63results about How to "Reduce corrosion rate" patented technology

The present application relates to a kind of corrosion liquid and macro etching method for low alloy ultra-high strength steel, the volume concentration of nitric acid in its corrosion liquid is (1.2+1.4*CE)% to (1.5+1.8*CE)%, the volume concentration of low carbon alcohol is 40%~50%;Acid fluorine salt mass concentration is (1.0+1.4*ASI)g / L to (1.4+1.8*ASI)g / L, the mass concentration of thiourea or its derivative is (0.5+1.5*HDI)g / L to (0.8+2.0*HDI)g / L;The balance is water;CE=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15, ASI=Nb+Ti+0.5* (V+Al), HDI=(C+Mn / 5+Cr / 3+Mo / 2+V / 2)*(1+Nb+Ti+B), above-mentioned element symbol is the mass percentage value of the element in the steel to be etched.The present application can solve the technical problems that the over-etching window of conventional etching liquid is difficult to control, weld and heat-affected zone is prone to over-etching, and corrosion duration control is seriously dependent on artificial experience, and the consistency of detection result is poor.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

The utility model relates to a maritime work mass concrete pile foundation anti-corrosion device which comprises an outer-layer protective shell, a middle-layer spacing shell and an inner-layer anti-corrosion shell, and the outer-layer protective shell, the middle-layer spacing shell and the inner-layer anti-corrosion shell are all cylindrical shells formed by assembling two semi-cylindrical shells. The inner-layer anti-corrosion shell, the middle-layer spacing shell and the outer-layer protection shell are sequentially arranged on the outer side of a concrete pile foundation in a sleeving mode from inside to outside, a first reaction cavity is formed between the outer-layer protection shell and the middle-layer spacing shell, and a second reaction cavity is formed between the inner-layer anti-corrosion shell and the middle-layer spacing shell. A plurality of first reaction rods are horizontally arranged on the middle-layer interval shell in an array mode, a plurality of second reaction rods are horizontally arranged on the inner-layer anti-corrosion shell in an array mode, and hydrophobic materials used for reducing the seawater permeation speed are clamped between the connecting pieces at the two ends of the two semi-cylindrical shells. And the anti-corrosion capability of the concrete pile foundation is obviously improved.

The invention relates to the technical field of ammonia synthesis, and discloses a low-consumption conversion ammonia-containing wastewater separation and treatment device which comprises an ammonia washing tower, a comprehensive flash evaporator, an alternating-current cooler, a stripping tower and a tail gas separation tank. The first ammonia washing tower and the second ammonia washing tower are arranged in parallel, bottom outlets are communicated to the comprehensive flash evaporator through a seventh adjusting valve and an eighth adjusting valve, high-pressure ammonia-containing condensate is throttled and depressurized, and physical turbulent flow is induced in the flash evaporator to accelerate desorption of acid gas. And the flash evaporation lower liquid enters the cold side of the alternating current cooler through a condensate pipeline, absorbs heat from a gas phase at the top of the stripping tower for preheating, and then enters the stripping tower for countercurrent deep stripping. Purified condensate generated at the bottom of the stripping tower is discharged out of the system, and a tower top gas phase is fed into a tail gas separation tank for gas-liquid separation after being subjected to heat exchange by an alternating-current cooler and cooling by a circulating water cooler. Through high-pressure flash evaporation pretreatment and an internal thermal coupling mechanism, the saturated steam consumption of a steam stripping section is reduced, and the problems of crystal blockage and equipment corrosion are solved.

The present application provides a kind of low load under coal mill outlet wind powder temperature regulating system and method, including temperature sensor group, flow sensor, coal dust concentration sensor, temperature regulating device and control unit, wherein: temperature sensor group is used to measure the wind powder temperature of different positions of coal mill outlet pipeline;Flow sensor is used to measure the wind powder flow of different positions of coal mill outlet pipeline;Coal dust concentration sensor is used to detect the coal dust concentration in the coal mill outlet pipeline;Temperature regulating device is used to adjust the wind powder temperature of coal mill outlet pipeline;Control unit is used to receive the signal of temperature sensor group, flow sensor, coal dust concentration sensor, calculate temperature regulating amount and output signal to temperature regulating device to the wind powder temperature of coal mill outlet.The present application ensures that the wind powder temperature of coal mill outlet is stable near the target value, improves the combustion efficiency, and ensures the stable operation of the entire thermal system.

