Influence of stainless steel Internals on Corrosion of tower wall materials

1st International Conference on Frontiers of Materials Synthesis and Processing

材料科学;化学

Chen, Bing^1 ; Ren, Ke^1

Department of Mechanical Engineering, Xian Shiyou University, Xian, China^1

关键词: 3.5% nacl solutions;    Cathode potential;    Cold-rolled plates;    Corrosion potentials;    Electrochemical behaviors;    ELectrochemical methods;    Polarization control;    Vacuum distillation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/274/1/012099/pdf
DOI  :  10.1088/1757-899X/274/1/012099

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In view of the galvanic corrosion of the tower wall material in the tower of a refinery atmospheric vacuum distillation unit, the electrochemical behavior of Q345R steel, stainless steel (201, 304 cold-rolled plate, 304 hot rolled plate and 316L) in 3.5%NaCl solution was studied by electrochemical method. The results show that the corrosion potential of Q345R is much lower than that of stainless steel, and the corrosion rate of Q345R is higher than that of stainless steel. As the anode is etched as the anode corrosion, the anode polarizability of stainless steel shows strong polarization ability, which is anodic polarization control, and Q345R is anode Active polarization control; Q345R/201 galvanic pair may be the most serious corrosion, and Q345R/316L galvanic couple may be relatively slight. Therefore, in the actual production of tower equipment, material design or tower to upgrade the replacement, it are recommended to use the preferred anode and cathode potential difference with the use of materials.