327 results about "Acid corrosion" patented technology

The invention relates to the technical field of high polymer materials, and provides an anti-aging cable and a preparation method thereof. The anti-aging cable comprises a conductor and a sheath layer, the sheath layer is prepared from the following raw materials in parts by weight: 40 to 60 parts of ethylene propylene diene monomer, 20 to 30 parts of ethylene-vinyl acetate copolymer, 20 to 22 parts of nano cellulose / montmorillonite composite material, 5 to 10 parts of nano silicon dioxide, 10 to 20 parts of magnesium hydroxide, 5 to 8 parts of zinc borate, 1.5 to 3 parts of composite antioxidant, 0.5 to 1.5 parts of ultraviolet light absorber, 1 to 1.2 parts of anti-aging agent and 1 to 2 parts of silane coupling agent. And 0.3 to 0.5 part of maleic anhydride grafted polypropylene. According to the anti-aging cable prepared in the invention, the high temperature resistance and the acid corrosion resistance of the anti-aging cable are improved, and the aging of the cable is effectively delayed.

The invention discloses a positive electrode material and a secondary battery, and belongs to the technical field of batteries, the material is characterized in that a coating layer is arranged on the surface of a positive electrode active substance, and meanwhile, the roundness of the coated positive electrode material and the ratio relation of the content ratio of free transition metal ions after the acid corrosion effect are regulated and controlled; the balance of the stability and the conductivity in the positive electrode material is coordinated, so that the secondary battery prepared from the positive electrode material has ideal electrochemical performance, and particularly has relatively excellent cycling stability and storage capacity retention rate in a high-temperature environment.

The present invention relates to the field of metal corrosion and protection, and specifically to a preparation method and application of a modified chitosan Schiff base corrosion inhibitor. The preparation method comprises six steps: (1) preparing a gel-like chitosan dispersion; (2) preparing an ethanol solution of 2,6-dimethyl-5-heptenal; (3) adding the gel-like chitosan dispersion; (4) adding the ethanol solution of 2,6-dimethyl-5-heptenal and conducting a Schiff base reaction; (5) rotary evaporation and dehydration of the reaction product; and (6) washing, filtering, and drying. The present invention utilizes 2,6-dimethyl-5-heptenal, a common food additive, as a modifier to condense with natural polymer chitosan to prepare an acid corrosion-resistant corrosion inhibitor, with a simple process and low production cost. The invention is applied to N80 steel sheets in a hydrochloric acid medium for corrosion protection, uses a low concentration, and effectively improves the corrosion inhibition rate of the corrosion inhibitor on metals. The invention is a green, environmentally friendly, economical, and efficient corrosion inhibitor with good promotion prospects.

The invention relates to the technical field of refractory materials, and discloses a rotary kiln lining refractory material and a preparation method thereof, the raw materials comprise mullite, boron carbide, calcium hexaluminate, silicon carbide, silica powder, alpha-alumina micro powder, coating powder, modified refractory fiber, and a binder. The mullite and the boron carbide are selected as base materials and have excellent acid corrosion resistance, the titanium dioxide and the aluminum oxide are used for treating the refractory fibers, so that a compact enrichment layer is formed, low-temperature sintering is promoted by adding the yttrium oxide, the titanium dioxide is introduced into the refractory fibers, and the corrosion resistance of the refractory fibers is improved. And micropores in the fiber surface can be blocked, so that the porosity of the refractory material is reduced, and the diffusion path of acid steam is prolonged. The refractory material provided by the invention has excellent high-temperature stability and corrosion resistance.