The invention relates to the technical field of materials, in particular to a preparation method of a heat-resistant alloy thin plate for high-temperature molten salt energy storage. According to the specific technical scheme, the preparation method of the heat-resistant alloy thin plate for high-temperature molten salt energy storage comprises the steps that heat-resistant alloy and aluminum are smelted, hot rolling cogging at the temperature of 1200 DEG C is conducted after smelting, rolling with the deformation being 60% is conducted, and a hot-rolled plate is obtained; and the hot-rolled plate is subjected to solution treatment, water quenching, grinding and rolling, and then the high-aluminum heat-resisting alloy plate is obtained. Compared with nickel-based alloy, the novel alloy thin plate provided by the invention is low in price, excellent in mechanical property and outstanding in corrosion resistance.

The application belongs to the technical field of metal surface treatment, and particularly relates to an alkaline cleaning solution, a preparation method thereof, a formula optimization method and an alkaline cleaning method. Embodiments of the application abandon the formula system of high alkalinity and high phosphate in the prior art, and adopt a moderate alkalinity saponification degreasing-sodium gluconate chelation corrosion inhibition-trace amount of trisodium phosphate auxiliary-degreasing agent solubilization as a synergistic design idea to construct an alkaline cleaning solution formula which is suitable for the component characteristics of iron-chromium-aluminum alloy wire and the quality requirements of blue finished products. The formula enhances the wetting penetration and emulsification dispersion capacity by adding 4% to 10% of sodium hydroxide, 0.5% to 2.0% of sodium gluconate, 0.1% to 2% of trisodium phosphate and 0.1% to 2.0% of degreasing agent. The four components form a complete degreasing-corrosion inhibition synergistic system in the solvent system of water, and the dilemma of black spots due to incomplete degreasing and aluminum deficiency due to excessive degreasing in the alkaline cleaning process of iron-chromium-aluminum alloy wire blue finished products is solved.

This invention provides a method and apparatus for molten salt electrolysis to produce iron based on vacuum environment control, relating to the technical fields of metallurgy and electrochemistry. The method includes the following steps: S1, constructing an electrolysis system: iron-containing raw materials and flux are added to an electrolytic cell and heated to form a molten electrolyte; S2, vacuum environment control: the electrolysis reaction area is placed in a sealed vacuum environment, and the vacuum degree is adjusted to maintain the oxygen partial pressure in the anode area within a preset range; the preset range refers to the pressure range that enables the formation of a dense and constant-thickness passivation oxide film on the surface of the metal anode, while inhibiting the peeling off of the oxide film; S3, electrolytic reduction: while maintaining the vacuum environment after S2 control, a direct current or pulsed current is applied for electrolysis, the cathode is reduced to produce liquid iron, and oxygen is released at the anode; S4, product separation: the oxygen released at the anode in S3 is rapidly extracted using the vacuum pressure difference, and the liquid iron generated by the cathode reduction in S3 and the slag generated during the electrolytic reduction process are periodically discharged.

The utility model discloses a multi-section variable diameter methanol removal distillation tower, and particularly relates to the technical field of methanol distillation towers, the multi-section variable diameter methanol removal distillation tower comprises a supporting assembly, a distillation assembly is fixedly connected to an inner cavity of the supporting assembly, a cooling assembly is fixedly connected to the upper part of the distillation assembly, and a separation assembly is fixedly connected to the left part of the cooling assembly. The lower portion of the separation assembly is fixedly connected with a slag prevention assembly, and the right portion of the supporting assembly is fixedly connected with a heating assembly. According to the multi-section variable-diameter methanol removal distillation tower disclosed by the utility model, the separation of methanol liquid and gas can be realized through the designed separation assembly, the cooled waste gas possibly still contains uncondensed methanol steam or tiny liquid drops, and the uncondensed methanol steam or tiny liquid drops are blown back into the distillation tower through the fan, so that the uncondensed methanol steam or tiny liquid drops can participate in the gas-liquid mass transfer process again and are further separated and recycled; meanwhile, heat carried in the waste gas returns to the tower along with the gas flow, and the heat can partially replace the heating load of the reboiler.

