Three-dimensional ferrous phosphate pigment with corrosion early warning capability and preparation method thereof

By preparing ferrous phosphate pigments with three-dimensional structures, the problem that existing zinc phosphate pigments are difficult to stop metal corrosion when facing corrosive ions and water molecules is solved, and effective corrosion protection and corrosion warning of metals are achieved.

CN119218955BActive Publication Date: 2025-04-15LANXI MAGNESIUM MATERIALS RESEARCH INSTITUTE
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Patent Information

Application Number
CN202411729820.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-29
Publication Date
2025-04-15
Estimated Expiration
2044-11-29

AI Technical Summary

Technical Problem

When existing zinc phosphate pigments face the invasion of corrosive ions and water molecules, they are difficult to effectively block metal corrosion, and they cannot promptly warn of corrosion.

Method used

A three-dimensional structural ferrous phosphate pigment is used to prepare a three-dimensional structural ferrous ion-containing solution and an initial mixed solution, and react and refine it using ultrasonic oscillation and microwave heating auxiliary devices, and finally obtain a three-dimensional structural ferrous phosphate pigment with corrosion warning ability through high-temperature heating treatment.

Benefits of technology

This pigment has obvious corrosion warning ability in aqueous epoxy coatings. When external oxygen and water molecules penetrate to the interface, Fe2+ in the pigment is oxidized to Fe3+, producing yellow-brown rust, indicating a corrosion threat, and improving anti-corrosion performance through three-dimensional structure and hydrolysis reactions to block the penetration of corrosive ions.

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Abstract

The present scheme provides a preparation method of a three-dimensional structured ferrous phosphate pigment with corrosion warning capability, comprising the following steps: configuring a ferrous ion-containing solution for providing ferrous ions, wherein the ferrous ion-containing solution contains soluble ferrous salts and surfactants and does not contain oxidizing ions, and the ferrous ion-containing solution is in an acidic environment; configuring an initial mixed solution for providing phosphate ions and ammonium ions; atomizing and spraying the initial mixed solution into the ferrous ion-containing solution to obtain an intermediate mixed solution, and using an ultrasonic oscillation and microwave heating auxiliary device to ultrasonically refine, heat and keep the intermediate mixed solution warm to obtain a final mixed solution; filtering the precipitate in the final mixed solution, and transferring the precipitate to a vacuum environment for high-temperature heating treatment to obtain a three-dimensional structured ferrous phosphate pigment with corrosion warning capability, which can have corrosion warning capability.
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