Inconel 740H合金在模拟煤灰/烟气中的抗腐蚀性研究  

Corrosion Resistance of Inconel 740H in Simulated Coal-ash/Flue-gas Environments

作　　者：侯世香[1] 吴正发 袁晓娜[1] 刘东雨[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《腐蚀科学与防护技术》2016年第3期247-252,共6页Corrosion Science and Protection Technology

基　　金：中国华能集团公司科学技术项目(HNKJ12-H02)资助

摘　　要：针对用于超超临界锅炉过热器管的镍基高温合金Inconel 740H,在750℃及合成烟气的条件下,研究了涂刷合成煤灰试样和无涂刷试样累计3000 h的腐蚀情况。利用XRD、EDS和SEM对试样的表面和截面进行了分析。结果表明,涂刷合成煤灰试样的腐蚀分为两个阶段,开始在表面生成Cr_2O_3保护膜,随时间的延长氧化膜被硫酸盐溶解,腐蚀程度较重。无涂刷试样的腐蚀为一个阶段,即氧化和硫化腐蚀。The corrosion behavior of Ni-based superalloy Inconel 740, as superheater tubing, was studied in environments of synthetic coal-ash/flue-gas and synthetic flue-gas at 750 ℃ for 3000 h comparatively. The corrosion product, the surface morphology and the cross-sectional morphology of the corroded alloy were characterized by means of SEM, EDX and XRD, respectively. The results indicate that the corrosion process of the alloy exposed to the synthetic coal-ash/flue-gas can be divided into two stages. During the initial stage, the Cr2O3 film formed and then the degradation of corrosion resistance of the alloy can be attributed to the dissolution of protective Cr2O3 film in sulphate. The corrosion mechanism of the alloy in the synthetic flue-gas without coal-ash is oxidation and sulfidation during the exposure.

关 键 词：镍基高温合金 INCONEL 740H 煤灰/烟气腐蚀 高温腐蚀 

分 类 号：TG174.3[金属学及工艺—金属表面处理]