This invention provides a medium-oxygen weathering steel and its preparation method, belonging to the field of weathering steel production technology. The chemical composition of the medium-oxygen weathering steel includes: C, Si, Mn, P, S, Cr, Cu, Ni, O, and Fe; by mass fraction, the content of C is 0.08%–0.10%, the content of Si is 0.30%–0.50%, the content of Mn is 0.50%–0.65%, the content of P is 0.08%–0.10%, the content of S is ≤0.005%, the content of Cr is 0.40%–0.55%, the content of Cu is 0.30%–0.45%, the content of Ni is 0.10%–0.40%, and the content of O is 0.005%–0.012%. The oxygen content is increased from below 0.003% in ordinary weathering steel to the range of 0.005-0.012%, resulting in silicate inclusions that are more stable and less prone to corrosion. Furthermore, some silicon-manganese-aluminum oxides form composite inclusions with MnS, causing the MnS inclusions to change from long strips to short strips, thus inhibiting corrosion propagation. As a result, the corrosion rate of medium-oxygen weathering steel is reduced by more than 18%, making it suitable for more severe corrosive environments and solving the problem of poor corrosion resistance of ordinary weathering steel in current technologies.

This invention discloses an ultra-fine circuit stripping solution and its preparation method, belonging to the field of printed circuit boards. The ultra-fine circuit stripping solution is characterized by comprising a composite alkali, a corrosion inhibitor, an additive, a surfactant, and a solvent. This invention also provides its preparation method. Compared with existing technologies, the ultra-fine circuit stripping solution prepared by this invention achieves rapid, complete, and selective stripping of high-density fine circuit films by virtue of the efficient bond-breaking ability provided by the composite alkali, the synergistic metal protection of the corrosion inhibitor, the penetration and stripping assistance provided by the surfactant and additive, and the safety and environmental advantages brought by the green solvent system.

This utility model discloses a dust collection device for busbar cutting, comprising: a support member, a magnetic suction member, and a collection assembly; the support member has a through hole, and the support member is sleeved on the busbar through the through hole; the support member has an annular groove surrounding the busbar and opening towards the end of the busbar; the magnetic suction member is installed on the support member located on the back of the annular groove, magnetically attracting dust into the annular groove; the collection assembly is installed below the support member and communicates with the annular groove. This reduces the splashing of iron filings and dust, improves safety, and provides a certain degree of protection for the surrounding environment and personnel. It also reduces the penetration of iron filings and dust deep into the busbar, lowers the difficulty of cleaning, and reduces labor intensity. Furthermore, it prevents splashed iron filings from damaging the busbar, maintaining a good appearance for the busbar, reducing the rate of corrosion caused by impurities, and extending its service life.

This utility model discloses a portable desalination device for metallic artifacts, belonging to the field of cultural relic protection technology. It includes a mobile frame with casters fixed to the bottom via spring shock absorbers. A desalination assembly is located on the top of the frame, comprising a desalination chamber, a lid, partition grooves, partition plates, threaded grooves, several connecting rods, and clamps. The desalination assembly, with its cross-shaped partition grooves and snap-fit ​​partition plates within the desalination chamber, allows for flexible adjustment of the internal space dimensions, adapting to metallic artifacts of different sizes and volumes, significantly improving the device's adaptability. Furthermore, the connecting rods mounted via the threaded grooves flexibly secure the clamps and a waterproof camera. The monitoring sensor probe within the clamps can acquire multi-dimensional data at different depths of the solution in real time, while the waterproof camera simultaneously records the artifact's condition, eliminating reliance on manual sampling and enriching parameter monitoring methods.

