Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Electroless Ni-P Plating and Heat Treatments of the Coating Layer for Enhancement of the Cavitation Erosion Resistance of Vessel Propellers

선박 프로펠러의 케비테이션 침식 저항 향상을 위한 Ni-P 무전해 도금층 형성 및 열처리를 통한 미세조직 제어

  • Kim, Young-jae (Department of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Son, In-Jun (Department of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Yi, Seonghoon (Department of Materials Science and Metallurgical Engineering, Kyungpook National University)
  • 김영재 (경북대학교 금속신소재공학과) ;
  • 손인준 (경북대학교 금속신소재공학과) ;
  • 이승훈 (경북대학교 금속신소재공학과)
  • Received : 2017.04.19
  • Accepted : 2017.07.14
  • Published : 2017.08.27
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Abstract

For enhanced cavitation erosion resistance of vessel propellers, an electroless Ni-P plating method was introduced to form a coating layer with high hardness on the surface of Cu alloy (CAC703C) used as vessel propeller material. An electroless Ni-P plating reaction generated by Fe atoms in the Cu alloy occurred, forming a uniform amorphous layer with P content of ~10 wt%. The amorphous layer transformed to (Ni3P+Ni) two phase structure after heat treatment. Cavitation erosion tests following the ASTM G-32 standard were carried out to relate the microstructural changes by heat treatment and the cavitation erosion resistance in distilled water and 3.5 wt% NaCl solutions. It was possible to obtain excellent cavitation erosion resistance through careful microstructural control of the coating layer, demonstrating that this electroless Ni-P plating process is a viable coating process for the enhancement of the cavitation erosion resistance of vessel propellers.

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References

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