177results about How to "Play a role in corrosion inhibition" patented technology

The invention relates to a phosphorus-free corrosion and scale inhibitor, which is prepared from sodium molybdate, zinc salt, citrate, triethanolamine, benzotriazole (BTA), polyaspartic acid (PASP), polyepoxysuccinic acid (PESA), AA / AMPS terpolymer, solid alkali and water. The phosphorus-free corrosion and scale inhibitor inhibits corrosion of metals by forming oxidization type and precipitation type films on the surfaces of the metals, has the effect of inhibiting scale through chelation and dispersive action on salts causing scale in cooling water, is non-toxic and phosphorus-free, has easily biodegradable major organic compositions, does not cause environmental pollution and is not limited by phosphorus in emission.

A compound inhibition antisludging agent is used for treating high-concentration circulation water, comprising a liquid part and a solid part. Based on that the total weight of the liquid part is deemed to be 100 percent, percentages of each component by weight are: organic phosphonic acid 5-40 percent, organic carboxylic acid 5-40 percent and water 20-90 percent; and based on that the total weight of the solid part is deemed to be 100 percent, percentages of each component by weight are: polymer with antisludging effect 5-35 percent, alkaline agent 45-80 percent, azoles 1-10 percent and zinc salt 1-10 percent. The concentrations of the liquid part and the solid part in the circulating water are that: the solid part: the dosage of the agent added into make-up water is 20-200mg / L; the liquid part: total phosphine kept in the circulating water system is 10-15mg / L. The invention has effects of inhibition, antisludging, sterilization and algae removal upon meeting the requirements of the state, can promote the concentration multiple of the circulating water system up to 7.5 or more and can be operated at normal temperature with good effect and without pre-membrane treatment.

The invention discloses anticorrosive sealing liquid and a method for sealing an anodic oxide film containing a copper-aluminium alloy by utilizing the same. The anticorrosive sealing liquid is prepared by dissolving 5-15g of adipate and 10-100mu g of anticorrosive in 100ml of deionized water. The anticorrosive is 2-mercaptobenzothiazole, benzotriazole, salicylaldoxime, 8-hydroxyquinoline or quinaldic acid. The sealing method is characterized by sealing the anodized copper-aluminium alloy in the electric field. By the sealing method, not only the micropores of the anodic oxide film are sealed, but also the anticorrosive is adsorbed in the anodic oxide film in the applied electric field, when the anodic oxide film is corroded, the anticorrosive is released from the micropores of the anodic oxide film through capillarity to play a role of corrosion inhibition to the copper-bearing phases in the base materials containing the copper-aluminium alloys to prevent further corrosion.

The invention relates to rapid judgment for the corrosion of a sodium bicarbonate water type oil well, which is applied to the corrosion treatment of a pit shaft of the oil well. A production liquid is of a sodium bicarbonate water type. When the mole ratio of Ca to HCO3- is between 0 and 1 and less than 0.6, the corrosion which is local corrosion and scale formation coexist; along with the increase of the mole ratio of the Ca to the HCO3-, the scale formation of the pit shaft is relieved, but the corrosion becomes serious; and when the mole ratio of the Ca to the HCO3- is greater than 0.6, the pit shaft of the oil well is mainly corroded. The corrosion condition of a sodium bicarbonate water type medium is fast known through the mole ratio of the Ca to the HCO3-. A corrosion inhibitor for the sodium bicarbonate water type medium is made from the following components in percentage by weight: 20 to 35 percent of carboxylate sodium imida, 20 to 35 percent of water-soluble rosinyl imidazoline, 5 to 10 percent of dodecyldimethylbenzylammonium chloride, 0 to 5 percent of aminotri-methylene phosphonic acid, 0 to 5 percent of hydroxyl ethidene diphosphonic acid, 5 to 10 percent of methanol, 2 to 5 percent of dispersant and the balanced of water. The rapid judgment and the corrosion inhibitor can improve the efficiency of corrosion inhibition.