The invention belongs to the technical field of corrosion prevention, and particularly relates to environment-friendly anticorrosive paint and a preparation method thereof. According to the environment-friendly anticorrosive paint provided by the invention, the corrosion inhibitor loaded by Ce-MOF can play a good barrier effect in the paint, the corrosion inhibitor can be released in time when later corrosion occurs, an active anticorrosive function is achieved, and the corrosion inhibitor can be well dispersed into the paint through L-cysteine modified boron nitride, so that the corrosion resistance of the paint is improved, and the corrosion resistance of the paint is improved. L-cysteine can reduce the rate of metal corrosion and can play a role in protection, boron nitride can play a very good barrier effect, through cooperation of the components, a very good anti-corrosion effect of the paint can be achieved, and the prepared environment-friendly anti-corrosion paint is good in anti-corrosion performance and wide in application.

The invention relates to the technical field of permanent magnet preparation, and particularly discloses a high-temperature-resistant neodymium-iron-boron magnet and a preparation method thereof. The high-temperature-resistant neodymium-iron-boron magnet comprises the following elements in percentage by mass: 17.4%-19.5% of Nd, 0.66%-0.72% of B, 38.37%-41.19% of Fe, 0.36%-4.8% of Dy, 0.18%-0.3% of Nb, 0.18%-0.3% of Al, 0.03%-0.09% of Cu, 29.1%-34.8% of an alloy rapid hardening sheet and the balance of unremovable impurities, wherein the alloy rapid hardening sheet contains Pr, Tb, Bi and Sn; the preparation method comprises the following steps: grinding the surface of an alloy rapid hardening sheet to be bright, mixing the alloy rapid hardening sheet with a pretreated magnet block, adding zirconium oxide balls, putting into a reaction kettle of a rotary diffusion furnace, vacuumizing the reaction kettle, introducing argon, rotating at the rotating speed of 4-6r / min, keeping the temperature at 700-704 DEG C for 3-7h, and carrying out rotary diffusion, so as to obtain the zirconium oxide-based composite material. And then carrying out heat preservation at 850-950 DEG C for 2-4 hours for high-temperature diffusion and heat preservation at 450-550 DEG C for 2-4 hours for tempering heat treatment by using a vacuum tube furnace in a vacuum environment. The high-temperature-resistant neodymium-iron-boron magnet has the advantage that the defect that heat resistance of a conventional neodymium-iron-boron magnet is still insufficient is overcome.

The utility model discloses a rust-proof vacuum pug mill which comprises a base, a lower shell is arranged on the base, an upper shell is arranged on the lower shell, fixing plates are connected to the outer sides of the upper shell and the lower shell, clamping sleeves are arranged on the fixing plates, clamping rods are arranged on the inner sides of the clamping sleeves, locking sleeves are arranged on the outer sides of the clamping sleeves, and the locking sleeves are movably arranged on the outer sides of the clamping sleeves through threads. The outer side of the clamping sleeve is sleeved with a releasing sleeve, a locking frame is arranged on one side of the releasing sleeve, a releasing groove is formed in the inner side of the releasing sleeve in a reducing mode, a locking groove is formed in the outer wall of the clamping sleeve, a locking rod is arranged in the locking frame, a releasing plate is arranged in the releasing groove, a clamping block is arranged on one side of the releasing plate, a containing groove is formed in the outer side of the clamping rod, and a rotating shaft is arranged in the containing groove. According to the utility model, the convenient disassembly and assembly between the upper shell and the lower shell are realized, the connection stability of the upper shell and the lower shell is ensured, and the stable use of equipment is ensured.

The invention discloses a modified current collector and a preparation method and device thereof, a pole piece and a solid-state battery, the modified current collector comprises a base material layer, the base material layer comprises a metal foil and a protective layer located on at least one side of the base material layer, the protective layer comprises at least one protective unit, and the protective unit comprises a first layer and a second layer which are stacked in the direction away from the base material layer, the first layer includes TiN and the second layer includes stainless steel. And the TiN and the stainless steel are combined to form the protective layer or the protective unit, so that the modified current collector has excellent corrosion resistance and excellent conductivity and mechanical properties.

