Title:
炭素鋼部材の防食方法
Document Type and Number:
Japanese Patent JP4898877
Kind Code:
B2
Abstract:
A bath containing nickel ions and formic acid is injected into a film-forming aqueous solution flowing in a circulation pipe connected to a feed water pipe made of carbon steel in a BWR plant. This solution is supplied into the pipe through the circulation pipe, and a nickel metal film is formed on an inner surface of the pipe. After the film is formed, a film-forming aqueous solution containing iron (II) ions, formic acid, nickel ions, hydrogen peroxide, and hydrazine is supplied to the pipe. A nickel ferrite film is formed on the surface of the nickel metal film in the pipe. The nickel ferrite film comes into contact with water containing dissolved oxygen at or above 150° C. to transform the nickel metal film into a nickel ferrite film. A thick nickel ferrite film is formed on the inner surface of the feed water pipe.
Inventors:
Go Ito
Hideyuki Hosokawa
Yukio Hirama
Motoaki Sakashita
Makoto Nagase
Hideyuki Hosokawa
Yukio Hirama
Motoaki Sakashita
Makoto Nagase
Application Number:
JP2009181310A
Publication Date:
March 21, 2012
Filing Date:
August 04, 2009
Export Citation:
Assignee:
Hitachi ge Nuclear Energy Co., Ltd.
International Classes:
C23C28/00; C23C8/40; C23C18/32; C23F15/00; G21C19/307; G21D1/00; G21D3/08
Domestic Patent References:
| JP2007182604A | ||||
| JP2006038483A | ||||
| JP2003268558A |
Attorney, Agent or Firm:
Polaire Patent Business Corporation