Water Vapour Effects on Fe-Cr Alloy Oxidation

作者：Othman Norinsan K; Zhang Jianqiang; Young David J^*

来源：Oxidation of Metals, 2010, 73(1-2): 337-352.

DOI：10.1007/s11085-009-9183-9

• Parabolic kinetics
• Alloy depletion
• Diffusion
• Scale-alloy interface

Isothermal oxidation at 700 A degrees C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was measured using continuous thermogravimetric analysis. All alloys developed thin, protective chromia scales in Ar-20O(2) (vol%). Chromia scale growth on the 17 and 25 Cr alloys was faster in Ar-20O(2)-5H(2)O and Ar-5O(2)-20H(2)O. In these gases, the Fe-9Cr failed to form a chromia scale and suffered rapid breakaway oxidation, growing iron-rich oxides instead. A low oxygen potential gas, Ar-10H(2)-5H(2)O caused chromia scaling on Fe-17Cr and Fe-25Cr, but internal oxidation of Fe-9Cr. Application of Wagner's criterion for sustaining external scale growth is shown to account satisfactorily for these observations.

• 出版日期2010-2