The time required for metal to rust underwater depends heavily on dissolved oxygen levels, water temperature, mineral content, and metal composition, but electrochemical oxidation and surface scaling can begin within 24 to 48 hours under aggressive conditions. Inside a pressurized steel water heater tank filled with oxygenated water, continuous contact drives progressive corrosion over an 8 to 12 year lifespan. This oxidation accelerates exponentially once the sacrificial anode rod is fully depleted. Verification: Inspect the tank interior and anode rod condition during routine annual maintenance checks.
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