Question

Metal Zr can oxidise to form ZrO2. Write the oxidation reaction. Do you expect the oxide layer formed on the surface to be protective and why? Schematically draw and name the likely relationship between Δη (the weight gain per unit area) and t (time) for this oxidation. (The density of Zr is 6.51 g/cm3 and the density of the oxide is 5.89 g/em. The atomic weights of Zr and O are 91 and 16 g/mol, respectively)

Answer 1

Oxide matal den Vol-ma metl Mass dansi de m aSS metal MaSS dens 6.5 P8-R - 15 Protecive ( mad oxi«a. a.bove lorh is Sald to be Protecbve

ain 0- rabolic tima t Yelcion gm2 entrolledby imic diffusion. 5