The Effect of SO 2 and NaCl on High Temperature Hot Corrosion

Sea salt ingested into gas turbines in a marine environment may result in the transient deposition of in a film on hot gas path components under certain conditions. It has been found in laboratory studies that the corrosion behavior of high temperature alloys, such as IN 738, IN 713C, IN 100, and Ni‐30Al , toward such salt deposits is strongly influenced by the chemical composition of the gaseous environment. When is present together with small concentrations of in in an oxidizing atmosphere, these alloys are rapidly attacked at around 750°C, whereas much less corrosion occurs when either or is absent. It appears that gaseous chlorine formed during sulfation of plays an important role in initiating attack which is subsequently propagated by the presence of a liquid phase.