摘要
为了提高铝电解阳极钢爪表面的防护性能,本文采用固体包埋渗铝的方法在Q235B材料表面制备Fe-Al合金层。通过扫描电子显微镜、氧化试验、磨粒磨损等试验,分别对渗铝层的微观结构、高温抗氧化性能、显微硬度、耐磨性能、力学性能进行分析。结果表明,在850℃×4 h的条件下对Q235B进行固体包埋渗铝,其渗铝层的最大深度可达500μm,铝元素由外向内形成明显的浓度梯度。渗铝层最大硬度可达750 HV,耐磨性是Q235B材料17倍以上,可显著提高材料的表面硬度和耐磨性;在高温下,该膜层可原位生成层致密均匀的氧化铝膜层,将Q235B材料抗氧化性能提高95倍以上,有效减少电解过程中高温对阳极钢爪产生的氧化腐蚀。同时,Q235B材料渗铝后,其抗拉强度和屈服强度基本保持不变,可满足钢爪正常使用的力学性能要求。
In order to improve the protective performance of the surface of anode stub for aluminum electrolysis,Fe-Al alloy layer is prepared on the surface of Q235B by solid embedding aluminizing method.The microstructure,high-temperature oxidation resistance,microhardness,wear resistance and mechanical properties of aluminized layer were analyzed by scanning electron microscope,oxidation test and abrasive wear test.The results show that when Q235B is aluminized at 850℃×4 h,the maximum depth of aluminized layer can reach 500μm,and aluminum element concentration gradient is obvious from the outside to the inside.The maximum hardness of aluminized layer can reach 750 HV,and the wear resistance is more than 17 times that of Q235B material,which can significantly improve the surface hardness and wear resistance of the material;Under high temperature,the film can generate a dense and uniform alumina film layer in situ,which can improve the oxidation resistance of Q235B material by more than 95 times,and effectively reduce the oxidation corrosion of anode stubs caused by high temperature in the electrolysis process.At the same time,the tensile strength and yield strength of Q235B material remain unchanged after aluminizing,which can meet the requirements for mechanical properties of anode stubs in normal use.
作者
李冬生
侯光辉
张旭贵
王开爱
刘丹
王慧瑶
梁贵生
Li Dongsheng;Hou Guanghui;Zhang Xugui;Wang Kaiai;Liu Dan;Wang Huiyao;Liang Guisheng(Zhengzhou Non-ferrous Metals Research Institute Co.,Ltd.of CHALCO,Zhengzhou 450041,China)
出处
《轻金属》
北大核心
2022年第10期20-23,51,共5页
Light Metals
基金
中铝郑州有色金属研究院有限公司自主研发项目(ZYY-2021-KJ-08)。
关键词
阳极钢爪
Q235B
渗铝
高温氧化
anode stub
Q235B
aluminizing
high temperature oxidation
