964 results about "Chromium free" patented technology

The invention relates to a passivating solution which is aqueous solution containing water-soluble molybdic compound, boric acid, water-soluble organic matter and silica sol, wherein the water-soluble organic matter is a mixture of alcohol and organic carboxylic acid. The invention also provides a surface treatment method for a galvanized material, which comprises the following step: enabling the passivating solution to be in contact with a galvanized material. A galvanized layer can be passivated by the contact between the passivating solution and the galvanized material so as to enable the galvanized material to have excellent corrosion resistance. In addition, the paint composition is chromium free and meets the requirements of a RoHS instruction.

The invention discloses a corrosion-resistant magnesium aluminum alloy chromium-free passivation solution, which comprises the following components: 10-40 parts of water-base resin, 1-10 parts of nanoparticle sol, 1-10 parts of fluoric-containing acid, 1-5 parts of fluoric acid-containing salt, 1-5 parts of a rare earth catalyst, 1-10 parts of a silane coupling agent, 1-5 parts of a corrosion inhibitor, 1-2 parts of a complexing agent and 40-70% of water. The corrosion-resistant magnesium aluminum alloy chromium-free passivation solution does not contain chromium and other toxic and harmful substances, meets the ROHS environmental protection law of the European Union, and meanwhile, can form an organic and inorganic composite passivation film and a thin film on the surface of a magnesium aluminum layer, and the formed composite passivation film has an excellent physical property and corrosion resistance, and has higher corrosion resistance and long salt fog time, so that the corrosion resistance of a magnesium aluminum alloy plate is better improved.

The invention in particular relates to passivation solution without chrome which is used for galvanized sheets and a method thereof. The technical scheme thereof comprises: firstly, dissolving inorganic salt corrosion inhibitor, then, adding the inorganic salt corrosion inhibitor into a stirred tank, adding dispersant, organic acid, sealant, silicone-acrylate emulsion and water while stirring, then, using inorganic acid or alkali to regulate the pH value to be 2.0-5.0, and then stirring for 1-2 hours under the condition that the temperature is 20-30 DEG C, the content of the components of each liter is: the inorganic salt corrosion inhibitor 10-55g, additive 4-10g, the organic acid 5-20g, the sealant 5-30g, the silicone-acrylate emulsion 150-300g, and the rest is the water. The method of the invention can additionally form a layer of organic resin separate layer on the basis of forming an inorganic metal compound precipitation film, additionally, since the silicon compound is added, not only the binding force between a passivation layer and zinc coating can be increased, but also the corrosion resistance, the scrubbing resistance and the wear resistance of the passivation layer can be increased, and the coating treatment after passivation can not be affected.

A pickling solution for the surface pre-treatment of plastic surfaces in preparation for metallization, the solution comprising a source of Mn(VII) ions; and an inorganic acid; wherein the pickling solution is substantially free of chromium (VI) ions, alkali ions, and alkaline-earth ions.

The invention relates to an environment-friendly double-component epoxy anticorrosion primer without containing heavy metals such as chromium and the like. The primer is prepared from components A and B, wherein the component A contains bisphenol A epoxy resin, active dilute, tinting pigment, antirust pigment, filler, auxiliary agent, mixed solvent and the like; and the component A is a curing agent component and contains two cashew nut shell modified phenolic aldehyde amine curing agents with different amine values and a mixed solvent. During use, the components A and B are mixed in a weightratio of 5 to 1. The anticorrosion primer does not contain the heavy metals such as chromium and the like, and meanwhile has excellent anticorrosion performance, physical and mechanical properties, salt mist resistance and acid and alkali resistance. The primer is particularly suitable for coating steel materials, aluminum materials, aluminum alloy and the like, and can be used as a surface anticorrosion primer for airplanes, rapid trains and the like with high anticorrosion requirements. The primer can be normally constructed even at the low temperature of 5 DEG C below zero, and has excellent matching property with finishing paint.

