482 results about "Salt spray test" patented technology

The invention discloses a method for monitoring the corrosion capacity of a circulating salt spray test chamber, and relates to the technical field of aluminum alloys. The method comprises the following steps of test preparation, device configuration and environment debugging, test process management, monitoring and recording, corrosion degree evaluation and report arrangement and summarization. The test box comprises a box body, a positioning mechanism is mounted in the box body, a spraying mechanism is mounted at the top end of the inner wall of the box body, the positioning mechanism is located below the spraying mechanism, a lifting mechanism is mounted on the peripheral wall of the box body, and a collecting mechanism is mounted at the bottom end of the inner wall of the box body; by arranging the positioning mechanism, aluminum alloy materials of different specifications can be positioned, meanwhile, aluminum alloy can be turned over and rotated, then the aluminum alloy can be sprayed more uniformly and comprehensively through the spraying mechanism, so that it is ensured that salt mist uniformly and comprehensively covers the surface of a sample, and the quality of the sample is improved. And the accuracy of test data can be improved.

The invention discloses a self-dispersing nano-diamond reinforced coating as well as a preparation method and application thereof, and belongs to the technical field of protective coatings. The self-dispersing nano-diamond reinforced coating provided by the invention comprises a component A and a component B. The component A comprises the following components in parts by mass: 15-35 parts of epoxy resin, 1-30 parts of nano-diamond, 5-15 parts of a solvent and 0.5-1 part of a defoaming agent; and the component B comprises the following component in parts by mass: 2-15 parts of a curing agent. The coating is simple in ingredient, has good effects in adhesive force, impact strength, flexibility, neutral salt spray test and alkaline soaking, is a multifunctional transparent coating with corrosion resistance, wear resistance and antifouling performance at the same time, and has wide application scenes and practical value.

The invention relates to the field of radiator testing, in particular to a radiator salt spray test data intelligent processing method and system.The method comprises the steps that test data in the salt spray test process are obtained and preprocessed, and fitting curves of salt spray concentration data and corrosion current density data are generated respectively; acquiring a peak point of the fitting curve of the salt mist concentration data as a segmentation point, matching the two curves through a dynamic time warping algorithm, and calculating a matching degree to determine the segmentation point on the fitting curve of the corrosion current density data; and calculating a correlation value based on the time difference of the matching point pairs and the shortest path distance, dynamically determining weight distribution of the salt mist concentration data and the corrosion current density data in a forgetting gate formula, correcting the forgetting gate formula, and performing test data prediction by using the corrected LSTM model. According to the method, the correlation values of the corresponding segments of the two curves are calculated, and the weights of the salt mist concentration data and the corrosion current density data in the forgetting gate are dynamically adjusted, so that the adaptability of the model to complex data and the prediction accuracy are improved.

The invention relates to the technical field of wind power blade material testing, and discloses a testing device and method for a salt spray corrosion test of a wind power blade composite material layer. According to the method, wind power blade composite material coating preparation parameters are obtained, and coating basic information is provided for subsequent performance evaluation; based on preset salt spray test environment control parameters, dynamic salt spray environment simulation conditions are generated so as to better fit the actual outdoor environment; then, a multi-sensor coupling monitoring network is constructed, real-time data acquisition is conducted on the corrosion process of the composite material coating, and comprehensive tracking of the corrosion process is achieved; processing real-time data by utilizing a corrosion characteristic analysis algorithm, generating a multi-dimensional corrosion characteristic index, and quantitatively representing the corrosion condition of the coating; and finally, evaluating the anti-corrosion stability of the new material coating in combination with the coating characteristic parameters and the multi-dimensional corrosion characteristic indexes. According to the method, the corrosion resistance of the coating in the actual environment can be more accurately reflected, and support is provided for research, development and application of the composite coating of the wind power blade.

