Ductile iron pipe with composite coating

By employing a composite coating structure of alkali-activated gel layer and zinc-based coating on the surface of ductile iron pipe, the corrosion problem of the coating in acidic soil and overhead environment is solved, achieving stronger corrosion resistance and weather resistance, making it suitable for ductile iron pipes in complex environments.

CN117128394BActive Publication Date: 2026-03-20XINXING DUCTILE IRON PIPES CO LTD
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Patent Information

Application Number
CN202311214064.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-20
Publication Date
2026-03-20
Estimated Expiration
2043-09-20

AI Technical Summary

Technical Problem

The coatings of existing ductile iron pipes are prone to corrosion in acidic soils and overhead environments. Traditional coatings lack sufficient weather resistance and corrosion resistance, and cannot meet the needs of long-term applications.

Method used

The composite coating structure employs an alkali-activated gel layer and a zinc-based coating. The alkali-activated gel layer contains fibers and a penetrating waterproofing agent, while the zinc-based coating and the alkali-activated gel layer are bonded together. An inner lining layer can be added as needed to form a multi-layered anti-corrosion protection.

Benefits of technology

It improves the strength, toughness, and corrosion resistance of the coating, enhances its weather resistance and corrosion resistance in harsh environments, and is suitable for conveying corrosive water.

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Abstract

The application discloses a nodular cast iron pipe with a composite coating and belongs to the technical field of metal corrosion prevention, comprising a nodular cast iron pipe base body, a composite outer coating coated on the outer surface of the nodular cast iron pipe base body and an inner coating closely attached to the inner surface of the nodular cast iron pipe base body, characterized in that the composite outer coating comprises an alkali-activated gel layer and a zinc-based coating, the zinc-based coating is arranged between the outer surface of the nodular cast iron pipe base body and the alkali-activated gel layer, the alkali-activated gel layer is an alkali-activated slag fly ash corrosion-resistant gel material, and the zinc-based coating is one or more of a pure zinc coating, a zinc-aluminum alloy coating or a zinc-rich coating layer. The alkali-activated gel layer provided by the application is coated on the inner or outer surface of the pipe and provides further corrosion protection for the nodular cast iron pipe, so that the pipe can be used in extremely harsh construction environments, and has extremely strong weather resistance in acidic soil and overhead fields.
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