45results about "Metallic material coating processes" patented technology

A trivalent chromium multicolored passivator belongs to the technical field of surface treatment. This passivating agent is used for trivalent chromium multicolored passivating agent after passivation treatment after various electroplating galvanizing processes, and hexavalent chromium will not appear during use. It can prevent the aging of the passivation film and last for a long time through the detection by boiling method. Time to keep the passivation film bright, excellent corrosion resistance. The passivating agent is composed of: 15-30% trivalent chromium composite main salt, 10-25% composite chelating agent, 3-8% reducing agent, 3-10% salt spray resistance additive, 1-3% surfactant, etc. , and the balance is composed of water.

The invention provides an organic and inorganic composite aluminium alloy non-chromium passivation treatment fluid, pertains to the field of metal materials, relates to a problem of treatment of metal material surface, and in particular to a passivation treatment fluid which can improve the corrosion resistance of the aluminium alloy surface and does not contain hexavalent chromium. The passivation treatment fluid is characterized in that organic resin such as waterborne acrylic resin, polyurethane or the like is adopted as a film forming agent, and a ferrate inorganic passivating agent, a stabilizing agent and a curing agent are added to prepare an organic and inorganic composite passivation solution; the concentration weight percentages of the components in the passivation solution are as follows: 10 to 25 percent of organic resin film forming agent of waterborne acrylic resin or polyurethane, 0.01 to 2 percent of ferrate inorganic passivating agent, 0.05 to 5 percent of sodium silicate passivation solution stabilizing agent, and 0 to 5 percent of curing agent; phosphoric acid is used for adjusting the pH value to 4-6; and the balance is deionized water. The method of roll coating, dip coating or the like is adopted for evenly coating the passivation solution on the surface of the aluminium alloy, then non-chromium passivation film with good corrosion resistance is obtained after curing at the temperature above 80 DEG C, and the passivation solution meets the requirement of environment protection.

A discharge surface-treatment method includes generating a pulse-like discharge by using a green compact of metal powder, a metal compound powder, or a ceramic powder as an electrode and applying a voltage equal to or greater than 500 volts between the electrode and a workpiece in a gas atmosphere; and forming a coating consisting of an electrode material or a substance resulting from a reaction of the electrode material to the energy of the pulse-like discharge on a surface of the workpiece with an energy of the pulse-like discharge.

The invention relate to a surface depositing method for improving aluminum alloy welding joint strength, and belongs to the technical field of material welding. The method comprises the following steps: carrying out surface treatment on a welded joint of a welding workpiece to remove greasy dirt and an oxidizing layer close to the welding line; carrying out surface treatment by adopting a chemical method and a mechanical method; depositing a to-be-deposited area of the welding joint; and after deposition, grinding the surface of the welding joint by a steel wire brush to remove the blacken area on the surface to realize the first depositing. According to the method, the tensile strength of the welding joint is improved by 20-30% through CMT or laser deposition of the metal welding joint.

The invention discloses a laser composite additive manufacturing method for controlling flowing of a molten pool based on pulse laser, and belongs to the field of laser advanced additive manufacturing. The laser composite additive manufacturing method comprises the steps that continuous laser beams are used for melting the surface of a base material and alloy powder, pulse laser beams are introduced to conduct synchronous impact treatment on the molten pool while the molten pool is formed, and the laser composite additive manufacturing process of controlling the molten pool through the pulse laser is executed; and in the manufacturing process, the morphology and flowing of the molten pool are controlled through the pulse laser beams, the flatness of a cladding surface is improved, the residual stress in a cladding layer is adjusted, and the anisotropy of the performance of the cladding layer is reduced. The forming quality and residual stress of the cladding layer are improved, meanwhile, the flatness and mechanical performance of the cladding layer are improved, the production efficiency can be improved, the method is suitable for continuous multi-lap-joint or multi-layer stacked laser additive manufacturing work, and the method is suitable for the field of laser additive manufacturing of surface remanufacturing repair or 3D printing direct forming.

