155 results about "Surface corrosion" patented technology

The invention discloses a method for improving performance of rare earth permanent magnet sintered neodymium iron boron grain boundary diffusion, and belongs to the technical field of rare earth permanent magnet materials. The method comprises the steps that a low-melting-point metal layer and a diffusion layer containing heavy rare earth elements are sequentially formed on the surface of a clean sintered neodymium-iron-boron magnet, and then vacuum diffusion heat treatment and tempering treatment are conducted. Wherein the low-melting-point metal layer comprises at least one of copper, aluminum, gallium and tin or an alloy of the copper, the aluminum, the gallium and the tin; the heavy rare earth element comprises at least one of dysprosium, terbium, holmium and gadolinium. The low-melting-point metal layer is preferentially diffused and wets the grain boundary in the heat treatment process, heavy rare earth elements are promoted to be deeply and uniformly diffused towards the interior of the magnet along the grain boundary, so that a heavy rare earth-rich shell layer is formed outside main phase grains of the magnet, and the intrinsic coercive force is improved; meanwhile, the low-melting-point metal forms a strengthening phase at the grain boundary, the brittleness of the magnet after diffusion is improved, the surface corrosion phenomenon is restrained, and collaborative optimization of the comprehensive performance of the magnet is achieved.

The invention relates to the technical field of processing, testing or inspection of aircraft parts, and provides a surface corrosion evaluation method for an aluminum alloy plate with an epoxy coating, which comprises the following steps: acquiring an aluminum alloy plate sample with an epoxy coating at different time after being exposed in a coastal atmospheric environment, collecting two-dimensional closed corrosion area image data of the surface of the sample, and calculating the surface corrosion of the aluminum alloy plate with the epoxy coating according to the two-dimensional closed corrosion area image data; processing the image to extract a closed boundary of the corrosion area; calculating the boundary length of the corrosion area and the included corrosion area, and calculating the fractal dimension of the corrosion area based on the length and the area; according to the method, the correlation model between the fractal dimension of the corrosion area and the exposure corrosion time is established, the interval distribution of the fractal dimension under different corrosion time is determined, the method is used for evaluating the corrosion state and the development trend of the corrosion state, the limitation of parameter evaluation modes such as subjective judgment and single corrosion depth is avoided, and the accuracy and objectivity of a corrosion evaluation result are effectively improved.

The invention provides a treatment method for synergistically enhancing the comprehensive performance of a neodymium-iron-boron magnet, and belongs to the technical field of magnetic materials. According to the method, a heavy rare earth layer and a corrosion-resistant metal layer such as copper, nickel and cobalt for promoting grain boundary diffusion of heavy rare earth are respectively deposited on the surface of the neodymium-iron-boron magnet by adopting a multi-layer electroplating method, the coercivity of the neodymium-iron-boron magnet is enhanced through grain boundary diffusion, and the corrosion resistance of the magnet is enhanced through a nickel-cobalt coating. The treatment method comprises the following steps: carrying out electrochemical deposition on the neodymium-iron-boron magnet in a heavy rare earth metal plating solution, and then respectively electroplating a copper plating layer and a nickel-cobalt plating layer to obtain a heavy rare earth-containing plating layer with strong corrosion resistance and good plating film binding force; the neodymium-iron-boron magnet containing the heavy rare earth coating is subjected to heat treatment, and the coercive force of the magnet is improved through heavy rare earth grain boundary diffusion. The neodymium iron boron grain boundary diffusion process and the surface corrosion prevention process are subjected to integrated treatment, the technological process of high-performance neodymium iron boron industrial preparation is shortened, and the coercive force and the corrosion resistance of the magnet are comprehensively enhanced.

The disclosure provides a composition including a corrosion inhibitor compound and an iron chelating agent. The composition may be used in a method of inhibiting corrosion of a metal surface. The method includes adding the composition to an aqueous system that includes the metal surface. The composition may be applied to the metal surface, for example, using batch treatment techniques.

The invention discloses a phased array detection process and verification method of a gas production tree drift diameter flange sealing surface simulation test block, and relates to the technical field of petroleum and natural gas wellhead device detection, and the phased array detection process comprises the following steps: S1, obtaining a test block design reference; s2, obtaining sound velocity parameters and baseline echo data; s3, obtaining a scanning parameter table matched with the defect type; s4, obtaining a TCG calibration curve and gain setting for detection; s5, obtaining original time sequence echo data and imaging data; s6, generating a final detection result and a verification report; according to a defect type scanning scheme, 100% detection of sealing surface corrosion and bolt hole transverse and longitudinal cracks is realized, and no detection blind area exists; the quantitative precision is high, specifically, the defect quantitative error is controlled within + / -1.1 mm through targeted TCG calibration, and the precision is improved by 40% compared with that of a conventional process; based on a standardized verification process of a fixed model test block, different operators use the same equipment for detection, and the data variation coefficient is less than or equal to 5%; and the adaptability is high.

