Effect Of Salinity On The Corrosive Wear Behaviour Of Engineering Steels In Aqueous Solutions

The effect of salinity is assessed on the corrosive wear behaviour of a low-alloy steel (UNS G43400) and three stainless steels (UNS S15500, UNS S31600 and UNS S32760). Erosion-corrosion testing was conducted using a submerged impingement slurry jet test-rig. Three salinities were evaluated; 0.05%NaCl, 3.5%NaCl and 10%NaCl. Total volume losses (TVL) and a volumetric analysis technique were used to assess the damage in the directly impinged zone (DIZ) and outer area (OA). Under all measured parameters, material loss for the stainless steels increased marginally with increased salinity. In terms of TVL and OA volume loss, the low alloy steel exhibited significantly greater material loss from 0.05%NaCl to 3.5%NaCl conditions, however, no further increase was evident when the salinity was raised to 10%NaCl.