The invention relates to the technical field of floating cables, and provides a waterproof corrosion-resistant floating cable which comprises a conductor, an insulating layer, a foaming layer and a sheath layer from inside to outside. The sheath layer comprises the following raw material components in parts by mass: 90-110 parts of a styrene-butadiene-styrene block copolymer, 60-80 parts of polypropylene, 80-90 parts of white oil, 15-25 parts of a filler, 2-3 parts of an antioxidant, 1-2 parts of a compatilizer and 1-3 parts of a dispersant; the filling agent is composite calcium carbonate; the preparation method of the composite calcium carbonate comprises the following steps: A1, adding calcium carbonate into an alkaline solution, and uniformly mixing to obtain a mixed solution; a2, adding magnesium chloride and aluminum chloride into water, and mixing to obtain a metal salt mixed solution; and A3, adding the metal salt mixed solution into the mixed solution, stirring, centrifuging, washing and drying to obtain the composite calcium carbonate. According to the technical scheme, the problem of poor acid corrosion resistance of the waterproof floating cable in the prior art is solved.

The invention discloses a halogen-free low-volatility anti-icing photo-thermal super-hydrophobic coating for the surface of a wind power blade and a preparation method thereof. The coating is prepared by compounding functionalized modified multi-walled carbon nanotubes, functionalized modified nano titanium nitride, polydimethylsiloxane / nano silicon dioxide modified epoxy resin and a curing agent. Wherein the multi-walled carbon nanotubes are subjected to amidation and dual functionalization of lauric acid and 3-aminopropyl triethoxy silane; the surface of the nano titanium nitride is uniformly modified through bionic polydopamine coating; hydroxyl-terminated polydimethylsiloxane and nano SiO are doped into an epoxy resin base material, so that the system is endowed with low surface energy and high weather-resistant binding force. After curing and film forming at room temperature for 24 hours or at 80 DEG C for 2 hours, the water contact angle is greater than or equal to 155 DEG C, the ice adhesion strength is less than or equal to 10 kPa, the photo-thermal temperature is greater than or equal to 40 DEG C, and the performance is not attenuated after 50 times of heating and cooling tests; and after 150-hour damp heat, 500-hour ultraviolet radiation, acid corrosion and abrasive paper friction, the coating does not blister or fall off. The coating disclosed by the invention is green and environment-friendly, low in curing energy consumption, high in photo-thermal temperature rise and strong in super-hydrophobic durability, and can be used for remarkably improving the long-term anti-icing capability of wind power blades in cold and high-humidity regions.

The utility model discloses a catalytic hydrogenation reactor for treating a biomass raw material with a high acid value and a high iodine value, and belongs to the technical field of oil product hydrogenation. The catalytic hydrogenation reactor comprises a reactor pressure-bearing container, an inner cylinder, an ash discharge port, a feeding assembly, a reaction assembly and a discharging assembly, the inner cylinder is arranged in the reactor pressure-bearing container, the feeding assembly and the reaction assembly are arranged in the inner cylinder, the reaction assembly comprises a ceramic tube bundle internal part, the discharging assembly is arranged above the inner cylinder, and the discharging assembly is arranged above the inner cylinder. The ash discharge port is formed in the center of the bottom of the reactor pressure-bearing container. By arranging the ceramic tube bundle internal part in the catalytic hydrogenation reactor, on one hand, the ceramic tube bundle internal part serves as a reaction assembly and has certain acid corrosion resistance, and on the other hand, the ceramic tube bundle internal part serves as a solid catalyst carrier, selective hydrogenation of high-acid-value and high-iodine-value biomass raw materials is achieved, the iodine value is effectively reduced, and coking of the high-iodine-value biomass raw materials in the reaction process is avoided; in addition, the acid value is maintained as far as possible while the iodine value is reduced, and the solid catalyst and the catalytic hydrogenation reactor are not corroded, so that the stability of the solid catalyst and the yield of the product are improved.

