Abstract: An Fe-Mn steel sheet plated with an electrodeposited lower layer of Zn or a Zn alloy and as an upper layer at least 0.5 g/mn.sup.2 of an Fe-Mn alloy with a manganese content of no more than 60% by weight, electrodeposited on the lower layer, has improved corrosion resistance.

Abstract: Nonmetallic catalyst compositions for oxidation of ammonia have the formula of Fe.sub.2 O.sub.3 -MAl.sub.2 O.sub.4 -Bi.sub.2 O.sub.3 -Ce.sub.2 O.sub.3. Herein, M represents Mg, Mn, Ca, Sr or Ba. MAl.sub.2 O.sub.4 is a spinel and has a role of carrier as well as that of assistant catalyst. Fe.sub.2 O.sub.3 acts as main catalyst, Bi.sub.2 O.sub.3 as assistant catalyst and Ce.sub.2 O.sub.3 as stabilizer to extend the effective temperature range of the function of catalyst compositions. In the formula, the ratio of each component is as follows:Fe.sub.2 O.sub.3 : 10-40 wt % of spinelBi.sub.2 O.sub.3 : 3.5-6 wt % of spinelCe.sub.2 O.sub.3 : 0.5-2 wt % of spinel.