| 摘要 |
An electrochemical method of determining the content of alloying elements in a metal melt uses the oxygen equivalent required to completely oxidise the particular metal in a voltammetric titration as a measure of the quantity of the element. For the titration end product, the oxygen concentration in the melt rises sharply to a higher value corresponding to the Me/MeO equilibrium of the next nobler alloying metal, with the result that an O-sensitive solid electrolyte probe, for example ZrO2 can be used to indicate it, it being possible to connect the probe and an unchanging reference electrode so as to form a galvanic cell [O]reference/ZrO2/[O]melt having a measurable EMF. For example, a test melt to be analysed is continuously drained from a casting pot (1) and, while a known amount of oxygen, which can be checked by means of a gas meter (4), is injected, it is fed to a measuring tube (2) which is heated by a furnace (8). In the measuring tube, a probe (7) measures the O concentration in the flowing melt. Deviations from a set EMF which is kept constant correspond to deviations of the test melt from the specified concentration; their magnitude can be determined by changing the flow rate with the regulator (3). <IMAGE>
|
