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Which of the following alloy has high cavitation resistance that usually used for ship propellers and pumps impellers in seawater?(a) Titanium(b) Stellite(c) 17-7 Stainless steel(d) Nickel aluminum bronzeThe question was posed to me in semester exam.Enquiry is from Environments in section Other Environments of Corrosion Engineering

Answer»

Right ANSWER is (b) Stellite

Easy explanation: Stellite is a cobalt-chromium alloy with HIGH cavitation resistance that usually used for ship propellers and pump IMPELLERS in seawater. Composition of Stellite is 27–32% chromium, 4–6% tungsten, 0.9–1.4% CARBON, with additions of nickel, iron, silicon, manganese, and molybdenum and cobalt as balance.



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