14 results about "Atmospheric corrosion" patented technology

The application relates to an anti-industrial atmosphere corrosion and anti-seismic steel bar and a preparation method thereof. The anti-industrial atmosphere corrosion and anti-seismic steel bar comprises the following components in percentage by weight: C: 0.17wt%-0.21wt%, Mn: 0.95wt%-1.25wt%, Si: 0.35wt%-0.65wt%, Cr: 0.20wt%-0.40wt%, V: 0.025wt%-0.035wt%, Cu: 0.30wt%-0.50wt%, P: 0.08wt%-0.10wt%, S<=0.010wt%, and the balance is Fe and inevitable impurities.

The application belongs to the technical field of metal corrosion protection, and particularly relates to a composite gas-phase corrosion inhibitor for extreme marine atmospheric environment, a preparation method thereof and application thereof in the protection of metal parts in the field of offshore wind power, ships, offshore platforms and other marine engineering. The composite gas-phase corrosion inhibitor comprises, by mass fraction, 1-2 parts of benzotriazole, 3-5 parts of cysteine, 0.5-1.5 parts of sodium phytate and 6-8 parts of cyclohexylamine carbonate. The application forms a stable and dense protective film on the surface of copper through the synergistic effect of the components, and can effectively block the coupling erosion of high temperature, high humidity, high salinity and strong radiation in the extreme marine atmospheric environment. Experiments show that the corrosion rate of copper sheets can be reduced by more than 95% in the simulated extreme marine atmospheric corrosion liquid. The application has the advantages of strong adaptability to extreme environment, excellent and long-lasting corrosion inhibition effect, environmental protection, non-toxicity, simple preparation, low cost and the like, and is suitable for long-term protection of copper metal components in the field of offshore wind power and other marine engineering, and has a wide application prospect.

This invention proposes a method for evaluating the environmental adaptability of ship hull steel based on atmospheric corrosion simulation, enabling a quantitative characterization of its environmental adaptability under complex dynamic environments. Considering the dynamic evolution of the liquid film under the synergistic effects of salt deliquescence and droplet evaporation in the marine atmosphere, and the nonlinear characteristics of corrosion degradation of ship hull steel under the influence of the dynamic liquid film, a dynamic liquid film model is constructed by coupling key environmental factors. Corrosion process simulation is conducted using corrosion electrochemistry principles, and accelerated testing is used to estimate key model parameters. This establishes a quantitative calculation method for the environmental adaptability index of ship hull steel under dynamic environments, improving the environmental adaptability evaluation system for marine metallic materials and providing scientific support for ship structural reliability design, corrosion protection measure optimization, and service life prediction. This invention requires no additional complex scenario adaptation, is highly operable, and effectively improves the efficiency and practicality of evaluating the environmental adaptability of marine materials.

This invention discloses a high-life, low-cost, large-size round steel bar for hydraulic breaker chisels and its manufacturing method. The chemical composition of the round steel bar, by mass percentage, is: C: 0.32~0.42%, Si: 0.5~1.4%, Mn: 0.80~1.50%, P: ≤0.025%, S: ≤0.015%, Cr: 1.00~1.40%, Cu: ≤0.25%, Mo: 0.05~0.10%, Nb: 0.02~0.04%, Al: 0.015~0.035%, H: ≤0.0002%, with the balance being Fe and unavoidable impurities. The diameter of the round steel bar ranges from 150 to 250 mm. The manufacturing method includes converter / electric furnace smelting, LF refining, RH / VD degassing, continuous casting, billet surface treatment, round steel rolling, and cooling processes, each with precise process parameter control. The round steel prepared by this invention has good hardenability and excellent strength-toughness matching. The service life of the drill rod made from it is 2-3 times longer than that of 42CrMo, and the amount of Mo added is significantly reduced, effectively controlling production costs. At the same time, it improves the atmospheric corrosion resistance of the drill rod, making it suitable for large-scale hydraulic breakers in mining, building demolition and other fields.

