C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/07 (2006.01) B05D 7/14 (2006.01) C23C 22/00 (2006.01) C23C 22/08 (2006.01) C23C 22/12 (2006.01) C23C 22/18 (2006.01) C23C 22/50 (2006.01) C23C 22/62 (2006.01)
Patent
CA 2439135
A chemical conversion treatment liquid which can stably form a phosphate--type chemical conversion film on a steel material for a joint portion of an oil well steel pipe containing 0.5 - 13% Cr is developed. Using a chemical conversion treatment liquid to which a prescribed amount of potassium is added, a chemical conversion film containing a prescribed amount of potassium compounds and having a prescribed thickness can be formed on the threaded surface of a joint portion of an oil well steel pipe.
Cette invention concerne un film de conversion chimique, présentant une épaisseur spécifiée et contenant une certaine quantité d'un composé de potassium, est formé sur la surface d'une vis d'un joint d'un tuyau en acier de puits de pétrole au moyen d'une solution de traitement de conversion chimique à laquelle est ajoutée une certaine quantité d'ions de potassium. La solution de traitement de conversion chimique permet d'obtenir la formation stable d'un film de conversion chimique de phosphate sur un joint d'un produit en acier d'un tuyau de puits de pétrole contenant entre 0,5 et 13 % de Cr.
Goto Kunio
Izawa Masaru
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
LandOfFree
Surface treated steel product, method for production thereof... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface treated steel product, method for production thereof..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface treated steel product, method for production thereof... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1862624