The invention provides a novel corrosion and scale inhibitor and a preparation method thereof. The novel corrosion and scale inhibitor comprises a corrosion inhibitor, a scale inhibitor and etidronic acid with the mass ratio of (0.1-1):(1-90):(0.1-10), wherein the corrosion inhibitor is a compounded corrosion inhibitor and comprises the following raw materials: oleic acid, diethylenetriamine, a quaternary ammonium reagent, and a compound; the compounded corrosion inhibitor is prepared by the following steps: obtaining imidazoline intermediates through the reaction between the oleic acid and diethylenetriamine; reacting with the quaternary ammonium reagent and obtaining an imidazoline quaternary ammonium salt corrosion inhibitor; finally, adding the compound and compounding to obtain the compounded corrosion inhibitor. The invention further provides the preparation method of the corrosion and scale inhibitor. The novel corrosion and scale inhibitor provided by the invention has the function of inhibiting corrosion and scale simultaneously and can effectively solve the problem of oilfield water scaling in the field of oil fields.

The invention discloses an application of ionic liquid which serves as a steel corrosion inhibitor. The imidazolyl lysine salt ionic liquid serves as a corrosion inhibitor, only the corrosion inhibitor is required to be added into a solution contacted with steel, and the corrosion inhibitor is easy to operate and good in corrosion inhibition effect. The corrosion inhibitor is environment-friendly, high in solubility and biodegradability and good in corrosion inhibition effect, and solves the problems that the conventional corrosion inhibitor has large toxic and side effects, low biodegradation, poor environment friendliness and the like.

The invention provides a phosphate-free high-biodegradability scale and corrosion inhibitor applicable to water reclamation, which mainly comprises an agent A and an agent B, wherein the agent A is prepared from the following raw materials in parts by weight: 3-6 parts of polyepoxysuccinic acid, 1.3-4.5 parts of sodium molybdate, 20-35 parts of phosphate-free antiscale dispersant, 0.5-1.5 parts of benzotriazole and 52-75.2 parts of deionized water; and the agent B is prepared from the following raw materials in parts by weight: 5-12 parts of sodium gluconate, 15-30 parts of zinc sulfate, 0.5-3 parts of concentrated sulfuric acid and 55-80 parts of deionized water. The preparation method comprises the following steps: respectively preparing the agent A and agent B, and uniformly stirring to obtain the scale and corrosion inhibitor. The experiment indicates that the composite scale and corrosion inhibitor has favorable scale inhibition property and corrosion inhibition effect for reclaimed circulating cooling water.

The invention discloses a biodegradable non-phosphorous anti-scale corrosion inhibitor and a preparation method thereof. The biodegradable non-phosphorous anti-scale corrosion inhibitor comprises, by mass, 10-20% of polyaspartic acid, 5-20% of polyepoxysuccinic acid, 30-60% of copolymers, 5-10% of zinc salt, 2-5% of fluorescent tracers and the balance water, wherein the molecular weight of the copolymers ranges from 2000-10000, and the copolymers are maleic anhydride / acrylic acid / acrylic acid oxylactone / 2-acrylamide-2-methylpro panesulfonic acid quaternary copolymers. The non-phosphorous anti-scale corrosion inhibitor is used for stainless steel condenser circulating cooling water systems of thermal power plants, is non-phosphorous, non-toxic, easily biodegradable, free from environmental problems and unlimited in discharge, and is capable of controlling carbon steel corrosion rate to be smaller than or equal to 0.075mm / a, controlling corrosion rate of copper, copper alloy and stainless steel to be smaller than or equal to 0.005mm / a, controlling dirt deposition rate to be smaller than or equal to 15mcm and controlling scale inhibition rate to be larger than or equal to 80%.