This invention provides a method for refining the surface grains of a coating, and a zinc-aluminum-magnesium coated steel sheet, belonging to the field of coating. The method includes: hot-dip galvanizing a steel substrate to obtain a coated steel sheet; cooling the coated steel sheet to a set temperature; and applying a grain refiner to at least a portion of the surface of the coating, wherein the set temperature is 390℃~420℃, and the grain refiner includes potassium fluorotitanate and a mixed salt of potassium fluorotitanate and potassium fluoroborate. By spraying a grain refiner that increases the supercooling of the coating surface, the coating surface is promoted to solidify first, thereby refining the grain structure of the coating. By controlling the temperature at which the grain refiner is sprayed onto the coating surface and the equivalent diameter of the grain refiner, the resulting coating surface has a fine eutectic structure with good atmospheric corrosion resistance and good resistance to under-film filamentary corrosion, making it less prone to under-film filamentary corrosion problems in the atmosphere.

Invention Title: A Marine Atmospheric Corrosion Simulation Device Based on the Coupling Effects of Multiple Environmental Factors Abstract: This invention relates to the field of environmental simulation and material corrosion testing equipment. It discloses a marine atmospheric corrosion simulation device based on the coupling effects of multiple environmental factors, solving the technical problems of existing devices being unable to simultaneously reproduce the coupling effects of multiple environmental factors in the marine atmosphere, having low parameter control accuracy, and incomplete data monitoring. The device includes a support unit, a composite environmental simulation unit, a precision monitoring unit, and an intelligent control unit. These units are electrically connected and work collaboratively. Through a three-in-one salt environment simulation mechanism of "shaking-spraying-atomizing," combined with ultraviolet light, temperature and humidity control, and air pressure balance modules, it achieves the coupled simulation of key environmental factors in the marine atmosphere such as high salinity, wave impact, strong ultraviolet radiation, temperature and humidity fluctuations, and air pressure balance. With multi-parameter high-precision sensors and a data acquisition system, it enables real-time monitoring, recording, feedback, and automatic control of environmental parameters, meeting the corrosion testing needs of different marine atmospheric environmental characteristics. This device is suitable for marine atmospheric corrosion testing, accelerated aging tests and performance evaluation of building materials and structural components in the fields of civil engineering, water conservancy and marine engineering. It has high simulation realism and good coupling effect, providing reliable experimental equipment support for corrosion resistance research of marine engineering materials.

The application discloses a preparation method of a high-strength fastener precipitated hardening stainless steel cold-drawing material, which comprises the steps of alloy ingredient mixing, vacuum smelting, electroslag remelting, hot working treatment, cold deformation strengthening, solid solution treatment and grading aging treatment. The stainless steel material prepared by the application has a tensile strength of no less than 1420 MPa, a yield strength of no less than 1280 MPa, an elongation after fracture of no less than 12.5%, and a Brinell hardness of no less than 430 HB, and simultaneously has excellent atmospheric corrosion resistance and medium corrosion resistance, and is suitable for the severe requirements of high-strength fasteners in the fields of aerospace, high-end equipment, ocean engineering and the like. The process has the advantages of high stability, high repeatability and convenience for industrialized batch production.

The application discloses an experimental device and experimental method for atmospheric corrosion thin liquid film of electrified metal conductor, which comprises a thin liquid film system, a three-electrode system, a constant temperature system and a constant current power supply system; the thin liquid film system provides a corrosion experimental thin liquid film environment for the metal conductor and comprises a container containing an electrolyte solution and a thin liquid film medium wrapping the three-electrode system, the thin liquid film medium extending into the electrolyte solution; the three-electrode system comprises the electrified metal conductor as a working electrode, a reference electrode and a counter electrode; the metal conductor is horizontally fixed through a support, passes through a container of a circulating water device and is connected with the constant temperature system and the constant current power supply system at both ends; the constant temperature system is a circulating water device introduced at both ends of the electrified metal conductor, so that the working electrode realizes a required temperature working condition; and the constant current power supply system supplies power for the metal conductor and provides a required constant current passing through the metal conductor.

