The time required for water to rust bare unprotected metal depends heavily on oxygen exposure, ambient humidity, and mineral content, but visible surface oxidation can begin in as little as 24 to 48 hours under damp conditions. Inside a pressurized steel water heater tank, continuous contact with oxygenated water means gradual electrochemical corrosion occurs constantly over the 8 to 12 year lifespan of the unit, accelerating rapidly once the sacrificial anode rod is fully depleted. Verification: Keep the exterior of your water heater dry and maintain protective anode rods.
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