The invention relates to a scale and corrosion inhibitor using recycled water as circulating cooling water in a fired power plant, a method and an application thereof. The recycled water is civic recycled water which is used as the circulating cooling water in the fired power plant in the manner of moisturizing, wherein the scale and corrosion inhibitor contains two sets of components: the first set of component contains organic phosphonate, polycarboxylic polybasic copolymer, zinc salt and water which is used as the solvent, and the second set of component contains copper corrosion inhibitor. The two sets of components are separately packaged. The scale and corrosion inhibitor can efficiently prevent calcium carbonate, scatter calcium carbonate crystallite, change the state of the calcium carbonate crystallite and prevent the generation of ferric oxide and calcium phosphate scale. The invention has the function of preventing the scale and corrosion of the civic water which is rich in salt, ammonia nitrogen and COD, is high in basicity and hardness and has strong anti-corrosion property. The scale and corrosion inhibitor of the invention can meet the demand of inhibiting scale and corrosion by only using 10 to 50 mg / l, so the industrial water usage and cost are saved and the benefit is high.

The invention belongs to the technical field of sewage treatment, and especially relates to a phosphorus-free scale and corrosion inhibitor, and a preparation technology thereof. The preparation technology of the phosphorus-free scale and corrosion inhibitor has the advantages of simplicity, no generation of toxic substances, environmental protection and low cost; and the molecular chain of the prepared scale and corrosion inhibitor contains rich ether groups, carboxylate radicals and other active groups, the phosphorus-free scale and corrosion inhibitor and scale forming cations form a stable structure in order to reach the high-efficiency scale and corrosion inhibition purpose, the corrosion inhibitor has the advantages of phosphorus-free, nontoxic, green and environmentally-friendly components, good biodegradability and small use amount, can form an adsorption film on the surface of metal in order to realize the corrosion inhibition effect, has good chelating and dispersing effects on calcium salts in water, and has a distortion effect on crystals to increase the internal stress of the crystals in order to make the crystals easily ruptured.

The invention relates to a scale and corrosion inhibiting agent for the circular cooling water of an oxygen preparation plant as well as a method and an application thereof, which are characterized in that the scale and corrosion inhibiting agent comprises the following components: organic phosphonate, polycarboxylic acid multicomponent copolymer, copper corrosion inhibiting agent, zinc salt, polyaspartic acid and water, wherein the water is solvent. The scale and corrosion inhibiting agent can effectively prevent the formation of calcium carbonate, disperse calcium carbonate microcrystals, change the crystallization state of the calcium carbonate and have favorable performance for preventing the formation of calcium carbonate scale in the circular cooling water. The invention has the effect of preventing calcium carbonate incrustation under the complicated condition that the circular cooling water of the oxygen preparation plant is not only used by a high-temperature heat exchanger, but also used by low-temperature freezing water equipment and low-temperature equipment. Only 10-50 mg / L of scale and corrosion inhibiting agent can achieve the requirement of scale and corrosion inhibition, and the invention greatly saves the industrial water consumption amount and the economic cost and has favorable economic and social benefits.

The invention discloses an anti-corrosion anti-freezing liquid which is composed of benzotriazole, polysorbate 80, a nonionic surface active agent, polymer salt, a heterocyclic compound, rare-earth salt, propylene glycol and glycerol. The concentration of the benzotriazole is 0.1-2.0g / L, the concentration of the polysorbate 80 is 1-5mg / L, the concentration of the nonionic surface active agent is 0.01-0.1g / L, the concentration of the polymer salt is 0.1-0.2g / L, the concentration of the heterocyclic compound is 0.05-0.15g / L, the concentration of the rare-earth salt is 0.01-0.1 g / L, the concentration of the propylene glycol is 150-500mg / L, and the concentration of the glycerol is 100-450mg / L. According to the anti-corrosion anti-freezing liquid, the propylene glycol and the glycerol with low viscosity are used as the anti-freezing liquid, heat exchanging effects are guaranteed, the stability is good, the anti-freezing liquid is environment-friendly, prior process flows are not destroyed, auxiliary devices are not required, the usage is convenient, the investment is small, and returns are fast.