This invention relates to a modular, anti-siltation bottom aquaculture device. The device includes an aquaculture module and an anti-siltation module. The aquaculture module has a cubic frame structure, within which several shellfish aquaculture cages or ropes are installed. The anti-siltation module includes several flip-up plates spaced apart on the lower plane of the cubic frame structure of the aquaculture module. This invention can be customized to suit the seabed characteristics of different sea areas, and each device is an independent aquaculture space, facilitating processing, transportation, assembly, and deployment. It is highly practical and effectively reduces labor and transportation costs. The anti-siltation module has a simple structure and can freely switch between deployment and harvesting states, effectively solving the siltation problem in bottom aquaculture. To increase service life, an anti-corrosion module can be added, fixing sacrificial anodes to the aquaculture module. This invention significantly reduces aquaculture costs and enables large-scale, green, and ecological shellfish aquaculture in bottom sea areas, demonstrating strong applicability and economic viability.

This invention discloses a low-voltage, high-current electrolytic hydrogen production power supply system and control method based on a SiC and IGBT hybrid half-bridge, belonging to the field of electrolytic hydrogen production technology. The system includes: a hybrid half-bridge power module, used to convert the bus voltage into the total system output voltage and output IGBT branch current and SiC branch current under the control of a drive signal; a drive and isolation module, connected between the digital control and sampling module and the hybrid half-bridge power module, used to generate a drive signal based on a PWM signal and send the drive signal to the hybrid half-bridge power module; and a digital control and sampling module, used to sample key state variables of the system, calculate the PWM signal based on the key state variables, and send the PWM signal to the drive and isolation module. This invention compensates for the ripple of the low-frequency IGBT branch in real time through the high-frequency SiC branch, avoiding the problem of temporary ripple increase in traditional hybrid topologies during transients.

This application relates to the field of etching solution technology, specifically disclosing a BOE etching solution and its preparation method. The BOE etching solution comprises the following raw materials: hydrofluoric acid, ammonium fluoride, a metal corrosion inhibitor, a composite buffer regulator, perfluorobutyl polyoxyethylene ether, and ultrapure water; the metal corrosion inhibitor is a complex of benzotriazole-imidazolium-grafted polyethyleneimine and aminotrimethylenephosphonic acid; the composite buffer regulator includes ammonium hydrogen fluoride, boric acid, and amino acids. The BOE etching solution of this application can be used in back-end metal wiring processes such as integrated circuits, MEMS devices, and 3D NAND, and is particularly suitable for etching silicon dioxide containing tungsten, aluminum, and titanium metals. It features high etching rate, low metal corrosion, and excellent metal surface protection, effectively solving the technical pain points of existing BOE etching solutions, such as severe metal corrosion and difficulty in simultaneously achieving etching and protection.

The application relates to the technical field of graphene, and discloses a fluorinated graphene modified polytetrafluoroethylene composite material and a preparation method, the composite material comprising: polytetrafluoroethylene as a base; fluorinated graphene uniformly dispersed in the base; and the following additives, the total content of the additives being 1% to 10% of the total weight of the composite material: nano silicon dioxide, carbon nanotubes, glass fibers, long-chain alkyl amine; the tensile strength of the composite material of the application is increased by at least 20% compared with pure PTFE, the elongation at break of the composite material is increased by at least 15% compared with pure PTFE, and through the use of specific solvents (dimethyl sulfoxide or water) and ultrasonic treatment, the uniform dispersion of the fluorinated graphene and other additives in the PTFE base is ensured, the agglomeration phenomenon is reduced, and the compactness and mechanical properties of the composite material are improved.

The invention discloses low-C-high-Mn-Ni-Cu corrosion-resistant L555-grade subsea pipeline steel and a preparation method thereof, belongs to the technical field of subsea pipeline steel manufacturing, and aims to solve the technical problem that existing L555-grade pipeline steel is poor in corrosion resistance and low-temperature toughness. The low-C high-Mn-Ni-Cu corrosion-resistant L555-grade subsea pipeline steel provided by the invention is prepared from the following components in percentage by mass: 0.031 to 0.045 percent of C, 2.00 to 2.10 percent of Mn, 0.15 to 0.22 percent of Si, 0.60 to 0.80 percent of Ni, 0.31 to 0.40 percent of Cu, 0.15 to 0.20 percent of Cr, 0.020 to 0.030 percent of Nb, 0.010 to 0.015 percent of Ti, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.004 percent of N and the balance of Fe and inevitable impurities. The L555-grade subsea pipeline steel provided by the invention has good corrosion resistance and low-temperature toughness, and is suitable for deepwater drilling riser main pipes and other pressure-bearing service components.

