用光学显徽镜、电子探针、Ｘ射线衍射仪和透时电镜研究了Ｔ１２钢电极中性盐浴渗钛层的组织结构。试验结果表明：渗层包括内外两白亮层，两层之间有比较明显的分界；内白亮层与基体之间存在黑色的过渡层。外白亮层是ＴｉＣ层，其中含有少ａ－Ｆｅ；内白亮层是ａ－Ｆｅ层；内外层交界为ａ－Ｆｅ基体上分布ＴｉＣ。铁素体内层是在碳化钛层形成过程中使其前沿附近含碳量降低，同时溶入缩小γ区的元素钛而逐渐形成的。 The microstructure of neutral salt bath titania layer on T12 steel was studied by using optical microscope, electron probe, X-ray diffraction and transmission electron microscopy. The experimental results show that the infiltration layer includes two white bright layers inside and outside, and there is a clear boundary between the two layers. There is a black transition layer between the bright white layer and the substrate. The outer white layer is TiC layer, which contains less a-Fe; white bright layer is a-Fe layer; inner and outer boundaries of a-Fe matrix distribution of TiC. The ferrite inner layer is gradually formed by reducing the amount of carbon in the vicinity of its front edge during the formation of the titanium carbide layer while dissolving into the titanium element of the reduced γ region.