Title:
淡水環境における鉄系材料の腐食抑制方法
Document Type and Number:
Japanese Patent JP6390896
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a corrosion inhibition method for a ferrous material such as carbon steel constituting a reactor pressure vessel, a reactor containment vessel and various support structures and a cooling water piping and the like of a nuclear power plant which is damaged by a severe accident, an earthquake disaster and the like, the method enabling the risk of corrosion of the whole surface of the ferrous material and through leakage caused by local corrosion of the ferrous material to be prevented, and enabling corrosion to be effectively inhibited over a long period of time, even when fresh water which contains more corrosive ions such as chloride ions and sulfate ions than normal pure water and is in a situation of being exposed to radiation rays is used as cooling water.SOLUTION: A method for inhibiting corrosion of a ferrous material in a fresh water environment is provided in which when a sum of the equivalent weight of chloride ions and sulfate ions contained in the fresh water is 6.2 meq/L or less, pentaboric acid ions are caused to coexist with fresh water in such a way that a sum of the equivalent weight of hydrogen carbonate ions and the pentaboric acid ions becomes 74 meq/L or more.SELECTED DRAWING: Figure 2
Inventors:
Yuichi Fukaya
Toshifumi Hirasaki
Katsuhiko Kumagai
Teruhisa Tatsuoka
Toshifumi Hirasaki
Katsuhiko Kumagai
Teruhisa Tatsuoka
Application Number:
JP2014157369A
Publication Date:
September 19, 2018
Filing Date:
August 01, 2014
Export Citation:
Assignee:
TEPCO Holdings Co., Ltd.
International Classes:
C23F11/18; G21D1/00
Domestic Patent References:
| JP6158364A | ||||
| JP2003129263A | ||||
| JP2013092392A |
Other References:
小澤正義 他,淡水環境における炭素鋼の不働態化/局部腐食挙動におよぼす五ホウ酸ナトリウムの影響,材料と環境2014講演集,日本,2014年 4月30日,397-400
R.F. Steigerwald,腐食の電気化学,防蝕技術,日本,1968年,Vol.17 No.10/11,471-478
R.F. Steigerwald,腐食の電気化学,防蝕技術,日本,1968年,Vol.17 No.10/11,471-478
Attorney, Agent or Firm:
Mitsuko Nakayama