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.

• 김영재(경북대학교 금속신소재공학과) | Young-jae Kim (Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea)
• 손인준(경북대학교 금속신소재공학과) | In-Jun Son (Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea)
• 이승훈(경북대학교 금속신소재공학과) | Seonghoon Yi (Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea) Corresponding author