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.
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Inventors:
KIKKAWA TAKASHI (JP)
NAGAI NAOHIRO (JP)
NAGAI NAOHIRO (JP)
Application Number:
PCT/JP2018/038065
Publication Date:
April 25, 2019
Filing Date:
October 12, 2018
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
C23F11/14; F28F19/00
Foreign References:
| JPS4831759A | 1973-04-26 | |||
| CN105734582A | 2016-07-06 | |||
| JPS4910577B1 | 1974-03-12 | |||
| JPS5075653A | 1975-06-20 | |||
| JPH0994598A | 1997-04-08 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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