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Tungsten heavy alloys (WHAs) achieve a special combination of properties, such as high density, high mechanical strength and good corrosion resistance in the industrial and military applications. In this study, the corrosion performance of two WHAs, 90%W-6%Ni-4%Cu and 95%W-3.5%Ni-1.5%Fe has been investigated by immersion test and electrochemical test. The AFM results indicated the attack would be on the W phase in W-Ni-Cu alloy when it generated galvanic corrosion, W-Ni-Fe alloy revealed opposite result. Potentiodynamic polarization measurement showed pH value is an important factor in corrosion rate. The two types alloys showed relatively lower corrosion rates in DI water, as compared to 0.6MHCl solution. The corrosion mechanism was involved in the release of the metallic components and generation of corrosion products in term of SEM and EDX.