36results about How to "Does not contain easily decomposable ingredients" patented technology

A chemically transferred non-chromium Mg-alloy film is prepared through grinding said Mg-alloy, removing impurities, washing with alkali solution for defatting, washing with acidic solution for removing surfacial oxide, removing very thin oxidized film and pickling ash from its surface by fluoric acidic solution, immersing the Mg-alloy in filming solution to obtain phosphate film, and immersing in alkaline aqueous solution at 15-100 deg.C for 3-60 min for closing the pores in the film. Said filming solution is prepared from Mn salt, phosphate, fluoride and water.

The invention discloses a process for preparing compact magnesium oxide / hydroxyapatite nano fiber double-layer coating on the surface of a magnesium base. The process includes firstly preparing porous magnesium oxide coating containing phosphorus and calcium on the surface of magnesium or magnesium alloy by the microarc oxidation technique, namely utilizing phosphorus and calcium containing water solution as electrolyte, subjecting the magnesium or magnesium alloy to microarc oxidation treatment under high voltage by means of a direct-current pulse power source, and then subjecting the porous magnesium oxide coating containing phosphorus and calcium to hydro-thermal treatment in the specific hydro-thermal environment to obtain the magnesium oxide / hydroxyapatite nano fiber double-layer coating. The magnesium oxide / hydroxyapatite nano fiber double-layer coating obtained has the structure of an inner layer (adjacent to a basal body) composed of magnesium oxide and a small amount of magnesium hydrate and being compact and a surface layer formed by nano fiber hydroxyapatite layer, and has the advantages of high bonding strength, fine biological activity and capability of improving corrosion resistance of the magnesium and magnesium alloy in body fluid evidently. Besides, no discontinuous surfaces exist between the double-layer coating and the basal body.

The invention provides a preparation method of a thermal barrier coating on the surface of an aluminum-magnesium alloy and a composite material of the alloy. The preparation method is characterized in that the thermal barrier coating on the surface of the aluminum-magnesium alloy and the composite material of the alloy is prepared by carrying out electrolytic oxidation on the surface of the aluminum-magnesium alloy and the composite material of the alloy with a silicatic and phosphatic system plasma electrolyte to form a film medium, and carrying out electrophoretic deposition on the plasma electrolytic oxidation film (the film medium) with an electrophoretic deposition electrolyte. A plasma electrolytic oxidation-electrophoresis composite ceramic layer obtained with the preparation method of the invention, which has the advantages of smooth surface, firm combination, controllable thickness, densification and less aperture, good thermal insulation and thermal shock resistance, is suitable for workpieces with various dimensions and surfaces of complicated shapes.

The invention provides a titanium dioxide / strontium and fluorine-containing hydroxyapatite bioactive nano-composite coating as well as a preparation method and an application thereof. The method comprises the following steps: firstly preparing an electrolyte containing calcium ions, strontium ions, fluorine ions and phosphate anions; and then by taking titanium or a titanium alloy as an anode and stainless steel as a cathode, directly preparing the titanium dioxide / strontium and fluorine-containing hydroxyapatite bioactive nano-composite coating on the surface of a titanium or titanium alloy substrate by virtue of a micro-arc oxidation technology. The coating consists of an inner layer combined on the surface of the substrate and a surface layer combined on the surface of the inner layer, wherein the inner layer is a titanium dioxide layer in a form of a nano crystal and the surface layer is a nano-particle strontium and fluorine-containing hydroxyapatite layer. No non-continuous interfaces are available between the coating and the substrate and the coating has high combining strength and structural stable performance; the coating is relatively small in solubility in a simulated body fluid, so that the coating is effectively implanted and used; and the nano-particle strontium and fluorine-containing hydroxyapatite layer in the surface layer can remarkably promote the osteogenic function of the cells to form new bones and inhibit bacterial adhesion and growth.