The application discloses an evaporator steel wire shelf phosphating and plastic dipping integrated treatment device and belongs to the shelf processing field. The evaporator steel wire shelf phosphating and plastic dipping integrated treatment device comprises a plastic dipping tank and a phosphating tank, a heating channel is arranged between the plastic dipping tank and the phosphating tank, a conveying assembly is arranged above the plastic dipping tank, a liquid receiving disc is arranged at the bottom of the conveying assembly, a flow stabilizing assembly is arranged in the liquid receiving disc, and splash-proof assemblies are arranged on the two sides of the liquid receiving disc. The liquid receiving disc is integrally suspended at the bottom of the conveying assembly, and the liquid receiving disc can receive and collect mechanical lubricating grease and residual processing liquid dripping from the mechanical moving components above, so that the fluidized plastic powder in the plastic dipping tank is effectively prevented from being damped and caked or chemically deteriorated due to the dripping of the fluid downward, the pinholes, the immersion blind spots and the subsequent rust hidden dangers of the shelf surface coating caused by the dripping pollution are completely eliminated, and the surface corrosion prevention quality and the yield of the medical equipment are remarkably improved.

The application discloses a modified ferruginous mineral material for improving wear resistance and corrosion resistance of cement and a preparation method of the modified ferruginous mineral material, and raw materials include calcium components 40-70%, aluminum components 5-30%, ferruginous components 5-30% and active regulators 0-5% in percentage of mass. The modified ferruginous mineral material for improving wear resistance and corrosion resistance of cement can significantly improve cement chloride solidification capacity, wear resistance, reduce the probability of steel surface corrosion by chloride ions, and achieve the purposes of steel corrosion prevention and cement wear resistance in reinforced concrete when the modified ferruginous mineral material is added into cement as admixture.

The utility model discloses an alloy pipe surface corrosion-resistant treatment device, which relates to the technical field of alloy pipe processing, and comprises a treatment box body and supporting legs arranged at the bottom of the treatment box body, and further comprises a spraying assembly, a drying assembly, a transmission assembly and a stirring assembly. According to the utility model, the treatment liquid is uniformly sprayed on the surface of the alloy pipe through the spraying assembly, so that compared with a traditional soaking mode, the treatment liquid can be fully and uniformly contacted with the surface of the pipe, the uniformity of corrosion-resistant treatment on the surface of the alloy pipe is effectively improved, and the overall corrosion resistance is improved; the drying assembly of the equipment can enable hot air flow to continuously act on the alloy pipe through the fan, so that residual treatment liquid on the surface of the alloy pipe is quickly blow-dried, and adverse effects of the residual treatment liquid on subsequent processing and use are avoided.

The application discloses a kind of corrosion-resistant magnesium alloy with self-repair protection and preparation method thereof, it is related to magnesium alloy technical field, the mass percentage content of each component of the corrosion-resistant magnesium alloy includes: Al: 6-15%;Mn: 0.01-0.3%;Y: 0.1-2%;Cd: 0-0.1%;Be: 0-0.1%;The rest is Mg and unavoidable impurities.By adding trace alloying elements to control the organization, with the help of dense passivation oxide film formed on the surface of alloy matrix, to inhibit the corrosion failure problem caused by the damage of matrix surface film layer to pitting or surface corrosion, under long time neutral salt solution environment, when local corrosion occurs on the surface of magnesium alloy matrix, the protection of autogenous passivation film can prevent the corrosion medium from continuing to expand to the inside of matrix, and the formation of multiphase in the organization is avoided as much as possible, and the number of primary cell is reduced, so as to reduce electrochemical corrosion.