The invention discloses a method for using an anionic zinc houghite for preparing a zinc cathode of a zinc-nickel secondary battery. The method comprises the following steps: (1) mechanically mixing 65-85 parts by weight of anionic zinc houghite, 5-10 parts by weight of conductive agent and 10-30 parts by weight of other zinc compounds to obtain a cathode material mixture; (2) adding a dispersingagent aqueous solution into the cathode material mixture obtained in the step (1), and then adding an adhesion agent while violently stirring, thereby obtaining uniform liquid zinc cathode slurry; and (3) uniformly coating the zinc cathode slurry acquired in the step (2) on two sides of a zinc electrode current collector, drying the two sides, and then cutting the zinc electrode current collector, thereby acquiring an end product of a zinc cathode plate. The method provided by the invention is characterized in that the anionic zinc houghite is firstly used for preparing the zinc cathode of the zinc-nickel secondary battery. The method provided by the invention can be used for weakening the deformation of the zinc cathode, restraining the solution of active materials of the zinc electrode and promoting the reversibility and the cycle life of the zinc-nickel secondary battery.

The invention discloses a composite corrosion and scale inhibitor for an open type cooling water system made of a galvanized pipe, a preparation method and application thereof. The composite corrosion and scale inhibitor for the cooling system comprises the following components in percentage by weight: 1 to 20 percent of organophosphorus carboxylic acid, 1 to 30 percent of polycarboxylic acid, 1 to 10 percent of organic multicopolymer, 1 to 10 percent of methylbenzotriazole, 1 to 15 percent of polyhdric alcohol phosphate ester, 0.1 to 1 percent of zinc element in a zinc source, and the balance of water. The composite corrosion and scale inhibitor is suitable for the corrosion and scale inhibition treatment on the open type cooling water system made of the galvanized pipe, has good corrosion inhibition effect on a galvanized layer of the inner wall of the pipe of the cooling water system, and still has good scale-inhibiting effect when satisfying high concentration factor, high alkalinity, high hardness and high pH value at the same time.

The invention relates to a preparation method of a halogen-free environmental-friendly synergistic flame retardant phenolic foam composite material. The preparation method comprises the synthesis process of expandable low-viscosity phenolic resin by using phenol, formaldehyde solution, paraformaldehyde, calcium oxide and alkali catalyst, and the preparation process of the halogen-free environmental-friendly synergistic flame retardant phenolic foam composite material, wherein the synthesis process of expandable low-viscosity phenolic resin comprises the following steps of: 1) adding the phenol, the formaldehyde solution and the calcium oxide into a reaction container, 2) adding a first batch of paraformaldehyde and alkali catalyst into the reaction solution, 3) adding the remaining paraformaldehyde and a second batch of alkali catalyst, and 4) adding the remaining alkali catalyst, cooling and discharging the materials to obtain the expandable low-viscosity phenolic resin; and the preparation process of the halogen-free environmental-friendly synergistic flame retardant phenolic foam composite material comprises the following steps of: taking the expandable low-viscosity phenolic resin, adding surfactant, composite curing agent, halogen-free environmental-friendly flame retardant, carbonizing agent and synergist, evenly agitating, finally adding physical foaming agent, evenly agitating the mixture and foaming, curing and molding the mixture to obtain the product. The preparation method has the advantages of simple process, high product stability and wide application scope.

The invention provides a corrosion inhibition scale-removing agent used for CO2 flooding as well as a preparation method and use method of the corrosion inhibition scale-removing agent. The corrosioninhibition scale-removing agent is composed of the following substances, in percentages by weight: 17-21% of benzoic acid thioureido imidazoline, 1-3% of benzoic acid phosphate thioureido imidazoline,9-13% of isopropanol, 7-11% of acetic acid, 11-15% of sodium polyepoxysuccinate, 3-7% of OP-10, 12-16% of quinoline quaternary ammonium, 3-7% of poly(sodium-styrennesulfonate), 5-9% of ethylenediaminetetraacetic acid disodium salt, 11-15% of diethylenetriaminepentaacetic acid pentasodium salt, 2-6% of N-dodecyl methylene bis-sec-ammonium salt, and the balance of water. The corrosion inhibition scale-removing agent provided by the invention overcomes the problem that a current corrosion inhibitor usually has a single corrosion inhibiting effect and a current scale inhibitor usually has a single scale inhibiting effect, can effectively play a corrosion inhibition effect while efficiently preventing scaling of oilfield water, and especially has a better scale-removing effect on barium strontium scale formed by formation water with high barium and strontium ions.

