Method of testing the magnesium content of magnesium-treated...

Details Method of testing the magnesium content of magnesium-treated... Method of testing the magnesium content of magnesium-treated...

G - Physics

01

N

150/19

G01N 33/20 (2006.01) G01N 1/28 (2006.01) G01N 25/02 (2006.01)

Patent

CA 1331952

ABSTRACT A METHOD OF TESTING THE MAGNESIUM CONTENT OF MAGNESIUM-TREATED CAST IRON }n the manufacture of ductile iron it is important to know that the magnesium content is above (or possibly below) a threshold value. It is known that the presence of magnesium prevents tellurium causing solidification of a sample with carbidic eutectic arrest. Accordingly we treat a sample in a receptacle with a know quantity of sulphur (or selenium) such as just to neutralise the threshold quantity of magnesium, then we observe whether, on solidification, the eutectic arrest is graphitic (indicating that more than the threshold quantity of magnesium is present) or carbidic, indicating less magnesium. The observation is most simply done (and can be done semi-automatically) by timing a cooling curve between two predetermined temperatures.

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