Propeller & propulsion

 A marine propeller is with two or more blades connected to a hub, and the blade surface is a helical surface or an approximate helical surface. Propellers have a history of more than 200 years since they appeared in the 19th century. Marine propellers have always been the first choice for ship propellers because of their good hydrodynamic performance, high efficiency and other advantages. Their performance directly affects the performance of the entire ship. and promotion efficiency        

Since ship propellers are exposed to high-speed rotation for a long time, the service life of the propeller is an important factor that must be considered during the development process. The main factors that affect the service life of propellers are corrosion and marine biofouling.        

As gradually realize the seriousness of propeller corrosion and the application limitations of various external protection technologies, the research on new propeller matrix materials has gradually become a research hotspot.Since propellers need to meet the requirements for production, use and welding repair, the materials must meet the characteristics of high mechanical properties, good cavitation erosion resistance, and high seawater fatigue corrosion strength.Since the last century, copper alloy materials have played an important role in propeller materials due to their good mechanical properties and corrosion resistance, and are the main base materials of propellers.        

However, in recent years, due to the increasingly serious pollution of seawater and river water, the corrosion resistance of copper alloy propellers can no longer meet the protection requirements. At the same time, due to the large discharge of organic matter in seawater, which accelerates the reproduction of anaerobic sulfate-reducing bacteria, the sulfate in the seawater medium is reduced, producing sulfur ions that have a strong corrosive effect on copper alloys, causing the color of the propeller to turn black and the surface to become black, rough and the service life is shortened sharply.Therefore, the development of new materials to replace copper alloys has become a new research direction for propeller materials. New propeller materials, such as stainless steel, composite materials, etc., are increasingly favored by scholars, and their application proportion in propellers is also increasing year by year.        

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