摘要
采用超音频感应熔覆技术,在HT300基体表面制备铁基熔覆层。通过SEM、EDS及XRD研究了熔覆层的显微组织以及物相组成,并对熔覆层和基体进行电化学腐蚀实验及浸泡腐蚀实验。结果表明:熔覆层的组织致密,存在少量细小气孔,与基体形成冶金结合;熔覆层主要由α-(Fe,Cr)、Fe3C和(Cr,Fe)7C3等相组成;该熔覆层的耐电化学腐蚀性好,腐蚀速率约为基体的1/3;在60%H2SO4溶液中,铁基熔覆层的腐蚀速率随腐蚀时间的延长而急剧降低,最后达到0.87μm/a。
Fe-based cladding coating was fabricated on HT300 substrate by ultrasonic frequency induction cladding technique.The microstructure and phase composition of the cladding coating were researched by SEM,EDS and XRD.The electrochemical corrosion test and immersion corrosion test were conducted to the coating and substrate.The results show that the microstructure of the coating is uniform and dense,with several small pores.The coating is metallurgically bonding to the substrate.The phase composition of the coating includesα-(Fe,Cr),Fe3C and(Cr,Fe)7C3 phases.The electrochemical corrosion resistance of the coating is better,which is one third than that of the substrate.The corrosion rate of Fe based coating in 60%H2SO4 solution decreases sharply with the corrosion time increasing,finally reaching at 0.87μm/a.
作者
宋博
于静
朱新河
SONG Bo;YU Jing;ZHU Xinhe(Marine Engineering College,Dalian Maritime University,Dalian 116026,China)
出处
《热加工工艺》
北大核心
2019年第18期81-84,89,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(51605066)
辽宁省科学技术计划项目资助(201601581)
中央高校基本科研业务费项目资助(3132017014)
关键词
超音频感应熔覆
铁基熔覆层
耐腐蚀性
ultrasonic frequency induction cladding
Fe-based cladding coating
corrosion resistance
