Which consequence results from prolonged exposure to seawater for wrought iron components in a Roman ballista?

💡 Explanation

When wrought iron is exposed to seawater, graphitic corrosion occurs because iron atoms selectively dissolve, leaving behind a porous matrix of graphite and iron oxides, reducing the material’s structural integrity. Therefore graphitic weakening occurs, rather than work hardening, passivation, or galvanic protection which involve different electrochemical processes.

• Which structural benefit did interlocking brick construction provide to 18th-century shipyards?
• Which benefit resulted from al-Khwarizmi's rules for transposing terms in algebraic equations?
• Which structural vulnerability manifested when Roman fortresses’ mortar aged and leached calcium hydroxide?
• Which risk increases when a 18th-century navigator sights the sun using a sextant with a warped index mirror?
• Which risk increases when laying Roman roads across areas high in organic matter like swamps?
• Which risk increases when prolonged undermining erodes a castle's foundation during a siege operations?