The invention discloses a forging method of a driving shaft for a gearbox. The forging method of the driving shaft for the gearbox comprises the following steps: a step a of pouring a cylindrical blank material, wherein the cylindrical blank material comprises chemical components, by weight percent: no smaller than 0.096% but no greater than 0.150% of C, no smaller than 2.1% but no greater than 2.40% of Si, no smaller than 1.1% but no greater than 1.30% of Mn, no smaller than trace amountbut no greater than 0.033% of P, no smaller than trace amount but no greater than 0.0260% of S, 0.11-0.22% of Ni, no smaller than 8.50% but no greater than 11.50% of Cr, no smaller than trace amount but no greater than 0.018% of B, and the balance of Fe and inevitable included impurities; and the step a comprises the following steps: decreasing the temperature of blank bodies shaped in a pouring way to 350 DEG C, then heating the blank bodies to 670 to 760 DEG C for 3-5h heat preservation, cooling the blank bodies in a furnace to 300 DEG C for 4h heat preservation, reheating the blank bodies to 650 to 760 DEG C for 17h heat preservation, cooling the blank bodies to 400 DEG C at a speed of 50 DEG C per hour and finally cooling the blank bodies to 140 DEG C at a speed of 20 DEG C per hour; and a step b of forging, wherein the step b comprises the following steps: a step 1 of selectively using 30-diameter round steel and cutting by using a shearing machine, wherein the length of a sheared rough blank piece is 70.3mm; and a step 2 of putting the rough blank piece of the step 1 in an intermediate frequency heating furnace for heating at a heating temperature of 1120 to 1180 DEG C and keeping the heating for 3.6min. The forging method of the driving shaft for the gearbox is beneficial to the large-batch industrial production of the driving shaft for the gearbox; and moreover, the phenomena of dirt inclusion and impossible fullness occurring during the forging process are reduced, the mechanical performance of a product is further improved, the product material is saved and the service life of a die for the product is prolonged.

The invention provides an aluminum profile chromate-free passivation agent. The chromate-free passivation treatment agent includes, by weight percent, one or more of hexafluorozirconic acid, hexafluorotitanic acid, zirconium tetrafluoride, potassium fluozirconate and fluosilicic acid, water soluble phenolic resin, carboxymethyl cellulose, a silane coupling agent, sodium nitrate, an alkaline adjusting agent, a rare earth additive, an auxiliary and deionized water. The auxiliary is one or more of a stabilizing agent, a pH adjusting agent, a thickening agent, a leveling agent, a coalescing agent, a wetting agent and an antioxidant. The metal surface treatment agent is used for treating a metal product, the antirust performance of the product can be obviously improved, especially, the surfaces of aluminum and aluminum alloy products can be treated.

The invention discloses a high adhesiveness fingerprint-resisting hot galvanized steel plate and a production method thereof. The high adhesiveness fingerprint-resisting hot galvanized steel plate comprises a first fingerprint-resisting agent layer, a first passivation liquid layer, a first zinc coating, a basal plate, a second zinc coating, a second passivation liquid layer and a second fingerprint-resisting agent layer which are all sequentially arranged layer by layer, wherein the materials of the first fingerprint-resisting agent layer and the second fingerprint-resisting agent layer are the same; the materials of the first passivation liquid layer and the second passivation liquid layer are the same; the materials of the first zinc coating and the second zinc coating are the same. The high adhesiveness fingerprint-resisting hot galvanized steel plate has excellent fingerprint-resisting adhesive force and malleability and has no desquamation; with adoption of a production method, the production efficiency of the high adhesiveness fingerprint-resisting hot galvanized steel plate is improved.

The invention relates to an aluminum alloy surface treating technology and particularly relates to an aluminum alloy surface titanium dioxide conversion coating solution and a using method thereof. The aluminum alloy surface titanium dioxide conversion coating solution is an aqueous solution which contains titanium salt and fluoride, and the pH value of the aqueous solution is regulated to 3.5-4.5 by using non-reducing acid. After being pretreated, the surface of aluminum alloy is soaked into the aluminum alloy surface titanium dioxide conversion coating solution for 1-15min, thus a conversion coating is formed on the surface of the aluminum alloy. According to the invention, the chemical conversion treatment is carried out by using titanium salt instead of chromic acid, the surface of the aluminum alloy is etched by using low-concentration fluorine ions, and titanyl sulfate or titanyl nitride is induced to hydrolyze to generate a titanium dioxide conversion coating on the surface of the aluminum alloy, wherein the titanium dioxide conversion coating is uniform in color and luster and excellent in corrosion resistance. The titanium salt is nonpoisonous, the conversion solution is simple in component, no great number of energy is consumed, and no environment hazards are caused, therefore, a clean production process is achieved.

