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113results about How to "Corrosion current reduction" patented technology

Ascorbic acid phosphorus-free corrosion and scale inhibitor, and preparation method thereof

The invention discloses an ascorbic acid phosphorus-free corrosion and scale inhibitor which is applicable for treatment of industrial circulating cooling water. The corrosion and scale inhibitor is prepared by compounding a maleic acid compound, an acrylic acid terpolymer, ascorbic acid, a sulfamic acid compound, a zinc salt, a gluconate and distilled water. The ascorbic acid phosphorus-free corrosion and scale inhibitor provided by the present invention provides good corrosion inhibition and scale inhibition effects for carbon steel equipment. The dosage of the phosphorus-free corrosion and scale inhibitor is 20 mg.L<-1> - 50 mg.L<-1> in the industrial circulating cooling water having an alkalinity less than 400 mg.L<-1>, a hardness less than 500 mg.L<-1>, a pH value less than 8.2, a conductance controlled from 0[mu]s.cm<-1>-2400[mu]s.cm<-1>. A plurality of experiment results show that the corrosion and scale inhibitor provides a annual corrosion rate lower than 0.04 mm.a<-1> and a calcium carbonate inhibition rate higher than 98% for the A3 carbon steel. Advantages of the ascorbic acid phosphorus-free corrosion and scale inhibitor and the preparation method are as follows: the discharged waste water during using the corrosion and scale inhibitor does not provide a eutrophic pollution caused by phosphor for water body; the environment is environment-friendly; agent cost for treating each ton of the water is less than 0.12 yuan; the product preparation process is simple.
Owner:WUHAN UNIV OF TECH +1

Method for preparing graphene oxide and micro-arc oxidized ceramic composite coating on surface of magnesium alloy

The invention provides a method for preparing a graphene oxide and micro-arc oxidized ceramic composite coating on the surface of a magnesium alloy and relates to a method of preparing a coating on the surface of the magnesium alloy. The method is used for solving the problem of poor corrosion resistance of the micro-arc oxidized ceramic coating of a porous structure due to large contact area of the coating with a corrosive medium in the corrosion process. The method comprises the following steps: 1, magnesium alloy pre-processing; 2, ultrasonic processing; 3, oil removal; 4, micro-arc oxidization; 5, graphene oxide preparation; 6, application of the graphene oxide solution to the micro-arc oxidized ceramic coating on the magnesium alloy, thereby obtaining the magnesium alloy coated with the graphene oxide and micro-arc oxidized ceramic composite coating. According to the method, the corrosion current density of the graphene oxide and micro-arc oxidized ceramic composite coating is reduced to 14.5nA/cm<2>, which is 1/7240 of the corrosion current of the matrix magnesium alloy. The invention relates to the method for preparing the graphene oxide and micro-arc oxidized ceramic composite coating on the surface of the magnesium alloy.
Owner:HARBIN INST OF TECH

Water base non-chrome zinc-aluminium coating and methods for preparing and using same

The invention relates to a water base non-chrome zinc-aluminium coating and methods for preparing and using the same. The coating is prepared by proportionally mixing a component A and a component B; the component A contains 50-150g/L of lamellar metal powder, 145-290ml/L of organic solvent, 10-200ml/L of deionized water, 10-36ml/L of reducing agent and 5-15ml/L of wetting agent; and the component B contains 60-240ml/L of deionized water, 20-75ml/L of binding agent, 8-22ml/L of thickening agent, 4-8ml/L of silicon compound and the balance of the organic solvent. The method for preparing the water base non-chrome zinc-aluminium coating comprises the steps of: weighing the lamellar metal powder proportionally to be mixed uniformly, and then adding the organic solvent to be mixed uniformly for later use; mixing the reducing agent with the wetting agent, adding an appropriate amount of the deionized water to be mixed uniformly, and then adding the lamellar metal powder liquid to prepare the component A; proportionally weighing the thickening agent, the binding agent and the silicon compound, and adding the organic solvent to be mixed uniformly to prepare the component B; and mixing the prepared component A and the prepared component B according to the ratio of 2:1, and stirring unit uniform, thus obtaining the coating. The method for using the water base non-chrome zinc-aluminium coating is that the coating is coated on a part to be treated, and the baking temperature is increased to 360 DEG C so as to solidify and crosslink the coating to form a dense protective layer. The coating has the corrosion resistance which reaches 840 hours of a neutral salt spray test and over 96 hours of a heat resistance test, the usage amount of harmful substances is greatly reduced, and the working environment is improved.
Owner:翊鹏(湖北)实业有限公司

