Method for preparing ordered micropore structure on stainless steel surface

Abstract

The invention relates to a method for preparing an ordered micropore structure on a stainless steel surface, and belongs to the technical field of preparation of surface micro-structures. The method is an electrochemical etching method and comprises the following steps: placing stainless steel which is subjected to degreasing, electrochemical polishing and nitric acid passivation into a water base solution in which the concentration of phosphoric acid is 15 to 50g / L, and corroding for 30 to 120min under a process condition in which the current density is 5 to 50A / dm<2> and the temperature is 0 to 5 DEG C by a constant current method to obtain the ordered micropore structure which has a uniform pore diameter of 200 to 550nm and a pore depth of 1 to 3 microns. The micropore structure is generated in situ on the stainless steel surface, can avoid peeling problem and is smooth on surface; and the stainless steel can still keep the original glaring appearance; moreover, the micropore structure is prepared from amorphous Cr2O3 and Fe2O3 so as to have a better wear and corrosion resistance than the existing stainless steel material; and the electrochemical corrosion and the electrochemical polishing can be both carried out in an ordinary electrolytic bath, so that the device is simple, and the preparation cost is low, and the method is easy to popularize.

Description

technical field [0001] The invention relates to a method for preparing a microporous structure, in particular to a method for preparing an ordered microporous structure on a stainless steel surface, and belongs to the technical field of surface microstructure preparation. Background technique [0002] Stainless steel has excellent properties such as aesthetics, corrosion resistance, good ductility, and easy processing. It is widely used in construction, medical equipment, food processing, and household appliances, such as building decoration materials, elevators, stair handrails, railings, biomedical materials, Implanted materials, surgical instruments, food processing machinery, dining carts, food racks, sinks, cabinets, cupboards, washing machine liners, showers, water tanks, door handles, etc. [0003] In recent years, more and more researchers have turned their attention to the preparation of microporous structures on the surface of stainless steel in order to further b...

AI Technical Summary

Problems solved by technology

The chemical corrosion method is to put stainless steel in a certain acid solution, and use the acid to corrode the surface of the stainless steel to form micro-pits of a certain size and density. Uniform, unsatisfactory for the above functional materials

The vacuum aluminum plating + anodic oxidation method is to deposit a thin layer of aluminum on the surface of stainless steel by physical vapor deposition, and then use anodic oxidation to prepare a nanoporous aluminum oxide microporous structure on the surface of the aluminum coating, with a micropore diameter of 25-100nm and a pore density of up to 10 9 / cm 2 , the effect is good for the above functional materials, but due to the obvious interface between the aluminum coating and the stainless steel substrate, the aluminum coating is easy to peel off from the surface of the substrate

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