Method for testing and determining the alloy class of an aluminu

Details Method for testing and determining the alloy class of an aluminu Method for testing and determining the alloy class of an aluminu

1997-09-30

1999-05-25

Soderquist, Arlen

Chemistry: analytical and immunological testing

Metal or metal containing

436166, 436182, G01N 3320

Patent

active

059069457

ABSTRACT:
A method for testing and determining the alloy class of an aluminum alloy may be simply and easily carried out, for unequivocally determining the correct alloy class among the aluminum alloy classes 2XXX, 5XXX or 6XXX, and 7XXX, of the test sample. According to the method, the material sample is dissolved in hydrochloric acid (HCL) to prepare a first solution, then nitric acid (HNO.sub.3) is added drop-wise to the first solution in order to cause oxidation of any insoluble copper (Cu) therein and form a second solution, then a potassiumhexacyanoferrate (II) solution (K.sub.4 discoloration and precipitation reaction and form a final resulting solution. Finally, the applicable alloy class of the tested material sample is determined by visually categorizing the color and precipitation state of the resulting solution. A brown cloudy solution indicates a 2XXX alloy, a gray-green cloudy solution indicates a 7XXX alloy, and a blue or green transparent solution indicates a 5XXX or 6XXX alloy.

REFERENCES:
patent: 3652225 (1972-03-01), Coffin, Jr. et al.
patent: 3701631 (1972-10-01), Wilson
patent: 4783417 (1988-11-01), Genna
F.J. Bowen Steel, 1952, pp. 67&74.
W.P. Iverson Nature 1967, 213, 486-487

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