The invention discloses a cable resistant to high temperature and acid corrosion, and the cable comprises a conductor layer which is formed by concentrically twisting a plurality of nickel-coated copper wires; the inner insulating layer coats the conductor layer and is used for improving the thermal conductivity of the cable; the outer insulating layer is sleeved on the inner insulating layer; the anti-bending buffer layer is coated outside the outer insulating layer; the electromagnetic shielding layer wraps the anti-bending buffer layer and is used for forming a shielding layer; the electromagnetic shielding layer is coated with the anti-corrosion functional layer, the anti-corrosion functional layer is a fluororubber belt, and benzotriazole corrosion inhibition microcapsules are embedded in a rubber layer of the fluororubber belt; and the mechanical strengthening layer is arranged outside the anti-corrosion functional layer in a sleeving manner. According to the invention, the conductor layer adopts the nickel-coated copper wire to improve the high-temperature-resistant conductivity, the corrosion inhibition microcapsules are embedded in the corrosion-resistant functional layer to realize long-acting corrosion resistance, the electromagnetic shielding layer is combined with graphene and the tinned copper strip to enhance the broadband shielding effectiveness, and the cable has long-acting corrosion resistance, mechanical property stability in a high-temperature environment and broadband electromagnetic shielding effectiveness.

The invention discloses a method for preparing an upper electrode of a gallium arsenide solar cell for a low-cost space, which comprises the following steps of: corroding a gallium arsenide epitaxial wafer taking germanium as a substrate in a mixed acid corrosion solution, removing an oxide layer and pollutants on the surface of the epitaxial wafer, taking out the epitaxial wafer, and cleaning the epitaxial wafer in deionized water; the surface of the active layer of the epitaxial wafer is tightly attached to the metal grid mesh, the epitaxial wafer is put into vacuum evaporation equipment, electrode metal is evaporated layer by layer in an electron beam evaporation mode, and after evaporation is completed, the epitaxial wafer is taken out from the vacuum evaporation equipment when the epitaxial wafer is cooled to 100 DEG C or below; and placing in a vacuum sintering furnace, heating at a constant temperature for a period of time, cooling to below 100 DEG C, and taking out to obtain the space gallium arsenide solar cell top electrode. A traditional photoetching process is replaced by a metal grid mesh, the surface of an active layer of an epitaxial wafer is tightly attached to the metal grid mesh, and then the epitaxial wafer is put into a vacuum coating machine to be subjected to metal evaporation. And the evaporated metal is deposited on the surface of the epitaxial wafer through gaps of the grid mesh to prepare a conductive upper electrode.

The invention belongs to the field of soil remediation materials, and particularly relates to a humic acid composite remediation material for a coal chemical industry polluted site and a preparation method of the humic acid composite remediation material. The method comprises the following steps: 1) uniformly mixing raw materials, alkali liquor and phosphide, standing, taking supernate, adding acid liquor to adjust the pH value of a system, and performing suction filtration to obtain a humic acid solution; 2) drying the solid obtained by the standing operation in the step 1), adding an acid solution, uniformly mixing, filtering, cleaning, adding a strong acid for corrosion, filtering again, cleaning, and drying to obtain a base material; and (3) heating the organic raw material, the emulsifier and the solvent, adding the mixed solution of the acyclic carboxylic acid and the humic acid solution while keeping stirring, adding the initiator, performing thermal reaction, adding the base material while being hot, uniformly mixing, drying and grinding to obtain the humic acid composite repair material. The humic acid composite remediation material can effectively improve the structure and quality of soil and effectively improve the soil remediation efficiency.

The invention discloses a preparation process of carboxylated shell-based activated carbon for organic matter adsorption, and particularly relates to the technical field of adsorption materials, and the preparation process comprises the following steps: mixing coconut shell powder and walnut shell powder, crushing, and loading potassium hydroxide in stages in a gradient manner; carrying out two-stage microwave activation in an inert atmosphere, namely low-temperature pre-activation in the first stage and high-temperature activation in the second stage, and introducing carbon dioxide; the activated product, phosphoric acid, a laccase-peroxidase complex enzyme preparation and a buffer solution are subjected to ultrasonic synergistic modification, and then a weak acid reaction is maintained through dynamic pH regulation and control; and finally, performing graded washing and gradient drying to obtain a finished product. According to the method, high-density carboxyl grafting and graded pore construction are synchronously realized under mild conditions through a synergistic effect of directional catalysis of biological enzyme and dynamic regulation of microwave, so that the problems of structural damage caused by strong acid corrosion, pore imbalance caused by fixed parameters and stability reduction caused by insufficient post-treatment in a traditional process are solved; the adsorption performance and the regeneration cycle performance of the material are also obviously improved.

