白云鄂博矿含氟烧结料对高铬铸铁篦条失效行为的影响

• 作 者: 高雪云 刘俊友 刘杰 田景玉
• 机 构: 北京科技大学材料科学与工程学院,北京北科德瑞冶金工程技术有限公司,
• 出 处: 腐蚀科学与防护技术
• 发表日期: 2011年03期
• 关键词: 烧结料 高铬铸铁 白云鄂博矿 失效行为 氟含量 表面氧化 烧结台车 物相分析 烧结矿 烧结车间

利用扫描电镜(SEM)观察白云鄂博矿烧结用失效高铬铸铁篦条的表面氧化膜形貌,进行成分能谱分析(EDS),测定氧化膜中氟含量,结合X射线衍射(XRD)对氧化膜进行物相分析,分析含氟烧结料用高铬铸铁篦条的失效机理.结果表明,在高温运行中,烧结料的F、S、Na、K等使篦条基材产生腐蚀,篦条腐蚀膜中结构疏松的Na_2SO_4、K_2SO_4、FeF_3和低熔点Ni·NiS共晶使其表面不能形成致密连续的腐蚀膜,从而造成失效.

Scanning electron microscopy (SEM) was used to observe the morphology of the oxide film on the surface of the high chromium cast iron grate in the Bayan Obo deposit by energy dispersive X-ray diffraction (EDS). The content of fluorine in the oxide film was measured. Film was used to analyze the failure mechanism of high chrome cast iron grate bars containing fluorine-containing sintering materials. The results show that, at high temperature, F, S, Na, K, The loosely structured Na_2SO_4, K_2SO_4, FeF_3 and low-melting Ni · NiS eutectic in the corrosion film can not form a dense and continuous corrosion film on the surface, resulting in failure.