The invention relates to an automobile windscreen cleaning agent and belongs to the technical field of cleaning agents. The windscreen cleaning agent is prepared by using the following raw materials in percentage by weight: 0.01 to 2 percent of nonionic surfactant, 0.1 to 1 percent of corrosion inhibitor, 0.1 to 5 percent of waterborne silicone oil, 3 to 35 percent of absolute ethyl alcohol, 0 to 0.001 percent of dye and balance of water, wherein the nonionic surfactant is polyether and / or low-foam fatty alcohol-polyoxyethylene ether; the corrosion inhibitor is more than one of benzotriazole, sodium benzoate, triethanolamine, ethylene diamine tetraacetic acid and borax; the waterborne silicone oil is more than one of polyether modified siloxane; the dye is direct fast blue. The windscreen cleaning agent is extremely low in corrosiveness, is high in use safety, can prevent dirt such as tree gum, bird feces and lac from being dried and hardened on the surface of an automobile windscreen to form stubborn stains, and any stain on the automobile windscreen can be easily and quickly removed; the service life of windscreen wipers is also prolonged and the windscreen is prevented from being scratched.

The invention relates to a corrosion prevention technique, especially to a corrosion prevention and repairing protective cover and uses thereof. The protective cover consists of an anti-soil material layer, a protection material layer, a polyester nonwoven cloth layer as well as a rust protection lipin layer from exterior to interior. A connection part is opened on the axial direction of the protective cover, two opposite sides of the connection part is equipped with an outward turnup edge fold. The inventive protective cover is convenient for dissembling, can be repeatedly used after opening and check-up, in addition, the covering layer can also endure slight damnification, and will not denaturate in the seawater surroundings after mounting. The invention not only is suitable for new sea steel construction article antisepticise and anti-soil, but also suitable for repairs of the corroded steel construction article. Thus the economy effective handy construction protection method, ensures normal work of dirt-proof boot and facilities, reduces maintenance cost, saves manpower and material resources, and improves durability.

The invention discloses a mercury-free diaphragm paper for a laminated cell, which is composed of a substrate and a coating, wherein, the coating is composed of a solid polymer electrolyte and bismuth chloride which is an inorganic mercury-substitute inhibiter; the solid polymer electrolyte is prepared by coordinated ionic liquid and PVA, PAM and starch; the coordinated ionic liquid is prepared by heating and melting urea, thiourea, zinc butter and ammonium chloride according to a certain proportion. The inorganic mercury-substitute inhibiter, bismuth chloride, in the coating of the invention can form a dense covering layer on the surface of a zinc electrode and form a good metallic film, thus realizing inhibition effect, reducing the discharge resistance of the battery and improving the capacity of the battery.

The invention discloses an aluminum alloy welding process and belongs to the technical field of metal welding. The aluminum alloy welding process comprises the following steps: (1) a welding area of the surface of an aluminum alloy plate is put into a cleaning fluid for ultrasonic cleaning and then dried; (2) the welding area of the to-be-welded aluminum alloy plate is heated to 150-200 DEG C; (3) the welding area of the to-be-welded aluminum alloy plate is heated to 750-830 DEG C, a degasifier is sprayed to the welding area of the aluminum alloy plate, and the aluminum alloy plate is welded with a special aluminum alloy welding wire; (4) the welded part of the aluminum alloy plate is subjected to solid solution at the temperature of 300-450 DEG C, and the aluminum alloy plate is subjected to degasification treatment through ultrasonic waves; (5) the welded part of the aluminum alloy plate after solid solution treatment is transferred to cold water and cooled to the room temperature; (6) clearing and removal of welding powder or slag are performed. With the adoption of the aluminum alloy welding process, the pore problem can be effectively solved, and incomplete fusion, incomplete penetration and cracking phenomena are unlikely to occur.

The invention discloses an organic acid cleaning agent and a manufacture method thereof. The cleaning agent comprises citric acid 5-15 parts, sulfuric acid 3-10 parts, edetic acid 5-10 parts, H-Benzotriazole 2-5 parts and distilled water 60-80 parts according to parts by weight. The organic acid cleaning agent can effectively solve the problem of generation of corrosion, scaling and slime of circulation water system pipelines and heat exchangers, prolong service life of equipment, improve heat exchange efficiency and achieve the requirement for environment protection.