The invention discloses water-based chrome-free Dacromet coating solution. The coating solution is environment-friendly, is free of environmental pollution and simultaneously has good corrosion and weather resistance. The coating solution comprises components A, components B, a component C and components D, wherein the components A include 18-24% of zinc powder, 2-5% of aluminium powder, 28-34% of wetting and dispersing agent, 1-3% of passivator, 1-3% of corrosion inhibitor and water by mass; the components B include 5-12% of film-forming agent, 0.1-0.5% of forming auxiliaries and water by mass; the component C is 5-12% of film-forming auxiliary by mass; the components D include the balance of thickener and water; and the total mass percent of water is 18-27%.

The invention relates to a chromium-free zinc aluminum anticorrosive paint and a preparation method. The invention adopts the technical scheme that the preparation method comprises the following steps of: stirring 5 to 25 weight percent of flake zinc powder and 5 to 15 weight percent of flake aluminum powder uniformly, adding 25 to 40 weight percent of organic solvent, 1.1 to 1.8 weight percent of dispersant, 3 to 8 weight percent of corrosion inhibitor and 3 to 10 weight percent of inorganic additive into the powder, and stirring the mixture for 20 to 40 minutes to form a base material; and then stirring 5 to 15 weight percent of modified resin, 1 to 3 weight percent of organic silane coupling agent and 25 to 30 weight percent of organic solvent uniformly, and adding the mixture into the base material; or stirring the mixture for 30 to 50 minutes to obtain the chromium-free zinc aluminum anticorrosive paint; or stirring the mixture for 30 to 50 minutes, adding 0.05 to 0.5 weight percent of hydroxyethyl cellulose into the mixture, and stirring the mixture for 20 to 50 minutes to obtain the chromium-free zinc aluminum anticorrosive paint. The preparation method has the characteristics of environment friendliness, low energy consumption and low cost; and a coating coated by the prepared chromium-free zinc aluminum anticorrosive paint has high impact strength, good corrosion resistance, strong bonding force and high hardness.

The invention relates to the field of aluminum alloy decoration and protection coating for ships, in particular relates to an environmentally-friendly corrosion-contamination resistant chemical conversion agent and application thereof in a chromium-free chemical conversion film, and solves the problems of poor corrosion resistance, high cost, difficulty in large-area construction and the like in the prior art. The chemical conversion agent comprises a component A and a component B. The method for preparing a chemical conversion film comprises the following steps of: forming a first inorganic chemical conversion film layer by the component A and forming an organic contamination resistant closed film by the component B. The component A is a water solution prepared from a main salt, a film-forming accelerator, a buffering agent, a surfactant and the like, and the component B is prepared from silicate, silane, a silica sol, titanate, zirconate, waterborne resins and the like. The chemicalconversion agent does not contain chromium ions and phosphates, and the chromium-free chemical conversion film prepared from the chemical conversion agent has excellent corrosion resistance and contamination resistance, can be used for construction of large-area aluminum alloy sections, and can be used as surface decoration and protection coatings for 5xxx and 6xxx series aluminum alloys.

The invention relates to a chromium-free composite passivator for a hot-dip galvanized steel sheet. The passivator is prepared from the following raw materials in percentage by weight: 2.20-2.30% of water-base resin, 2.60-2.65% of main salt compound, 0.10-0.15% of organic silane, 0.07-0.09% of sulfate, 0.11-0.13% of inorganic zircon salt, 0.09-0.12% of inorganic acid and the balance of water. A preparation method of the passivator comprises the following steps: firstly, dissolving the organic silane in water; stirring till the organic silane is fully dissolved and adding the main salt compound; after the main salt compound is dissolved, adding the inorganic acid to measure the pH value; then, adding the sulfate and the inorganic zircon salt in the stirring state; after the sulfate and the inorganic zircon salt are fully dissolved, adding the water-base resin; stirring till the water-base resin is fully dissolved; adjusting the pH value to 3-4 by virtue of ammonium water; and standing for later use. An application method of the passivator comprises the following steps: firstly, degreasing the hot-dip galvanized steel sheet by virtue of an alkaline degreaser during use; then, respectively washing by using tap water and deionized water; and after drying, coating the composite passivator on the surface of the hot-dip galvanized steel sheet. The passivator provided by the invention is free from chromium and non-toxic and harmless. The thickness of a passivation film can reach 8-1.0mg/m<2>, and the corrosion resistance is close to that of a hexavalent chromium passivating liquid.

