• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials and Corrosion >The influence of alloying elements on the chlorine-induced high temperature corrosion of Fe-Cr alloys in oxidizing atmospheres
【24h】

The influence of alloying elements on the chlorine-induced high temperature corrosion of Fe-Cr alloys in oxidizing atmospheres

机译：合金元素对氧化气氛中氯对Fe-Cr合金高温腐蚀的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effect of the alloying elements Al, Cr, Mn, Mo, Si and Ti on the corrosion behaviour of ferritic Fe-15Cr model alloys was studied in a N{sub}2/He-5 vol.% O{sub}2 gas mixture with and without additions of 500- 1500 vppm HCL at 600℃. The main corrosion mechanism is "active oxidation", characterized by the formation of volatile metal chlorides at the metal/oxide interface. Volatilization and subsequent conversion of the chlorides into oxides results in the formation of porous and poorly adherent oxide scales. Large mass gains were observed for Fe-15Cr, Fe-35Cr and Fe-15Cr with additions of 5 wt.% Ti, 10 wt.% Mn or 10 wt.% Mo. The specific morphology of the corrosion products depends strongly on the alloying elements. For the Fe-Cr alloys, a model for the formation of the scales, which are characterized by alternating dense and porous layers, is presented. The addition of 5 wt.% Si or Al to Fe-l5Cr leads to much better corrosion resistance by the formation of protective Cr{sub}2O{sub}3/Al{sub}2O{sub}3-layers, however in the case of Al addition the behaviour depends strongly on the experimental conditions, as surface treatment and flow velocity. In Fe- 15Cr- 10Mo preferential removal of the more reactive metals Fe and Cr was observed resulting in a Mo-enriched porous metal zone underneath the metal-oxide interface. The effect of carbon on the corrosion behaviour was examined by addition of 0.3-0.8 wt.% C to the model alloys. Cr-rich M{sub}23C{sub}6-carbides were attacked preferentially while Mo-rich M{sub}6C-carbides are very stable relative to the matrix and the attack occurs in regions surrounding the carbides.
机译：研究了合金元素Al，Cr，Mn，Mo，Si和Ti在N {sub} 2 / He-5体积％O {sub} 2气体中对铁素体Fe-15Cr模型合金腐蚀行为的影响。在600℃下添加和不添加500- 1500 vppm HCl的混合物。主要的腐蚀机理是“活性氧化”，其特征在于在金属/氧化物界面处形成了挥发性金属氯化物。氯化物的挥发和随后的转化为氧化物导致形成多孔且粘附性较差的氧化皮。观察到Fe-15Cr，Fe-35Cr和Fe-15Cr的质量增加较大，其中添加了5 wt。％的Ti，10 wt。％的Mn或10 wt。％的Mo。腐蚀产物的特定形态在很大程度上取决于合金元素。对于Fe-Cr合金，提出了一种鳞片形成的模型，该模型的特征是交替的致密层和多孔层。通过在保护层中形成Cr {sub} 2O {sub} 3 / Al {sub} 2O {sub} 3保护层，可以在Fe-15Cr中添加5 wt％的Si或Al，从而获得更好的耐腐蚀性。在添加铝的情况下，其行为在很大程度上取决于实验条件，如表面处理和流速。在Fe-15Cr-10Mo中，观察到优先去除了更具反应性的金属Fe和Cr，从而在金属-氧化物界面下方形成了富Mo的多孔金属区域。通过向模型合金中添加0.3-0.8 wt。％的C，检查了碳对腐蚀行为的影响。富铬的M {sub} 23C {sub} 6-碳化物优先受到侵蚀，而富钼的M {sub} 6C碳化物相对于基体非常稳定，并且侵蚀发生在碳化物周围的区域。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号