Effect of Sulfur and Chlorine on Fireside Corrosion Behavior of Inconel 740 H Superalloy

被引：9
作者：
Lu Jin-tao [1 ]
Li Yan [1 ,2 ]
Yang Zhen [1 ]
Huang Jin-yang [1 ]
Zhu Ming [2 ]
Gu, Y. [1 ]
机构：
[1] Xian Thermal Power Res Inst Co Ltd, Natl Energy R&D Ctr Clean & High Efficiency Fossi, Xian 710032, Shaanxi, Peoples R China
[2] Xian Univ Sci & Technol, Coll Mat Sci & Engn, Xian 710054, Shaanxi, Peoples R China
来源：
HIGH TEMPERATURE MATERIALS AND PROCESSES | 2018年 / 37卷 / 03期
基金：
中国国家自然科学基金;
关键词：
boiler; coal-ash/flue-gas; corrosion; Inconel; 740H; NICKEL-BASE SUPERALLOYS; OXY-FUEL COMBUSTION; HOT CORROSION; POWER-PLANTS; COAL ASH; ALLOYS; ENVIRONMENTS; TEMPERATURE; RESISTANCE; STABILITY;
D O I：
10.1515/htmp-2016-0186
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fireside corrosion behavior of Inconel 740H superalloy was studied at 750 degrees C in simulated coal ash/flue gas environments by means of XRD, SEM and EDS. The results indicated that the corrosion behavior was strongly related to the SO2 levels and was significantly affected by NaCl additions. In presence of the atmospheres with 0.1% SO2, the alloy exhibited the highest corrosion resistance due to formation of a stable and dense Cr2O3 film. In presence of the atmosphere with 1.5% SO2, however, a non-coherent and porous Cr2O3 film was formed. The thickness of film and internal sulfides were substantially increased. The NaCl additions significantly accelerated the corrosion process. A non-protective outer oxide film was formed, composed by multiple layers with serious inner sulfide and spallation. The depths of internal oxidizing and sulfuration zones were significantly increased. The mechanism of ash corrosion formation was also discussed.
引用
收藏
页码：245 / 251
页数：7
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