Stray Current Corrosion of Aluminum Electrolysis System

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: Accelerated corrosion;    Aluminum electrolysis;    Aluminum smelting;    High-electrical resistivities;    Induce corrosion;    Steel in concretes;    Stray current corrosion;    Transmission rates;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/382/2/022001/pdf
DOI  :  10.1088/1757-899X/382/2/022001

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The aluminum smelting process requires large amounts of electricity, and the leakage of current from aluminum cells is through the earth forming stray current. Stray current induce corrosion on metallic pipeline and steel in concrete, leading to severe localized attack. Stray current corrosion in the metallic pipeline is totally similar to the classic; stray current rarely can corrosive consequences on steel in concrete, because steel in alkaline and chloride-free concrete is passive, and the high electrical resistivity of concrete. If the driving voltage is increased, the steel embedded in the concrete can be induced to corrode. Stray current corrosion of steel in concrete under single load can be divided into accelerated corrosion and steady development in 2 stages. Stray current can obviously increase the transmission rate of chloride ion into concrete and reduce the time of chloride ion penetrating the concrete to the surface of the steel bar.