The invention relates to the field of resin coatings, and particularly discloses a coating containing a resin composition as well as a preparation method and application of the coating. The coating containing the resin composition is prepared from the following raw materials: the resin composition, a curing agent and an auxiliary material mixture, and the weight ratio of the resin composition to the curing agent to the auxiliary material mixture is 100: (30-50): (50-150). Wherein the resin composition is formed by compounding triglycidyl isocyanurate, bisphenol F type episulfide resin and tetraglycidyl amine type epoxy resin. The preparation method comprises the following steps: respectively adding the auxiliary material mixture into the resin composition and the curing agent according to a certain ratio, uniformly mixing, and then mixing to finally obtain the coating containing the resin composition, the test shows that the coating has good bonding strength, high temperature resistance, acid corrosion resistance, rapid cooling resistance and rapid heating performance, the surface drying time meets the construction requirement, and the coating has good application prospects. The coating can be applied to the inner wall coating of the wet desulphurization chimney.

The specific embodiment of the invention provides an anti-rust coating and a coating, the anti-rust coating comprises a water-based rust conversion agent and a water-based epoxy coating, the water-based rust conversion agent comprises a water-based acrylic emulsion and ammonium polyacrylate salt, the pH value of the water-based rust conversion agent is 6-8, Fe < 3 + > is converted into a stable complex in situ through a carboxyl chelation reaction, and the stable complex is added into the water-based epoxy coating. The water-based rust conversion agent and the epoxy coating have the advantages that the water-based rust conversion agent is added into the water-based epoxy coating, the continuous acid etching risk of a matrix is avoided, the water-based epoxy coating comprises polydopamine grafted and coated silicon dioxide, micropores can be reduced by the coating, permeation of water, oxygen and chloride ions can be inhibited, hydrolytic stripping and secondary corrosion can be prevented, and the water-based rust conversion agent and the epoxy coating have good compatibility; the formed coating is excellent in interlayer adhesive force and compact and firm in film layer, and the long-acting protection requirement in a severe corrosion environment can be met when the anti-rust coating is used for coating corrosion prevention of a steel member.

The invention discloses a pulse copper plating process with low TOC and high deep plating capacity. The pulse copper plating process comprises the following steps that 1, pretreatment is conducted, specifically, a substrate is subjected to cleaning, oil removing and acid etching rust removing treatment; 2, surface treatment: treating the surface of the substrate by using a treating agent; thirdly, acid copper sulfate copper plating is conducted, specifically, the treated substrate is placed in a copper plating tank, and electroplating is conducted through a copper electroplating solution of high-purity copper sulfate with the purity being 99.8%; 4, post-treatment is conducted, specifically, the copper-plated substrate is cleaned and dried; step 5, inspection: performing external inspection and performance inspection on the dried substrate; by adding the electroplating liquid, reducing the bath changing frequency and reducing the sewage treatment capacity, the production cost is reduced, the pollution to the environment is greatly reduced, and the production cost of an enterprise is reduced; tOC is low under the same load condition, the cylinder changing frequency is reduced, and wastewater discharge is reduced; meanwhile, due to low TOC, the service life of the additive can be doubled, and the production cost is reduced.