The invention discloses corrosion resistance test equipment for a skylight cross beam, relates to the technical field of cross beam tests, and aims to solve the technical problems that a corrosion test of a static placement cross beam sample cannot reflect the influence of dynamic stress on corrosion cracks in the cross beam, and particularly whether stress corrosion cracking can be caused in a salt spray environment or not. Comprising a salt spray testing machine, the salt spray testing machine comprises a test box body, a plurality of test rack assemblies are arranged in an inner cavity of the test box body, each test rack assembly comprises a static test rack and a dynamic test rack, each dynamic test rack comprises a rhombic movable rack, and each rhombic movable rack comprises an upper pressing block, a lower falling block, two symmetrically-arranged bearing blocks and four movable rods. A jolting pressing assembly is arranged at the bottom of the upper pressing block. The device has the advantages that the cross beam sample is in a dynamic stress state in a salt spray corrosion test, the stress condition of the cross beam in actual use is truly simulated, and the test environment is highly close to the actual working condition.

The invention discloses a cyanide-free cadmium-iron alloy plating process for high-strength structural steel. The cyanide-free cadmium-iron alloy plating process comprises the step that a nickel-titanium alloy plating layer, a cyanide-free cadmium-iron alloy plating layer and a hexavalent chromium passivation film are sequentially prepared on a high-strength structural steel substrate from inside to outside. The prepared sample piece is subjected to a hydrogen brittleness test according to HB 5067.1-2005 Part 1 of hydrogen brittleness test of plating process: Mechanical Method, and the test result meets the standard requirement; the surface of a plated part is free of white rust after being subjected to an acetate mist test for 400h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, and a plating layer of the plated part has excellent corrosion resistance; according to GB / T 5270-2005 < GB / T 5270-2005 < GB / T > 5270-2005 < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB /

The invention relates to an automobile exterior TOM film and a salt spray testing device thereof, and relates to the technical field of decorative films. The automobile exterior decoration TOM film comprises a surface protection layer, a decoration layer, a bonding layer, a substrate and a back glue layer which are sequentially arranged, the automobile exterior TOM film salt mist testing device comprises a salt mist reaction kettle, a salt mist plate is arranged in the salt mist reaction kettle, and a mist making piece is further arranged in the salt mist reaction kettle; the salt mist plate can rapidly clamp the automobile exterior decoration TOM film, and the clamping stability of the automobile exterior decoration TOM film can be greatly improved while rapid installation is achieved; furthermore, the salt spray test can be carried out on automobile exterior decoration TOM films with different sizes, so that the applicability of the device is greatly improved; the mist making piece can automatically spray salt mist into the salt mist reaction kettle and can also control the concentration of the sprayed salt mist, so that the corrosion resistance of the automobile exterior TOM film in salt mist environments with different concentrations is detected.

The invention is applicable to the technical field of industrial image processing, and provides a coating surface defect grade image recognition and evaluation method, which is based on deep learning and image splicing technologies, comprises the following steps of: shooting substrate images in blocks, splicing the substrate images into a high-precision complete image, extracting an ROI (Region of Interest), and inputting the ROI into an improved semantic segmentation model; and outputting a defect mask and calculating an area ratio, and performing automatic defect grade evaluation by combining GB / T 1766-2008 and ISO 4628-3: 2016 standards. According to the method, the problems of low manual detection efficiency, high subjectivity and inaccurate small-area defect rating are solved, the detection speed is increased to 3-5 seconds per sample, the rating result is objective and reliable, and the method is suitable for efficient detection and quantitative analysis of coating defects such as rusting, peeling and bubbling after the salt spray test.

The invention discloses a salt spray test box, which belongs to the technical field of corrosion resistance testing, and comprises a salt spray test box body, and an anti-blocking mechanism is arranged in the salt spray test box body; according to the salt spray test box, the anti-blocking mechanism is arranged, so that the problem that the salt spray test box is easily blocked by salt particles in the long-time operation process is effectively solved, the anti-blocking mechanism adopts matched work of a cleaning brush, a scraper blade and a reset spring, continuous cleaning of a filter screen and a conveying pipe is ensured, and specifically, after a salt-water mixture enters the conveying pipe, the salt-water mixture is prevented from entering the conveying pipe; the transmission system drives the support to rotate, the support rotates to drive the reset spring to rotate and push the supporting plate and the cleaning brush to move, the cleaning brush is tightly attached to the surface of the filter screen, automatic cleaning is carried out, undissolved salt particles are prevented from entering the conveying pump and the spray head, and it is ensured that salt water can be evenly and cleanly conveyed to a test sample; and equipment faults caused by salt particle blockage are avoided.