The present invention discloses a chromium-free passivation liquid for treating a tin-plated steel plate, wherein the pH value of the chromium-free passivation liquid is 3-4. The chromium-free passivation liquid comprises an inorganic compound containing at least one selected from silicon, titanium and zirconium, a metal compound containing at least one selected from aluminum, vanadium, manganese, cobalt, nickel and molybdenum, a soluble resin, an acid for adjusting the pH value of the passivation liquid to 3-4, and the balance of water and other unavoidable impurities, wherein the contents of silicon, titanium and zirconium are 0.1-20 g/L, the contents of aluminum, vanadium, manganese, cobalt, nickel and molybdenum are 0.1-20 g/L, and the soluble resin content is 0.1-20 g/L. The tin-plated steel plate treated by the chromium-free passivation liquid obtained with the technical scheme has characteristics of excellent corrosion resistance, excellent sulfurization resistance, excellent coating material adhesion and excellent processability.

Chromium-free coating composition with anti-corrosion and anti-fingerprint properties, particularly suitable for metal alloys, especially galvanized steel, and coated articles. Composition comprises aqueous-resin emulsion, hazardous air pollutant-free co-solvent, organo-functional silane, metal chelating agent, and chromium-free corrosion inhibitor, and optionally pH adjusting agent.

A surface treatment for metal materials obtained by incorporating an anionic water-dispersible resin (A) having a glass transition temperature of 0 DEG C or above and at least one member (B) selected from the group consisting of alkali metal silicates and basic zirconium compounds in water, wherein the alkali metal silicates have M2O/SiO2 mass ratios of 1/1000 to 6/10 with M being at least one element selected from the group consisting of lithium, sodium and potassium; a surface treatment process; and surface-treated metal materials. The invention provides a chromium-free surface treatment for metal materials which is useful for imparting excellent corrosion resistance, chemical resistance, thermal discoloration resistance and weather resistance to metal materials. Additional incorporation of one or more members selected from among silane coupling agents, vanadium compounds, titanium compounds, organophosphonic acids, polyhydric alcohol phosphates, inorganic acids, salts thereof, metal fluorides, and metal oxides brings about further improvement in the performance of the treatment.

The present invention discloses a graphene-modified chromium-free Dacromet coating material, which comprises, by weight, 10-20% of zinc powder, 2-10% of aluminum powder, 2-20% of a film forming agent, 40-60.8% of a solvent, 0.1-5% of an auxiliary agent, 0.001-20% of graphene, and 0.1-5% of a filler. According to the present invention, compared with the traditional Dacromet coating, the graphene-modified chromium-free Dacromet coating material of the present invention provides substantially-increased hardness and substantially-increased adhesion, wherein the hardness of the coating of the present invention can be 7H so as to make the coating have good wear performance; the energy consumption is reduced, the conductivity of the coating is increased, and the corrosion resistance of the chromium-free Dacromet coating material is further increased; and the used raw materials do not contain substances harmful for environment and human body so as to fundamentally eliminate the pollution source.

