Coastal Salt-Mist Anti-Corrosion Design for Prefab Cabin AC

Corrosion Mechanism and Protection Class

Coastal airborne chloride can reach 0.1–1 mg/m³ and condensation pH can drop to 3–4, pitting normal cold-rolled steel. HCK coastal units are built to ISO 12944 C5-M (marine) with a 15-year target life.

Materials and Surface Treatment

Enclosure in 316L stainless or AZ150 alu-zinc steel; A4-70 stainless fasteners avoid galvanic corrosion.
80 μm epoxy primer + 60 μm polyurethane topcoat, passing ASTM B117 1000 h neutral salt spray with no red rust.
Conformal-coated PCB, IP55 rating, and hydrophilic anti-corrosion fin coating on the coil.

See the prefab cabin solution or contact Haocheng Industrial Control for turnkey delivery.

FAQ

How often should coastal prefab AC get anti-corrosion maintenance?

Flush coil salt dust every 3 months and check coat thickness and fastener torque yearly; in heavy salt areas shorten to every 2 months.

Is 316L much better than 304 stainless in coastal use?

304 suffers pitting and intergranular corrosion under chlorides; 316L has higher PREN thanks to molybdenum, so coastal duty mandates 316L.

Coastal Salt-Mist Anti-Corrosion Design for Prefab Cabin AC

Corrosion Mechanism and Protection Class

Materials and Surface Treatment

FAQ

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