镀锌层重量对其生长规律的影响

采用场发射扫描电镜(SEM)、能谱分析仪(EDS)分析了不同镀锌层重量下镀锌层微观组织及相分布情况。结果表明,镀锌层重量为80、120 g/m²,镀锌层中的δ相呈栅栏状,ζ相从疏松状变为致密状;而镀锌层重量为275 g/m²时,镀锌层中的δ相呈致密状,ζ相呈疏松状。3种镀锌层重量下的δ相厚度占总厚度的比例最少,且各相厚度与镀锌层重量呈正比关系。当镀锌层重量较小时,锌层表面疏松多孔,有类似晶界的沟槽;随着镀锌层重量的增加,镀锌层表面变得致密平整,沟槽深度明显变浅变少。因此镀锌层重量影响其微观组织结构,进而影响锌铁合金的相结构。

Effect of zinc coating weight on its growth law

Microstructure and phase distribution of the galvanized layer under different zinc coating weight were analyzed by means of scanning electron microscopy (SEM) and energy spectrum analyzer (EDS). The results show that when the zinc coating weight is 80 and 120 g/m², the δ phase is fence-like, and the ζ phase changes from loose to dense, when the zinc coating weight is 275 g/m², the δ phase is dense and the ζ phase is loose. Among the three types of zinc coating weight, the thickness of the δ phase accounts for the least proportion of the total thickness, and the thickness of each phase is proportional to the zinc coating weight. When the zinc coating weight is less, the surface of galvanized layer is loose and porous, with grooves similar to grain boundaries. With the increase of the zinc coating weight, the surface of galvanized layer becomes dense and flat, and the depth of the grooves becomes significantly shallower and less. Therefore, the zinc coating weight affects its microstructure, which in turn affects the zinc-iron alloy phase structure.