Surface conditioning prior to chemical conversion treatment...

Details Surface conditioning prior to chemical conversion treatment... Surface conditioning prior to chemical conversion treatment...

2006-06-02

2010-02-23

King, Roy (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S243000, C148S253000, C148S262000, C106S014050, C106S014120, C428S432000

Reexamination Certificate

active

07666266

ABSTRACT:
By subjecting a threaded joint for OCTG (oil country tubular goods) to surface conditioning with an aqueous solution of potassium tetraborate or sodium tetraborate prior to manganese phosphate chemical conversion treatment, a manganese phosphate chemical conversion coating having coarse crystal grains with an average crystal grain diameter of 10-110 micrometers is formed on the surface of the steel member which may be any steel including a high Cr steel. This manganese phosphate chemical conversion coating can hold a large amount of a liquid lubricant, and it is effective at preventing the occurrence of galling at the time of makeup of a threaded joint for OCTG.

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