Co含量对Ni-Fe基高温合金在模拟燃煤锅炉烟灰/气环境中腐蚀行为的影响  

Effect of Cobalt Content on Corrosion Behavior of Ni-Fe Based Superalloys in Simulated Coal Ash/Gas Environment

作　　者：黄锦阳[1] 鲁金涛[1] 李琰[1,2] 杨珍[1] 周永莉[1] 谷月峰[1] 

机构地区：[1]西安热工研究院有限公司国家能源清洁高效火力发电技术研发中心,西安710032 [2]西安科技大学材料科学与工程学院,西安710054

出　　处：《腐蚀科学与防护技术》2017年第4期369-374,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金(51301130和51401163);华能集团科技项目(HNKJ15-H02和HNKJ15-H04)~~

摘　　要：设计4种不同Co含量6%~20%(质量分数)的Ni-Fe基模型高温合金,在模拟锅炉煤粉燃烧烟灰/气环境中研究了模型合金750℃的腐蚀行为。结果表明,500 h腐蚀后,Co含量对合金的腐蚀动力学影响较小,但最高Co含量合金具有最低的腐蚀速率。合金腐蚀产物层结构连续完整,主要为富Cr氧化物,另有少量NiCr_2O_4、硫化物以及富Al的内氧化腐蚀产物。但是,随着Co含量升高,合金的氧化膜厚度减小,内氧化程度减弱。Four Ni-Fe based model superalloys with different Co content（6%~20%, mass fraction）were prepared. Then their corrosion behavior was investigated in a simulated coal ash/gas environment at 750 ℃. The results showed that Co content had less effect on the corrosion kinetics of the model alloys, but the corrosion rate of the model alloy with the highest Co content was the lowest. A dense oxide scale without cracks was observed, while Cr-rich oxide was the main corrosion product for all of samples.However, a small amount of NiCr_2O_3, sulfide and Al-rich internal oxide are discovered. The oxide scale thickness and the internal oxidation degree of Ni-Fe based model superalloys, are reduced with the increase of Co content.

关 键 词：CO含量 Ni-Fe基合金 腐蚀 煤灰 烟气 

分 类 号：TG172[金属学及工艺—金属表面处理]