Method for preparing novel conductive composite anticorrosive coating

The invention relates to a method for preparing a novel conductive polypyrrole / polyaniline composite anticorrosive coating. The method comprises the following steps of: dissolving p-toluenesulfonic acid into water, regulating the pH value of a solution to be an appropriate value, and adding pyrrole and aniline monomers to obtain a mixed solution; performing electrochemical synthesis by using a three-electrode system, wherein copper is taken as a working electrode, a platinum sheet is taken as an auxiliary electrode, and a reference electrode is a saturated calomel electrode; and performing electrochemical polymerization under certain electrical parameters by cyclic voltammetry to obtain a layer of conductive polypyrrole / polyaniline composite anticorrosive coating on the surface of the copper electrode. The conductive polymer coating generated on the surface of the copper has high adhesion and is uniform and compact; medium corrosion ions can be effectively hindered from penetrating the coating and permeating into the surface of a metal matrix for a long time; the composite coating effectively improves the corrosion potential of a copper matrix and reduces corrosion current; and in addition, after the prepared coating is damaged, a layer of passivating film can be quickly generated on the surface of the matrix so as to ensure that metal is free of corrosion.
Owner:常熟市通顺纺织有限责任公司

Aqueous polyanion metal composite anti-corrosion material and method for preparing the same

Disclosed is a water-based polyaniline composite metal corrosion-proof material and method for preparation, wherein the material is prepared from the following raw materials (by weight portions): sodium-based montmorillonite 3-8 parts, polystyrolsulfon acid 3-9 parts, deionized water 64-110 parts, phenylamine 1-4 parts, ammonium persulphate 3-9 parts, water-based epoxy resin emulsion 50-60 parts, and water-based epoxy resin curing agent emulsion 20-35 parts.
Owner:NORTHWEST NORMAL UNIVERSITY

Corrosion inhibitor of steel reinforced concrete

The present invention relates to a reagent containing organosilane and / or organo-silicone, use of the reagent, and a method for using the reagent to reduce the positive corrosion of the steel bar in the concrete. In addition, the present invention also relates to concrete that is produced by the reagent of the present invention.
Owner:GOLDSCHMIDT CHEM CORP

Environment friendly anti-corrosive paint and preparation thereof

The invention discloses environmental-friendly anti-corrosive polyaniline paint which has high content of polyaniline, good anti-corrosion performance and low cost, causes no pollution and is suitable for preventing steel, magnesium and other metals from being corroded. The environmental-friendly anti-corrosive polyaniline paint contains component A and component B which have the weight ratio of 7:1 to 17:1, wherein the component A contains the following components according to the portion by weight: 40-80 portions of liquid epoxy resin, 4-40 portions of plasticizing agent, 0.1-4 portion(s) of emulsifying agent OP-10, 4-10 portions of small-molecular fatty alcohol, 0.1-15 portion(s) of ammonium persulfate, 0.1-3 portion(s) of distilled water, 0.1-2 portion(s) of 0.4-0.8mol / L camphorsulfonic acid solution, 0.1-16 portion(s) aniline, 0.5-1 portion of defoaming agent and 4-20 portions of reactive diluent.
Owner:SHANDONG UNIV

High temperature resistance protective coating and preparing method and application thereof

ActiveCN106929799AImprove high temperature oxidation performanceHigh Al contentVacuum evaporation coatingSputtering coatingOxidation resistantTemperature resistance
The invention discloses a high temperature resistance protective coating and a preparing method and application thereof. The high temperature resistance protective coating comprises a TiN transition layer and an AlTiN coating formed on the TiN transition layer; and in addition, in the AlTiN coating, and the ratio of the Al atom number to the sum of the Ti atom number and the Al atom number is larger than 0.67 and smaller than 0.9. The preparing method includes the steps that a Ti target is selected as a target material, the working atmosphere is N2, an arc ion plating technology is adopted for deposition of the TiN transition layer on the substrate surface; and meanwhile, an Al target and an Al67Ti33 target serve as target materials, and the arc ion plating technology is adopted for deposition of the AlTiN coating on the TiN transition layer continuously. According to the high temperature resistance protective coating, the aluminum content in the AlTiN coating is high, the Al / Ti proportion is adjustable, the oxidation resistance temperature can reach 900 DEG C, the excellent high-temperature oxidation resistant performance and corrosion resistant performance are achieved, and therefore the comprehensive performance of the AlTiN coating, a high-speed cutter and titanium alloy parts is effectively improved, and the service life of the AlTiN coating, the high-speed cutter and the titanium alloy parts is effectively prolonged.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Chelate type flashing erosion-resistant water-based metal anticorrosion coating and preparation method thereof