The invention belongs to the technical field of titanium-based surface treatment, and specifically relates to a titanium-based surface multi-element co-doped hydroxyapatite nanorod array configurational coating, a preparation method and the application thereof. A micro-arc oxidation-hydrothermal treatment compound method is used, an HA nanorod array configurational coating in which three elementsof strontium, zinc and magnesium are doped is prepared on the surface of pure titanium, and co-doping of five elements such as Sr, Zn, Mg, Si and C of nanorod-like HA in a coating array is realized bycarrying out second hydrothermal treatment method on the coating. The preparation method is simple in technology and low in production cost, the obtained rod-like hydrothermal treatment gets closer to the bionic component of human bone, the coating can be quickly induced in an environment similar to a body fluid to form bone apatite, and the coating has good biological activity. The coating in combination with a micro-nano structure and biological activity elements preferably stimulates a synergetically enhanced biological effect, a novel design thought is provided for the surface modification of a metal implant, and the coating is significant for efficiently promoting osseointegration.

The invention discloses a preparation method of a 3D configuration high bonding strength sodium titanate nanofiber coating. Pure titanium sheets are used as a base material, and the surface is polished and smoothed, then cleaned and dried for use; an etching solution is prepared, Put the polished titanium sheet into the etching solution to etch, then wash and dry it for use; soak the obtained pure titanium sample in a concentration of 0.5mol L ‑1 ~1.0mol·L ‑1 In the NaOH solution of 220° C. to 230° C. under the condition of hydrothermal treatment for 2 to 17 hours, a sodium titanate nanofiber coating with high bonding strength can be obtained on the titanium surface. The invention realizes the construction of three-dimensional nanofiber coatings with different geometric configurations on the surface of titanium implants through a simple and easy hydrothermal method, and the construction of the coating is uniform on each surface immersed in the solution, without dead ends and shadowing site, and a gradient 3D coating that can be used to make special bone nails that penetrate cortical bone and cancellous bone can be obtained through the combined action of liquid and gas.

The present invention relates to magnesium alloy surface treating technology, and is especially chemical nickel plating process for magnesium alloy. The operation process includes the following steps: activating or finishing magnesium alloy through polishing or grinding, degreasing and acid pickling with acid fluoride bearing solution at 20-60 deg.c for 0.5-5 min; pre-treating with water solution containing fluoride bearing compound, iron bearing compound and complex at 15-45 deg.c for 5-30 min; and chemically nickel plating. The said process can make chemical nickel coating with homogeneous thickness, firm combination with substrate, high corrosion resistance and metal appearance. The process of the present invention has low cost and less environmental pollution and is suitable for industrial production.

The invention discloses a preparation technology of porous calcium gluconate tantalite / nono-funicular hydroxylapatite bioactive coating. The preparation technology comprises the following step of firstly preparing calcium and phosphorus-containing gluconate tantalite-based complex phase layer on the surface of tantalite by a micro arc oxidation technology, i.e. taking calcium and phosphorus-containing water solution as electrolyte, carrying out the micro arc oxidation treatment on the tantalum under high voltage by using a pulse power source, and carrying out the hydro-thermal treatment on the calcium and phosphorus-containing gluconate tantalite-based complex phase layer under a special hydro-thermal environment condition. The obtained coating with a double-layer structure has the following structure and performance characteristics: an inner layer (which is adjacent to a base body) is a gluconate tantalite-based complex phase layer which consists of gluconate tantalite, and a trace amount of antalum pentoxide and tantalum monoxide and is of a microporous structure in shape; and a surface layer is nono-funicular hydroxylapatite, which is inclined to or in parallel with the gluconate tantalite-based complex phase layer. No incontinuous interface exists between the coating with the double-layer structure and the base body, so that the coating is high in combining strength, and the osteolith can be quickly formed in the pseudo body fluid environment in an inducing way, so that the coating is good in biological activity.

