Corrosion of a stainless steel and nickel-based alloys in high temperature supercritical carbon dioxide environment
Corrosion of a stainless steel and nickel-based alloys in high temperature supercritical carbon dioxide environment
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DOI：
10.1016/j.corsci.2012.11.041
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发表时间：
2013-04-01
影响因子：
8.3
通讯作者：
Allen, T. R.
中科院分区：
文献类型：
--
作者：
Firouzdor, V.;Sridharan, K.;Allen, T. R.
在650 ℃和20 MPa的超临界二氧化碳中研究了四种合金的腐蚀，特别是AL-6XN不锈钢和三种镍基合金，PE-16，Haynes 230和合金625。试验暴露时间长达3000 h，每隔500 h取出样品进行分析。通过重量变化测量评价合金的腐蚀性能，并通过扫描电子显微镜、X射线衍射和X射线光电子能谱表征表面氧化层。增重测量表明，Al-6XN不锈钢表现出最低的耐腐蚀性，而其它合金的增重几乎相似。AL-6XN不锈钢的氧化层由大的等轴晶Fe 3 O 4（磁铁矿）外层和FeCr 2 O 4内层组成。即使在暴露500 h后，在该不锈钢中也观察到氧化物溅射。在所有合金中，富铬的氧化物相Cr2 O3和Cr1.4Fe0.7O3被确定为保护层。在合金PE-16中，形成了一层氧化铝薄层，从而提高了合金的耐腐蚀性。Cr2 O3被认为是Haynes 230和625镍基合金中的主要保护氧化层。(C)2012爱思唯尔有限公司保留所有权利。
Corrosion of four alloys has been studied in supercritical carbon dioxide at 650 degrees C and 20 MPa, specifically AL-6XN stainless steel and three nickel-based alloys, PE-16, Haynes 230, and Alloy 625. The tests were performed for exposure durations of up to 3000 h with samples being removed for analyses at 500 h intervals. The corrosion performance of the alloys was evaluated by weight change measurements, and the surface oxide layers were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Weight gain measurements showed that the Al-6XN stainless steel exhibited the least corrosion resistance while the weight gains were nearly similar for the other alloys. The oxide layer in AL-6XN stainless steel was composed of large equiaxed grained outer layer of Fe3O4 (magnetite) and an inner layer of FeCr2O4. Oxide spallation was observed in this stainless steel even after 500 h exposure. In all alloys, Cr-rich oxides phases of Cr2O3 and Cr1.4Fe0.7O3 were identified as the protective layers. In alloy PE-16 a thin layer of aluminum oxide formed that promoted the corrosion resistance of the alloy. Cr2O3 was identified as the main protective oxide layer in nickel base alloys Haynes 230 and 625. (C) 2012 Elsevier Ltd. All rights reserved.