关键词: 镀锌层重量, 锌层组织, 相分布, 沟槽

Abstract: 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.

Key words: zinc coating weight, galvanized layer structure, phase distribution, grooves