Corrosion Behavior of Chromized and/or Aluminized 9Cr-1Mo Steels in Medium-BTU Coal Gasifier Environment

摘要

The corrosion behavior of 9Cr-1Mo steels with chromized and/or aluminized coatings was investigated in a simulated, medium-BTU, coal gasifier environment at 600C. Those coatings containing aluminide layers were unsuitable for use in coal gasifier atmospheres because of severe cracking during the test, which induced internal sulfidation/oxidation of the base materials. Excellent corrosion protection was provided by a chromized coating, which successfully blocked the inward diffusion of sulfur and oxygen. 10 refs., 8 figs.