The invention discloses a material tensile strength testing device suitable for a high-humidity and high-salt environment, the material tensile strength testing device comprises a box body, two connecting plates are fixedly connected to the rear side, close to the top, of an inner cavity of the box body, the two connecting plates are arranged in a bilateral symmetry mode, and two concentric-square-shaped frames are jointly and fixedly connected between the two connecting plates; through mutual cooperation of a driving gear, a concave mounting plate, an A-shaped mounting plate, a driving motor, a cleaning gear, an inner gear ring and the like, the outer surface of a reinforcing steel bar can be pretreated, and the situation that a test result is affected by corrosion of the surface of the reinforcing steel bar is prevented; through mutual cooperation of a component moving motor, a connecting plate, a double-thread lead screw, a moving block, a salt spray test box, a linkage rod, absorption cotton and other components, when a steel bar is tested in a continuous salt spray environment, salt spray liquid drops are attached to the outer surface of the steel bar, so that the surface of a sample is condensed; a local electrolyte membrane can be prevented from being formed on the surface of the steel bar to accelerate pitting corrosion or galvanic corrosion.

The invention discloses a coating, a preparation method and application, and relates to the technical field of anticorrosive coatings. A dry film of the coating comprises 0.1 wt%-6wt% of a lamellar filler; the lamellar filler is prepared by loading magnetic nanoparticles on the surfaces of two-dimensional nanoparticles and coating a layer of high-molecular polymer. After the coating forms a film, a specific magnetic control orientation curing method is matched, so that high dispersion stability and planar orientation arrangement of the two-dimensional nano filler in a resin matrix are realized, and corrosion of water and oxygen to a base material can be effectively blocked. When the thickness of the coating dry film is only 1-2 microns, the coating dry film still has no obvious corrosion phenomenon after being subjected to a neutral salt spray test for 2000 hours. The metal base material with the thin coating thickness has heat conductivity, corrosion resistance and weather resistance, the preparation process is simple, the cost is low, and the metal base material has extremely high market application value.

The invention provides circulating salt spray testing equipment for detecting corrosion resistance of a nitrided single crystal material, and relates to the field of salt spray testing equipment.The circulating salt spray testing equipment comprises a base, and a salt spray testing box and a control box are installed on the left side and the right side of the upper end face of the base respectively; a partition plate is mounted on the middle side of the interior of the salt spray test box, a rectangular through opening is formed in the partition plate, a vertical rotating shaft is rotationally connected into the rectangular through opening, and a vertical rotating plate is fixedly connected to the exterior of the vertical rotating shaft. According to the salt spray test equipment, the interior of the salt spray test box is divided into two independent test cavities through the partition plate, and a gap between the vertical rotating plate and a rectangular through opening in the partition plate is effectively sealed through the frame-shaped sealing sponge, so that the salt spray test equipment can simultaneously execute dual functions of salt spray and drying, and the test efficiency of the corrosion resistance of a test block is remarkably improved; the problem that in the salt mist and drying testing process of current salt mist testing equipment, the salt mist and drying functions are difficult to execute at the same time, and therefore the testing efficiency is reduced is solved.

The invention relates to a motor shell rusty spot recognition method, device and equipment and a computer readable medium. The method comprises the following steps: acquiring a first motor shell image before a salt spray test and a second motor shell image after the salt spray test; performing image registration on the first motor shell image and the second motor shell image to perform registration on a rusty spot area in the first motor shell image and a rusty spot area in the second motor shell image to obtain an effective motor shell image; performing difference detection on the effective motor shell images before and after the salt spray test, and extracting a newly added rusty spot area based on a difference detection result; constructing a rusty spot recognition model according to the newly added rusty spot area and the corresponding motor shell image; based on the rusty spot recognition model, the rusty spot type of the newly-added rusty spot area is recognized, and the area corresponding to the newly-added rusty spot area is calculated. According to the invention, the problem of low detection efficiency and accuracy caused by manual motor shell rusty spot recognition detection is solved.

