Abstract
An investigation was carried out in our laboratory to study the effect of the microstructure of nickel-aluminum-bronze (NAB) alloy on its cavitation corrosion behaviour in seawater using a 20-kHz ultrasonic induced cavitation facility. Cavitation tests were made under free corrosion conditions as a function of exposure time in natural seawater. Optical and scanning electron microscopy showed NAB immersed in stagnant seawater suffered from selective corrosion of the copper-rich α phase at boundaries with intermetallic κ precipitates. The κ precipitates and precipitate-free zones did not suffer corrosion. Cavitation made the surface of this alloy very rough, with large cavities or pits, ductile tearing and corrosion of the boundaries of the α columnar grains. In addition, the number of cavities and their size increased with exposure time. Microcracks 5-10 μm long were observed in the α phase adjacent to κ precipitates along the cross-section of the material. Selective phase corrosion and cavitation stresses were considered to be the cause of the cracks observed.
| Original language | English |
|---|---|
| Pages (from-to) | 37-41 |
| Number of pages | 5 |
| Journal | Materials Characterization |
| Volume | 48 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 2002 |
Keywords
- Cavitation
- Corrosion
- Intermetallic
- Microstructure
- Seawater
Funding Agency
- Kuwait Foundation for the Advancement of Sciences
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