感应熔覆过程中氧化皮对锅炉管内壁力学性能的影响及其抑制技术研究  

Research on Influence of Oxide Scale on Mechanical Properties of Inner Wall of Boiler Tube and Its Suppression Technology in Process of Induction Cladding

作　　者：曲作鹏[1] 王磊 赵文博[3] 田欣利[4] 张贝贝 戴松元[1] 蔡墨朗 王海军 QU Zuopeng;WANG Lei;ZHAO Wenbo;TIAN Xinli;ZHANG Beibei;DAI Songyuan;CAI Molang;WANG Haijun(School of New Energy,North China Electric Power University,Beijing 102206,China;POWERCHINA Shanghai Electric Power Engineering Co.,Ltd.,Shanghai 200025,China;Central Research Institute of Building and Construction of MCC Group,Beijing 100088,China;Key Laboratory of National Defense Technology for Equipment Remanufacturing Technology,Army Academy of Armored Forces,Beijing 100072,China)

机构地区：[1]华北电力大学新能源学院,北京102206 [2]上海电力设计院有限公司,上海200025 [3]中冶建筑研究总院有限公司,北京100088 [4]陆军装甲兵学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《热加工工艺》2023年第16期90-93,98,共5页Hot Working Technology

基　　金：国家重点研发计划项目(2019YFC1907000);中央高校基本科研业务费项目(2020JG003)。

摘　　要：高频感应熔焊技术代表了锅炉四管受热面高温防腐技术的发展方向。但由于高频感应线圈对管外壁涂层加热重熔时,管内壁也随之被加热,使管内壁表面产生氧化皮。通过检测表面硬度和脱碳层深度等指标,对于氧化皮对管内壁性能的影响进行了评估。结果表明:当重熔温度升高使得管内壁温度超过580℃时,由管内壁基体表面起向外依次排列为FeO、Fe3O4、Fe2O3等三层氧化膜,厚度比约为1∶10∶100。FeO虽然较薄但结构疏松,晶格缺陷多,不稳定易分解,易从管内壁表面脱落,是造成爆管事故的主要因素。利用氮气保护的方法对感应重熔过程产生的氧化皮进行了有效抑制,该方法也抑制了管排背面氧化皮的产生,实验证明其效果显著。High-frequency induction cladding technology is one of the main directions for the development of high-temperature anti-corrosion technology for the four heating surfaces of boilers.However,when the high-frequency induction coil heats the coating on the outer wall of the tube,the inner wall of the tube is also heated,causing oxide scale on the surface of the inner wall of the tube.By testing the surface hardness and the depth of the decarburized layer,the influence of the oxide scale on the performance of the inner wall of the tube was evaluated.The results show that when the temperature of the inner wall of the tube exceeds 580℃,three oxide films of FeO,Fe_3O_4 and Fe_2O_3 are sequentially formed from the surface of the inner wall of the tube to the outside,with a thickness ratio of about 1∶10∶100.Although FeO is thin,it has a loose structure,a crystal lattice with many defects,and is unstable and easy to decompose,so it is easy to fall off from the inner wall surface of the tube,which is the main factor causing the tube burst accident.The method of nitrogen protection is used to effectively suppress the generation of oxide scale during the induction cladding process.This method also suppresses the generation of oxide scale on the back of the tube row,and the experiment proves that its effect is significant.

关 键 词：防护涂层 感应熔覆 氧化皮 爆管 抗氧化 

分 类 号：TG174.4[金属学及工艺—金属表面处理]