This utility model relates to the field of lower chord pipe technology and discloses a lower chord pipe fixing device, including a lower chord pipe fixing frame. The top of the lower chord pipe fixing frame is fixedly connected to a first steel cable ring, and a fixing steel wire is movably sleeved inside the first steel cable ring. A drainage slot is opened at the top of the lower chord pipe fixing frame, and a lower chord pipe fixing ring is fixedly connected to the bottom of the drainage slot. The lower chord pipe is movably sleeved inside the lower chord pipe fixing ring, and a fixing connecting frame is fixedly connected to the top of the lower chord pipe fixing frame. This utility model uses a drainage slot opened on the outside of the fixing frame at an inclined angle of 15° to quickly drain rainwater or condensate accumulated at the top, preventing water stains from forming liquid at the connection between the fixing frame and the lower chord pipe. This reduces the corrosion rate of metal parts, ensures the long-term stable fitting accuracy of the lower chord pipe fixing ring and the lower chord pipe, avoids loosening or jamming caused by corrosion, and further ensures the structural reliability of the equipment.

The application discloses a through water super-large square coefficient breeding work ship floating type power positioning device and belongs to the technical field of ship equipment. The device comprises a through water channel arranged in the ship body, a middle constant pitch propeller arranged near the tail outlet of the through water channel, two first anchor chains arranged at the front part of the ship body, one second anchor chain arranged at the rear part of the ship body, two side thrust electric thrusters arranged at the two sides of the front part of the ship body, a fixed plate fixed in the ship body, a storage box fixed on the bottom surface of the fixed plate, two storage boxes arranged in mirror image about the vertical center line of the fixed plate, the storage box being connected to the bottom of the ship body, two supporting plates fixed on the top surface of the fixed plate, and a connecting plate connected between the top side walls of the two supporting plates. The device is combined by the side thrust, the full rotation propeller, the constant pitch propeller and the anchor chain, realizes the three mode switching of the transfer, the normal breeding and the extreme working condition, adapts to different sea condition requirements, and improves the positioning precision and stability of the ship body.

The application discloses a kind of based on porous super-hydrophobic material ventilation air film layer drag reduction device, method and ship, belong to air film drag reduction technical field;Device includes drag reduction component, gas supply module, data acquisition module and control module, drag reduction component includes porous super-hydrophobic plate and the non-porous material super-hydrophobic plate located downstream thereof;The porous super-hydrophobic plate is built-in with several air injection hole air passage, the air inlet of air passage is communicated with gas supply module, gas is ejected from air injection hole by air passage, then it is output to its outer wall surface by the small air hole of porous super-hydrophobic plate, and stable air film layer is formed by flowing through downstream non-porous material super-hydrophobic plate;Data acquisition module transmits collected data to control module, and control module judges whether air film meets requirements according to each data, and if not satisfied, corresponding gas supply amount is adjusted.The application solves the problem that uniform ventilation of the whole ship body is difficult to realize due to external water pressure in the prior art;Meanwhile, the injection rate is regulated.

This application relates to a corrosion inhibitor and its preparation method for circulating water in coastal high-chlorine environments of steel plants, belonging to the technical field of circulating water treatment and corrosion inhibitors. The chemical composition of the corrosion inhibitor, by mass fraction, includes: imidazoline corrosion inhibitor: 20%~23%, azole corrosion inhibitor: 15%~18%, surfactant: 7%~10%, halogen promoter: 1%~3%, zinc salt: 1%~3%, biomass-based scale inhibitor: 1%~5%, bactericide: 1%~5%, defoamer ≤3%, and water: 30%~54%. Through the synergistic effect of its components, the corrosion inhibitor can form a dense and stable composite protective film on the carbon steel surface, effectively blocking the electrochemical corrosion of the steel matrix by chloride ions in a high-chlorine environment, and maintaining structural stability at high temperatures. This corrosion inhibitor also possesses excellent scale inhibition performance and environmental friendliness. The preparation process of the corrosion inhibitor is simple and cost-controllable, which can significantly extend the service life of key equipment in the circulating water system of steel plants in coastal high-chlorine environments, reduce maintenance costs, and ensure long-term stable operation of the system.

