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

The invention discloses a preparation method of an icing-resistant/ corrosion-resistant integrated functional super-hydrophobic coating for aviation. The method comprises the following steps: preprocessing titanium alloy, aluminum alloy and stainless steel to build a micro-nano structure; pre-spraying an adhering agent; continuously spraying a low-surface-energy nanometer powder coating; and curing to obtain the super-hydrophobic coating with outstanding icing resistance and corrosion resistance. According to the method, the prepared icing-resistant/ corrosion-resistant integrated functional super-hydrophobic coating for aviation is good in protection effect. The preparation method is simple in processes, and suitable for massive production; ideas are supplied to solve the problems that anair craft is easily iced and low in corrosion resistance; and the method has a wide application prospect.

The present invention discloses a preparation process of polyaniline anticorrosive coating, and includes the following steps: mixing epoxy rsin, polyaniline and diluent uniformly, grinding, then mixing them with phenol aldehide amine, polyamide and diluent uniformly according to the ratio of 10-20:1, cuating on the metal surface and solidifying at room temp. so as to implement said invention. Said anticorrosive coating can form a layer of compact film on the steel surface, can raise corrosion potential of steel, reduce corrosion current and can prevent and relieve corrosion of steel, and said coating layer possesses high harndess and excellent abrasive resistance, after said coating layer is scratched, a passive film can be formed so as to can protect metal from corrosion.

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.

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.

The invention relates to an improvement on a surface property of a proton exchange membrane fuel cell metal bipolar plate, which is characterized in that: a substrate surface is plated with a nickel layer and a Ni-Cu-P double-plating layer, wherein Ni-Cu-P adopts electroless deposition. The improvement not only greatly reduces contact resistance of the bipolar plate and a gas diffusion layer, but also improves corrosion resistant. Electrical conductivity and the corrosion resistance can basically reach the level of those of the stainless steel bipolar plate plated with precious metal. The improvement is simple in modification, low in cost and superior in performance after modification.

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.

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.

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.

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.

The invention discloses a boron-doping diamond film modification-based PEMFC (Proton Exchange Membrane Fuel Cell) bipolar plate and a preparation method thereof, belonging to the field of batteries. In the boron-doping diamond film modification-based PEMFC bipolar plate, after a stainless steel plate is subjected to surface pretreatment, a layer of TI film is sputtered on the stainless steel plate by using magnetron sputtering; a boron-doping diamond film is deposited on the TI film by using heat wire CVD (Chemical Vapor Deposition) equipment; and a diamond film and TI film compounded modification layer is formed on the surface of stainless steel. The stainless steel plate treated by the method has high corrosion resistance and a favorable conductive and heat-conducting property; and according to the stainless steel plate, the battery ratio power can be greatly improved and the PEMFC can achieve the aims of prolonging the service life and reducing the weight, the volume and the cost.

The invention relates a preparation process of a cerium-doped silicon corrosion-resisting membrane on a surface of aluminium alloy. The preparation process is characterized in that surface pretreatment is carried out on aluminium alloy, and then the aluminium alloy is immersed in cerium salt conversion liquid dissolved with organosilicon, so as to carry out membrane formation reaction on the surface of the aluminium alloy, thus the corrosion-resisting membrane is formed; and then the aluminium alloy is taken out, is cleaned by deionized water and is dried. The invention has the advantages that the process is simple, the membrane formation speed is rapid, the preparation time of the corrosion-resisting membrane is shortened, the main constituents of the corrosion-resisting membrane layer are cerium dioxide and hydrated cerium oxide, and the uniformity and compactness of the surface of the membrane are good. After the cerium-doped silicon corrosion-resisting membrane is formed on the surface of the aluminium alloy, the corrosion resistance of the aluminium alloy is improved remarkably.

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.

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.

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.

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.

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.

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.

The invention provides a coated piece which comprises an aluminum or aluminum alloy substrate, an amorphous alloy layer and a colored layer with an anti-corrosion function, wherein the amorphous alloy layer and the colored layer are formed on the aluminum or aluminum alloy substrate in turn; the amorphous alloy layer is Fe70Cr10B13X7; and X is any one selected from phosphorus, carbon and silicon. The coated piece has excellent corrosion resistance and decorative appearance. The invention also provides a manufacturing method for the coated piece.

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.

The invention discloses an environment-friendly polyaniline anti-corrosion and anti-shedding coating. The coating comprises a component A and a component B, wherein the weight ratio of the component A to the component B is (10 to 1)-(20 to 1); the component A is prepared from the following components: (1) 53g of liquid epoxy resin E56, (2) 6g of diethylene glycol dibenzoate, (3) 0.5g of OP-10, (4) 10g of n-amyl alcohol, (5) 3g of ammonium persulfate, (6) 1.5g of distilled water, (7) 1g of 0.4mol/L camphorsulfonic acid water solution, (8) 10g of aniline, (9) 0.5g of methyl silicone oil and (10) 7g of neopentyl glycol diglycidyl ether; the component B comprises the following components: 110g of liquid fatty polyamine, 30g of polyaniline, 5g of quartz sand, 10g of ethylene glycol phenyl ether, 5g of talcum powder and 5g of rosin glycerin ester. The coating has the advantages of high polyaniline content, good anti-corrosion property, no pollution, low cost, and the like.