Disclosed for use in treating a metal, e.g., an alloy of silver as aforesaid, is a water-based composition comprising a treatment agent selected from an alkanethiol, alkyl thioglycollate, dialkyl sulfide or dialkyl disulfide and at least one of an amphoteric, nonionic or cationic surfactant in a concentration that is effective to solubilise the treatment agent. Preferably the composition comprises at least a non-ionic relatively hydrophobic surfactant e.g. cocamide DEA. The composition is particularly suitable for the treatment of Ag—Cu—Ge alloys.

The invention relates to a plating layer for an electrochemistry corrosion resistant electronic encapsulation shell, which comprises the following step: sequentially plating an inert metal-plating layer, a ferronickel-plating layer, a nickel-plating layer and a gold-plating layer on a surface layer of a shell matrix and a surface layer of a lead from the inner part to the outer part, wherein the ferric content of the ferronickel-plating layer is from 15 to 65 percent by weight. The invention can prevent and retard the electrochemistry corrosion of the electronic encapsulation shell.

The invention discloses a powder cladding additive manufacturing based method for growing a complex structure on the surface of a cast and forged piece, and belongs to the technical field of metal forming and manufacturing. The method comprises the following steps of: designing a matrix structure part model according to a to-be-manufactured final part and manufacturing the matrix structure part; performing structural design on the surface of the matrix structure part model to obtain a three-dimensional model of the final part; and performing two-dimensional slicing treatment on the three-dimensional model, leading obtained parameters into a 3D printer, and using powder which is the same with the matrix structure part material to perform powder cladding type additive manufacturing on the surface of the matrix structure part through the 3D printer, thereby obtaining the final part. Compared with conventional casting, forging and machining, the method can prevent the cast and forged piecefrom a coarse structure and stress focus, also can avoid a low material utilization rate caused by forged part machining, and does not need to manufacture a dear powder metallurgic mould; and meanwhile, compared with pure 3D printing, the method is higher in production efficiency and is high in product qualification rate.

The invention provides a metal surface protection pre-processing process, which comprises the steps of: firstly, normally degreasing metal workpieces once, then washing by water twice; sand-papering; degreasing and washing by water; coating a silane solution; curing; and coating. The metal workpieces are processed by the process; polyacid film layers are formed on the workpiece surfaces; and the polyacid film layers are dense and uniform and have strong adhesion force with metal bodies, so that the polyacid film layers do not easily drop, and the metal protection efficiency is improved. At the same time, the operation process is environment-friendly and pollution-free.

The invention discloses stainless steel crucible paint used for smelting an aluminum-lithium alloy as well as a preparation method thereof and a coating method thereof. In raw materials of stainless steel crucible paint, a binder accounts for 40-60% of all components, wherein aggregates are Y2O3 powder with grain size of 800-1000 meshes. The preparation method comprises the following steps: (1) uniformly mixing Al(OH)3 and MgO, adding water and phosphoric acid, and stirring to heat to a temperature of 50-80 DEG C; (2) adding aluminum powder, CrO3, zinc chrome and Y2O3 powder, and uniformly stirring; and (3) performing ball-milling mixing. The coating method comprises the following steps: grinding the inner surface of a stainless steel crucible, and heating the inner surface to a temperature of 70-90 DEG C; spraying paint to the inner surface of the crucible by a spray gun, heating up to a temperature of 800-850 DEG C to preserve heat after air-drying, and cooling along with a furnace.The paint disclosed by the invention has good thermal shock property and good chemical stability.

