The fiber-reinforced plastic (FRP) ships, including small fishing boats, have many environmental and recycling problems, and there is no method to decommission an FRP ship. If aluminum were used as a substitute for FRP in ships and boats, the result would be more environmentally friendly vessels that are easy to recycle and have the added value of reduced fuel consumption, higher speed, and increased load capacity. In this study, we investigated the mechanical and electrochemical properties of aluminum alloy. Aluminum alloy do not corrode due to the formation of an anti-corrosive passive film, such as Al₂O₃ or Al₂O₃·3H₂O, which resists corrosion in neutral solutions. In seawater, however, Cl^- ions destroy this passive film. The optimum protection potential range with regards to hydrogen embrittlement and stress corrosion cracking was determined to lie between -1.1 and -0.7 V (vs. Ag/AgCl). These results can be used as reference data for ship design.

This research was financially supported by the Ministry of Commerce, Industry and Energy (MOCIE) and Korea Industry Technology Foundation (KOTEF) through the Human Resource Training Project for Regional Innovation.

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