The invention relates to a corrosion and deposit inhibiting combination for intermediate water sewage system, a fabrication and application method to be concerned, the corrosion and deposit inhibiting combination comprises an organic phosphonate, carboxylic acid multipolymer, zince sulfate and water; the corrosion and deposite inhibiting combination of the invention is fabricated by carboxylic acid multipolymer and other compounds, which can effectively prevent the formation of calcium carbonate in cool circulating water, and also has a favorable performance on preventing the formation of calcium phosphate scale, as the result shows, the corrosion and deposit inhibiting combination has an outstanding corrosion inhibiting effect, the corrosion velocity of carbon steel is only 0.05mm / a which is far smaller than 0.125mm / a equivalent to the national standard, the invention is applicable to a wide arrange of water quality fluctuation, and can provide with an outstanding corrosion and deposit inhibiting performance, the medicament consumption is small, only 40 to 60mg / l of the corrosion and deposit inhibiting combination in the invention can be used for capability of meeting the requirement on corrosion and deposit inhibiting, an industrial water consumption and an economic expense are tremendously saved, the economic benefit and the social benefit are favorable.

The invention relates to a chitosan carbon steel restrainer, which comprises components that are more than one selected from hydroxypropyl chitosan and carboxymethyl chitosan. The use of chitosan carbon steel restrainer is that the restrainer can be added into cleaning solution to clean steel by immersion. The cleaning solution is acid liquor, the addition amount of the restrainer in the acid liquor is 0.001 to 3.0 g / L, and the immersion is performed at room temperature for 0.5 to 4 hours. The product of the invention is used for surface cleaning of carbon steel and carbon steel product and the method can prevent over metal etching and excessive acid liquor consumption during cleaning and has the outstanding advantages of low price, low dosage, high efficiency and high continuous acting force.

The invention discloses a triazole modified mannich base compound and a preparation method thereof.CH3I and THF are added into a reactor, CH3SCH3 is added dropwise, and stirring is performed for 8-12 h; then, a deprotonation reaction is performed for 0.2-1.5 h, then, mannich base is added dropwise at the temperature of 15-35 DEG C, a heat preservation reaction is performed after the mannich base is added dropwise, and a mannich base epoxy compound is obtained; triazole and DMF are added into a reaction kettle, the mannich base epoxy compound is added into the reaction kettle dropwise, the base is added, a thermostatic reaction is performed, and a heterocyclic compound modified mannich base compound is obtained.A triazole modified mannich base corrosion inhibitor is obtained through an epoxidation reaction and etheric ring-opening reaction.According to the mannich base, N and O atoms are used as corrosion inhibitor molecules of an active center, complexing can be performed on lone pair electrons and metal ions in a coordinate bond mode to form a polymer, and the lone pair electrons can be combined with the metal ions so as to cover the surface of equipment in an adsorption membrane to achieve the corrosion inhibiting action.

The invention provides a synthesis method of a bis quaternary ammonium salt cationic surfactant. The method is simple and quick to operate; by using water as the reaction solvent, the cost is low; and the yield is up to 98% after purification. The synthesized bis quaternary ammonium salt can be widely used in industrial water treatment, performs the bactericidal and corrosion inhibition functions, and is also applicable to decompression and augmented injection of low-permeability oilfields.

The invention relates to a corrosion inhibitor used for preventing corrosion of brass. The corrosion inhibitor is characterized by comprising the following components by weight parts: 40-70 parts of organic polymer components, 5-20 parts of azole components, 1-8 parts of dispersing components, 1-8 parts of zinc salts and 1-5 parts of sodium gluconate. A preparation method of the corrosion inhibitor comprises dissolving the organic polymer components in a solvent, firstly adding the azole components, uniformly stirring and dissolving, and then sequentially adding the dispersing components, the zinc salts and the sodium gluconate to obtain finish product. Finally, the produced corrosion inhibitor has a concentration of 10-60 mg / L. According to the invention, the corrosion inhibitor used for preventing corrosion of the brass does not contain phosphorus components, and thus does not pollute water body; meanwhile, polyaspartic acid and polyepoxysuccinic acid are added, wherein the two are high-efficient and environmental-friendly components and thus are environment-friendly products. The corrosion inhibitor is scientific and reasonable in formula, and the preparation method is simple to operate, thereby being suitable for large-scale production.

