Corrosion prevention methods for water systems

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The combination of a phosphorus compound, film-forming amine, and polymer enhances corrosion prevention in aqueous systems, addressing the weakness of film-forming amines and reducing corrosion during scale removal.

JP2025535989AActive Publication Date: 2025-10-30KURITA WATER INDUSTRIES LTD

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Patent Information

Application Number: JP2025525343
Authority / Receiving Office: JP · JP
Patent Type: Applications
Current Assignee / Owner
Priority Date: 2022-12-02
Filing Date: 2023-11-09
Publication Date: 2025-10-30
Estimated Expiration: 2043-11-09

Application Information

Patent Timeline

02 Dec 2022

Priority

09 Nov 2023

Application

JP2025525343

30 Oct 2025

Publication

JP2025535989A

IPC: C23F11/167; C23F11/14

CPC: C09D5/08; C09D5/084; C09D5/086; C09D133/14; C09D133/26; C09D7/63; C08F220/06; C08F2800/10

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Application Domain

Anti-corrosive paints

Technology Topics

Meth-Methacrylic monomers

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AI Technical Summary

Technical Problem

Conventional film-forming amines exhibit weak corrosion inhibitory effects and can increase material corrosion when used as scale removers in open circulating cooling water systems.

Method used

A combination of a phosphorus compound, a film-forming amine, and a polymer, specifically a (meth)acrylic acid-based copolymer and/or low-molecular-weight polymer, is used to enhance corrosion prevention in aqueous systems.

Benefits of technology

The combined use significantly improves corrosion inhibition, reducing material corrosion during scale removal and extending the life of metal materials in aqueous systems.

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Abstract

The present invention provides a technology relating to corrosion prevention of water systems for better suppressing corrosion of metals in contact with water. A corrosion prevention method for a water system for inhibiting corrosion of a metal in contact with the water system, comprising: A corrosion prevention method for an aqueous system, which uses a phosphorus compound, a film-forming amine, and a copolymer of a (meth)acrylic acid monomer and a sulfonic acid group-containing monomer, the copolymer having a weight-average molecular weight of 500 to 100,000, in the aqueous system. A metal corrosion inhibitor containing a phosphorus compound, a film-forming amine, and a low-molecular-weight polymer having a weight-average molecular weight of 500 to 100,000, and a corrosion prevention method for an aqueous system, which uses the metal corrosion inhibitor to inhibit corrosion of metals in contact with water.

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