The utility model discloses surface anti-corrosion spraying equipment which comprises a device shell, two baffles are fixedly connected to the inner wall of the device shell, and a collecting hopper is fixedly connected to the inner wall of the device shell. According to the surface anti-corrosion spraying equipment provided by the utility model, the transmission roller in the middle can be driven to rotate by starting the driving motor, and the other transmission rollers are driven to rotate by the corresponding chain wheel and the protective shell, so that ferrous metal can be placed on the transmission rollers, and the rotating transmission rollers drive the ferrous metal to enter the middle part of the device shell; in the process that conveying rollers drive the ferrous metal to move, rotation of the middle conveying roller drives a large belt wheel to rotate along with the conveying rollers, then a small belt wheel rotates along with the large belt wheel through a belt, and then anti-corrosion liquid in an anti-corrosion liquid box can be stirred through a connecting rod and stirring blades; the situation that the follow-up anti-corrosion effect is poor due to the fact that components in sprayed anti-corrosion liquid are not evenly distributed is reduced.

The invention discloses a cyclic load and electrochemistry collaborative testing device and a testing method, and belongs to the technical field of material corrosion and mechanical property testing. The device comprises a load applying unit, an electrochemical testing unit, a sample clamp and corrosion pool unit and a data synchronization control module. The test method comprises the steps of sample preparation, device assembly, static electrochemical test and electrochemical collaborative test under cyclic load. The core of the invention lies in that through the data synchronization control module, the electrochemical test is accurately controlled to be triggered when the cyclic load reaches a peak value, and in-situ and synchronous coupling of a dynamic stress field and a corrosion environment is realized. According to the method, the defect that fatigue and corrosion tests are separated in the prior art is overcome, the complex working condition of the material in actual service can be truly reduced, the acceleration or inhibition effect of cyclic stress on the surface corrosion behavior of the material is accurately represented, and the research and evaluation precision of the corrosion fatigue performance and failure mechanism of the material is remarkably improved.

The invention discloses a finite element shell element model modeling method and system considering metal surface corrosion random morphology. The method comprises the following steps: obtaining metal surface corrosion morphology three-dimensional point cloud data of a corroded component through three-dimensional laser scanning; performing dimension reduction on the three-dimensional point cloud data, judging whether the corrosion form of the metal surface is uniform corrosion or not, if so, calculating a physical regression equation based on the expanded point cloud data, and constructing a corrosion random morphology model based on superposition of a corresponding uniform corrosion depth on a corrosion texture generating a corresponding weight loss ratio; if not, constructing a corrosion random morphology model based on the learned corrosion texture; generating a corrosion morphology by using the corrosion random morphology model; performing regular grid division and numbering operation on the corrosion random morphology model; material attribute endowing is completed based on grid partitioning and numbering, and grid encryption division is carried out; and based on the shell element geometric model with the given thickness, parameter setting is completed, and a finite element shell element model is obtained.

The utility model relates to steel pipe processing technical field, and disclose a kind of steel surface cleaning mechanism in steel pipe processing process, including rack, the middle part of support is fixedly installed with servo motor, the output shaft one end of servo motor and located in rack is all provided with reciprocating transmission assembly driven by servo motor, and the left and right ends of the reciprocating transmission assembly are all provided with cleaning assembly for rubbing and scraping off rust and other impurities on steel surface, the left and right sides of the rack are all fixedly installed with support plate, and the end of support plate is provided with wiping assembly for wiping steel surface;Through the rotation of carousel, it will drive rotating column synchronous rotation, and then it will drive rotating column extrusion back to the inner wall of frame, and then it will make back to the frame back and forth push-pull reciprocating slide rod, so it will drive the mounting seat of both sides synchronous back and forth movement, and then it will drive the friction plate clamped on the both sides of steel surface back and forth sliding and clean its surface corrosion, to achieve cleaning effect.

The utility model relates to the technical field of ship hydraulic control equipment, in particular to a modularized integrated control valve group for a ship hydraulic clutch. The device comprises a main valve group, a first functional module valve group, a second functional module valve group, a third functional module valve group and a top plate are sequentially arranged above the main valve group, and the first functional module valve group and the third functional module valve group are the same in internal structure; according to the utility model, a modularized sandwich valve group framework is adopted, and standardized valve block units are superposed on the basis of a main oil inlet valve block, so that a main valve block does not need to be redesigned when a module is newly added, a control loop can be expanded only by increasing or decreasing the standardized units, and the volume and complexity of multi-path control are remarkably reduced; aiming at a ship high-salt-fog environment, the valve block base material is made of high-strength aluminum alloy and adopts the zinc-plated nickel alloy composite coating, the surface corrosion resistance is improved through the electroplating and passivation dual process, and meanwhile, the salt-fog-resistant elastic sealing ring is used, so that the leakage risk caused by corrosion is reduced.

