Investigations on susceptibility to intergranular corrosion of thermo‐mechanically rolled corrosion‐resistant materials 316L and Alloy 825

Abstract

The influence of parameters of a thermo‐mechanical rolling process on corrosion properties of materials 316L and Alloy 825 was studied by means of the DL‐EPR‐method and a conventional corrosion test. Prior to polarization measurements, optimization of the DL‐EPR‐method was conducted. SEM was used to characterize microstructure and type of attack before and after corrosion testing. A strong correlation between annual corrosion rates and DL‐EPR‐test results was obtained. Due to the low tendency of both alloys to form corrosion‐promoting precipitates, the applicable range of process parameters for both alloys is large and the fabrication process in general is not critical.

The Mechanism on the B Addition to Regulate Phase Precipitation and Improve Intergranular Corrosion Resistance in UNS S31254 Superaustenitic Stainless Steels

“…Some studies have reported that the IGC of high nitrogen stainless steel can be detected in a solution of 2 M H 2 SO 4 , 1 M NaCl and 0.01 M KSCN with a scan rate of 1.667 mV/s. 22 Several studies have determined the IGC of UNS S32750 via an adjusted DL-EPR method in a solution of 2 M H 2 SO 4 and 1.5 M HCl at 30°C with a scan rate of 1.5 mV/s. 23 Some studies have also indicated that the IGC of S32654 super austenitic stainless steel can be measured using an advanced electrochemical potentiokinetic reactivation method.…”