해수 내 다양한 알루미늄 선박용 재료의 캐비테이션 진폭에 따른 캐비테이션-침식 손상 연구
Investigation on Cavitation-Erosion Damage with the Cavitation Amplitude of Al Alloy Materials in Seawater
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초록
Recently, 5000 series and 6000 series Al alloys have been used as hull materials for small and medium-sizedships because of their excellent weldability, corrosion resistance, and durability in marine environments. Al ships can navigate at high speed due to their light weight. However, cavitation-erosion problems causereducing durability of Al ship at high speed. In this investigation, 5052-O, 5083-H321, and 6061-T6 Alalloy materials were used to evaluate the damage characteristics with amplitude (cavitation strength). Asa result of the electrochemical experiments, the corrosion current density and corrosion potential of 6061-T6in seawater were 8.52 × 10-7 A/cm2 and –0.771 V, respectively, presenting the best corrosion resistance. The cavitation-erosion experiment showed that 5052-O had the lowest hardness value and cavitation-erosionresistance. 5052-O also had a very short incubation period. As the experiment progressed for 5052-O, pittingformed and grew in a short time, and was observed as severe cavitation-erosion damage that surface detached. Among the three specimens, 5083-H321 presented the highest hardness value and thedamage rate was the smallest after the initiation of pitting.
Abstract
Recently, 5000 series and 6000 series Al alloys have been used as hull materials for small and medium-sizedships because of their excellent weldability, corrosion resistance, and durability in marine environments. Al ships can navigate at high speed due to their light weight. However, cavitation-erosion problems causereducing durability of Al ship at high speed. In this investigation, 5052-O, 5083-H321, and 6061-T6 Alalloy materials were used to evaluate the damage characteristics with amplitude (cavitation strength). Asa result of the electrochemical experiments, the corrosion current density and corrosion potential of 6061-T6in seawater were 8.52 × 10-7 A/cm2 and –0.771 V, respectively, presenting the best corrosion resistance. The cavitation-erosion experiment showed that 5052-O had the lowest hardness value and cavitation-erosionresistance. 5052-O also had a very short incubation period. As the experiment progressed for 5052-O, pittingformed and grew in a short time, and was observed as severe cavitation-erosion damage that eliminatedin large quantities. Among the three specimens, 5083-H321 presented the highest hardness value and thedamage rate was the smallest after the initiation of pitting.
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