a steel component is nickel plated to give corrosion protection. to increase the strength of the bond between the steel and the nickel, the component is heated for 4 h at 1000c. if the diffusion parameters for nickel in iron are do ¼ 1.9 104 m2 /s and qd ¼ 284 kj/mol, how far would you expect the nickel to diffuse into the steel in this time?