C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/78 (2006.01) C23C 22/18 (2006.01)
Patent
CA 2546271
The surface adjustment treatment of a screw joint for an oil well pipe by the use of an aqueous solution of potassium tetraborate or sodium tetraborate and then the manganese phosphate based chemical treatment of the resultant screw joint results in the formation of a manganese phosphate based chemical coating film comprising coarse crystal grains having an average grain diameter of 10 to 110 µm on the surface of various steel products including a high Cr steel. The above manganese phosphate based chemical coating film can hold a large amount of a liquid lubricating agent, and consequently, is effective for the prevention of the occurrence of galling upon the joining of the screw joint for an oil well pipe.
Selon cette invention, un traitement à ajustement superficiel d'un joint à vis d'un tuyau de puits de pétrole s'effectue au moyen d'une solution aqueuse de tétraborate de potassium ou de tétraborate de sodium et, puis, le traitement chimique à base de phosphate de manganèse du joint à vis résultant débouche sur la formation d'un film de revêtement chimique à base de phosphate de manganèse contenant des grains de cristal grossiers qui possèdent un diamètre de grain moyen compris entre 10 et 110 mu m à la surface de divers produits en acier contenant une quantité élevée d'acier au chrome. Ledit film de revêtement chimique à base de phosphate de manganèse peut contenir une quantité importante d'un agent lubrifiant liquide et, par conséquent, est efficace dans la prévention de l'apparition de grippage sur l'assemblage du joint à vis pour tuyau de puits de pétrole.
Goto Kunio
Izawa Masaru
Takano Takahiro
Ujita Yoshihisa
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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