How should rust prevention be applied to square pipes that have already rusted?

Following a period of operation, corrosion protection layers on certain sections of metal pipelines may deteriorate, peel away, or become damaged. This leads to severe corrosion of the pipe body, with localised perforations and leaks emerging. Regardless of the form of corrosion or mechanical damage, the ultimate outcome manifests as the degradation or loss of the pipeline's mechanical properties, most commonly evidenced by wall thinning. Subsequently, the pipeline may even suffer extensive cracking, perforation, or other severe failures that disrupt normal conveyance.

Rusted square pipes require descaling to remove loose rust scales and deposits before flash rust prevention treatment can be applied. Multiple rust removal methods exist: cleaning the square pipe to eliminate surface oil and dust; mechanical removal using tools like wire brushes to abrade loose rust and weld slag; or acid pickling to remove scale, rust, and old coatings – though this risks environmental contamination. Mechanical cleaning proves time-consuming and labour-intensive. While these methods can eliminate surface rust, they all present significant drawbacks. They may cause environmental pollution and fail to prevent flash rust formation.

How, then, should square pipes be protected against flash rust once rust has formed?

Opting for an flash rust inhibitor  suitable for rust-over-rust coating addresses both the rust issue and prevents flash rust. Our newly developed CK82 flash rust inhibitor meets these requirements. As a highly effective corrosion inhibitor, it requires low dosage and offers superior flash rust prevention. It can be applied directly onto rusted substrates and is compatible with various metal substrates including iron, cast iron, carbon steel, alloy steel, and other metallic substrates. It exhibits excellent compatibility with coating systems, without affecting drying speed or coating adhesion to the substrate.

As a specialist manufacturer of flash rust inhibitors, our products have undergone multiple national quality inspections and certifications. We maintain a comprehensive quality assurance system to effectively safeguard our customers' interests, delivering higher quality and higher performance products and services.