Method for displaying and observing snowflake-shaped binary eutectic phase three-dimensional morphology in zinc-aluminum-magnesium coating

The invention relates to a method for displaying and observing the three-dimensional morphology of a snowflake-shaped binary eutectic phase in a zinc-aluminum-magnesium coating, which comprises the following steps of: S1, taking a zinc-aluminum-magnesium coating steel plate, cutting a sample by wire cutting, cleaning the surface of the sample, covering the coating surface of the sample by heat-resistant oil paper, horizontally putting the surface of the coating of the sample into an inlaying machine for inlaying, tearing off the surface oil paper after inlaying, so that the surface of the sample coating is completely exposed; s2, water and a metallographic polishing agent are sequentially and evenly sprayed to the polishing cloth, and then the inlaid sample is subjected to polishing treatment; and S3, corroding the sample with a hydrofluoric acid aqueous solution, and then corroding the sample in a nitric acid alcohol solution. S4, after chemical corrosion is completed, the sample is washed clean with absolut