The 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, the result would be more environmentally friendly vessels. Therefore, the Al alloy was carried out to prevent corrosion with solution heat treatment. The optimal heat treatment involved heating specimens for 120 minutes at 420 °C. In addition, the optimal aging condition involved aging specimens for 240 min. at 180 °C. The SSRT in seawater revealed that heat treatment under optimal conditions produced improved elongation, time-to-fracture and amount of dimples.

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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