The invention provides a preparation method of a back contact heterojunction solar cell. The method comprises the following steps of: after polishing and cleaning two surfaces of a silicon wafer, sequentially depositing a passivation layer i, a doping layer n, a silicon nitride isolation layer and a sacrificial layer on the back surface; the sacrificial layer pattern is etched through picosecond laser, and the doping layer n layer is exposed through HF acid corrosion; synchronously etching a passivation layer i and a doping layer n in a back opening region by adopting alkali liquor, and performing front texturing; a passivation layer i and a doping layer p are secondarily deposited on the back surface, a doping layer n is secondarily exposed through HF acid after a P region pattern is etched through laser, a passivation layer i and an anti-reflection layer are deposited on the front surface, a TCO transparent conductive layer is deposited on the back surface, a P / N region electrode is subjected to silk-screen printing and light injection curing, and finally a P / N region is isolated through laser. According to the method, the rear texturing process is combined with the laser and wet etching, so that the front film layer is prevented from being corroded by the wet method, the process is simplified, the cost is reduced, and high-efficiency and low-damage industrial mass production is realized.

The invention discloses magnesium phosphate cement paste based on low-temperature calcined phosphate tailings and a preparation method of the magnesium phosphate cement paste, and relates to the technical field of magnesium phosphate cement materials. Uniformly mixing soluble phosphate, low-temperature calcined phosphate tailings, light calcined magnesia and a delayed coagulation substance to obtain a mixed dry material; adding the calculated water reducing agent into water, and fully and uniformly mixing for later use; the mixed dry material and the water reducing agent mixed solution are mixed, magnesium phosphate cement paste is obtained, the dry material mixing time is not less than 1 min, and the stirring time is not less than 150 s when the mixed solution is added. The phosphate tailings are used for replacing dead-burnt magnesium oxide, so that a large amount of consumption of the existing accumulated phosphate tailings can be realized, the value of the phosphate tailings is improved, effective elements in the phosphate tailings are fully utilized, cyclic utilization of resources is realized, meanwhile, the manufacturing cost of the magnesium phosphate cement can be remarkably reduced, and impurities such as silicon and aluminum in the phosphate tailings possibly form a compact structure; the acid corrosion resistance and the salt corrosion resistance of MPC are improved.

The invention provides an anti-PID multi-layer composite photovoltaic packaging adhesive film and a preparation method and application thereof.The adhesive film comprises a first EVA adhesive film layer, a second EVA adhesive film layer and a third EVA adhesive film layer which are sequentially stacked, the first EVA adhesive film layer comprises an acid absorbent, the second EVA adhesive film layer comprises an ion trapping agent, and the third EVA adhesive film layer comprises a second EVA adhesive film layer and a third EVA adhesive film layer which are sequentially stacked. And the third EVA adhesive film layer comprises an ion trapping agent and an acid absorbent. The acid absorbent is added into the first layer of the anti-PID multilayer composite photovoltaic packaging adhesive film to absorb acetic acid generated by EVA hydrolysis, so that the reaction between the acetic acid and sodium salt on the surface of glass is effectively reduced; an ion trapping agent is added into the second layer to effectively block sodium ion migration, and a dual initiation system improves the crosslinking degree to further block ion migration; an ion trapping agent is added into the third layer to further absorb free ions, and an acid absorbent prevents acid corrosion to the battery piece and the lead; the multi-layer structure synergistically realizes high-efficiency PID resistance.

The invention provides a preparation method of triphenylchloromethane, and belongs to the technical field of medical intermediates. The preparation method comprises the following steps: preparing a suspension from pure benzene, a composite catalyst and an adsorbent, dropwise adding carbon tetrachloride to obtain a reaction solution, heating the reaction solution to 60-80 DEG C, treating with 808nm laser while stirring, and performing post-treatment to obtain the triphenylchloromethane. The composite catalyst catalyzes pure benzene and carbon tetrachloride to react to generate triphenylchloromethane, hydrogen chloride is released, the adsorbent can adsorb hydrogen chloride in situ, and acid corrosion and catalyst poisoning can be prevented while forward proceeding of the reaction is maintained; the composite catalyst and the adsorbent are used for realizing catalysis-adsorption synergistic promotion of forward proceeding of the reaction, so that the dosage of the catalyst is reduced, the reaction time is shortened, the output of wastewater is reduced, and the reaction yield and the purity of triphenylchloromethane are improved.

