INFLUENCE OF MnS INCLUSIONS ON THE CORROSION OF AUSTENITIC STAINLESS STEELS

The influence of alloy sulfur on the crevice solution chemistry and the nature of the surface in the crevice during initiation were Investigated Two austenitic steels with different amounts of sulfur in the alloy. AISI 316L and SS 2343. were compared using electrochemical measurements with an additional standard test ASTM G48 The electrochemical measurements. i e. potentiodynamic measurement, a linear polarization and a Tafel polarization, were performed in a typical corrosion solution of 3 5 % NaCl and 0 1 % NaCl The results show the difference for the steels in a low concentration of Cl(-) ions, while in the higher concentration of the ions the steels act very similarly The MnS inclusions were analyzed and characterized using high-resolution SEM with EDX elemental analyses The SE images show large differences for these materials in terms of the amount of inclusions From the EDX measurements it was confirmed that the inclusions consist of Mn and S. and very few other types of inclusions were found