The invention discloses a solid waste filling method based on cooperation of an MICP technology and carbon dioxide mineralization. Gangue aggregate is treated through microbial infiltration; cO2 is introduced into the alkaline solid waste for carbonation treatment, so that the alkalinity of the alkaline solid waste is reduced, and CO2 is absorbed and cured; the microbe modified aggregate and the mineralized solid waste slurry are fully mixed according to a reasonable ratio to form the filling slurry with stable performance. After the slurry is injected into the goaf, calcium carbonate is formed through induction of the MICP technology, calcium carbonate crystals are further generated, internal pores of the material are effectively filled, and the compactness and certain mechanical performance of the grouting body are enhanced. The method can synchronously and efficiently solve the problem of treatment of solid wastes such as coal gangue and fly ash, realizes large-scale storage of CO2, provides a filling body with excellent mechanical properties for a goaf, enhances the surface corrosion resistance and improves the bonding property with surrounding rock.

The present disclosure relates to a nickel plated steel sheet for a battery case having excellent corrosion resistance and a method for manufacturing the same. In one embodiment, the nickel plated steel sheet comprises: a base steel sheet; a nickel plating layer formed on one or more surfaces of the base steel sheet; and a nickel-iron (Ni—Fe) diffusion layer formed between the base steel sheet and the nickel plating layer; wherein the nickel plating layer and the nickel-iron (Ni—Fe) diffusion layer are formed by forming an electro-nickel plating layer on the base steel sheet and an electroless nickel plating layer on at least a portion of the surface of the electro-nickel plating layer, followed by heat treatment, and the nickel plating layer includes one or more co-deposited elements selected from phosphorus (P), boron (B), tungsten (W), cobalt (Co), molybdenum (Mo), and copper (Cu) on its surface.

The utility model relates to the technical field of cooking utensils, in particular to a pot. The pot body of the pot comprises the iron layer and the stainless steel layer which are stacked in the thickness direction, the iron layer can guarantee the heat transfer efficiency, the stainless steel layer is resistant to corrosion, the proportion of the iron layer to the stainless steel layer is made to meet 1: 1-3: 1, the pot body can balance heat conductivity and surface corrosion resistance at the same time, cooking efficiency is guaranteed, and meanwhile the pot body is protected against heat loss. The risks of perforation, sand holes and the like caused by long-term use of the pot body are reduced, and the service life of the pot body is prolonged.

The invention discloses a preparation method and application of a zinc negative electrode of a pre-corrosion in-situ modified water-based zinc ion battery, and provides the water-based zinc ion battery at the same time. The zinc negative electrode of the pre-corrosion modified aqueous zinc ion battery is one of a pre-corrosion in-situ zinc tungstate composite zinc electrode (ZnWO), a pre-corrosion in-situ zinc molybdate composite zinc electrode (ZnMoO), a pre-corrosion in-situ zinc vanadate composite zinc electrode (ZnVO) and a pre-corrosion in-situ zinc silicate composite zinc electrode (ZnSiO). The application of the corrosion reaction on the surface of the metal zinc negative electrode is discussed for the first time, the corrosion reaction on the surface of zinc is utilized to form the corresponding compact, multifunctional, stable and insoluble pre-corrosion in-situ zinc salt composite zinc electrode, various side reactions are relieved, uniform zinc deposition is guaranteed, the zinc is not prone to falling off in the repeated zinc deposition stripping process, and the service life of the zinc electrode is prolonged. And finally, stable and long-acting application of the aqueous zinc ion battery is realized.

The present invention provides a method for processing printed circuit boards, comprising: preparing an acidic oxidizing agent solution, wherein the acidic oxidizing agent solution comprises ferrous oxide, nitric acid, and hydrochloric acid; placing the printed circuit board in the acidic oxidizing agent solution and controlling the immersion temperature and immersion time; and removing the printed circuit board and cleaning it. This processing method is highly efficient and effective, reducing surface corrosion and environmental pollution.

The invention discloses an automobile body inner cavity electrophoresis test method which comprises the following steps: S1, manufacturing a test device which comprises a first pretreatment steel plate and a second pretreatment steel plate; s2, putting the test device into an electrophoresis tank, enabling the first pretreatment steel plate to be opposite to an anode electrode in the electrophoresis tank, and then carrying out an electrophoresis test; s3, the second pretreatment steel plate is taken out, and a circulating salt spray test is conducted; s4, treating after the test; s5, removing corrosives on the surface of the second pretreatment steel plate; and S6, measuring the height of a paint film on the surface of the second pretreatment steel plate. According to the electrophoresis test method for the inner cavity of the automobile body, the inner cavity anti-corrosion condition can be visually evaluated by using the inner cavity upper film sample plate to carry out the circulating salt mist experiment, circulating salt mist is introduced into the normal-temperature, normal-humidity, high-temperature and high-humidity environment compared with neutral salt mist, the circulating salt mist is closer to the atmospheric environment use condition, and it is ensured that the inner film electrophoresis anti-corrosion condition can be correctly evaluated.

