Abstract
The influence of various concentrations of HNO 3 (10, 20, 35 and 65%) at 298 K on the corrosion resistance of powder metallurgy (P/M) fabricated AISI 304L and AISI 316L austenitic stainless steels has been studied. For comparison purposes a simultaneous study was carried out on similar composition cast AISI 304L and AISI 316L steels. Electrochemical spectroscopy was the technique chosen for this investigation and values for the Tafel slopes and the Stern-Geary constant B were obtained using polarization resistance. The sintered AISI 304L and AISI 316L steels had similar corrosion rates, with the highest being observed in the 65% HNO 3 solution. The differences in corrosion rates between the P/M and cast steels are of two orders of magnitude. The attack on the P/M specimens is in the pores whilst negligible corrosion is observed on the cast materials.
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