The coupling effect of cavitation-erosion and corrosion for HVOF sprayed Cu-based medium-entropy alloy coating in 3.5 wt.% NaCl solution

• DOI: 10.1016/j.jmrt.2023.06.109
• Publication Date: 2023-06-16T09:20:27Z
• Authors: Jie Cheng; Yuping Wu; Shuaishuai Zhu; Sheng Hong; Jiangbo Cheng; Yujun Wang
• Keywords: Coupling effect; Corrosion; Mining engineering. Metallurgy; HVOF spraying; Cavitation-erosion; TN1-997; 02 engineering and technology; Cu-based MEA coating; 0210 nano-technology

Ship propellers suffered from serious coupling damage of cavitation-erosion (CE) and corrosion when operated with high-speed in the marine environment. To improve CE-corrosion resistance Ni-Al bronze (NAB) propeller alloy, a novel Cu-based medium-entropy alloy coating (Cu55Al20Ni12Ti8Si5, at.%) was prepared by high-velocity oxygen-fuel spraying technology this study. The characteristics CE behavior NAB were comparatively investigated, then mechanism discussed analyzing morphologies. influence on effect between further elucidated electrochemical experiments. results indicated that as-sprayed mainly comprised BCC solid solution phase NiTi-rich precipitates, which possessed higher hardness (6.73 ± 1.23 GPa) superior resilience (27.0%) than NAB. cumulative mass loss rate for after 18 h distilled water 3.5 wt.% NaCl only 38.7% 80.6% NAB, revealing better anti-CE performance coating. preferential matrix around fatigue fracture lamellar spalling summarized as main solution. had significant resulted degradation both two materials. led to remarkable loss, mechanical rather ascribed be dominated factor