US 11,795,671 B2
Faucet fitting
Saori Ukigai, Fukuoka (JP); Ryojiro Hijikata, Fukuoka (JP); and Ryo Koga, Fukuoka (JP)
Assigned to TOTO LTD., Fukuoka (JP)
Filed by TOTO LTD., Fukuoka (JP)
Filed on Mar. 25, 2021, as Appl. No. 17/212,660.
Application 17/212,660 is a continuation of application No. PCT/JP2019/038371, filed on Sep. 27, 2019.
Claims priority of application No. 2018-181763 (JP), filed on Sep. 27, 2018; and application No. 2019-066032 (JP), filed on Mar. 29, 2019.
Prior Publication US 2021/0207349 A1, Jul. 8, 2021
Int. Cl. E01C 1/00 (2006.01); C23C 22/03 (2006.01); C23C 28/00 (2006.01); E03C 1/10 (2006.01); E03C 1/04 (2006.01)
CPC E03C 1/10 (2013.01) [E03C 1/0404 (2013.01); C23C 22/03 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A faucet fitting comprising:
a metal base material; and
a plating layer partially formed on a surface of the metal base material, wherein
the metal base material contains at least one metal element selected from the group consisting of copper, zinc, and tin,
the plating layer contains at least one metal element selected from the group consisting of chromium and nickel,
a layer of organic compound is further provided on the plating layer via a passivation layer existing on the surface of the plating layer,
the layer of organic compound binds to the passivation layer by binding the metal element (M) constituting the passivation layer via an oxygen atom (O) to a phosphorus atom (P) of at least one group (X) selected from a phosphonic acid group, a phosphoric acid group, and a phosphinic acid group (M-O—P bond), and the group X is bonded to a group R, where R is a hydrocarbon group or a group having an atom other than carbon at one or two positions in the hydrocarbon group, and
a phosphorus atom concentration on a surface of a portion where the plating layer is not formed on the metal base material is lower than a phosphorus atom concentration on a surface of the layer of organic compound provided on the plating layer.