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以700℃先进超超临界(A-USC)锅炉关键部件候选的4种镍基合金Inconel 740H、Nimonic 263、Alloy 617B、Haynes 282为研究对象,在模拟燃用国产高硫煤的750℃烟气/煤灰腐蚀环境中,对4种合金进行了2000h高温烟气腐蚀试验.结果表明:4种合金耐蚀性由高到低依次为Inconel 740H、Nimonic 263、Alloy 617B、Haynes 282.较高Cr、Al、Ti含量使得Inconel 740H具有最优耐蚀性.较高Mo含量使得Alloy 617B和Haynes 282腐蚀过程中生成大量挥发性腐蚀产物,导致这2种合金耐蚀性较差,而Haynes 282合金Cr含量相对较低,故其耐蚀性最差,并且讨论了相关腐蚀机理.“,”The fireside corrosion behaviours of four candidate nickel base alloys (including Inconel 740H, Nimonic 263, Alloy 617Band Haynes 282) for key components of 700℃ advance ultra-supercritical (A-USC) boilers exposed to the simulated flue/ash environments of a high sulfur domestic coal at 750℃ were investigated. The results show that the corrosion resistance of theselected nickel base alloys ranging from high to low can be concluded as: Inconel 740H, Nimonic 263, Alloy 617B, Haynes 282. The relatively higher Cr, Al, Ti contents may be responsible to the best corrosion resistance of Inconel 740H. The volatile corrosion products containing S and Mo resulted in poor corrosion resistance of Alloy 617B and Haynes 282. However the worst corrosion resistance of Haynes 282 was noticed due to the relatively low Cr content. Related fireside corrosion mechanism was discussed.