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Coastal Copper Pipe Galvanic Corrosion — Aluminum Fin Contact

Likely causes

Copper pipe and aluminum fin direct contact + seawater (NaCl) moisture → galvanic cell formation

Check: Locate corrosion — find blue-green oxide or pinholes at fin-pipe contact areas; confirm if installation is within 1km of coast

What to do: Replace all corroded copper pipe sections → wrap EPDM tape at fin coil contact points → apply acrylic anti-rust spray to entire pipe exterior (reapply annually); consider stainless steel pipe for new coastal installations

Fin protective coating peeled off — exposed metal accelerates corrosion

Check: Visually inspect fin coating condition — peeled areas, discoloration, corrosion spots; check rainwater drainage (outdoor unit tilt 3–5° forward)

What to do: Apply gold-fin coating spray to repair damaged coating areas; ensure rainwater drainage (tilt unit 3–5° forward); routine annual anti-corrosion inspection

Field tip

For installations within 1km of coast, epoxy-coated fin coils are recommended — fin coating is the primary defense against galvanic corrosion

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