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Title:
CORROSION PREVENTION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/078104
Kind Code:
A1
Abstract:
A corrosion prevention method for causing a film-forming amine and an M alkalinity component to coexist in a cooling water system, forming an anticorrosive coating on the surface of a metal member in contact with the cooling water system, and suppressing corrosion. In the present invention, a neutral amine is used as the M alkalinity component, and the M alkalinity of the cooling water system at the time of initial treatment is adjusted to 90 mg/L as CaCo3 or greater. Alternatively, an inorganic alkali is used as the M alkalinity component, and the M alkalinity of the cooling water system at the time of initial treatment is adjusted to 120 mg/L as CaCo3 or greater, and the pH is adjusted to 9.5 or greater.

Inventors:
KIKKAWA, Takashi (10-1 Nakano 4-chome, Nakano-k, Tokyo 01, 〒1640001, JP)
NAGAI, Naohiro (10-1 Nakano 4-chome, Nakano-k, Tokyo 01, 〒1640001, JP)
Application Number:
JP2018/038065
Publication Date:
April 25, 2019
Filing Date:
October 12, 2018
Export Citation:
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Assignee:
KURITA WATER INDUSTRIES LTD. (10-1, Nakano 4-chome Nakano-k, Tokyo 01, 〒1640001, JP)
International Classes:
C23F11/14; F28F19/00
Foreign References:
JPS4831759A1973-04-26
CN105734582A2016-07-06
JPS4910577B11974-03-12
JPS5075653A1975-06-20
JPH0994598A1997-04-08
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (Nissin bldg, 9F 5-10, Shinjuku 2-chome, Shinjuku-k, Tokyo 22, 〒1600022, JP)
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