High temperature corrosion and corrosion protection of porous Ni22Cr alloys

• corrosion kinetics of porous IN625 alloy is studied in the temperature range of 700 °C–800 °C
• corrosion kinetics of porous IN625 alloy is studied in air and hydrogen atmosphere for up to 1000 h
• method of reducing corrosion rates of porous alloys by the infiltration of rare earths elements (Y, La, Gd, Ce) is shown
• modification by the yttrium precursor reduces corrosion rate by a factor of 50

In this work corrosion kinetics of the porous IN625 alloy is studied in the temperature range of 700 °C–800 °C in air and humidified hydrogen for up to 1000 h. Moreover, an effective and simple method of reducing corrosion rates of porous alloys by the infiltration of the rare earth elements is shown. Modification by the yttrium containing precursor reduces the corrosion rate by a factor of 50 in air at 700 °C so that the lifetime of the infiltrated alloy is greatly extended.