無電解ニッケル-リンめっきのキャビテーション・***ージョン性および生物付着性

概要

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Cavitation erosion and biofouling have been serious problems for using ship propellers. In this paper, we firstly propose a technique to prevent cavitation erosion using electroless nickel-phosphorus plating (ENP). ENP was plated on JIS CAC703 (Ni-Al Bronze). We examined the anti-cavitation property of ENP by a vibratory cavitation apparatus based on ASTM G32. It was found that the mass loss of plated substrate can be decreased ten times less than that of substrate by selecting suitable heat treatment temperature for the concentration of phosphorus in ENP. The erosion mechanism of ENP is also discussed. Secondly, we report biofouling properties of ENP plated on CAC703. Specimens plated ENP and that made of CAC703 were immersed in Orido bay in Shizuoka prefecture for half a year and were observed the situations of biofouling, mainly caused by barnacles. The quantity of barnacles clinging to ENP was smaller than that of CAC703. It was found that the barnacles clinging to ENP have almost dropped after several months and those not dropped could be detached easily. The quantity of biofouling in the specimen coated low phosphorus ENP as plated was smallest of all the specimens.
独立行政法人海上技術安全研究所の論文
2011-06-30