Study on pickling mechanism and efficient pickling measures of 50W470 silicon steel
In response to the high difficulty of pickling silicon steel,the pickling efficiency is much lower than that of carbon steel,and the problem of local oxide scale residue and low whiteness value on the surface of the strip after pickling,the morphology of the oxide scale of 50W470 silicon steel was characterized using SEM,metallographic microscope,and other methods.The pick-ling behavior was studied using pickling experiments,and the cause,pickling process and electrochemical characteristics of the oxide scale were analyzed.The oxide scale of 50W470 silicon steel is mainly composed of outer layer hematite,inner layer FeO,SiO2,and both products Fe2SiO4,which are different from that of hot-rolled carbon steel.Its pickling power is chemical dissolution and H2 stripping,that is,the oxide difficult to pickle is dissolved and loosened by the matrix and bottom oxide scale,and then peeled off un-der the action of H2 expansion pressure.The pickling of scale of silicon steel mainly goes through two stages:first,the stripping of hem-atite on the surface,and then the dissolution and stripping of the lower oxide layer.The pickling efficiency of silicon steel can be improved by heating the strip to remove hematite and adding the solutions oxidizing ability to remove Fe2SiO4.
50W470 silicon steeloxide scalesdescaling mechanismstrip heating up to picklinghigh efficiency picklingsurface quality
万方数据
维普
