Preparation of superamphiphobic stainless steel surface by laser and perfluorooctanoic acid treatment

• A superhydrophobic and oleophobic 304 stainless steel surface was prepared by laser etching and low surface energy of PFOA aqueous solution treatment. • The superamphiphobic 304 stainless steel sample possessed self-cleaning ability and outstanding stability. • Under certain wear, the treated 304 stainless steel surface still retains good superamphiphobic. A kind of stainless steel surface with superhydrophobic and superoleophobic were prepared by nanosecond laser. The surface of 304stainless steel was ablated by laser to obtain micro-nano structure, and then the surface energy of the sample was reduced by using the aqueous solution of perfluorooctanoic acid (PFOA) to obtain the special wettability surface. The contact angles (CA) of 5 μL of water, glycerol, peanut oil and hexadecane were 165.77°, 155.09°, 155.24° and 152.83° respectively, and the sliding angles (SA) were about 1°, 2°, 4° and 10° respectively. The surface of the sample was analyzed and characterized by SEM, EDS, FTIR and other testing equipment. The influence of single variable on wettability was studied by controlling the scanning interval, speed, heating temperature, soaking time and so on. The samples obtained by this method have good self-cleaning, wear resistance and stability, and can still maintain good superhydrophobic and superhydrophobic properties under natural conditions for up to two months.