The invention discloses a magnesium alloy with zinc and nickel compound plating layers and a preparation method thereof. A zinc plating layer of the magnesium alloy is taken as a bottom layer with the width between 20 microns and 25 microns, a nickel plating layer is taken as a surface layer, and the total width of the zinc plating layer and the nickel plating layer is less than or equal to 40 microns. The method comprises the following steps: firstly, plating preliminary treatment, i.e. zinc is activated in an acid solution and then soaked in sulphate; secondly, zinc electrodeposition, i.e. after the zinc is soaked in the sulphate in the first step, the zinc layer of the magnesium alloy is electrodeposited; thirdly, nickel bright plating, i.e. the magnesium alloy which is nicely processed in the second step is brightly plated with nickel in a nickel plating solution; fourthly, sodium silicate water solution sealing. With the method, the obtained zinc plating layer is nicely combined with a base body, has uniform width and high corrosion resistance, can be taken as a protective plating layer to be singly used and can be also taken as a transition layer to carry out plating or chemical plating or other protective or decorative platings, and the nickel plating layer obtained from the zinc plating layer by plating is nicely combined with the zinc plating layer and is uniform, exquisite, bright and beautiful.

The invention provides a titanium-based surface antibacterial and bone tissue regeneration induced functional coating as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly preparing an electrolyte, taking titanium or a titanium alloy as an anode and taking stainless steel as a cathode, preparing a porous TiO2 coating containing calcium, phosphorus and strontium by adopting a micro-arc oxidation technology, then sequentially performing hydro-thermal treatment by virtue of a fluorine-containing solution, and also loading human bone morphogenetic protein-2 to finally obtain a target coating disclosed by the invention, wherein the coating consists of an inner layer which is bonded on the surface of a matrix and a surface layer which is bonded on the surface of the inner layer, the inner layer is a porous TiO2 layer containing calcium, phosphorus and strontium, and the surface layer is a three-dimensional nano-fibrous hydroxyapatite layer which is loaded with human bone morphogenetic protein-2 and contains strontium and fluorine. No non-continuous interface is formed between the coating and the matrix, so that the coating provided by the invention has relatively good bonding strength and structure stability performance, also has good antibacterial and bone tissue regeneration inducing functions, and can be used for significantly promoting the osteogenic function of cells, promoting new bone formation and inhibiting the adhesion and growth of bacteria.

The invention discloses a zinc titanate-titanium oxide composite antibacterial coating on the surface of titanium and a preparation method of the zinc titanate-titanium oxide composite antibacterial coating and belongs to the technical field of titanium-based surface treatment. The preparation method comprises the steps that a combination solution of a (CH3COO)2Zn solution and a beta-C3H7Na2O6P solution serves as an electrolyte; and a metallic titanium sheet serves as the anode, stainless steel serves as the cathode, the metallic titanium sheet and the stainless steel are placed into the electrolyte, the metallic titanium sheet is treated through a micro-arc oxidation process, and the zinc titanate-titanium oxide composite antibacterial coating is prepared on the surface of the titanium sheet. According to the preparation method, raw materials are easy to obtained, operation is easy, control is easy, and the stability is good; and the antibacterial coating prepared through the preparation method has high biological activity as well as antibacterial property, no discontinuous interface exists between the antibacterial coating and a basal body, and high combination strength is achieved.

The invention discloses a preparation process of a tantalum surface strontium doped tantalum oxide nanorod structure bioactive coating. Firstly, an aqueous solution containing hydrofluoric acid, nitric acid and hydrogen peroxide is taken as a hydro-thermal solution, a tantalum matrix is subjected to hydro-thermal treatment under different hydro-thermal conditions, then the obtained tantalum oxidenanorod structure coating is subjected to hydro-thermal treatment again under the strontium-containing hydro-thermal environment condition, a microstructure of the obtained coating takes the shape ofa nanorod, the physical phase is tantalum pentoxide, the strontium element is doped in the nanorod structure coating, the bonding strength between the strontium doped nanorod structure coating and thematrix is high, the surface roughness of the obtained coating is relatively small, the precipitation of the strontium element from the coating shows the rule that the strontium element is precipitated fast firstly and then precipitated slowly, bone apatite is rapidly induced to be formed in the body-fluid-like environment, and the coating is excellent in bioactivity.

