Tests reveal improved corrosion resistance in friction surfaced nickel-aluminum bronze with silica sand, suggesting better marine performance.
Cast nickel-aluminum bronze (NAB) alloy is a material which is specified for most of the marine applications and propellers of ship, because of its exceptional corrosion-resistance joined with tolerable mechanical properties. However, the corrosion- erosion resistance of Cast nickel-aluminum bronze (NAB) alloy is relatively not good as wrought nickel-aluminum bronze alloy. Hence, in this research an effort has been taken to improve the corrosion- erosion resistance of cast nickel-aluminum bronze alloy deposit wrought (extruded) NAB alloy by friction surface technique. Erosion–corrosion tests have been carried out on slurries mixed with sand particles of having 3.5 % Nacl solution. Silica sand is having a average size range of 250–355 µm is used as an erodent. The specimens were tested at 30° & 90° impingement angle. It is observed that the erosion–corrosion resistance of friction surfaced NAB alloy exhibited improved resistance than cast NAB alloy. SEM analysis showed that the erosion tracks developed in the cast NAB alloy were wider and deeper than that formed over the friction surfaced extruded NAB alloy
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