Duralumin, Its Properties and Uses Page: 15 of 22
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N A.C.A. Technical Memorandum No. 284
..ng metal, in order to prevent the deterioration of the rivet heads
through galvanic action.
The chemical characteristics of duralunmin differ from those of
]pure aluminum. This subject does not, however come within the
scope of the present article. It is noteworthy that duralumin, un-
liike pure aluminum, is not readily affected by mercury.
The resistance of duralumin to the corrosive action of sea wa-
ter is relatively good. it is better than that of any other known
light metal. iron in combination with duralumin protects the lat-
ter from the action of sea water. Detailed experiments, made by
the Berlin Municipal Department for Hygienic and Economic Research,
demonstrated that duralumin is not injurious to health and is there-
fore suitable for the manufacture of cooking utensils.
The resistance of duralumin to atmospheric action is good-
Through experiments covering a period of about five years, it was
found that specimens in the form of rods of 10 mm (.39 in.) diameter,
flat bars of 5 (.197) and 2 mm (.0787 in.) thickness and wires of
5 and 2 nmm diameter suffered no loss in strength and ductility.
They hung the year round on the roof of one of our factory buildings
exposed to all sorts of weather.
The strength and ductility of duralumin are favorably affected
by temperatures below the freezing_.point of water. - The.strength in-
creases with decreasing temperature. In an experiment at -19000
(-3100F), the strength was found to have increased from 42 kg/mm2
to 53 kg/nmmn2 (59739 to 75385 Ib./sq.in.) and the elongation from 221 LL
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Beck, R. Duralumin, Its Properties and Uses, report, October 1924; (https://digital.library.unt.edu/ark:/67531/metadc58745/m1/15/: accessed March 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.