The invention discloses a steel mill continuous annealing galvanized sheet chromium-free compound passivator which comprises the following raw materials in percentage by weight: 5-20 percent by weight of a main film-forming agent, 0.1-5 percent by weight of a coupling agent, 0.1-0.5 percent by weight of inorganic complex film-forming agent, 0.1-4 percent by weight of silicate, 0.1-0.4 percent of an emulsifying agent, 0.1-0.2 percent of a dispersing agent, 0.1-0.4 percent of a corrosion inhibitor, 0.1-0.3 percent of a protective colloid, 0.1-1 percent of a nanometer sealing agent, 0.1-0.4 percent of phosphate and the balance of water. The steel mill continuous annealing galvanized sheet chromium-free compound passivator disclosed by the invention is uniform in appearance, stabilizes a liquid, has an expiration date of above 90 days, is nontoxic and environment-friendly, and accords with the ROHS (Restriction Of Hazardous Substances) requirement. The steel mill continuous annealing galvanized sheet chromium-free compound passivator is simple in preparation process; a passivated film is uniform in appearance and has certain glossness. A galvanized sheet passivated by using the passivator has the advantages that the corrosion resistance is remarkably improved, the neutral salt mist SST (Sea Surface Temperature) resistant time reaches above 72 hours, the white rust area is less than 5 percent, the blackening resistance delta E is less than 5, the yellowing resistance delta E is less than 3, the alkaline resistance delta E is less than 3, the interlamination resistance R is less than 3 omega/cm, and the conductivity is less than 1 m Omega.

The invention relates to the field of aluminum alloy decoration and protection coatings for ships, in particular to an aluminum alloy scratch resistant and fingerprint resistant chromium-free chemical conversion solution for a ship and application of the aluminum alloy scratch resistant and fingerprint resistant chromium-free chemical conversion solution to a chemical conversion film. The chemical conversion solution contains titanium salts, zirconium salts, a silicon compound, an accelerator, a surfactant and the balance water, wherein the concentration of the titanium salts in the chromium-free chemical conversion solution ranges from 0.02 to 10g/L; the concentration of the zirconium salts in the chromium-free chemical conversion solution ranges from 0.1-10 g/L; the concentration of thesilicon compound in the chromium-free chemical conversion solution ranges from 2 to 25g/L; the concentration of the accelerator in the chromium-free chemical conversion solution ranges from 0.5-12 g/L; and the concentration of the surfactant in the chemical conversion solution ranges 0.1 to 10g/L. Chemical conversion films are formed on the surfaces of 5xxx or 6xxx series aluminum alloys by adopting an impregnating, brush coating, roller coating or spraying mode; and the chemical conversion films have favorable corrosion resistance, scratch resistance and fingerprint resistance and can be used as the surface decoration and protection coating of the aluminum alloy for the ship.

The present invention relates to surface treatment of aluminum alloy, and especially a kind of chromium-free chemical aluminum alloy converting solution capable of endowing aluminum alloy surface with excellent corrosion resistance and its usage. The chromium-free chemical aluminum alloy converting solution consists of silicate, titanium salt, peroxide, fluoride, and water solution of sulfuric acid. The solution is used in 50-99 deg.c and pH 4-9 and has aluminum alloy contacting time of 2-20 min. The solution contains no hexavalent chromium and potassium ferricyanate, and has less environmental pollution, low cost, easy filming and high corrosion resistance.

A high-temperature annealing treatment resistant single-component chromium-free aqueous silicon steel sheet insulated masking liquid is characterized in that the main ingredients include organic resin, inorganic water dispersion liquid, curing agent and other additives. The weight ratio of the components is as follows: 100 parts of the organic resin, 100-400 parts of inorganic matter, 5-30 parts of the curing agent, 1-20 parts of additive surface active agent and the rest of water, and the solid content of the masking liquid is 30-50 percent. The masking liquid does not contain toxic organic solvent and chromate, has excellent performances of coating appearance, adhesion, salt spray resistance, insulativity and the like, and can still keep good insulativity after going through high-temperature stress annealing process. After a high-temperature annealing experiment (nitrogen atmosphere, 750 DEG C/2h), the interface resistance retention value is more than 70 percent. The curing speed of the masking liquid is fast, the curing is thorough, and the surface of the membranous layer does not turn sticky for a long time of placement after curing. The masking liquid is in the form of single component, has convenient use and can be stored for long time.

