PLATING SOLUTION FOR PIPE THREADED COUPLING AND MANUFACTURING METHOD FOR PIPE THREADED COUPLING

Title:

PLATING SOLUTION FOR PIPE THREADED COUPLING AND MANUFACTURING METHOD FOR PIPE THREADED COUPLING

Document Type and Number:

WIPO Patent Application WO/2015/174095

Kind Code:

A1

Abstract:

Provided is a plating solution for a pipe threaded coupling in order to form a plating film having superior seizure resistance, crevice corrosion resistance, and resistance to corrosion from exposure. A plating solution for a pipe threaded coupling according to an embodiment does not contain a cyanide, and does contain copper pyrophosphate, tin pyrophosphate, zinc pyrophosphate, a pyrophosphate serving as a metal complexing agent, and 40 g/L or less (not including 0) of a sulfur-containing compound. The sulfur-containing compound is one or more of a mercapto compound and sulfide compound as defined by formula (1), a dimer obtained by disulfide bonding of a mercapto compound, and salts thereof.　RS-(CHX1)m-(CHX2)n-CHX3X4 (1), where m and n are integers of 1 or 0. X1, X2, X3 and X4 are any one of hydrogen, OH, NH2, SO3H, and CO2H. However, X1, X2, X3 and X4 are not all hydrogen. R is any one of hydrogen, a methyl group, and an ethyl group.

Inventors:

KIMOTO MASANARI (JP)
ISHII KAZUYA (JP)
GOTO KUNIO (JP)
YAMAMOTO TATSUYA (JP)
OSHIMA MASAHIRO (JP)
NAKAO SEIICHIRO (JP)
YAMAGUCHI DAISUKE (JP)

Application Number:

PCT/JP2015/002456

Publication Date:

November 19, 2015

Filing Date:

May 15, 2015

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
DAIWA FINE CHEMICALS CO LTD LAB (JP)

International Classes:

C25D3/58; C25D5/26; C25D7/00; F16L15/04

Foreign References:

JP2011527381A	2011-10-27
JP2010270374A	2010-12-02
JP2008215473A	2008-09-18
JP2011042841A	2011-03-03
JP2011520037A	2011-07-14
JP2013534963A	2013-09-09

Other References: