在金属和合金材料的组织结构研究中,金相方法占有重要的地位。若想使照片醒目,深浅适宜,并彩色分明地表达出多层次组织,真实地反映出微观结构特征,金相制样和照相成为关键的两环。为去除道痕和金属紊乱层及真实地显示组织,现有抛光和浸蚀方法多达几十种,但对于钨一类易钝化材料都不完全适用。为了科研需要,在无资料借鉴条件下,我们进行了交流电解抛光和侵蚀的试验,结果获得出乎意外的成功。不仅去除了道痕和金属紊乱层,对变形流线、不同纹理及取向、单双向滑移、不同应力区变形作用图象、位错极点显示、螺旋生长台阶及晶界迁移等微细结构,可以得到令人满意的结果。这是直流等其它方法难以达到的,为易钝化金属材料组织显示创出了新路。 Metallographic methods play an important role in the study of the microstructures of metals and alloys. If you want to make the photos eye-catching, appropriate depth, and multi-level color-clear multi-level organization, a true reflection of the microstructure features, metallographic sample preparation and photography as the key to the two rings. There are dozens of methods available for polishing and etching to remove traces of marks and metallic disordered layers and to show the true texture of the tissue. However, they are not entirely suitable for passivated tungsten materials. In order to meet the needs of scientific research, we conducted experiments on the exchange of electrolytic polishing and erosion under the condition of no information for reference. The results were unexpectedly successful. Not only traces and metal dislocation layers are removed, but also fine structures such as deformation flow lines, different textures and orientations, single and two-way slippage, images of deformation in different stress regions, pole dislocation displays, spiral growth steps and grain boundary migration can be removed Get satisfactory results. This is difficult to achieve by other methods such as DC, which has created a new path for the passivation of metallic materials.