The utility model discloses a salt spray test box pump valve control mechanism which comprises a workbench, a test box body is installed on the left side of the top wall of the workbench, a control box body is installed on the right side of the top wall of the workbench, a liquid storage tank is installed in the control box body, and a control assembly is installed on the inner wall of the control box body. The control assembly is communicated with the liquid storage tank, and the mixing assembly is mounted in the liquid storage tank. According to the pump valve control mechanism for the salt spray test box, a product is placed on the top of a placement frame, a salt solution is conveyed into an atomizing spray pipe by a liquid storage tank through a connecting pipe, salt spray is sprayed out until the test box body is filled with the salt solution, a controller controls the salt solution to control a second electromagnetic valve to be closed, and then water is pumped into the liquid storage tank through a left pipeline of a three-way pipe; the liquid level of the solution in the liquid storage tank can be monitored in real time, liquid can be automatically supplemented, real-time adjustment is carried out according to the concentration of the solution, and the situation that the concentration is too high or too low is prevented.

The invention discloses a steel wire rope corrosion resistance testing method, and relates to the technical field of steel wire rope testing. The corrosion resistance test of the steel wire rope for production and processing comprises the following steps: acquiring a salt spray corrosion test data set of a steel wire rope sample, and analyzing the salt spray corrosion test data set of the steel wire rope sample to obtain the steel wire rope sample qualified in salt spray test; acquiring a steel wire rope sample soaking corrosivity test data set of the steel wire rope samples qualified in the salt spray test, and analyzing the steel wire rope sample soaking corrosivity test data set to obtain the steel wire rope samples qualified in the soaking test; acquiring a steel wire rope sample electrochemical corrosion test data set of the steel wire rope samples qualified in soaking test, and analyzing the steel wire rope sample electrochemical corrosion test data set to obtain the steel wire rope samples qualified in electrochemical corrosion test. The corrosion resistance of the steel wire rope in different corrosion environments can be comprehensively evaluated.

The utility model provides a salt spray test box capable of being remotely controlled, and belongs to the technical field of test equipment. A water tank is arranged in the test box body, a matching tank is further arranged on the outer side of the test box body, a water injection pipe communicated with the water tank is connected to the bottom of the matching tank, a stirring assembly is arranged in the matching tank, and a water inlet pipe and a salt outlet of the salt storage tank are connected to the upper portion of an opening of the matching tank. An electronic liquid level meter located in a water tank of the salt spray test box monitors the water level of a solution in the water tank in real time, and when the water tank is in a low water level state, an alarm signal is sent to a handheld remote terminal of a tester through a processing module and a wireless signal receiving and transmitting module; a tester can send the concentration and weight of a sodium chloride solution needing to be blended to the processing module through the remote terminal, then the processing module controls to inject a proper amount of clear water and salt into the matching tank, and after stirring and dissolving, the solution is injected into the water tank for supplementation, and the effect of improving the sodium chloride solution supplementation efficiency of the salt spray test box is achieved.

The invention relates to the technical field of electrical materials, and discloses an anti-corona paint comprehensive failure assessment method based on a salt spray acceleration test, and the method specifically comprises the following steps: carrying out a laboratory salt spray test, and measuring various performance parameters of anti-corona paint at different time points; performing fusion processing of a data driving mode on the multiple performance parameters to obtain a comprehensive performance score; an empirical formula of anti-corona paint salt mist service time and comprehensive performance scoring is constructed, and correlation coefficients are obtained through data fitting; calculating a conversion coefficient through salt spray test parameters and actually measured environmental parameters of the marine atmospheric environment, and correcting the empirical formula; and setting anti-corona paint performance failure boundary conditions, and calculating anti-corona paint failure time through a failure correction formula. The problem that the actual environment damage degree cannot be quantified in an existing salt mist acceleration simulation experiment is solved; the calculation method based on the mathematical model is high in precision degree and reliable in result.

The invention relates to the technical field of glass detection, in particular to a salt spray test device for optical glass performance detection and a test method of the salt spray test device. According to the technical scheme, a plurality of placement frames distributed at equal intervals are installed in a test box body, each placement frame comprises a rotatable frame body, air guide plates are arranged on the two sides of the test box body, a water absorption plate is arranged on the top face of a cover body, arc-shaped flow guide plates are installed at the corners of the cover body in a sliding mode, and the arc-shaped flow guide plates and the water absorption plates are arranged in an attached mode; a pushing piece is arranged on the arc-shaped flow guide plate, and a water diversion piece is arranged in the water absorption plate. The air deflectors and the windward groove bodies are installed on the two sides of the test box body, air is introduced, the guiding and drainage effects on salt mist are formed, rapid diffusion of the salt mist is guaranteed, in addition, when the frame body rotates, the air deflectors incline, and therefore the salt mist can be rapidly dispersed. Therefore, the changed direction can still guide the salt mist airflow to flow towards the optical glass experiment sheet in a path.

