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열처리에 따른 무전해 니켈 도금 층의 상변태 거동이 부식과 캐비테이션 침식에 미치는 영향

Effect of Phase Transformation Behavior of Electroless Nickel Plating Layer on Corrosion and Cavitation-Erosion with Heat Treatment

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주제분류금속공학

초록

The objective of this study was to investigate corrosion and cavitation-erosion characteristics of the electroless nickel plating layer with heat treatment. The crystallization temperature of the electroless nickel plating layer was about 410 oC. The phase transformation energy was confirmed to be 12.66 J/g. With increasing heat treatment temperature, the amorphous electroless nickel plating layer gradually changed to crystalline Ni and Ni 3 P. At the same time, the crystal grain size was also increased. Additionally, when heat treatment was performed at a temperature above 400 oC, NiO phase was observed due to oxidation phe-nomenon. As a result of the electrochemical polarization experiment, the corrosion resistance of the heattreated electroless nickel plating layers was superior to that of the as-deposited plating layer. This was because crystal grains became larger and grain boundaries decreased during heat treatment. The cavitationerosion resistance of heat-treated plating layers tended to be superior to that of as-deposited plating layers due to increased microhardness.

Abstract

The objective of this study was to investigate corrosion and cavitation-erosion characteristics of the electroless nickel plating layer with heat treatment. The crystallization temperature of the electroless nickel plating layer was about 410 oC. The phase transformation energy was confirmed to be 12.66 J/g. With increasing heat treatment temperature, the amorphous electroless nickel plating layer gradually changed to crystalline Ni and Ni 3 P. At the same time, the crystal grain size was also increased. Additionally, when heat treatment was performed at a temperature above 400 oC, NiO phase was observed due to oxidation phe-nomenon. As a result of the electrochemical polarization experiment, the corrosion resistance of the heattreated electroless nickel plating layers was superior to that of the as-deposited plating layer. This was because crystal grains became larger and grain boundaries decreased during heat treatment. The cavitationerosion resistance of heat-treated plating layers tended to be superior to that of as-deposited plating layers due to increased microhardness.

참고문헌 (27)

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