摘要
Si的加入改变了Fe-2.5B合金的微观组织,进而影响到这种合金在锌液中的耐腐蚀性能。当Si含量为2-8%wt时,Fe-2.5B-XSi是亚共晶组织,Si分布在-αFe和Fe2B相中。配制一系列由单相-αFe组成的合金,其Si含量与Fe-2.5B-XSi合金中的-αFe相中的Si含量相同,在液锌中测试这两组试样的腐蚀速率,据此可以推断出Fe2B相的腐蚀速率。结果表明,随Si含量的增加,-αFe相的腐蚀速率下降,其原因是随Si含量的增加,-αFe与锌液反应生成的块状FeSi相增多,该相对锌的扩散起阻挡作用。随Si含量增加,Fe2B相的腐蚀速率上升,原因是随Si含量的增加,Fe2B相的点阵参数、晶胞体积增加,即硅削弱Fe2B中键的结合强度,降低了Fe2B的稳定性。两相的相互作用使Fe-2.5B合金随Si含量的增加,耐腐蚀性能增强。
Si can change the microstructure of Fe-2 .5B alloy and furthermore affect the corrosion resistance of the alloy in molten zinc. The alloys are hypoeutectic in the range of 2-8% Si, which distributed in both α-Fe and Fe2 B phases. A series of single α-Fe phase alloys was made with the same Si content as that in α-Fe phase of the alloys Fe-2.5B-xSi. The corrosion rate of the Fe2 B phase can be deduced by comparing with the corrosion rate of two group alloys. The result shows that the corrosion rate of the phase α-Fe decreased with increasing Si, the reason is that a new phase FeSi was formed, which holds back the diffusion of zinc atoms. The corrosion rate of the phase Fe2 B increased with increasing Si. The reason is that Si weakened the bonds of Fe2 B phase because the volume of crystal lattice increases and its stability reduces owing to Si atoms entering the crystal lattice of the Fe2 B phase. Anyway overall corrosion resistance of Fe-2.5B alloy increased with the increasing Si owing to interaction between two phases.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2006年第4期592-596,共5页
Journal of Materials Science and Engineering
基金
河北省自然基金资助项目(503630)
关键词
微观结构
共晶
锌液腐蚀
Fe2B
microstructure
eutectic
corrosion in molten zinc
Fe2B
