多种高温金属材料在超临界二氧化碳中的腐蚀行为  

Corrosion Behavior of Various High-temperature Materials in Supercritical Carbon Dioxide

作　　者：肖博 李开洋 王碧辉 朱忠亮 张乃强[1] XIAO Bo;LI Kaiyang;WANG Bihui;ZHU Zhongliang;ZHANG Naiqiang(School of Energy Power and Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2023年第11期4198-4206,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52071140);中央高校基本科研业务费专项资金项目(2022MS012)。

摘　　要：超临界二氧化碳布雷顿循环发电是一种新兴的发电技术,保证其中高温材料的抗腐蚀性能满足要求是设备安全运行的必要前提。该文研究3种耐高温材料P92、Sanicro25、Inconel625在600℃、25MPa超临界二氧化碳中的腐蚀行为。采用扫描电镜、能谱分析、X射线衍射、X射线光电子能谱、原子力显微镜以及辉光放电光谱仪对腐蚀产物进行表征。结果表明:P92形成了较为疏松、多孔洞的双层氧化膜结构;Sanicro25和Inconel625则形成致密的Cr_(2)O_(3)氧化膜。P92的氧化层有明显的孔洞形成,而氧化层下方基体发生渗碳;Sanicro25和Inconel625氧化层下方则有明显的贫Cr现象发生。Sanicro25和Inconel625抗腐蚀性能和抗渗碳能力明显优于P92。同时,基于“空洞诱导双层氧化膜形成机理”,指出合理的Cr元素含量是预防渗碳、保证氧化膜致密性的关键因素之一。结果可为超临界二氧化碳循环机组的选材和腐蚀防护提供一定参考和借鉴。Supercritical carbon dioxide Brayton cycle power generation is a new power generation technology.Moreover,ensuring the corrosion resistance of high-temperature materials is a prerequisite for the operation safety of the equipment.The corrosion behaviors of three alloys P92,Sanicro25,and Inconel625 in 25MPa supercritical carbon dioxide at 600℃ are investigated in this paper.The results are characterized by scanning electron microscope,energy spectrum analysis,X-ray diffraction,X-ray photoelectron spectroscopy,atomic force microscope,and glow-discharge optical emission spectrometry.The results show that P92 forms a loose and porous oxide scale,while Sanicro25 and Inconel625 form a dense Cr_(2)O_(3) oxide film.P92 has evident oxide pore formation and carburizing,while Sanicro25 and Inconel625 have Cr depletion.The corrosion resistance and carburizing resistance of Sanicro25 and Inconel625 are significantly better than those of P92.Based on the mechanism of void-induced duplex oxide formation,it is pointed out that the content of Cr is the key to preventing carburizing and ensuring the protective of the oxide scale.The results can provide some reference for material selection and corrosion protection of supercritical carbon dioxide cycle units.

关 键 词：超临界二氧化碳 腐蚀行为 铁素体耐热钢 奥氏体耐热钢 镍基合金 渗碳 

分 类 号：TG17[金属学及工艺—金属表面处理]