Abstract
Various sort of “Zamak” (Zn-Al-Cu alloys) have been prepared with the zinc of various purities produced in this country and the change of length as well as the change of the impact value and the hardness of the specimens during 95°-steam test have been measured.
The re-electrolysed zinc A, having the purity of 99.99%, proved to be suitable for the preparation of all sorts of “Zamak” without decaying phenomena,The zinc B, having the purity of 99.98%,may also be used for Zamak,if a suitable amount of magnesium is added.
As the Zamak 3 proved to be least sensitive to the decaying phenomena amony the alloys tested some what lower grade electrolytic zinc may also be used for this alloy.
The effect of cadmium on various kinds of Zamak have been studied and it is shown that the addition it not favorable to the decaying phenomena, especially in the range of 0.3∼0.5% of cadmium.
