Takuity morinaga1, Hideo Nagasawa1
1滿洲輕金屬製造株式會社研究部
In the 2nd report (Nippon Kinzoku Gakkai-si, Vol. 5, No. 2, 1941), the authors reported the effect of the addition of a small amount of metals on the corrosibility of duralumin by measuring the volume change of H2gas which formed when the specimens were immersed in 10% HCl solution. The present experiments on corrosion-resistance were carried out in 3% NaCl+3% H2O2 solution by dip method, mesuring the loss in weight, and also the effect of various elements on intercrystalline corrosion was examined by the microscopic analysis. The results obtained maybe summarised as follows:-
(1) The added elements which improve the corrosion-resistance and intercrystalline corrosion of duralumin, were found to be Cr (<0.3%) and Sb (<0 7%).
(2) The addition of Co, Mo and W gives deleterious effect.
(3) The addition of other elements do not seem to improve the said properties.
(Received 1941/10/01)
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