Metallographic phase corrosive liquid for austenitic stainless steel as well as preparation and corrosion methods thereof

The invention provides a novel metallographic phase corrosive liquid for high temperature resistance and fatigue resistance 304 austenitic stainless steel. The metallographic phase corrosive liquid ischaracterized by being prepared from the following raw materials in percentage by mass: 7-9 percent of hydrofluoric acid, 12-16 percent of concentrated nitric acid, 1-2 percent of boracic acid and the balance of distilled water, wherein the mass concentration of the hydrofluoric acid is 40 percent, the mass concentration of the nitric acid is 60-65 percent, and the mass concentration of the boracic acid is 1-3 percent. The corrosive liquid is simple in preparation, convenient in operation of corrosion method, small in pollution and good in stability and reproducibility and can rapidly, uniformly and clearly display a metallographic structure; and a corrosion method is simple in step, convenient to operate and strong in practicability. 本发明提供种新型耐高温抗疲劳304奥氏体不锈钢用金相腐蚀液，其特征在于，由如下体积份数的原料组成，氢氟酸7％～9％，浓硝酸12％～16％、硼酸1～2％，余为蒸