This invention relates to the field of corrosion detection technology for metallic materials, and discloses a method for compiling corrosion environment spectra of magnesium alloys in marine atmospheric environments. The method comprises six steps: pre-testing for adaptation of magnesium alloy-marine atmospheric corrosion mechanisms, service environment survey and data acquisition, delineation of magnesium alloy-specific corrosion regions, compilation of individual environmental spectra and parameter quantification, construction and equivalent verification of accelerated corrosion environment spectra, and verification and correction. This invention addresses the lack of adaptability of existing corrosion environment spectra compilation methods to the specific corrosion behavior of magnesium alloys in marine atmospheric environments, enabling the compiled environmental spectra to accurately reflect the corrosion state of magnesium alloys in these environments.

The application provides a 500MPa-grade heavy industrial atmosphere corrosion resistant bridge steel plate, which comprises the following components in percentage by weight: C: 0.03%-0.06%, Si: 0.07%-0.27%, Mn: 0.90%-1.40%, P: ≤0.010%, S: ≤0.003%, Nb: 0.04%-0.06%, Ni: 0.25%-0.45%, Cu: 0.30%-0.60%, Mo: 0.20%-0.40%, Cr: 2.0%-3.3%, Ti: 0.010%-0.03%, Sb: 0.03-0.12%, Al: 0.015%-0.040%, and Cr / Mo: 6-12. The balance is iron and inevitable impurities. The production method of the steel plate comprises smelting, continuous casting, slab heating, rolling, cooling, straightening and tempering. The yield strength of the steel plate is greater than or equal to 500MPa, the tensile strength is greater than or equal to 670MPa, the elongation after fracture is greater than or equal to 23%, the yield strength ratio is less than or equal to 0.80, the thickness direction section shrinkage is greater than or equal to 58%, and the low temperature impact energy at-40 DEG C is greater than or equal to 270J. The annual corrosion rate in the heavy industrial atmosphere environment is less than or equal to 0.03mm / a, and the corrosion performance is 5-10 times higher than that of common Q500qE.

The present application relates to the technical field of metallurgy, and particularly relates to a hot-rolled H-shaped steel alloy and a hot-rolling process thereof, which mainly comprises the following chemical components: C, Si, Mn, Cr, Ni, Cu, Mo, and composite addition of Nb, V, Ti, Zr, B, Ca and RE. Through clean smelting, controlled rolling and controlled cooling and self tempering, fine-grained ferrite + granular bainite and spherical inclusions are obtained, so that the steel has high strength, low-temperature toughness at -40 DEG C, fire resistance and marine atmospheric corrosion resistance and long-term dimensional stability.

The present application relates to a kind of cold environment with atmospheric corrosion resistant bridge structure steel and its manufacturing method, wherein, by mass percentage, the chemical composition of the steel includes: C:0.05%~0.20%, Mn:0.90%~1.70%, Si:0.10%~0.80%, P:≤0.020%, S:≤0.015%, Al:0.015%~0.06%, Ca:0.001%~0.005%, and the balance of Fe and inevitable impurities.The steel of the present application realizes the stable high impact toughness of multiple strength grade steel plates in the thickness range of 6~150mm at-40℃~-70℃ low temperature under the premise of strictly controlling carbon equivalent (CEV) and welding crack sensitivity index (Pcm), while ensuring good welding performance, thickness direction performance, surface quality and atmospheric corrosion resistance.

This invention discloses a method for assessing the severity of atmospheric corrosion in marine environments, comprising the following steps: Step S1: Measuring key influencing factors that induce atmospheric corrosion of metals in the assessed environmental objects; Step S2: Integrating the measured influencing factors to obtain environmental parameters; Step S3: Calculating key parameters for different environmental objects based on the environmental parameters; Step S4: Calculating the equivalent corrosion severity value of the environmental objects based on the key parameters, and comparing the atmospheric corrosivity levels of different environmental objects. This method is applicable to assessing the severity of atmospheric corrosion in environments where temperature, humidity, and salt spray concentration are the main influencing factors, and can provide effective guidance for metal corrosion prediction and prevention.