The utility model discloses an automatic ammonia preparation device for adding ammonia water into condensed water in a multi-point manner, and belongs to the technical field of industrial water treatment. Comprising an ammonia preparation unit, a multi-path adding unit and a control unit, the ammonia preparation unit comprises an ammonia water storage tank, a desalted water tank, a mixing and diluting tank, a first metering pump, a second metering pump and an online conductivity meter; the ammonia preparation unit is used for mixing ammonia water and desalted water in proportion; the multi-path adding unit comprises a main distribution pipeline and at least three parallel adding branches, each adding branch is communicated with a regulating valve, a flow meter and a static mixer, and the multi-path adding unit is used for adding mixed ammonia water to a plurality of adding points of the condensed water system; the control unit comprises a PLC (Programmable Logic Controller) and a pH sensor, the pH sensor is used for monitoring the pH value of condensed water at each feeding point, the PLC is in signal connection with the pH sensor, the online conductivity meter, the regulating valve and the flow meter, and the control unit is used for realizing dynamic flow distribution.

According to the composite corrosion inhibitor etching liquid and the preparation method and application thereof, a composite corrosion inhibition system composed of the first corrosion inhibitor and the second corrosion inhibitor is introduced into an acid etching system, and selective removal of a copper seed layer under different etching conditions is achieved; according to the composite corrosion inhibition system, the corrosion defect of the surface of a copper electrode can be remarkably reduced, the surface appearance can be improved, the lateral corrosion depth can be reduced, and meanwhile complete etching of a residual copper seed layer in a non-electrode area is not affected. The two types of nitrogen-containing heterocyclic corrosion inhibitors generate a synergistic adsorption effect on the copper surface by utilizing the molecular structure and adsorption behavior difference to form a compact and stable composite protection layer, so that the synergistic regulation and control on the overall corrosion rate and the local lateral corrosion behavior are realized. The composite corrosion inhibitor etching liquid has the advantages of being good in etching uniformity, remarkable in lateral erosion inhibition effect, wide in process window and suitable for industrial application.

This invention belongs to the field of marine pipeline welding technology and discloses a method for welding galvanized sleeves. This method involves prefabricating and welding a first pipe body and a first sleeve, as well as a second pipe body and a second sleeve, and then galvanizing the entire assembly. The galvanized layer is not damaged by the high-temperature welding. The double-sided prefabrication and welding of the stainless steel sleeve and carbon steel pipe before galvanizing ensures that the inner ends of the first and second pipe bodies are sealed with welds after closure. This prevents the flowing medium from easily entering the surrounding gaps. The sealed inner ends and the galvanized layer significantly improve resistance to corrosion, extending service life and reducing corrosion rate. While achieving high welding efficiency, this indirectly extends the service life of related equipment. Furthermore, during pre-assembly in the ship section stages, the connecting sleeve and the second sleeve are appropriately recessed into their respective sections to prevent contact and collision during the closure and hoisting of the ship sections, thus improving the construction efficiency of the ship section closure and hoisting.

The application relates to a low-corrosion chip photoresist cleaning agent and a preparation method and application thereof, wherein the low-corrosion chip photoresist cleaning agent comprises the following components according to weight parts: 3-15 parts of organic strong base; 10-30 parts of alcohol amine; 0.05-10 parts of corrosion inhibitor; 20-45 parts of polar solvent; 0.1-16 parts of water-retaining agent; and 30-50 parts of ultrapure water. The application uses two kinds of compound corrosion inhibitors of polyaspartic acid and sodium metatungstate, and the polyaspartic acid and the sodium metatungstate not only can protect the metal and the substrate from corrosion alone, but also can synergistically improve the metal protection capacity.