The invention relates to the technical field of coatings, in particular to a nano anticorrosive coating. The invention provides a nano anticorrosive coating which comprises a component A and a component B. The component A comprises 40-100 parts by weight of bisphenol A epoxy resin, 0.3-5 parts by weight of cerium dioxide modified hexagonal boron nitride nanosheets and 60-85 parts by weight of lamellar structure zinc-aluminum alloy powder. And the component B comprises 20-40 parts of a polyamide curing agent. The zinc-aluminum alloy particles can enhance the toughness of the coating, and the cerium dioxide and hexagonal boron nitride are added to improve the hardness and wear resistance of the coating. And cerium dioxide and hexagonal boron nitride are added, so that the impedance modulus value of the coating is remarkably improved, the corrosion current density is reduced, and the corrosion resistance of the coating is enhanced. In a salt spray test, the modified coating shows better salt spray resistance, and a coating stripping area is not expanded.

The utility model discloses a spray structure of a salt spray test box, which comprises a box body, a fixed rod is fixedly connected between the inner walls of the two sides of the box body, a connecting pipe is fixedly connected to the middle position of the fixed rod, a spray pipe is movably connected to the bottom of the connecting pipe, a plurality of atomizing nozzles are arranged on one side of the spray pipe, and the atomizing nozzles are arranged on the other side of the spray pipe. A motor is fixedly connected to the outer wall of the bottom of the box body, one end of an output shaft of the motor penetrates through the box body and is fixedly connected with a second gear, an annular convex block is fixedly connected to the inner wall of the bottom of the box body, a first gear is movably connected to the outer side of the annular convex block, the first gear is meshed with the second gear, and the first gear is fixed to the spraying pipe. According to the salt mist spraying device, salt mist can be sprayed out in multiple directions through the atomizing spray head, so that the salt mist is in full contact with a test article, and the test article can be stably clamped by the sliding block through the clamping assembly.

The utility model discloses a salt spray test chamber energy-saving water replenishing device which comprises a workbench, a control cabinet is installed on the left side of the top wall of the workbench, a chamber body is fixedly installed on the left side of the top wall of the workbench, a controller is installed on the front wall of the control cabinet, a water replenishing assembly is installed in the control cabinet, and a placing assembly is installed in the chamber body. An atomization assembly is mounted on the inner bottom wall of the box body. The salt spray test box disclosed by the utility model relates to the technical field of salt spray test boxes. According to the energy-saving water supplementing device for the salt spray test box, the L-shaped placing frame drives the placing plate and the inclined plate to be placed in the box body to be attached to the blocking strip, and the concentration of salt spray in the box body is detected through the concentration sensor, so that when a salt spray corrosion resistance test is carried out, products to be detected can be firstly placed in a classified mode, and multiple batches of tests can be carried out at the same time; the salt solution on the surface of the sample cannot drip to the surfaces of other samples on the lower portion, and when the salt solution is insufficient, water can be automatically supplemented without additional manual intervention.

According to the scheme, the side hanger for the fishing box comprises an integrally-formed connecting bottom and further comprises a side hanger body arranged on the connecting bottom in a swinging mode, a drop ring is arranged on the side hanger body in a penetrating mode, the connecting bottom and the side hanger body are integrally cast and formed through 304 stainless steel, the connecting bottom comprises a connecting plate attached to a side box, and a containing base is arranged on the connecting plate in a protruding mode. The placing base is arranged in a rectangular shape, a fixing base is arranged on the placing base in a protruding mode, the fixing base is arranged in a semi-cylindrical shape, and a connecting hole is formed in the fixing base in a penetrating mode; the utility model belongs to the technical field of fishing gears, and particularly relates to a side hanger for a fishing box, which is firmer in product structure, a bottom plate of the product and a connecting product are made of 304 stainless steel materials, after the product is integrally formed, the product cannot be rusted for 70 hours in a salt spray test, the direction of a drop ring is consistent with that of the product, and the side hanger is more free to rotate and store.