The invention relates to the field of metal material surface modification technologies and cooker manufacturing, in particular to a preparation method of a coating-free hydrophobic low-carbon steel non-stick iron pan. Comprising the following steps: step 1, selecting a base material: selecting low-carbon steel with the carbon content of less than or equal to 0.2% as the base material; secondly, heat treatment is conducted, specifically, the base material in the first step is subjected to two-stage heat treatment, austenitizing heat preservation is conducted firstly, then air cooling is conducted to the room temperature, and then low-temperature tempering is conducted; and step 3, surface corrosion modification: preparing a corrosive liquid which is a mixed system of ethanol with the volume fraction of 96% and nitric acid with the volume fraction of 4%, and soaking the base material subjected to heat treatment in the step 2 in the ethanol-nitric acid mixed corrosive liquid prepared by the method under the condition of normal temperature. According to the method, the grain size and the grain boundary state of the base material are optimized through the optimized heat treatment process, a uniform and compact micron-sized rough grain boundary structure is formed on the surface of the base material through the selective corrosion effect of the corrosive liquid on the grain boundary, and the non-stick effect is achieved; the process is simple and suitable for large-scale industrial popularization.

The utility model relates to diamond net surface anticorrosion weather-proof processing equipment which comprises a diamond net, an electroplating device, a gum dipping device, a control power supply cabinet and an electrical wire, the electroplating device and the gum dipping device are arranged in parallel, and the control power supply cabinet is arranged on one side of the electroplating device and one side of the gum dipping device. The electroplating device and the gum dipping device are connected with the control power supply cabinet through electrical wires, and the rhombic net is connected in the electroplating device and the gum dipping device in a penetrating mode. According to the utility model, the processing setting of the diamond net is optimized, the traditional electroplating processing mode is changed, the diamond net is improved into a continuous electroplating device, and the impregnation process is added after electroplating, so that the weather resistance and the corrosion resistance of the diamond net are enhanced, the service life of the diamond net is greatly prolonged, and the diamond net is suitable for popularization and use.

The utility model discloses a surface anti-corrosion treatment device for a steel structure, which belongs to the field of steel processing and comprises a working table, a mounting groove is formed in the top of the working table, a plurality of conveying rollers are rotatably connected in the mounting groove, a support is fixedly connected to the top of the working table, a spraying mechanism is arranged on the support and comprises a storage box, and the storage box is fixedly connected with the working table. Two sets of blocking mechanisms are symmetrically arranged on the front side and the rear side of the spraying mechanism, each blocking mechanism comprises a hydraulic cylinder fixedly connected to the front wall and the rear wall of the support, baffles are fixedly connected to the other ends of the hydraulic cylinders, and collecting boxes are detachably connected to the sides, close to each other, of the baffles; a connecting assembly is arranged between the adjusting assembly and the baffle. The anti-corrosion liquid collecting device has the beneficial effects that the hydraulic cylinder drives the baffle to drive the collecting box to move, the collecting box abuts against a steel plate, splashing anti-corrosion liquid is blocked on the baffle and then downwards flows into the collecting box along the baffle to be collected, and waste is avoided.

The application provides a lifting type water mist bird repelling and cleaning linkage system, which realizes long-term and stable active bird damage prevention and control through a composite dynamic bird repelling mode of lifting action combined with water mist spraying, reduces the risk of photovoltaic panel light blocking, surface corrosion and hot spot effect caused by bird excretion from the source; through the intelligent control system, the photovoltaic panel cleaner is automatically triggered to start cleaning operation after the bird repelling operation is completed, which can not only timely remove the bird droppings, dust and other stains left after bird repelling, but also can simultaneously process the water droplets condensed on the surface of the photovoltaic panel after water mist spraying, completely avoiding the safety hazards of stain residue and secondary hot spot caused by water droplets due to the lag of traditional manual cleaning and the lack of linkage of automatic cleaning, realizing the unmanned and automatic control of the whole process of bird repelling and cleaning operation, and adapting to the large-area and scattered water photovoltaic array layout of fish-light complementary power stations.

