Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of shot peening stand-off distance on electrochemical properties for surface modification of ALBC3 alloy

ALBC3 합금의 표면 개질을 위한 쇼트피닝 분사거리가 전기화학적 특성에 미치는 영향

  • Han, Min-Su (Division of Marine System Engineering, Mokpo Maritime University) ;
  • Hyun, Koang-Yong (Department of Materials, Physics and Energy Engineering, Graduate School of Engineering Japan, Nagoya University) ;
  • Kim, Seong-Jong (Division of Marine System Engineering, Mokpo Maritime University)
  • 한민수 (목포해양대학교 기관시스템공학부) ;
  • 현광용 (일본 나고야대학 물리.에너지공학) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2013.09.24
  • Accepted : 2013.10.28
  • Published : 2013.10.31
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Abstract

In the case of casting materials or ductile materials for marine equipment, it is common to employ a surface modification for achieving cost reduction and improvement in strength. In particular, aluminium bronze ALBC3 exhibits excellent corrosion resistance, and thus widely used for marine application. However, application of the material under high-velocity seawater flow may induce electrochemical corrosion damage and physical damage such as cavitation erosion, leading to shorter service life of equipment. In this study, surface modification was carried out on ALBC3 alloy for different shot peening stand-off distances, and the physical hardness and electrochemical characteristics before and after modification were investigated. The results in each case showed the hardness increase in comparison with non-peened specimen, and the maximum hardness improvement(50 %) was found in 10 cm of shot-peening stand-off distance. It is observed that the electrochemical characteristics were irrelevant to application of shot peening.

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