The present invention relates to the technical field of surface modification of biochar, and discloses a method for enhancing the surface conductivity of biochar, a composite material loaded with transition metals thereof, and applications. Aiming at the problem of poor conductivity of biochar, in the present invention, lignocellulose or cellulose is impregnated in a solvent containing transition metal ions and nitrogen / oxygen / phosphorus heteroatoms, and a metal-heteroatom-cellulose complex precursor is formed through a hydrothermal reaction, and then through high-temperature calcination and pickling treatment, a composite material with a high-conductivity carbon layer and a stable transition metal nanoflower structure is prepared. This method utilizes the strong complexation of transition metals with cellulose and the solvent to form a metal-heteroatom-doped carbon layer on the surface of biochar, which has excellent interfacial electron transfer ability (R ct = 1.671 Ω). The obtained material has both a high specific surface area, a porous structure, excellent oxygen electrocatalytic activity, and acid corrosion resistance stability, and can replace noble metal catalysts and be applied to energy devices such as fuel cells.

Methods for treating a subterranean formation with a treatment fluid comprise introducing the treatment fluid into a wellbore extending into a subterranean formation, measuring a surface treating pressure, changing a concentration of the friction reducer to have at least two surface treating pressure measurements within a surface treating pressure range, establishing a relationship between the surface treating pressure measurements and the concentrations of the friction reducer, evaluating a friction reducer efficiency, and selecting the friction reducer with the best efficiency for a next stage of a multistage fracturing job. The treatment fluid includes water, an acid, a corrosion inhibitor, and a friction reducer.

The invention relates to the technical field of surface treatment devices, and discloses a high-temperature sulfuric acid corrosion resistant amorphous coating preparation device and method.The high-temperature sulfuric acid corrosion resistant amorphous coating preparation device comprises a preparation device body and a feeding port fixedly connected to the top of the preparation device body and further comprises a spraying chamber fixedly connected to one side of the preparation device body; a processing mechanism is arranged in the preparation device body, the processing mechanism is used for mixing coating raw materials, and the processing mechanism comprises a shaking plate slidably connected to the interior of the preparation device body. Through the arrangement of the first motor, the second motor, the mixing chamber and the grinding chamber, the effect of synchronously conducting preparation and spraying operation is achieved, the working efficiency of spraying is improved, and the problem that when an existing amorphous coating preparation device is used, the spraying step and the preparation step are usually separately arranged, and the spraying time is shortened is solved. And the operation mode greatly influences the spraying effect on the base material and is not beneficial to rapid processing.

The invention provides an acid-corrosion-resistant low-carbon seamless steel pipe thickness measuring device, and particularly relates to the technical field of steel pipe thickness metering, the acid-corrosion-resistant low-carbon seamless steel pipe thickness measuring device comprises a middle-position laser head and at least one side-position laser head, the middle-position laser head and the side-position laser head are used for detecting the wall thickness of a plurality of to-be-measured pipes arranged in groups, and a motion platform is arranged outside a laser thickness measuring assembly; according to the thickness measuring device for the acid-corrosion-resistant low-carbon seamless steel pipe, the laser thickness measuring assembly is driven by the motion platform to move in the arrangement direction, the axial direction and the vertical direction of the steel pipe; the problems that in the prior art, a feeding separation mechanism needs to be additionally arranged, and feeding time is long and equipment cost is high due to the fact that steel pipes are conveyed one by one are solved, it is achieved that the bundled steel pipes can be detected in place, additional operation such as separation and single feeding of the steel pipes is not needed, feeding time and equipment input cost are greatly reduced, and the production efficiency is improved. And meanwhile, stable basic positioning support is provided for batch detection, and the detection flexibility and adaptability are improved.