The invention relates to a chelate type flashing erosion-resistant water-based metal anticorrosion coating and a preparation method thereof. A chelate type surfactant is used as a flashing erosion-resistant component. Being stirred, the chelate type surfactant, composite assistant and deionized water are added and blended and then continually stirred with composite filler added. Being stirred, superfine anticorrosion pigment is added uniformly and then is stirred continuously for a certain time. Color paste obtained is dispersed and homogenized by a high-shear emulsion machine and then sent to a horizontal sand mill to be ground into pigment filler color paste with the particle size being less than or equal to 10mum. Being stirred at high speed, ternary blending resin is slowly added in the pigment filler color paste and stirred continuously for a certain time so that polyvalent metal oxide formed by flashing erosion and the chelate type surfactant form complex. Under the migration action of the surfactant, the complex can be easily stripped from a metal substrate, so that the substrate remains smooth. Therefore, the anticorrosion ability of the water-based anticorrosion coating is improved and the adhesion of the coating on the substrate is not affected.
Owner:大连市轻化工研究所有限公司

Biomimetic mineralization method for preparing magnesium alloy-calcium phosphate coating composite material

The invention relates to a biomimetic mineralization method for preparing a magnesium alloy-calcium phosphate coating composite material. The method comprises single preprocessing, acid etching preprocessing, bionic solution configuration, immersing in the bionic solution and the like to obtain the magnesium alloy-calcium phosphate coating composite material. Compared with other magnesium alloy-calcium phosphate coating composite materials, a magnesium alloy base body is firstly subjected to acid etching preprocessing, so that the calcium phosphate coating and the surface of the base body can be combined well; and the calcium-phosphate ratio of the bionic solution is 1.67:1, besides, the content of the calcium and the phosphate is higher than that of ordinary bionic solutions in the prior art, the biomimetic mineralization efficiency can be improved remarkably, and the calcium phosphate products are similar to human bone components and have good biocompatibility and corrosion resistance.
Owner:TONGJI UNIV

Method for preparing super-hydrophobic coating based on electrodeposition method, and application of super-hydrophobic coating

The invention relates to a method for preparing a super-hydrophobic coating, in particular to a method for preparing a super-hydrophobic coating based on an electrodeposition method, and the application of the super-hydrophobic coating to the corrosion prevention of a power grid, and belongs to the technical field of super-hydrophobic coatings. The method for preparing the super-hydrophobic coating based on the electrodeposition method comprises the following step I of electrode pretreatment: grinding a steel electrode on abrasive paper, and then cleaning the steel electrode ground properly with deionized water made by a laboratory; then, performing polishing treatment with aluminium powder for further removing large oil stains; and next, rewashing the steel electrode with the deionized water made by the laboratory. The method has the beneficial effects that the super-hydrophobic coating is prepared with the electrodeposition method, and applied to the corrosion prevention of the powergrid; the corrosion potential is increased and the corrosion current is reduced when the super-hydrophobic coating is used; it is proved that the corrosion resistance of the electrode with the coating is better than the corrosion resistance of the electrode without the coating, and the good corrosion resistance effect of the power grid is achieved.
Owner:SHANDONG INST OF BUSINESS & TECH

Composite protection method for magnesium-lithium alloy surface and special epoxy/nano SiO2 paint

The invention provides a composite protection method for a magnesium-lithium alloy surface and a special epoxy/nano SiO2 paint. The method comprises the following steps: synthesizing a novel epoxy/nano SiO2 paint; pretreating the surface of the magnesium-lithium alloy; carrying out phytic acid conversion on the surface of the magnesium-lithium alloy to form a phytic acid conversion film on the surface of the magnesium-lithium alloy; and coating and compounding the epoxy/nano SiO2 paint on the phytic acid conversion film of the magnesium-lithium alloy. The introduction of nano SiO2 is beneficial to improving the corrosion resistance of the epoxy paint. At the same time, the unimolecular organic film layer formed by phytic acid conversion and the coating formed from the epoxy/nano SiO2 paint have similar chemical properties, and the cohesive properties of the both are enhanced, thereby being beneficial to forming a stable and compact protective layer on the surface of the magnesium-lithium alloy to have a dual protection effect on the magnesium-lithium alloy and further improving the corrosion resistance of the magnesium-lithium alloy. Thus, the corrosion potential of the magnesium-lithium alloy is increased by 0.8-1.2VSCE, and the corrosion current is reduced by 4-6 orders of magnitude.
Owner:苏州嘉祥树脂有限公司

