Gas Hot Corrosion Behaviors of 9Cr18 Alloy
摘 要
利用燃气热腐蚀试验、扫描电镜观察等手段, 研究了9Cr18合金在高温燃气中的热腐蚀行为。结果表明:该合金燃气热腐蚀产物可分为内、外两层, 且内、外两层之间存在较大的裂纹; 外层腐蚀产物含有较多铬的氧化物, 层内存在较多的横向裂纹; 内层腐蚀产物铬的氧化物含量较低, 且疏松多孔; 合金表面和晶界发现有硫化物, 合金存在明显的晶间腐蚀倾向; 腐蚀初期腐蚀增重和腐蚀速率较快, 随着时间的延长腐蚀增重和腐蚀速率趋于平缓。
Abstract
The gas hot corrosion behaviors of 9Cr18 alloy in high-temperature gas were studied by hot gas corrosion test and SEM observing. The results show that the gas hot corrosion products of the alloy could be divided into two layers, and there were large cracks between the two layers. The outside layer contained more chromium oxide and transversal cracks, and the internal layer contained less chromium oxide and was loose and porous. Sulfur compounds were found on the alloy surface and grain boundaries, and the alloy had an obvious tendency to intergranular corrosion. The corrosion mass gain per unit surface area and corrosion rate were rather fast in the early stage, and then tended to be slow and steady.
中图分类号 TG172.3 DOI 10.11973/lhjy-wl201602005
所属栏目 试验与研究
基金项目
收稿日期 2015/2/9
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备注霍世军(1978-),男,高级工程师,硕士。
引用该论文: HUO Shi-jun,SUN Bo,SU Jing. Gas Hot Corrosion Behaviors of 9Cr18 Alloy[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2016, 52(2): 95~98
霍世军,孙博,苏敬. 9Cr18合金的燃气热腐蚀行为[J]. 理化检验-物理分册, 2016, 52(2): 95~98
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【3】刘晓宁, 黄春波, 沈忠良,等.940X新型不锈钢的耐腐性能[J].腐蚀与防护, 2008,29(9):523-525.
【4】袁超, 郭建亭,李宁, 等.GH2328合金的耐蚀性与耐磨性[J].钢铁研究学报, 2011(12):60-63.
【5】王俊.波纹管开裂原因分析[J].理化检验-物理分册, 2013,49(9):632-636.
【6】燕样样, 姚永红.钢材相似显微组织的分析与鉴别[J].理化检验-物理分册, 2013,49(2):79-90.
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【11】黄乾尧, 李汉康.高温合金[M].北京:冶金工业出版社, 2000.
【12】GREENE G A, FINFROCK C C. Oxidation of Inconel 718 in air at high temperatures[J]. Oxidation of Metals, 2001, 56(5): 505-521.
【13】李铁藩.金属高温氧化和热腐蚀[M].北京:化学工业出版社, 2003.
【14】KAI W, LEE C H, LEE T W, et al. Sulfidation behavior of Inconel 738 superalloy at 500-900 ℃[J].Oxidation of Metals, 2001,56(1/2):51-71.
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