How to prevent corrosion of valves under insulation layers
Thread Content
This post was last edited by Wang Wei2 on 2026-3-27 at 17:58. The following are valves with insulation; it can be seen that the metal surface beneath the insulation layer is severely corroded. What methods can be used to prevent corrosion?
To prevent corrosion of valves beneath the insulation layer, the following measures can be taken: 1. **Implement proper surface anti-corrosion treatment** – Before applying the insulation layer, thoroughly clean the metal surface of the valve and apply a heat-resistant and moisture-proof anti-corrosion coating (such as epoxy zinc-rich primer or heat-resistant aluminum powder paint). 2. **Use a waterproof sealing layer**: Install a waterproof aluminum or stainless steel protective layer outside the insulation layer, and seal the joints with sealant to prevent moisture from penetrating. 3. **Choose breathable insulation materials** – Avoid using insulating materials that absorb moisture easily (such as rock wool, which requires a moisture-proof layer), and opt for hydrophobic materials instead (such as closed-cell rubber plastics, aerogel mats, etc.). 4. **Install a moisture barrier** – Add a moisture-proof layer between the metal surface and the insulation layer (such as aluminum foil tape or waterproof membrane) to prevent condensation from coming into contact with the metal. 5. **Regular inspection and maintenance** Regularly remove part of the insulation layer to check for corrosion, and promptly repair any damaged waterproofing or insulation layers. 6. **Design of drainage structure**: For vertical pipe valves, drainage holes can be designed at the bottom of the insulation layer to prevent water from accumulating. The key is to use a combination of \"anti-corrosion coating + waterproof sealing + moisture-proof design\" to prevent water, oxygen, and corrosive substances from coming into contact with the metal surface. .
The idea is good, but epoxy zinc-rich primers should be avoided