Corrosive-Wear Properties of Two NiAl Alloys in Sulfuric Acid Solution postprint

Abstract: The corrosion wear properties of NiAl-2.5Ta-7.5Cr-x(0, 1)B alloys in 5% H2SO4 solution have been investigated at room temperature. The results show that in comparison with NiAl-2.5Ta-7.5Cr alloy, NiAl-2.5Ta-7.5Cr-1B alloy exhibited better corrosion resistance to 5% H2SO4 solution with passive current density 0.299(μA·cm-2)and free corrosion potential -0.213 V. For which the key factor is that a passive film could form on the surface of NiAl-2.5Ta-7.5Cr-1B alloy. The corrosion wear rate of NiAl-2.5Ta-7.5Cr-1B alloy decreased 2-8 times compared with NiAl-2.5Ta-7.5Cr alloy. The abrasion erosion mechanism for NiAl-7.5Cr-2.5Ta-1B alloy was dominated by the synergistic effect of corrosion wear and protectiveness of passive film. While that for NiAl-7.5Cr-2.5Ta alloy was mainly corrosion wear and abrasive wear.