Invention Grant
- Patent Title: Chemical conversion treatment liquid
- Patent Title (中): 化学转化处理液
-
Application No.: US13039656Application Date: 2011-03-03
-
Publication No.: US08333847B2Publication Date: 2012-12-18
- Inventor: Masaru Izawa , Kunio Goto
- Applicant: Masaru Izawa , Kunio Goto
- Applicant Address: JP Osaka
- Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee Address: JP Osaka
- Agency: Clark & Brody
- Priority: JP2001-50740 20010226; JP2001-368776 20011203
- Main IPC: C23C22/18
- IPC: C23C22/18 ; C23C22/12
Abstract:
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.
Public/Granted literature
- US20110146847A1 CHEMICAL CONVERSION TREATMENT LIQUID Public/Granted day:2011-06-23
Information query
IPC分类:
