The influence of small amounts of KCl(s) on the high temperature corrosion of a Fe-2.25Cr-1Mo steel at 400 and 500°C
The influence of small amounts of KCl(s) on the high temperature corrosion of a Fe-2.25Cr-1Mo steel at 400 and 500°C
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DOI：
10.1002/maco.201005942
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发表时间：
2011-07-01
影响因子：
1.8
通讯作者：
Svensson, J-E
中科院分区：
文献类型：
--
作者：
Folkeson, N.;Jonsson, T.;Svensson, J-E
本文报道了低合金钢（Fe-2.25Cr-1 Mo）在400 ℃和500 ℃下，在少量KCl（s）存在下的氧化行为。将清洁和抛光的样品试样暴露在水平管式炉中，暴露时间为1小时至1周。烟气成分为5%O-2和40%H2O的N-2，暴露前样品上沉积0.1mg KCl/cm（2）。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和能谱分析（EDX）对样品进行了表征。用聚焦离子束（FIB）和宽离子束（BIB）制备了横截面。在400摄氏度时，在没有KCl的情况下有适度的质量增加。在KCl的存在下，质量增加显著增加，并且在短暴露时间后已经明显出现快速攻击。在500摄氏度下，在没有KCl的情况下的质量增加明显高于400摄氏度下的质量增加，特别是在暴露168小时后。KCl在较短的暴露时间内有效果，但一周后，暴露于KCl和不暴露于KCl的样品的质量增加幅度相当。
This paper reports the oxidation behaviour of a low-alloyed steel (Fe-2.25Cr-1Mo) in the presence of small amounts of KCl(s) at 400 and 500 degrees C. Cleaned and polished sample coupons were exposed in a horizontal tube furnace with exposure times ranging from one hour to one week. The flue gas composition was 5% O-2 with 40% H2O in N-2, and 0.1mg KCl/cm(2) was deposited on the samples prior to exposure. X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis were used to characterize the samples. Cross sections were prepared by means of focused ion beam (FIB) and broad ion beam (BIB). At 400 degrees C there was a modest mass gain in the absence of KCl. In the presence of KCl, mass gain is significantly increased and a rapid attack is evident already after short exposure times. At 500 degrees C, the mass gains in the absence of KCl were considerably higher than at 400 degrees C, especially after 168 hours of exposure. KCl had an effect at shorter exposure times, but after one week the samples exposed with and without KCl had mass gains of comparable magnitude.