The invention discloses a nano-rod array structured coating with a titanium-based surface having both anti-oxidation and self-generating oxygen functions, a preparation method and an application thereof. Firstly, a porous titanium dioxide coating containing phosphorus and calcium was prepared on the surface of titanium or its alloys by micro-arc oxidation, and then a hydroxyapatite nanorod textured coating was grown in situ by hydrothermal treatment, and then polymer was prepared by oxidative self-polymerization. The dopamine-coated hydroxyapatite nanorod array is finally obtained by polydopamine adsorption of metal ions and hydrothermal method to obtain a biomedical material with both anti-oxidation and self-generating oxygen coating. The process of the invention is stable and controllable; the prepared coating surface has dual functions of anti-oxidation and self-generating oxygen at the same time; as an implant, it can regulate the bad bone microenvironment under the condition of RA, promote the healing and regeneration of bone tissue, Avoid the failure of the implant due to the poor bone microenvironment, the peeling of the coating induced by the poor membrane / base binding force, and the side effects such as osteolysis or excessive inflammation induced by it.

The invention relates to an environment-friendly magnesium alloy micro-arc oxidation electrolyte and a micro-arc oxidation method. The electrolyte includes: phytate or phytic acid 5g / L-20g / L, and one or more of the following substances: carbonate 5g / L-20g / L, silicate 5g / L-50g / L, boric acid Or borate 5g / L~50g / L, aluminate or aluminum hydroxide 5g / L~50g / L. It is operated according to the following steps: 1) Pretreatment: grinding, degreasing and pickling. 2) Micro-arc oxidation: In phytate (or phytic acid), add one or more substances of carbonate, silicate, boric acid or borate, aluminate (or aluminum hydroxide), and use alkali Metal hydroxide or ammonia water adjusts the pH value of the solution to 10-14, and then micro-arc oxidation. 3) post-processing. The anodic oxidation electrolytic solution used in the present invention does not contain Cr6+, F-, PO43-, even very little strong alkali is used, and there is no pollution to the environment. The obtained film layer has smooth surface, small hole diameter, good corrosion resistance and ceramic appearance. The raw materials of the method of the invention are easy to obtain and are suitable for industrial production.

The invention discloses a treating process and a treating device of a hydrofluoric acid corrosion resistant aluminum-plastic composite film. The treating process comprises the following steps: (1) removing oil from the bright surface of aluminum foil; (2) leaching the bright surface of the aluminum foil to remove alkali; (3) performing hydrofluoric acid treatment on the bright surface of the aluminum foil: leaching the bright surface of the aluminum foil with hot hydrofluoric acid water solution, and thus forming an aluminum fluoride salt conversion film under certain etching action generated by the strongly acid solution on the surface of the aluminum foil; (4) dipping with cold water; and (5) bonding the composite film: bonding a polypropylene film and the treated bright surface of the aluminum foil with an adhesive, so as to form a hydrofluoric acid resistant aluminum-plastic composite film. The treating fluid of the treating process of the hydrofluoric acid corrosion resistant aluminum-plastic composite film does not contain hexavalent chromium and has the advantages of environmental friendliness, high film-forming speed, simple process, uniformity of the film, strong corrosion resistance, little environmental pollution and low use cost, and additionally, the hydrofluoric acid resistant performance of aluminum-plastic composite materials can meet the requirements.

An aluminum alloy surface chemical method belongs to the fine chemical field. The treatment method is to put the aluminum alloy into the bath liquid containing potassium permanganate 0.01 to 10g / L, titanous sulfate 0.01 to 5g / L, wetter sodium dodecylbenzene sulfonate 0.1 to 10g / L, with the pH value being 1 to 4, and the temperature of 40 to 90DEG C to treat for 1 to 8 minutes, and then seal with boiled water for 20 to 30 minutes, and finally an even, fine golden conversion film with certain thickness is obtained on the surface of the aluminum alloy. The conversion film has excellent corrosion resistance performance. The invention can well solve the problems that products or emission during or after treatment of the current chromate solution to the aluminum alloy surface contain sexivalent chromium, which severely pollute the environment and harm the health of human body, etc; and the corrosion resistance of the invention is equal to that after treatment by the chromate solution.