1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers.
2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio.
3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence.
4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials.
5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries.
6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult.
Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their:
- High strength and durability
- Excellent corrosion resistance
- Good cavitation resistance
- Ease of casting and machining
- Weldability
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