from the conferences organized by TANGER Ltd. provisional website
The present work deals with the possibility of the evaluation of the descaling rate of the AISI 304 stainless steel. The samples were pre-treated in the reduction melt containing NaOH, Na2O and NaH and the final pickling took place in the mixtures of acids. The cross – sections of the scales formed on the steel as received and those remained after reduction bath treatment and acid pickling were examined by using a scanning electron microscope. The surface analysis was performed by the Raman microspectroscopy and the presence of magnetite was proved for all the samples. The occurrence of this electroactive substance enabled using of the electrochemical methods (cyclic voltammetry, electrochemical impedance spectroscopy and chronocoulometry) for monitoring of the redox reactions taking place on the working electrode formed by the steel sample in 1 M NaOH solution. The application of whichever method provides a quick estimation of the pickled surface state.Keywords: Stainless steel pickling; Raman spectroscopy; voltammetry; chronocoulometry; electrochemical impedance spectroscopy
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