The invention discloses an aluminum alloy surface anti-corrosion composition and a preparation method and application thereof.In the surface anti-corrosion composition, a WC hard phase provides the framework hardness of a coating, a Co-Cr metal phase endows the coating with good toughness, and the WC hard phase and the Co-Cr metal phase act synergistically, so that the obtained coating has excellent hardness, wear resistance and corrosion resistance; according to the surface anti-corrosion composition, rare earth powder is introduced to serve as an auxiliary, grains can be refined, grain boundaries can be purified in the coating, formation of a denser coating is promoted, an optimized Co-Cr metal phase is combined, and the corrosion resistance of the surface anti-corrosion composition is greatly improved. The long-acting corrosion resistance of the coating in severe environments such as salt mist and damp and hot environments is remarkably improved through synergism, bubbling and stripping of the coating and corrosion of a base body are effectively inhibited, and the remarkable corrosion resistance effect is achieved on the whole.

The invention belongs to the technical field of metal material surface corrosion prevention, and discloses a pitting-resistant corrosion inhibitor coated GO-Al-based composite coating as well as a preparation method and application of the pitting-resistant corrosion inhibitor coated GO-Al-based composite coating. The method comprises the following steps: adding aluminum powder into a GO aqueous solution and a corrosion inhibitor aqueous solution for ultrasonic dispersion; carrying out static settlement, filtering, washing and vacuum drying to obtain modified aluminum powder, and mixing the modified aluminum powder with alumina powder to obtain mixed powder; under the pressure of 0.6-0.8 MPa, carrying out sand blasting treatment on the magnesium alloy matrix by adopting silicon carbide to enable the surface roughness of the magnesium alloy matrix to be 1-3 microns, so as to obtain a pretreated magnesium alloy matrix; and the mixed powder is sprayed on the surface of the pretreated magnesium alloy matrix, and the corrosion inhibitor coated GO-Al-based composite coating is prepared. The composite coating releases a corrosion inhibitor at the crack defect position, a hydrophobic adsorption film is generated, invasion of a corrosion medium and pitting corrosion of the Al coating can be effectively blocked through cooperation with graphene oxide, the corrosion resistance of the Al-based coating is enhanced, and the composite coating can be applied to the field of metal surface corrosion resistance.

The invention relates to a method for detecting electrochemical corrosion and durability of a PET (Polyethylene Terephthalate)-based adhesive tape in an electrolyte in the field of intelligent manufacturing, which comprises the following steps: acquiring initial surface topography data of a material in an electrochemical environment, and determining microstructure characteristics according to the initial surface topography data; acquiring electric field distribution data in the electrochemical environment, and determining ion migration characteristics according to the electric field distribution data; determining the initial corrosion state of the surface of the material according to the ion migration characteristics and an electrochemical impedance spectroscopy measurement value; obtaining corrosion morphology evolution data according to the surface corrosion initial state; determining corrosion-dissolution associated parameters according to the corrosion morphology evolution data and the concentration data of the dissolved matter in the electrolyte; according to the corrosion-dissolution associated parameters, analyzing the dynamic relationship between the microscopic change of the surface of the material and the concentration of the dissolved substance to obtain the tolerance degradation trend of the material; and predicting a durability evaluation result of the material in a long-term electrochemical environment according to the tolerance degradation trend of the material.

The invention provides nanocrystalline surface hardened austenitic stainless steel and a preparation method thereof.The microstructure of the stainless steel is an isomerous austenitic structure wrapped by nanometer isometric crystals, and the preparation method of the nanocrystalline surface hardened austenitic stainless steel comprises the following steps that firstly, the austenitic stainless steel plate is subjected to low-temperature cross rolling deformation treatment, and rolling deformation in different directions is controlled; inducing to form deformation-induced martensite strip structures which are uniformly distributed and mutually crossed; then a rapid heating technology is used for enabling deformation to induce the martensite to inversely change into hardened austenite; then nanosecond laser melting treatment is conducted on the surface of the stainless steel plate, so that nano-sized isometric crystals are obtained on the surface; and finally, the steel plate subjected to laser melting is subjected to warm rolling deformation treatment, residual tensile stress introduced to the melting surface is converted into pressure stress, and the surface corrosion resistance is further improved while the yield strength of the steel plate is improved. While the yield strength of the austenitic stainless steel is improved, good corrosion resistance and plasticity can also be considered.