The invention belongs to the technical field of salt spray tests, and particularly relates to a test device and method for simulating hot corrosion of an engine turbine blade material, and the method comprises the following steps: after a sample is cleaned and dried, a nozzle is controlled by a mechanical arm to atomize a saturated salt solution, and the saturated salt solution is precisely sputtered to the surface of the sample preheated to 300-500 DEG C to form a uniform salt film; the sample is placed in a heating furnace at the temperature of 600-1000 DEG C to be subjected to heat preservation for 50-55 min and then cooled by compressed air for 5-10 min, and cold and hot circulation A corrosion kinetic curve is drawn based on the unit area weight increment, corrosion products are removed through a molten alkali electrolysis method, and the hot corrosion rate is calculated. The device comprises a groove type test bed with a high-temperature-resistant coating, a slit type nozzle driven by a mechanical arm, an infrared heating device and a cold and hot circulation system. According to the method, the salt film is deposited through precise position control of the mechanical arm, the cold and hot alternating working condition is simulated, the problems that a traditional salt coating method is not uniform and a salt leaching method is distorted in environment are solved by combining corrosion dynamics and microscopic characteristic analysis, and scientific evaluation of the corrosion resistance of the aero-engine blade material is achieved.

The utility model discloses a uniform humidifying device for a salt spray test box, and relates to the technical field of test boxes. Comprising a test box, the outer wall of the test box is fixedly connected with a control box, the top of the test box is rotatably connected with an upper cover body, the upper cover body is of an inverted V-shaped structure, rectangular grooves are symmetrically formed in the outer wall of the top of the upper cover body, the inner walls of the rectangular grooves are fixedly connected with PVC plates, and the inner wall of the upper cover body is provided with a humidifying assembly; the humidifying assembly comprises two triangular supports, a ring pipe is arranged between the two triangular supports, and the outer wall of the ring pipe is fixedly connected with a positioning block. Installation conditions are provided for the ring pipe and the flow guide pipe through the tripod, the water pipe and the ring pipe are communicated through the flow guide pipe, during testing, after the cover body is covered and saline water is introduced into the ring pipe, the atomizing nozzles on the ring pipe are distributed in an equidistant array mode, and when the saline water is atomized through the atomizing nozzles on the ring pipe, the internal environment of the test box can be evenly humidified.

The invention discloses preparation and application of a protective anticorrosive material for components of wind power equipment and photovoltaic equipment. The material is prepared by mixing and stirring a nano composite epoxy resin matrix, graphene nanosheets, nano zinc powder and other components. During application, the coating is coated after the equipment surface is pretreated, and is cured in a suitable environment. Compared with the prior art, the coating has the advantages that under the synergistic effect of all the components, the coating is free of corrosion after a salt spray test lasts for more than 5000 hours, the anti-aging time lasts for more than 1000 hours due to the nanoparticle and cured network structure, under the synergistic effect of the graphene nanosheets, the nano white carbon black and other components, the abrasion of 100 parts of the protective anti-corrosion material is 2% or below, and the environment-friendly curing agent and the auxiliaries are adopted. The material is simple and convenient in preparation and application process, is suitable for parts such as wind power towers, blades and photovoltaic brackets, and can prolong the service life of equipment, reduce the maintenance cost and promote the development of the clean energy industry.

The invention discloses a corrosion-resistant wrought aluminum alloy containing rare earth and a preparation method of the corrosion-resistant wrought aluminum alloy. The corrosion-resistant wrought aluminum alloy comprises, by mass, 0.05%-0.30% of Fe, 0.05%-0.25% of Si, 0.80%-1.6% of Mn, 0.01%-0.20% of Cr, 0.01%-0.30% of Ti, 0.05%-0.35% of rare earth and the balance Al and impurity elements, and the sum of the mass percentage of the impurity elements is not larger than 0.20%. By adjusting the element types and proportions of the aluminum alloy and adopting the rare earth composite refiner, matrix grain refinement and intermetallic compound modification of the aluminum alloy are achieved, the stability of a surface passivation film is improved, the local corrosion tendency is reduced, and the corrosion resistance is improved; and the maximum corrosion depth is 180 [mu] m or less after exposure for 21 days under a circulating acidic seawater salt spray test of ASTM G85 standards.

