Chlorine Corrosion Degradation of Low Alloyed Ferritic Steels in Temperature Range 450–550 °C

Abstract

The paper shows the results obtained under chlorination conditions on low alloyed steels 15HM (T/P12), 16M (T/P1), 18K, and 10HM2 (T22) in the temperature range 450–550 °C for 100 h. The tests were performed in a gas mixture of 0.3 % Cl2–Ar under 1 bar pressure. The results indicated that the low alloyed steels underwent a high degree of corrosion, showing lack of protection under reducing atmosphere. However, some differences regarding chemical composition of the bare steels were found. The scale thicknesses, chemical compositions of chloride scales developed on the exposed samples were analysed by means of standard techniques including scanning electron microscope coupled with energy X-ray dispersive spectroscopy.