中文摘要：

为了研究先进超超临界候选合金在燃用我国典型煤种的烟气/煤灰条件下的腐蚀行为和机理,本文以700℃先进超超临界机组锅炉关键部件候选材料镍基合金Haynes 282为研究对象,在模拟燃用国产高硫煤的650、700、750℃烟气/煤灰腐蚀环境中进行烟气腐蚀试验,通过腐蚀动力学曲线、X射线衍射、扫描电镜、X射线能谱研究了其高温烟气腐蚀行为及腐蚀产物生成机理。结果表明：在650℃时腐蚀速率最低,机理以高温氧化为主,腐蚀产物主要为Cr2O3;700、750℃时,合金均发生一定程度第二类硫酸盐型热腐蚀,腐蚀产物均呈内外双层结构,外层富O、Ni、Co,内层富O、Cr、S、Mo;700℃时腐蚀速率最快,低熔点共晶盐挥发程度加剧导致了750℃时腐蚀速率略有下降,650℃时腐蚀速率最低。

英文摘要：

To investigate the corrosion behavior and mechanism of candidate alloy for advanced ultra supercritical units firing typical coals in China, the Haynes 282, a candidate nickel-base alloy for key components of 700 ℃ advanced ultra-supercritical （A-USC） boilers, was taken as the research object to carry out flue gas corrosion test in simulated flue gas/ash environments firing domestic high sulfur content coal at 650 ℃, 700 ℃ and 750 ℃. Through the corrosion kinetic curves, X-ray diffraction （XRD）, scanning electron microscope （SEM） and X-ray energy spectrum （EDS）, the corrosion behaviour and products formation mechanism of the Haynes 282 were investigated. The results indicat that, the corrosion rate was the lowest at 650 ℃, high temperature oxidation mainly occurred at this temperature and the major corrosion product was Cr203. Type- II sulfate hot corrosion occurred at 700 ℃ and 750 ℃. The corrosion product＇s double-corrosion-layer structure was observed, with O, Ni, Co rich in the outer layer and O, Cr, S, Mo rich in the inner layer. The corrosion rate was the highest at 700 ℃ .The corrosion rate at 750 ℃ was lower due to the intensing volatilization of eutectic salts withlow melting point.