The present invention provides a sealing liquid which does not contain a nickel salt but is capable of achieving a sealing performance equivalent to that in cases where a sealing liquid containing a nickel salt is used, and which enables an anodic oxide coating film sealed therewith to exhibit excellent contamination resistance. The present invention provides a sealing liquid for anodic oxide coating films of aluminum alloys, which contains a metal salt, a pH buffering agent and a surfactant, and which is characterized in that the metal salt is at least one salt selected from among alkali metal salts and alkaline earth metal salts.

The invention discloses laser cladding coating powder and a preparation method. The laser cladding coating powder comprises the following compositions in percentage by mass: 97-99wt.% of iron-based composite powder (90% of Fe901 and 10% of WC) and 1-3 wt.% of CeO2 powder. The preparation method comprises the following steps: metallic matrix selection and pretreatment, powder matching and ball grinding, synchronous powder feeding, laser cladding, and generation of Fe-based composite coating taking Cr23C6 and WC as reinforcing phases on the surface of the metallic matrix. A laser cladding layeris excellently combined with the matrix and higher in hardness and has excellent oxidization resistance and high temperature wear resistance.

The invention discloses a preparation method of a phosphatization liquid for steel pipe cold-rolling processing pre-treatment. The phosphatization liquid comprises 22-26g/L of zinc oxide, 84-88g/L of phosphoric acid having a concentration of 85%, 16-20g/L of zinc dihydrogen phosphate, 22-26g/L of monocalcium phosphate, 6-8g/L of nickel sulfate, 4-6g/L of magnesium sulfate, 10-12g/L of tartrate, 4-6g/L of sodium citrate, 12-14ml/L of hydrogen peroxide and the balance water. The preparation method comprises the following steps of 1, mixing zinc oxide and water to obtain paste and carrying out stirring to obtain a uniform mixture, 2, slowly adding phosphoric acid into the zinc oxide paste with stirring until dissolution, 3, orderly adding zinc dihydrogen phosphate, monocalcium phosphate, nickel sulfate, magnesium sulfate, tartrate, sodium citrate and hydrogen peroxide into the solution obtained by the step 2 and carrying out stirring until dissolution, and 4, adding the rest of water into the solution obtained by the step 3 to adjust free acidity to 12-15 and total acidity to 70-90.

The invention discloses an alloy powder for plasma cladding. The alloy powder for plasma cladding is mainly composed of, by mass, 51%-65% of chromium, 0%-15% of vanadium, 8.1%-9% of carbon, 6.1%-8% ofboron, 0%-6% of cobalt, 0%-12% of tungsten carbide and the balance Fe and unavoidable impurities. The alloy powder for plasma cladding is especially suitable for plasma cladding of wear-resistant parts, and a cladding layer is high in hardness, good in wear resistance, small in cracking tendency and good in plasma cladding technology performance.

The invention relates to the preparation of an ultra-hydrophobic surface, in particular to a method for preparing an aluminum-based ultra-hydrophobic surface with the condensing droplet self-bouncingcharacteristic. A washed aluminum substrate is subjected to anodic oxidation treatment in electrolyte, removed out, soaked in excessive ethanol solution containing perfluorinated silane, removed again, and then heated, and after cooling, the aluminum-based ultra-hydrophobic surface with the condensing droplet self-bouncing characteristic can be obtained on the aluminum substrate. The method is simple and easy to operate, does not require expensive equipment, has high processing efficiency, and has no environmental harm in the reagents used, the prepared ultra-hydrophobic surface is expected tobe used in the fields such as metal anti-corrosion, anti-frost, anti-ice, enhanced condensation heat transfer and self cleaning.

An object of the present, invention is to provide a chemical conversion surface, treatment solution, that is capable of forming a chemical conversion film with excellent corrosion resistance and designability on articles having aluminum or aluminum alloy surfaces by using steps similar to those of known chemical conversion treatments without using hexavalent chromium, trivalent chromium, fluorine, or other components that create a significant burden on the environment. The present invention relates to a chemical conversion treatment solution for aluminum or aluminum alloys, comprising an alkaline aqueous solution containing a permanganic acid compound and at least one metal oxygen acid compound selected from the group consisting of vanadic acid compounds, molybdic acid compounds, tungstic acid compounds, zirconic acid compounds, and niobic acid compounds.