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김귀식,현창해,진희석 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
The hydraulic machinery of screw propeller and pump impellers is damaged by cavitation erosion in sea water. The cavitation erosion is a phenomenon lead to a functional disorder of various fluid machinery and drop off in efficiency by cavity fluid fluctuation. In this study is investigated the cavitation erosion of Zn and Al coatings made by thermal spraying methods. These metals are coated on substrate of high strength brass. Test specimens are immersed in 3.5% NaCl solution along 500 and 1000 hours, respectively. After pre-corrosion, the cavitation erosion test conducted on the coating specimens in 3.5% NaCl solution along 210 minutes. The cavitation erosion rates of the coating specimens were increased with pre-corrosion times. The weight loss Al coating was smaller than that of Zn. The weight loss rates of Zn and Al coating heavily increased at the initial stage of cavitation test, regardless of the test conditions.