Laser cladding method for improving surface performance of magnesium alloy AZ91D

The invention provides a laser cladding method for improving the surface performance of magnesium alloy AZ91D. The method adopts Co-Cr alloy powder as a cladding material, and comprises the following steps of 1, pre-treating the surface of a magnesium alloy workpiece; 2, cladding the surface of the magnesium alloy workpiece; 3, obtaining the appearance, composition phase and structure characteristics of the cladding layer by combining a Co-Cr phase diagram and a Co-W-C phase diagram by adopting a SEM (scanning electron microscope) or XRD (X-ray diffraction) analysis means and applying a solidification theory; and 4, testing the mechanical performance and electro-mechanical performance of the surface of the magnesium alloy workpiece according to the composition phase, the appearance and characteristics of distribution, grain size, columnar crystal and dendritic crystal of a solidified tissue. A product fulfilling the requirement can be obtained when the specific surface performance can be achieved. The laser cladding method has the advantages of high hardness of the surface of the magnesium alloy, improved wearing and corrosion resistance, firm combination of effective working layer and matrix, has a certain size and thickness, and is low in cost.
Owner:SUZHOU TIANHONG LASER

Composite multi-layer hydrophobic and anti-corrosion film as well as preparation method and application thereof

The invention discloses a composite multi-layer hydrophobic and anti-corrosion film as well as a preparation method and an application thereof. The film comprises a first metal adhesion layer, a hydrogen-containing amorphous carbon film layer and a hydrogen-free amorphous carbon film layer from bottom to top and is prepared through magnetron sputtering with control on the ratio of argon to hydrogen. Physical and chemical characteristics of different hybridization composition types of carbon are considered, the amorphous carbon film adopting the dual-layer structure is designed, the a-C:H filmis used as a conductive substrate, and thin-layer a-C with the surface covered is used as the anti-corrosion and hydrophobic medium. Through the structural design, the amorphous carbon film can effectively improve the anti-corrosion performance of the film structure on the basis that the conductivity is guaranteed. The design concept has the great prospect for application in the field of metal corrosion resistance and bipolar plates and has the very positive promotion significance for application of metal bipolar plates to hydrogen cells.
Owner:FOSHAN UNIVERSITY

Method for preparing composite coating by surface differential arc oxidation/chemical conversion of Mg-Li alloy

The invention provides a method for preparing a micro-arc oxidized / chemically converted composite coating on the surface of Mg-Li alloy. The method comprises the following steps: in an electrolyte consisting of 3 to 30 grams of silicate per liter, 1 to 10 grams of sodium hydroxide per liter, 10- 30 milliliters of triethanolamine per liter and 1 to 3 liters of distilled water, pretreated Mg-Li alloy is subjected to micro-arc oxidation for 4 minutes by use of a constant-current micro-arc oxidation mode, at the pulse frequency of 2,000 Hz, with the duty cycle of 15 percent and the current density of 5 A / dm<2>; the Mg-Li alloy subjected to the micro-arc oxidation is completely placed in a chemical conversion solution; the conversion solution consists of 5 to 40 grams of molybdate per liter, 1 to 10 grams of sodium fluoride per liter and 1 to 15 milliliters of hydrogen peroxide with the concentration of 30 percent; the reaction temperature of chemical conversion is 45 DEG C; the reaction time of chemical conversion is 0.5 to 3 hours; and after the chemical conversion treatment, the film-covered Mg-Li alloy is taken out and dried with cold air. The method has the advantages of high efficiency, low cost, simple process and no pollution on environment, and can improve the corrosion resistance of the Mg-Li alloy and widen the application range of the Mg-Li alloy.
Owner:HARBIN ENG UNIV

Copper alloy passivation solution and passivation layer preparation method

The invention provides a copper alloy passivation solution and a passivation layer preparation method, and belongs to the field of metal material surface treatment. Each liter of the copper alloy passivation solution comprises 0.03-0.06mol of cerium nitrate, 0.005-0.007mol of ethyl orthosilicate, 1-3g of sulfuric acid, 3-6g of potassium biphthalate and 2-4g of citric acid; and a solvent is water. A passivation layer preparation method comprises the following steps: taking a copper alloy as a working electrode in a three-electrode system; putting the working electrode into the passivation solution; enabling the working electrode, a reference electrode and a counter electrode to form the conducing tri-electrode system; and carrying out anode oxidization on the working electrode under constant-current density to form the passivation layer. The passivation layer preparation method is simple and low in cost; and the prepared passivation layer can be applied to surface treatment of copper and a copper alloy product, so that the corrosion resistance of the copper alloy can be obviously improved, and the service life of the copper alloy is prolonged.
Owner:725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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