164 results about "Chromate free" patented technology

The invention relates to the technical field of metal surface anti-corrosion treatment, and provides an aluminum alloy chromate-free passivation treatment method and aluminum alloy chromate-free passivation treatment fluid thereof. The treatment fluid is composed of 0.5 to 10.0 g/L of titaniferous compounds, 0.1 to 8.0 g/L of zirconium salt, 0.1 to 10 g/L of fluoride, 0.5 to 20 g/L of oxidizing agents and 0.2 to 15 g/L of complexing agents, wherein the pH ranges from 3.6 to 4.5. Aluminum alloy is treated for 1 to 5 minutes at the room temperature in the chromate-free passivation treatment fluid, and then is subjected to chromate-free passive membrane sealing treatment for 60 seconds to 120 seconds at the room temperature in sealing treatment fluid composed of 1% to 15% of organosilane, 2% to 40% of water-soluble fluorocarbon emulsion and 65% to 97% of deionized water, so that a compound chromate-free passive membrane is formed on the surface of the aluminum alloy, and after the compound chromate-free passive membrane is dried, the compound chromate-free passive membrane with high corrosion resistance is obtained on the surface of the aluminum alloy and can be directly used as the terminal protection layer of the aluminum alloy; and the chromate-free passivation treatment fluid does not contain heavy metal ions such as chromium ions, and is non-toxic, harmless to human bodies or the environment, clean and friendly to the environment.

The chromate free corrosion resistant coating for a fastener contains corrosion inhibiting inorganic constituents, or a combination of inorganic and organic corrosion inhibiting constituents, suspended in a phenol-formaldehyde thermosetting resin. The coating material possesses high abrasion resistance, and provides good lubricity and relatively low friction, rendering it especially suited for use with interference-fit fasteners.

The invention discloses a chromate-free passivation agent for an aluminum alloy. Per liter of chromate-free passivation agent is composed of, by mass, 10 mg to 300 mg of amino silane or/and epoxy silane, 1 mg-100 mg of dispersible nano particles, 10 mg-500 mg of a zirconium compound or/and a titanium compound, 1 mg-150 mg of metal ions, 10 mg-150 mg of fluoride, 1 mg-20 mg of a complexing agent, 75 mg-100 mg of organic phosphoric acid and the balance water; and the organic phosphoric acid is at least two of HEDP, HPMA, EDTMP, DTPMP, ATMP and PBTCA. According to the passivation agent, multiple kinds of organic phosphoric acid, multiple kinds of metal ions and multiple kinds of nano particles are chelated to the different degrees; on one aspect, the thickness and the compactness of a passivation film layer can be strengthened; and meanwhile, the passivation film layer (inorganic film layer) formed after chelation can show a color to a certain degree on the surface of the aluminum alloy.

The invention provides a compound chromate-free passivator capable of forming films rapidly. The compound chromate-free passivator comprises water-dilutable resin, silicon dioxide, a surfactant, a corrosion inhibitor, an accelerant and water. The chromate-free passivator provided by the invention does not contain poisonous and harmful ingredients such as heavy metal, sodium nitrite, phosphoric acid and the like, is environment-friendly, pollution-free and clean in production, and is close to passivation effect of hexavalent chromate in the aspect of comprehensive performance such as corrosionresistance and reprocessing; and the passivator sufficiently utilizes the diversity of organic high-molecular polymers and the rapid forming characteristic of inorganic salt, so that a high-performance resin and zirconium-based oxide layer compound coating can be provided for metal surfaces, compound passivation film provides a double protection function for protection of metal surfaces, and the organic coating has a clear advantage of delaying initial-stage corrosion on the metal surfaces, so as to ensure that the metal surfaces have excellent corrosion resistance and then the adhesive forceof coating is improved.

