Ce含量对434铁素体不锈钢微观组织和腐蚀行为的影响

The effect of Ce content on the microstructure and corrosion behavior of 434 ferritic stainless steel

通过电化学测试以及微观结构表征的方法,系统研究了不同含Ce量对SUS434铁素体不锈钢合金组织、钝化膜和腐蚀行为的影响。研究结果表明,随着Ce含量的增加,SUS434铁素体不锈钢的晶粒尺寸显著细化,且能够通过改善钝化膜层的保护性以此提高其耐蚀性。当434铁素体不锈钢含有较高的Ce含量时,样品的敏化程度相对较低,浸泡后的样品表现出优异的耐晶间腐蚀性。这主要因为当Ce含量较低时晶粒尺寸大,一般而言,晶粒度越大意味着不锈钢的晶界面积越大,这在一定程度上增加了腐蚀电池形成的可能性。另外,大晶粒通常包含更多的夹杂物和析出物,这些杂志也会加速腐蚀过程。

The effects of different Ce contents on the microstructure,passivation film,and corrosion behavior of SUS434 ferritic stainless steel alloy were systematically studied through electrochemical testing and microstructure characterization.The research results indicate that with the increase of Ce content,the grain size of SUS434 ferritic stainless steel is significantly refined,and its corrosion resistance can be improved by improving the protection of the passivation film layer.When 434 ferritic stainless steel contains high Ce content,the sensitization degree of the sample is relatively low,and the soaked sample exhibits excellent resistance to intergranular corrosion.This is mainly because when the Ce content is low,the grain size is larger.Generally speaking,the larger the grain size,the larger the grain boundary area of stainless steel,which to some extent increases the possibility of corrosion battery formation.In addition,large grains typically contain more inclusions and precipitates,which can also accelerate the corrosion process.