Intermetallic layer formation at 750°C for 300 s. At (%) at various locations are (A) 99.3%Fe, 0.7Al, (B) FeAl3 ratio with Zn 3 to 3.4%, (C) Al : Fe ratio in the range 3.6 : 1 to 4.1 : 1, Zn 0.4 to 1.3, (D) 0.4Fe, 93.3Al, 5.4Zn, (E) 80.4Al, 18.8Fe, 0.9Zn.