The invention relates to a non-chromate Dacromet paint belonging to the metal anticorrosion technical field. The non-chromate Dacromet paint is prepared by the following steps that: after mixing a component B with a component C based on the weight ratio of 3-5:1.5-2.4, mixing the mixture with a component A based on the weight ratio of 1:16-32, stirring evenly and controlling pH value between 3.5 and 5.5; the non-chromate Dacromet paint has the characteristics of non-environmental pollution and non-public nuisance, high permeability, high adhesion, high antifriction, high weatherability, high chemical stability and so on. And the anticorrosion of the non-chromate Dacromet paint improves 7-10 folds of zinc electroplating.

The invention discloses an aluminium alloy chromium-free passivating agent. The aluminium alloy chromium-free passivating agent comprises fluotitanic acid, fluozirconic acid, a corrosion inhibitor and a chelating agent, wherein the concentrations of the fluotitanic acid and the fluozirconic acid (50wt.%) are 2.0-3.0g/L, the concentration of the corrosion inhibitor is 4.0-6.0g/L, and the concentration of the chelating agent is 6.0-8.0g/L. The aluminium alloy chromium-free passivating agent has the advantages that the pollution of chromium salt to water is completely eliminated from the source; the aluminium solving amount is reduced, powder applied to the surface of the aluminum alloy is reduced, and the service life of passivating liquid is prolonged; the passivation speed of the passivating agent is more than three times of that of chromium salt, and the production efficiency is improved. Meanwhile, the invention discloses an aluminium alloy chromium-free passivating treatment system. The aluminium alloy chromium-free passivating treatment system is simple to operate, energy-saving and environmentally-friendly, can be used for easily treating wastewater and facilitates large-scale production. The aluminium alloy chromium-free passivating treatment system is used for completely avoiding chromium pollution generated in processes of treating surfaces of building aluminium profiles, using the building aluminium profiles and treating wasted building aluminium profiles and solving the bottleneck problem of restricting the development of industries.

The invention relates to a cation-nonionic mixed aqueous polyurethane emulsion and a preparation method thereof. The emulsion is aqueous polyurethane which has a cation hydrophilic group and a nonionic hydrophilic side chain. The preparation method comprises the steps of firstly introducing the nonionic hydrophilic side chain by using a specific nonionic hydrophilic chain extender; and introducing the cation hydrophilic group by using a cation hydrophilic chain extender, wherein the amounts of the nonionic hydrophilic chain extender and the cation hydrophilic chain extender respectively account for 1-10 percent and 1-8 percent according to the total weight of the raw materials, and the specific nonionic hydrophilic chain extender is 3-(N,N-dihydroxyethyl) amino-propionic acid polyethyleneglycol monomethyl ether ester which is prepared by heating and reacting methoxy polyethylene glycol single methyl acrylate and diethanol amine in a molar ratio of 1:1. By using the emulsion, the defect of the existing emulsion is overcome, and the requirement of zinc-plating steel plate chromium-free passivation pretreatment on aqueous polyurethane resins are met, so that the cost is reduced.

The invention relates to a chromium-free, corrosion prevention treatment for steel, zinc or zinc alloys, aluminum, magnesium or alloys thereof in which the metal surfaces are contacted in a first step with a first aqueous solution having a pH of 1.5 to 5 which contains Ti and/or Zr and/or Si ions and at least such a quantity of fluoride that the atomic ratio of Ti to F and/or Zr to F and/or Si to F is in the range from 1:1 to 1:6 and then, optionally after rinsing with water, and thereafter in a second step are contacted with a second aqueous solution having a pH of 1.5 to 5 which contains Ti and/or Zr and/or Si ions and at least such a quantity of fluoride that the atomic ratio of Ti to F and/or Zr to F and/or Si to F is in the range from 1:1 to 1:6, and which additionally contains such a quantity of soluble anions of oxo acids of Mo (VI) and/or W (VI) that the total concentration of molybdenum and/or tungsten is in the range from 5 to 1500 mg/l.

