transporting or storing hydrogen, carbon capture or geothermal energy. 
     
     
         2 . The threaded end of a tubular component according to  claim 1 , wherein the content of zinc (Zn) is greater than 50% by weight, relative to the total weight of the zinc-chromium alloy. 
     
     
         3 . The threaded end of a tubular component according to  claim 1 , wherein the content of chromium (Cr) is greater than or equal to 3% by weight, relative to the total weight of the zinc-chromium alloy. 
     
     
         4 . The threaded end of a tubular component according to  claim 1 , wherein the content of chromium (Cr) varies from 20% to 30% by weight, relative to the total weight of the zinc-chromium alloy. 
     
     
         5 . The threaded end of a tubular component according to  claim 1 , wherein the layer comprising a zinc-chromium (Zn—Cr) alloy is electrodeposited. 
     
     
         6 . The threaded end of a tubular component according to  claim 1 , wherein the layer comprising a zinc-chromium (Zn—Cr) alloy has a thickness ranging from 4 to 20 μm. 
     
     
         7 . The threaded end of a tubular component according to  claim 1 , wherein the tubular component further comprises at least one non-threaded portion coated with the layer comprising a zinc-chromium (Zn—Cr) alloy. 
     
     
         8 . The threaded end of a tubular component according to  claim 7 , wherein the non-threaded portion comprises a stop and/or a sealing seat. 
     
     
         9 . The threaded end of a tubular component according to  claim 1 , wherein the threaded end is made of steel. 
     
     
         10 . A process for preparing a threaded end of a tubular component as defined in  claim 1 , comprising at least one electrodeposition of an aqueous composition comprising one or more zinc salts, one or more chromium salts, one or more electrolytes and one or more surfactants on a surface of the thread of said end. 
     
     
         11 . The process according to  claim 10 , further comprising a preparation of the surface to be coated. 
     
     
         12 . A tubular component for drilling and/or operating a hydrocarbon well, transporting oil and gas, transporting or storing hydrogen, carbon capture or geothermal energy, comprising a threaded end according to  claim 1 . 
     
     
         13 . The tubular component according to  claim 12 , wherein the tubular component is of the male type and has at least one thread ( 3 ) extending over an outer peripheral surface. 
     
     
         14 . The tubular component according to  claim 12 , wherein the tubular component is of the female type and has at least one thread ( 4 ) extending over an inner peripheral surface. 
     
     
         15 . A tubular threaded joint comprising a threaded end of a male-type tubular component having a thread extending over its outer peripheral surface and a threaded end of a female-type tubular component having at least one thread extending over its inner peripheral surface, which are screwed into one another, wherein at least one of the threaded ends is according to  claim 1 . 
     
     
         16 . The process according to  claim 11 , wherein the preparation of the surface to be coated comprises a mechanical treatment or a sandblasting process.