The corrosion behavior of several heat resistant materials in air + 2% Cl2 at 300 to 800 °C. Part 2 – Nickel base alloys

The corrosion behavior of the alloys 59, C-2000 and HR-160 was investigated in dry air and in air with 2% Cl 2 at temperatures of 300 to 800 °C. Up to 500°C Alloy 59 and Alloy C-2000 do not exhibit any significant attack. At 650°C in particular HR-160 is subjected to a marked increase of the corrosion rates. In the latter case the higher amount of C compared to the other two alloys seems to decrease corrosion resistance. At 800°C the resistance of C-2000 is inferior to that of Alloy 59 which is attributed to differences in the microstructure consisting of Cr/Mo precipitates in the Ni-base matrix which are primarily attacked.