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Electrochemical sensors for a continuous determination of aluminium and phosphorus activity in steel
Author(s) -
Borgianni Carlo,
Pistelli Maria Ilaria
Publication year - 1999
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199905599
Subject(s) - electromotive force , aluminium , electrochemistry , reproducibility , logarithm , phosphorus , sensitivity (control systems) , analytical chemistry (journal) , metallurgy , work (physics) , chemistry , linear relationship , materials science , thermodynamics , electrical engineering , mathematics , chromatography , engineering , electronic engineering , electrode , physics , mathematical analysis , statistics
In the present work, two types of electrochemical sensors are described for an on line and continuous measurement of aluminium and phosphorus activity in liquid steel. Sensitivity, reproducibility, response speed and working life are investigated. At 1873 K, data of electromotive force (EMF) vs. Al and P concentrations in liquid steel are obtained for a phosphorus content from 0.001 up to 0.5% and aluminium content from 0.001 up to 0.05%. These data show that a linear relationship exists between the logarithm of the Al and P concentration and the measured EMF. Equilibria related to the P and Al sensors involve 5 and 3 electrons respectively. Taking into account the observed sensitivity and the working life, these sensors can be used for continuous and online control.