Nickel-aluminium bronze (NAB) alloys are commonly used for marine applications, such as different types of Pumps, valves, propellers etc. These NAB materials are conventionally manufactured by using casting techniques. The following literature review is discussion about the defects analysis of NAB alloys castings (nominally) [Cu-9Al-5Ni-4Fe-1Mn] composition. This composition of castings alloy is widely applied for marine applications due to its corrosion resistance, mechanical strength and good cast ability. It has been observed that the turbulence and filling velocity are determining factors that majorly impact on casting performance and due to, the casting defects are generated. After a long study of UNS C95810 alloy castings or NAB materials, it has been observed that the corrosion rate of the alloy is higher in seawater and an investigation was conducted by weight loss determination, scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), X-ray diffraction (XRD) and electrochemical testing of the specimen collecting from the damaged materials used in ship yard and observed that no changes found in the chemical composition the corrosion is so high.