The application relates to the technical field of sodium ion batteries, and particularly discloses a negative electrode sheet based on an anodic aluminum foil and a preparation method thereof, which comprises: a honeycomb-shaped porous current collector including a pure aluminum foil layer and a nano-porous aluminum oxide layer, wherein the nano-porous aluminum oxide layer is obtained by sequentially performing anodic oxidation and acid corrosion on the aluminum foil current collector; a first coating layer, which is a high-specific-energy phosphorus-doped material and is embedded in the porous structure of the nano-porous aluminum oxide layer; and a second coating layer, which is made of hard carbon material and is coated on the first coating layer. In the application, the aluminum foil is treated by anodic oxidation to obtain a honeycomb-shaped nano-porous aluminum oxide layer, and then the thickness and pore size of the oxide layer are regulated by acid corrosion treatment, so that the surface roughness of the aluminum foil is improved, the adhesion between the electrode sheet and the current collector is improved, and the volume expansion of the phosphorus-based material is inhibited through the embedding design of the first coating layer, thereby improving the cycle stability and safety of the battery.

The invention relates to a method for treating a silicon sample for an inert gas melting infrared absorption method, which comprises the following steps of: polishing, pretreating and corroding the surface of a silicon sample block, washing and drying to obtain the silicon sample, and corroding the surface of the silicon sample block by acid corrosion and alkali corrosion, the acid corrosion process comprises the following steps: mixing a nitric acid aqueous solution, a hydrofluoric acid aqueous solution and glacial acetic acid according to a volume ratio of (10-9): (2-3): (3-4) to obtain a mixed acid corrosion solution, dividing the mixed acid corrosion solution into two parts according to a volume ratio of 4: (3-4), putting one part of the mixed acid corrosion solution and a silicon sample block into a reactor, and reacting for 8-10 minutes until a large number of bubbles start to appear on the liquid surface, after a large amount of smoke is generated on the surface of the liquid level, the other part of the mixed acid corrosion liquid is added into the reactor to change the reaction path in the reactor and further control the reaction rate in the reactor, an oxide layer on the surface of a silicon sample can be thoroughly removed, and the accuracy of measuring the oxygen content of a semiconductor material through an inert gas melting infrared absorption method is improved.

The present invention discloses a flux-cored wire for enhancing the acid corrosion resistance of the surface of low-carbon steel, which comprises a flux core and a wire sheath. The flux core is composed of the following components by mass percentage: Mn powder: 50-60%; CrN powder: 5-8%; Al powder: 5%-8%; Si powder: 1%; Fe powder: the balance, and the sum of the mass percentages of the above components is 100%. It is used to improve the disadvantages of the acid corrosion resistance of the surface of low-carbon steel, thereby effectively prolonging the service life of low-carbon steel structural parts in a corrosive environment. A method for enhancing the acid corrosion resistance of the surface of low-carbon steel is also disclosed.

The invention provides a universal method for improving activity and stability of a NiFe-based catalyst and application of the universal method, and relates to the technical field of clean energy and new materials.The method comprises the steps that 1, NiFe-based catalyst dispersion liquid with a certain concentration is prepared to serve as a solution A; preparing an organic phosphonic acid corrosion inhibitor diluted solution with a certain concentration as a solution B; and step 2, uniformly mixing the solution A and the solution B, adding a certain amount of a binder, and carrying out high-speed shearing and / or high-pressure homogeneous dispersion to obtain the uniform and stable final slurry. The organic phosphonic acid corrosion inhibitor is used for modifying the NiFe-based catalyst, so that a strong and effective chelation protection layer is formed on the surface of the NiFe-based catalyst, the catalytic activity and stability of the NiFe-based catalyst are improved conveniently, the method is simple and convenient in process and compatible with an existing electrode manufacturing process, the high oxygen evolution activity of the catalyst can be maintained, and meanwhile the catalytic activity and stability of the NiFe-based catalyst are improved. And the long-term running durability of the device is greatly improved, and the device is suitable for a high-performance and long-service-life AEM water electrolysis hydrogen production system and an OER test.