The invention relates to a method for eliminating color difference type defects of a stainless steel cold-rolled sheet, which comprises the following steps of: controlling the finish rolling temperature in finish rolling of a plate blank and the coiling temperature after finish rolling, so that the thickness of an oxide layer on the surface of the plate blank is within 8-12 microns; in the cold rolling process, the roller roughness of a last roller is adjusted according to the color difference value of the plate blank so as to reduce the edge color difference and the center color difference of the plate blank; and the annealing process after cold rolling is controlled so that the thickness fluctuation of the Cr2O3 film can be smaller than or equal to 5%. By means of the method for eliminating the color difference defects, the color difference defect rate of the 304 stainless steel cold-rolled sheet is reduced to 0.4% from 2.8%, the overall color difference is smaller than or equal to 0.7, the corrosion resistance of a passive film is improved by 40% (salt spray test is larger than or equal to 96 h), and the international leading level is achieved; and the requirement of a high-quality surface is met.

The invention discloses an automobile part accelerated life test method and system, and the method comprises the steps: setting an extreme temperature cycle: setting a cycle of keeping a low temperature of-40 DEG C for 30 minutes and keeping a high temperature of 180 DEG C for 30 minutes, and setting a temperature change rate of 15 DEG C / min; a multi-physics field coupling test: in an extreme temperature cycle process, synchronously carrying out a resistance test, a withstand voltage test, a turn-to-turn insulation test, a vibration test, a humidity test and a salt spray test, and comprehensively evaluating the electrical, mechanical and environmental adaptability of the parts; multi-scale numerical simulation: establishing material-level, part-level and system-level coupling models, and predicting life distribution of parts; and data-driven optimization: based on historical test data and a numerical simulation result, establishing an acceleration model, dynamically adjusting a temperature cycle parameter and a stress level, and realizing maximization of test efficiency. Based on extreme temperature circulation (-40 DEG C / 30 minutes to 180 DEG C / 30 minutes) and multi-physical field coupling strengthening stress testing, the test time is shortened by 70% or above, and the evaluation error is smaller than or equal to + / -5%.

The invention provides a long-acting anticorrosive epoxy powder coating and a preparation method thereof. The coating comprises epoxy resin, polyester resin, thiadiazole corrosion inhibitor loaded cerium-doped hydrotalcite composite particles, silane modified mica iron oxide, zinc phosphate, barium sulfate and the like. The core innovation lies in that 2-amino-5-(4-hydroxyphenyl)-1, 3, 4-thiadiazole corrosion inhibitor molecules are designed and synthesized, the molecules are loaded between cerium-doped magnesium-aluminum hydrotalcite nano container layers through an anion exchange method, corrosion environment pH responsive gradient release is achieved, a coating constructs a passive shielding, active corrosion inhibition and interface anchoring triple protection mechanism in the coating, and the corrosion resistance of the coating is improved. The neutral salt spray test resistance exceeds 2000h, and the coating is suitable for long-acting corrosion protection of iron accessories and cable bridges.

The invention discloses a salt spray test device for simulating a salt spray environment, and relates to the technical field of material analysis equipment. The device comprises a main box body, a box cover, an ultrasonic salt mist generating device, an axial flow fan, an airflow distributor, an airflow guide device, a salt mist metering device, a control device panel and the like, wherein the main box body is provided with an inner cavity and a top sealing water tank; an auxiliary box body is arranged on one side of the main box body, and the auxiliary box body is provided with an inner cavity and is communicated with the inner cavity of the main box body; the upper end of the auxiliary box body is provided with a sunken saline water tank for storing saline water; the bottom of the ultrasonic salt mist generating device is communicated with the salt water tank through a conduit. Through the innovative structure, many problems of a traditional test are solved, salt mist distribution is optimized, and uniformity is ensured; temperature and humidity are accurately controlled, and simulation is more real; an ultraviolet light source is introduced, the illumination period is precisely regulated and controlled, and the device fits the natural environment; the corrosion resistance of the material can be comprehensively and accurately evaluated, reliable test support is provided for research, development and application of the material, and product quality and reliability are improved.