50W800硅钢退火样在模拟海洋环境下腐蚀行为研究

采用金相显微镜、扫描电镜(SEM)和能谱(EDS)对无取向电工钢50W800退火试样组织、在模拟海洋环境下的腐蚀行为开展了微观及宏观形貌分析,结果表明,无取向电工钢50W800退火试样的金相组织为等轴晶铁素体组织,典型夹杂物类型有A1N、Al2O3、Al2O3-MnS、MgO-Al2O3-MnS夹杂;在模拟海洋环境下无取向电工钢50W800退火试样存在3种不同形貌的锈斑,且每种形貌锈斑在盐雾箱腐蚀60 min内变化过程存在差异,试样发生腐蚀的主要原因是由夹杂物Al2O3、Al2O3-MnS和Mg(-Al2O3-MnS引起的腐蚀形貌变化,且10μm以上Al2O3-MnS夹杂物引起的腐蚀,随着腐蚀时间的增加腐蚀面积增大.

Research on corrosion behavior of non-oriented electrical steel50W800 in simulated marine environment

The corrosion behavior of 50W800 non-oriented electrical annealed steel under neutral salt spray condition was studied, and the causes of corrosion were analyzed.Metallographic microscope, scanning electron microscope (SEM) and energy spectrum analysis (EDS) were used to analyze the microstructure of the annealed samples, and the macroscopic and microscopic corrosion morphology of the 50W800 annealed samples of non-oriented electrical steel were analyzed to determine the corrosion reasons of the annealed plates.The microstructure analysis results showed that the metallographic structure of the 50W800 annealed sample of the non oriented electrical steel is equiaxed crystal ferrite structure. The typical inclusions in the 50W800 annealed sample of the non oriented electrical steel include AlN inclusions, Al2O3 inclusions, Al2O3-MnS inclusions and MgO-Al2O3-MnS inclusions.The results of corrosion behavior process showed that there are three kinds of rust spots with different morphology in the corrosion process of 50W800 test plate of non-oriented electrical steel, and the change process of rust spots with different morphology is different within 60 minutes of salt spray box corrosion.According to the analysis of corrosion process and cause of 50W800 test sample of non-oriented electrical steel, the main reason for corrosion of sample is the change of corrosion morphology caused by inclusions Al2O3, Al2O3-MnS and MgO-Al2O3-MnS.Moreover, the corrosion area caused by Al2O3-Mns inclusions above 10μm increases with the increase of corrosion time.