The invention provides a chromate-free passivator. The chromate-free passivator comprises the following components in a percent by weight: 77.3-93.8% of water, 5.0-20.0% of water-soluble resin, 0.1-1.0% of a coupling agent, 0.2-0.5% of a nanometer inorganic material, 0.5-1.0% of a complexing agent and 0.1-0.5% of an accelerant. When the chromate-free passivator provided by the invention is applied to the passivation of an aluminum or aluminum alloy surface, an obtained passivating film has excellent corrosion resistance and excellent bonding capability with a paint film and a powdery coating on the surface of a base material. Experimental results show that the corrosion resistance of the aluminum or aluminum alloy surface which is treated by using the chromate-free passivator is improved, the passivating film can resist salt mist for more than 72 hours, the wet film adhesion force of the paint film is improved, pressure cooker boiling can be withstood for more than two hours, and the quality of the formed film cannot be affected by environmental factors. The operation is simple, and the chromate-free passivator is suitable for site use.

A novel chromate-free multi-layer coating system composed of a lithium-doped potassium silicate binder based basecoat composition that is sealed with an aluminum phosphate-based top coat composition is described. The multi-layer coating system exhibits superior corrosion and heat oxidation resistance which can replace traditional chromate-containing coating systems.

Chromate-free and metal phosphate free treatments and compositions for applying a conversion or passivation coating for metals, more particularly, steel, zinc coated steel, and aluminum surfaces. The methods of the invention comprise contacting the requisite metal surface with a treatment composition comprising a member or members comprising one or more Group IV B elements, fluoride, and phosphonic acid or phosphonate. Optionally, a silane may be added as a treatment component.

Chromate-free corrosion-inhibiting coating compositions comprising film-forming binders and galvanic aluminum alloy powders prepared in an oxygen (oxidizing), nitrogen (inert) or nitrogen-hydrogen (reducing) atmosphere having particle sizes ranging up to 100 microns. The aluminum alloy powders having the formula: aluminum-zinc-X (AlZnX) wherein X is an element selected from the group consisting of indium, gallium, tin and bismuth. Improvement in corrosion protection is obtained by the addition of chemical inhibitors such as an azole or talcite clay to the coating which further inhibits the self-corrosion of the aluminum alloy and extends the corrosion protection of the metal substrate being protected.

An aluminium alloy chromate-free overall agent compatibility treatment and wastewater zero discharge system comprises an agent compatible system and a series-opposing water-saving system, wherein the agent compatible system consists of a 1# deburring and degreasing bath and a 7# chromate-free passivation bath; the series-opposing water-saving system consists of a water washing compatible subsystem provided with not less than three non-mobile water washing baths, and an agent recycling subsystem provided with not less than one non-mobile water washing bath; the 1# deburring and degreasing bath, the water washing compatible subsystem and the agent recycling subsystem are in series-opposing arrangement on the whole, and a water inlet is formed in the starting end in the water flowing direction and connected with a water inflow channel by a water inflow control valve; and the 7# chromate-free passivation bath is arranged between the water washing compatible subsystem and the agent recycling subsystem. Due to the configuration of washing water series-opposing connection and agent retention and recycling on the basis of agent compatibility, the wastewater zero-discharge water-saving system is realized.

The invention discloses a chromate-free passivation solution for stainless steel, and relates to a passivation solution. The chromate-free passivation solution for the stainless steel is specifically prepared from molybdate, tungstate, gallotannic acid, phytic acid, a silane coupling agent, a rare-earth sulfate, nano-modified packing, auxiliaries and water. The prepared passivation solution has the characteristics of being environmentally friendly, free of strong pungent odor and nontoxic, harm to personnel and the environment can be obviously reduced, the production cost is effectively reduced, and compared with similar products, the passivation speed of the chromate-free passivation solution is increased by about 35%; and the stainless steel treated with the chromate-free passivation solution is more excellent in corrosion resistance and high in use value.

A waterborne corrosion resistant primer composition is composed of a waterborne resin system; an optional curing agent; and a non-chromate containing corrosion inhibiting additive. The non-chromate corrosion inhibiting additive includes at least one of an anodic corrosion inhibitor, a cathodic corrosion inhibitor and a metal complexing agent. The metal complexing agent increases the solubility of at least one of the anodic and cathodic corrosion inhibitors.

The present invention provides an aqueous binder composition for chromate-free metal surface treatment agents that have excellent coatability and liquid stability and are capable of forming a surface treatment film having excellent corrosion resistance, adhesiveness and electrical conductivity. This aqueous binder composition for metal surface treatment agents contains: a reaction product of a silane coupling agent containing an amino group and a silane coupling agent containing an epoxy group, or a reaction product of the above-described silane coupling agents and an alkoxysilane compound such as trialkoxysilane wherein a hydrocarbon group such as an alkyl group is directly bonded to a silicon atom; a specific acid compound; and water.