The invention discloses a batch hot-dip galvanizing chromium-free passivator and an application method thereof. According to the invention, toxic and harmful hexavalent chromium and trivalent chromium used in a traditional passivation process are replaced with an organic film-former, so that a chromium-free passivator which does not contain chromates, can be used at room temperature, is low in cost, good in corrosion resistance and easy to use, and can be practically applied to industrial production is provided for passivation treatment in the batch hot-dip galvanizing industry. The chromium-free passivator mainly comprises an organic film-former, an organic corrosion inhibitor, an oxidant, a surfactant and water. The chromium-free passivator disclosed by the invention is easy to use and simple in operation, and has no change in existing processes.

Provided is a chromium-free metal surface treatment agent excellent in rust inhibitive performance which can be used in a surface treatment of metal products, in particular, galvanized metal products. The metal surface treatment agent consists essentially of a siliceous binder solution comprising water and/or alcohol as a solvent, and the concentration of the silica component is 8 to 25% by weight. In particular, a metal surface treatment agent containing an alcoholic solution of alkoxysilane oligomer having a weight averaged molecular weight of 1000 to 10000, which is obtained by hydrolyzed condensation polymerization of alkoxysilane, can suppress the occurrence of white rusting for a long time. It is preferred that 3 to 25 parts by weight of a dispersed nano-sized titanium dioxide powder having an average primary particle size of not more than 70 nm, per 100 parts by weight of the silica component be suspended in the siliceous binder solution. The rust inhibitive performance of the metal surface treatment agent can be further improved by using an alcohol-soluble polyvinyl butyral resin and by adding a silane coupling agent having a vinyl or epoxy group as a functional group, in combination with a dispersed nano-sized powder of titanium dioxide.

The invention relates to a chromium-free passivation solution and a hot-dip galvanized metal material. The chromium-free passivation solution is prepared from a raw material mixture through uniform mixing. The raw material mixture contains one or more silane coupling agents and water. The chromium-free passivation solution is characterized in that the raw material mixture also contains one or more titanium compounds, one or more inorganic silicon compounds, one or more water-soluble film-forming agents and tannic acid or phytic acid, wherein the one or more titanium compounds are selected from hexafluorotitanic acid, ammonium hexafluorotitanate, potassium hexafluorotitanate, metatitanic acid and titanyl sulfate and the one or more inorganic silicon compounds are selected from nanoscale silica powder, silica sol and sodium silicate. The chromium-free passivation solution has good corrosion resistance, good water resistance, good heat resistance, good fingerprint resistance and excellent roller coating performances. A passivation method adopting the chromium-free passivation solution can greatly shorten treatment time, can be utilized for passivation plate production in a spray mode or a roller coating mode, and also can avoid an oiling process in galvanized plate production.

The invention relates to the technical field of metal passivators, and particularly relates to a chromium-free composite passivator and a preparation method thereof. The chromium-free composite passivator provided by the invention is prepared from the following components in percentage by mass: 3.0-10% of gamma-methylacryloyloxytrimethoxy silane, 0.1-3.0% of sodium molybdate, 0.1-5.0% of cerium chloride, 0.5-4.0% of phosphoric acid, 0.5-4.0% of acetic acid, 15-20% of water-soluble epoxy resin, 5-15% of water-soluble acrylic resin, 10-30% of water and 20-40% of ethanol. The chromium-free composite passivator is suitable for treating steel, zinc and zinc alloy, or aluminum and aluminum alloy. The chromium-free composite passivator contains the water-soluble high-molecular resins and inorganic corrosion inhibitor, and is mixed with ethanol to form a colorless, innoxious, environment-friendly, transparent and clear solution. At room temperature, the chromium-free composite passivator is applied on the surface of steel, hot-galvanized zinc and zinc alloy, or aluminum and aluminum alloy to generate chemical crosslinking reaction, and is cured to form a film.