本发明公开了一种双相不锈钢的侵蚀剂以及侵蚀方法，属于双相不锈钢的显微组织的测定方法，解决了现有技术中侵蚀剂侵蚀双相不锈两相的颜色上对比度不高、不易区分、配制复杂、 溶液易挥发的问题。该侵蚀剂包括高锰酸钾、硫酸和水，高锰酸钾、硫酸和水的质量比为1～3：16 ～20：90。侵蚀方法为配制侵蚀剂，制作双相不锈钢的金相试样；将金相试样浸泡在侵蚀剂中；从侵蚀剂中取出金相试样，得到侵蚀后的金相试样。上述侵蚀剂以及侵蚀方法可用于侵蚀双相不锈钢。

The invention discloses an etchant for duplex stainless steel and an erosion method, belonging to a method for measuring the microstructure of duplex stainless steel, and solves the problem that the corrosion agent in the prior art erodes the two-phase stainless steel with low contrast in color. Problems that are difficult to distinguish, complicated to prepare, and volatile solutions. The etching agent includes potassium permanganate, sulfuric acid and water, and the mass ratio of potassium permanganate, sulfuric acid and water is 1 to 3:16 to 20:90. The etching method is to prepare an etchant to prepare a metallographic sample of duplex stainless steel; immerse the metallographic sample in the etchant; remove the metallographic sample from the etchant to obtain the eroded metallographic sample. The above-mentioned etching agents and etching methods can be used to attack duplex stainless steels.