High Temperature Corrosion of Prebaked Anode Steel-structure for Aluminium Reduction

2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation

材料科学;机械制造;运输工程

Cao, A-Lin^1 ; Guo, Lin^1 ; Li, Jing-Jing^1

Chemical Engineering and Food Institute, Zhengzhou Institute of Technology, Zhengzhou, Henan

450044, China^1

关键词: Aluminium electrolysis cells;    Aluminium ingots;    Anticorrosion mechanism;    Corrosion layers;    Corrosion mechanisms;    Electrolysis cell;    Industrial production;    Intermediate product;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/382/2/022033/pdf
DOI  :  10.1088/1757-899X/382/2/022033

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The industrial production of primary aluminium in Hall-Héroult electrolysis cells, where alumina (Al2O3) is dissolved in a molten fluoride-containing electrolyte consisting mainly of cryolite (Na3AlF6) at about 960°C. In a modern aluminium electrolysis cell several prebaked carbon anodes are dipped into the electrolyte, and oxide ions from the dissolution of alumina are discharged electrolytically onto the anodes as an intermediate product. Anode steel-structure is an important part of prebaked carbon anode type cells, which is an assembly unit for connection of carbon anode and aluminium guide rod. Anode steel-structure is always used in a bad environment of high acid and high temperature for a long time. Therefore, the anode steel-structure can just be used in a limited time because of the corrosion of acid. Furthermore, liquid aluminium can be polluted by corrosion layer, which results in the decrease of the quality of aluminium ingots. Thus, it is very important to find out the corrosion mechanism of the anode steel-structure, So this paper will investigate the anticorrosion mechanism of high-temperature corrosion of prebaked anode steel-structure for aluminium reduction.