Disclosed is a chromate-free passivation treatment process for aluminum profile material. The chromate-free passivation treatment process specifically comprises the steps of ash removal, deslagging rinsing, oil removal degreasing, activation degreasing, rinsing, hot dip galvanizing, rinsing, chromate-free passivation and rinsing. The process is simple and orderly. Degreasing and galvanizing are added based on a traditional process, so that the life of the profile material is prolonged, and the surface strength of the profile material is increased; the profile material is oxidation-resistant for a long time; meanwhile, a layer of thin film is formed on the surface of the profile material, and the thin film protects the surface of the profile material effectively, so that the profile material is oxidation-resistant and corrosion-resistant. The process makes the chromate-free passivation treatment on the profile material more perfect.

A chromate-free metal surface treating agent which is well adapted for use with a metal-coated steel material is provided. This agent provides excellent workability, adhesion, and corrosion resistance when used as a pretreatment before providing an overcoat, for example, by applying a coating composition. A steel material which has been treated with such surface treating agent, and a method for treating a metal surface with such surface treating agent, as well as a coated steel material having an overcoat formed on the surface treated steel material, and its production method are also provided. The metal surface treating agent contains a compound which contains all of the following structures (a) to (c): (a) a straight chain and/or branched organic polymer skeleton formed by carbon-carbon bond optionally containing nitrogen atom between the carbon-carbon bond; (b) a primary, secondary, or tertiary amino group; and (c) a silyl group having a hydrolyzable group and/or hydroxy group bonded by silicon-carbon bond in one molecule and/or its (partial) hydrolysis and condensation product as its critical component, and this critical component is dissolved in water and/or an organic solvent.

The invention provides a novel aluminum veneer pre-roll-coating production line and a process technology and relates to the technical field of machinery. A series of key technologies including alkaline washing, cleaning, passivation, coating, printing and drying are adopted, and a front conveying belt, an alkaline washing machine, a cleaning machine, a chromate-free passivation device, a baking oven, a precise single-roller priming paint coating machine, a far infrared baking oven, a three-roller coating machine, a far infrared device, a multi-color stereoscopic printing machine, a far infrared machine, a precise single-roller priming paint coating machine, a curing baking oven and a rear conveying belt are sequentially placed to form the novel aluminum veneer pre-roll-coating production line. The process technology is that an aluminum veneer pre-roll-coating product is manufactured through feeding, alkaline washing, cleaning, passivation, air-drying, priming paint roll-coating, far-infrared heating and curing, finishing coat roll-coating, secondary far-infrared heating and curing, multi-color printing, third far-infrared heating and curing, varnish roll-coating, heating and drying and film coating and off-line operation. The novel aluminum veneer pre-roll-coating production line and the process technology are used for aluminum veneer roll-coating and are novel in concept, reasonable in design, simple and ingenious in structure, stable and reliable in effect and low in cost and facilitating manufacture, usage and popularization.

Disclosed is a chromate-free resin composite damping material having a multilayer structure wherein a viscoelastic resin composition is interposed, as an intermediate layer, between metal plates. This chromate-free resin composite damping material is characterized in that (i) the viscoelastic resin composition is a thermosetting resin composed of an amorphous copolymerized polyester resin and a curing agent, and in that (ii) a chromate-free adhesive foundation film composed of 5-50% by mass of silica, 5-50% by mass of a polyester resin, 1-50% by mass of tannic acid and 0-30% by mass of a silane coupling agent is arranged on a metal plate surface which is in contact with the viscoelastic resin composition. This chromate-free resin composite damping material is excellent in durable adhesion.