The utility model belongs to the field of acid corrosion of semiconductor silicon wafers, and particularly relates to a novel corrosion frame suitable for acid corrosion of monocrystalline silicon wafers, which comprises four positioning grooves symmetrically arranged on two sides of a frame, four rolling shafts are arranged between two sides of the frame, two ends of each rolling shaft are connected with a movable module, and the movable module is connected with the positioning grooves. The movable modules are arranged in the corresponding positioning grooves in a sliding mode, and a plurality of grooves are formed in the rolling shaft in the axial direction; the acid corrosion rack has the following advantages: (1) the silicon wafer is limited through the four rolling shafts during acid corrosion, so that the silicon wafer is prevented from falling off the corrosion rack; (2) the effect of changing the distance between the rolling shafts can be achieved through the movable module which is arranged in the module track in a sliding manner, so that silicon wafers with different specifications and sizes can be processed without replacing a corrosion frame with a corresponding specification, and the cost is greatly reduced; and (3) the rolling shaft is not directly abraded with the corrosion frame any more, and when abrasion is caused by long-term work, only the movable module needs to be replaced, and the whole corrosion frame does not need to be replaced.

This invention relates to the field of coating technology, specifically to a protective coating for stone surfaces with good waterproof performance and its preparation method, comprising the following steps: S1. Treating microcrystalline cellulose to obtain product 1 for later use; S2. Reacting product 1 from step S1 with titanium tetrachloride to obtain nano-titanium dioxide for later use; S3. Mixing the nano-titanium dioxide from step S2 with sodium oleate and adjusting the pH to 6.5-7.5 to obtain product 2 for later use; S4. Performing surface synergistic hydrophobic modification treatment on product 2 to obtain functional filler. This invention discloses a protective coating for stone surfaces with good waterproof performance, using fluorinated acrylic resin as the base resin, incorporating functional filler, and combining it with a curing agent, mixed solvent, defoamer, and leveling agent. Through the synergistic effect between the components, this protective coating for stone surfaces possesses good waterproof performance as well as good resistance to ultraviolet aging and acid corrosion.

The invention discloses an anti-corrosion composite coating for an ammonia gas engine, relates to an anti-corrosion technology for an ammonia gas fusion engine, and solves the technical problem that the reliability, durability and commercialization process of an ammonia fuel engine are restricted by the existing engine material system and protection technology. The composite coating comprises a base material arranged on the surface of the ammonia gas engine component; the base material layer is adjacent to the base material layer, is arranged on the surface of the base material and is used for resisting ammonia-alkali corrosion; the middle transition layer is arranged on the surface of the adjacent base material layer and is used for component gradient transition and stress relief; and the outermost surface layer is arranged on the surface of the middle transition layer and is used for resisting acid corrosion and pitting corrosion. The invention further discloses an intelligent corrosion prevention system and method for the ammonia gas engine. The invention solves the problem of limited protection performance of the traditional single coating.

The utility model discloses etching equipment. The etching equipment comprises a vacuum infiltration device which comprises an infiltration tank and a vacuum mechanism, wherein the vacuum mechanism is connected with the infiltration tank and is used for vacuumizing the infiltration tank; in the alkali corrosion device, a first temperature control assembly is used for controlling alkali liquor in an alkali liquor tank to be at a preset first temperature value, and a first bubbling assembly is used for generating bubbles in the alkali liquor; and / or the acid corrosion device comprises an acid liquor tank, a second temperature control assembly and a second bubbling assembly, the second temperature control assembly is used for controlling the temperature value of the acid liquor in the acid liquor tank not to exceed a preset second temperature value, and the second bubbling assembly is used for generating bubbles in the acid liquor; and the carrying device is used for carrying the materials treated by the vacuum infiltration device to at least one of the alkali corrosion device and the acid corrosion device. Through the mode, the etching equipment provided by the utility model can customize the optimal wet etching process adaptive to the glass substrate based on requirements, and can greatly improve the pore-forming efficiency of the glass substrate.