Stainless steels rely on their passive film for corrosion protection in saline environments and localised disruption of the passive film can lead to high local rates of material loss. Materials which exhibit passivity in static conditions are often susceptible to erosion-corrosion under severe hydrodynamic regimes. In this paper the corrosion behaviour of two superaustenitic (UNS S31254 and UNS S32654) and one superduplex (UNS S32750) stainless steels was examined in static conditions at a range of temperatures from 18 °C to 70 °C and during exposure to an impinging saline jet containing varying concentrations of solid particles. In static conditions the materials exhibit decreasing resistance to passivity breakdown as the temperature is increased and a critical breakdown temperature for UNS S31254 and UNS S32750 was identified. Under liquid-solid impingement the materials exhibit an active regime near to the free corrosion potential followed by a stabilised current regime as more positive potentials. The complex electrochemical response is dependent on the material grade and the solid particle concentration. Also in the paper assessment of the 'recovery' of the stainless steels after exposure to slurry impingement is addressed. © WILEY-VCH Verlag GmbH, 2001.
|Number of pages||9|
|Journal||Werkstoffe und Korrosion|
|Publication status||Published - 2001|