High Temperature Corrosion Behavior of Fe-(2, 9, 11) percent Cr Steels in SO_2-gas

摘要

In order to study the corrosion characteristics in coal-fired power plants, Cr-steels were corroded between 600 deg C and 900 deg C in Ar+0.2 percentSO_2 gas for up to 300 hrs, and their oxidation and sulfidation characteristics were studied. The corrosion resistance increased with increasing the Cr content. The major corrosion products were Fe_3O_4 and Cr_5S_6, indicating that both oxidation and sulfidation occurred simultaneously. The scales formed were bi-layered when the corrosion resistance were poor, while those formed were single-layered when the corrosion resistance were good.