The invention discloses a chromate-free passivation method for a chemically-plated Ni-P coating. The method comprises the following treatment steps of (1) preparing a chromate-free passivation solution, and sequentially adding 3-20g/L of sodium hydroxide, 1-10g/L of sodium carbonate, 10-60g/L of molybdate, 2-25g/L of film forming accelerant and 2-15g/L of buffering agent in distilled water; (2) carrying out chemical nickel plating on a substrate to be subjected to nickel plating; and (3) after ending the nickel plating operation, immediately cleaning a nickel-plated piece and carrying out passivation treatment on the nickel-plated piece, washing the nickel-plated piece twice after ending the treatment, and drying by blowing or baking. Through the passivation treatment, a layer of transparent passivation film can be formed on the surface of the Ni-P coating, so that the appearance of the coating is not influenced, and the anti-tarnish property and corrosion resistance of the coating are remarkably improved. Elements such as O, C, Ni and Mo can be detected in the passivation film. The chromate-free passivation method is relatively simple in process, simple and convenient to operate, low in cost, chromate-free, environment-friendly and capable of easily realizing industrialization.

The present invention provides a colored and coated chromate-free metal sheet which has, formed on at least one surface of a metal sheet, a colored coating film (alpha) that comprises a film-forming component comprising a polyurethane resin (A1) containing a urea group, a urethane group and a carboxyl group, a coloring pigment (B) and spherical silica particles (C) having an average particle diameter of 5-50 nm, wherein the polyurethane resin (A1) contains structural units each derived from a polyester polyol component (a) having an aromatic ring structure and structural units each derived from an isocyanate component (b) having an aromatic ring structure, each of the structural units derived from the isocyanate component (b) contains an aromatic ring structure, and the colored coating film (alpha) has a thickness of 2-10 mum, and wherein the metal sheet has excellent chemical resistance.

The invention relates to a vacuum coating production process of an automobile hub with high physical and chemical properties. The production process comprises the following steps: (1) processing a hub blank; (2) inspecting and polishing the hub blank; (3) removing oil; (4) cleaning and drying; (5) carrying out pre-treatment; (6) spraying body powder and curing; (7) polishing; (8) spraying medium powder and curing; (9) vacuum coating: spraying a metal coating on the treated hub in a vacuum chamber according to a vacuum sputter coating principle; (10) preparing a transparent coating; and (11) finally inspecting and packaging, wherein the passivation coating is a chromate-free passivation coating and the metal coating is an aluminum film. According to the production process provided by the invention, the surface evenness and the corrosion resistance of the hub are improved, the evenness, the gloss, the hardness and the corrosion resistance of the surface of the hub are increased, the surface of the hub is sealed and metallized, and the hub has glossiness of water electroplating. The transparent coating has an adhesive force of a high vacuum coating. The production process provided by the invention is concise and low in energy consumption, and the prepared hub is high in hardness and strong in corrosion resistance.

The invention discloses a chromate-free metal composite tanning agent, comprising the following ingredients: 27.5-37.5 wt% of tetravalent zircon salt, 2.0-5.0 wt% of trivalent aluminium salt, 2.5-10.0 wt% of 15-45 wt% tetravalent titanium salt, 2.5-7.5 wt% of La-Ce mixed chlorinated rare earth, 0-2.5 wt% of antifreezing agent, and 55-60 wt% of water, wherein, the tetravalent zircon salt is selected from zirconium sulfate, zirconium nitrate or zirconium chloride, the trivalent aluminium salt is selected from aluminium sulfate, aluminium chloride, aluminum potassium sulfate or aluminium ammonium sulfate, the tetravalent titanium salt is selected from titanyl sulfate, titanium sulfate or ammonium titanyl sulfate complex salt, the antifreezing agent is glycol, and the water is deionized water. The invention also discloses a preparation method of the chrome-free metal composite tanning agent. The chrome-free metal composite tanning agent has the advantages of good comprehensive properties, simple production technology, and environmentally friendly; and the preparation method is simple without special devices.

The present invention provides a chromate-free coating composition having excellent corrosion resistance. The coating composition includes a binder system comprising a resin and a pigment system including a metal alloy pigment component and optionally, a carbonaceous component. Coated articles with the coating composition applied to at least a portion of a surface thereof are also provided.

Disclosed are fastener inserts for preventing galvanic corrosion in fastener assemblies by coating fastener inserts with a resin bonded chromate free fluoropolymer composition having an average viscosity of between about 20 to 30 seconds at 25° C. Also disclosed is a method for providing coated inserts as well as the coated inserts produced.