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Corrosion behaviour of graphite and stainless steels in phosphoric acid.

Iken, Hicham and Guenbour, A and Basséguy, Régine and Ben Bachir, A. Corrosion behaviour of graphite and stainless steels in phosphoric acid. (2005) In: 7th European Symposium on Electrochemical Engineering, 3-5 october 2005, Toulouse .

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Abstract

Corrosion behaviour of graphite and stainless steels was examined in phosphoric acid by electrochemical methods (polarization curves, impedance spectroscopy and SVET). Potentiodynamic curves showed that graphite exhibit an excellent resistance in the acid solution. Effect of the presence of chloride and sulphide ions in 40% H3PO4 solution was also investigated at 20°C and 80 °C. At elevated temperature, the current densities increased in the presence of aggressive impurities. Although stainless steels exhibited a good passive behaviour, the best corrosion resistance in chloride and sulphide contaminated H3PO4 was shown for the graphite. Subsequently, the current density at the surface was detected by scanning vibrating electrode technique (SVET). From the data obtained, graphite surface manifested a distinctive behaviour from that of stainless steels.

Item Type:Other Conference
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université Mohammed V Agdal - Faculté de sciences de Rabat (MOROCCO)
Laboratory name:
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Deposited By: Regine BASSEGUY

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