The invention relates to a corrosion inhibiter for steel acid pickling, in particular to an environment-friendly corrosion inhibiter for carbon steel acid pickling, which can prevent carbon steels and the products from corroding carbon steel materials and over consumption of acidizing fluid in the acid picking process and the application thereof. The component of the corrosion inhibiter is one or the combination of hexanophenone-O-(1, 3, 4-tolyltriazole) methylene oxime, 4- methoxy acetophenone-O-1'- (1', 3', 4'- tolyltriazole) methylene oxime and 4-fluorine acetophenone-O-1'-(1', 3', 4'-tolyltriazole). The application of the corrosion inhibiter is that steels are immerged and washed in acid liquid added with tolyltriazole. The corrosion inhibiter of the invention can effectively prevent acid from corroding the carbon steel materials in acid picking process and has the outstanding advantages of low consumption, high corrosion inhibition efficiency, stable corrosion inhibiting performance and simple synthesis. Besides, the corrosion inhibiter for steel acid pickling of the invention has no pollution to environment, comparatively high productive value and wide market prospect.

The invention relates to the technical field of cleaning agents, particularly provides an online cleaning agent composition for heat conduction oil and a cleaning method, and aims at solving the problem that heat conduction oil cannot be cleaned in an online way. The cleaning agent composition comprises the following raw materials in parts by weight: 20 to 30 parts of base oil, 2 to 12 parts of an ashless dispersant, 18 to 28 parts of a clearing agent, 2 to 12 parts of a surfactant, and 30 to 45 parts of washing agent. According to the online cleaning method, online cleaning is performed on heat conduction oil through the cleaning agent composition, cooling is not required under the condition that a heat conduction oil system is normally operated, the cleaning agent composition is added into the heat conduction oil system, coked oil dirt on pipe walls is cleaned according to a compatibility principle, the online cleaning of the heat conduction oil is realized, the normal operation of the system is not affected, the phenomenon that pipes are blocked by dirt does not occur, the cleaning efficiency is higher than 98 percent, heat conduction can be improved, and energy consumption can be reduced.

The invention relates to a preparation method of Q420-grade hot-rolling weather-resistant angle steel. The preparation method of the Q420-grade hot-rolling weather-resistant angle steel comprises thefollowing steps: smelting a steel billet, rolling the steel billet, cooling the steel billet and straightening the angle steel. The Q420-grade hot-rolling weather-resistant angle steel can be producedon a large scale for use of a power transmission line iron tower.

The invention relates to a solar photothermal conversion heating circulation system, which effectively solves the problems of organic combination and sufficient utilization of solar energy and methane. A methane-generating pit is connected with a pretreatment pond; a radiator is communicated with a first water tank, a heating plate, an air-conditioning cooling cabin and a first water pipeline; the first water tank is communicated with a solar water heater, a methane water heater and a boiler; the air-conditioning cooling cabin is connected with a water-temperature air conditioner; the methane-generating pit is connected with a household methane purification regulator; a heat insulation wall is arranged at the periphery of an inner cylinder in the solar water heater; a heat storage pipe in the inner cylinder is filled with a heat storage agent; an electric superconducting liquid container and a heat superconducting liquid container are arranged in the lower part of the water-temperature air conditioner; electric superconducting liquid is filled in the electric superconducting liquid container; heat superconducting liquid is filled in the heat superconducting liquid container; and the inner box of the air-conditioning cooling cabin is provided with a coolant. The solar photothermal conversion heating circulation system effectively solves the problems of environment pollution phenomenon caused by using coal and straw to cook, and heating, and is the innovation in the utilization of the methane and the solar energy.