To obtain an alloy excellent in creep resistance without making the atmosphere into the nonoxidizing one by using a master alloy composed of specified ratios of zinc and manganese.
A zinc-manganese master alloy composed of, by weight, 60 to 95% zinc and 5 to 40% manganese is used. A prescribed amt. of high purity manganese is placed on the bottom of a crucible, and the molten metal of zinc is poured thereon to cover manganese, and heating and alloying and executed. Preferably, for preventing combustion, flux having a compsn. of MgCl2: KCl:NaCl=1:(0.5 to 3):(0.5 to 3) is placed on the molten metal, which is heated at 600 to 950°C to obtain a zinc-manganese master alloy. By adding the molten metal of pure zinc or a zinc alloy held to 450 to 700°C with the zinc-manganese master alloy of 5 to 40 wt.% manganese content, a zinc-manganese base zinc alloy is produced. The additional incorporation of one or more kinds of copper and Nickel of ≤2 wt.% or one or more kinds of aluminum and titanium of ≤1 wt.% is also suitable.
SATO TSUTOMU
OGAMI TAKASHI
KUBOTA KOHEI
