The invention discloses a metallographic
sample preparation and display method of an iron-aluminum-
silicon layer after
hot stamping forming of an aluminum-
silicon coated steel plate, which comprises the following steps: (1)
sample preparation: taking the aluminum-
silicon coated steel plate, blade-
coating a layer of finish paint on the surface of the steel plate by using an RDS20-50# scraper bar, placing the steel plate in a box-type
drying furnace for
drying, preserving heat, cooling with water, and then blow-
drying with
cold air, wherein the thickness of the film is 20-50[mu]m,
cutting the sample by using
wire cutting, and putting the sample into an embedding
machine for embedding; then performing
grinding and
polishing; (2)
chemical corrosion: the sample prepared in the step (1) is sequentially subjected to
chemical corrosion in a
test solution a and a
test solution b, the
test solution a is a 0.1%
nitric acid methanol solution, and the test solution b is 0.1%
nitric acid +0.1% HF
aqueous solution; and (3)
microscope observation: after
chemical corrosion is completed, washing the sample with absolute ethyl
alcohol, blow-drying the sample with a blower, and observing the sample under a ZISS metallographic
microscope. According to the method provided by the invention, a complete
coating structure can be obtained, the morphology and distribution state of each phase in the
coating can be clearly displayed in the structure observation process, and the method has the characteristics of low detection and analysis cost, rapidness and simplicity.