233results about How to "Uniform corrosion" patented technology

The invention discloses a biodegradable medical magnesium alloy which consists of the following matters in percentage by weight: 1.0-3.0% of Zn, 0.20-1.50% of Y, 0.40-1.50% of Nd, 0.30-0.50% of Zr and the balance of Mg and inevitable impurity elements. Meanwhile, the invention discloses a preparation method of the alloy. The magnesium alloy is smelted to prepare common magnesium alloy. The use level of Zn, Y and Nd in furnace burden is 1.2-1.4 times the content of Zn, Y and Nd in the magnesium alloy, and the use level of Zr is 2-2.5 times the content of Zr in the magnesium alloy. According to the invention, the magnesium alloy overcomes the problems of cytotoxicity, excessively high corrosion rate and the like by adding rare earth elements Y, Nd and Zr into a magnesium-zinc alloy, and the potential difference with a matrix is reduced due to a lot of uniformly dispersed and distributed nano MgZn particle phases in the matrix by extrusion and processing, so that the corrosion resistance of the alloy is greatly improved, and the alloy has better mechanical properties.

The invention relates to an anti-explosion material, which is made of a cut and extended aluminum alloy foil mesh and has mesh-like or beehive-like porous structure, and is characterized in that: an aluminum alloy foil comprises the following chemical components in percentage by weight: 0.05 to 0.15 percent of silicon, 1.0 to 1.6 percent of copper, 0.2 to 0.5 percent of manganese, 1.0 to 3.0 percent of magnesium, 3.0 to 6.0 percent of zinc, 0.02 to 0.06 percent of titanium, 0.05 to 0.15 percent of zirconium, 0.1 to 0.3 percent of scandium and the balance of aluminum. Meanwhile, the invention also discloses a manufacturing method of the anti-explosion material. The material obtained by the method has the advantages of high electric and heat conductivities and large specific area and has the characteristics of corrosion resistance and high strength. When used as an anti-explosion material, the material is free from scraps and deformation. The material is particularly suitable for safe protection of containers for flammable and combustible liquid containers with high corrosivity as well as skid-mounted gasoline and gas filling station containers.

The invention provides an aluminum alloy electrode material. The aluminum alloy electrode material comprises 0.1-3 wt% of Mg, 0.05-1 wt% of Sn, 0.01-0.5 wt% of Ga, 0.02-0.1 wt% of RE and the balance Al. According to the aluminum alloy electrode material, an aluminum substrate is doped with a certain amount of magnesium, stannum, gallium and the rare earth element, on the basis of improving the activity of an aluminum anode, through the refining function of the rear earth element on grains, corrosion of the aluminum anode is evener, and the corrosion rate is lowered; meanwhile on the one hand, due to addition of the elements, the electrochemical performance of the aluminum alloy is good; on the other hand, the added elements are free of contamination; and the rare earth element is added in the form of an aluminum rare earth master alloy, and the price is low. The invention further provides a preparation method of the aluminum alloy electrode material and application of the aluminum alloy electrode material in air batteries.

The present invention relates to Co-base alloy, especially, an anticorrosive and antiwear cast Co-base alloy. The alloy consists of C 1.0-2.5 wt%, Cr 20-35 wt%, W 5-20 wt%, Mo 1-6 wt%, Nb 1-8 wt%, Cu0.5-2.0 wt%, Si 0.5-3.0 wt%, Ni 2-15 wt% and Co 35-65 wt%. It has excellent anticorrosive performance and average hardness of about 48 HRC, and may be used in making cutter of water flow type chemical fiber cutting machine. Substituting partial Co with Ni can reduce the cost of the alloy.

The invention relates to a bentonite-loaded sulfurized nanoscale zero-valent iron composite material and a preparation method and application thereof. According to the composite material, sulfurized modified nanoscale zero-valent iron is loaded on bentonite; the mass ratio of bentonite to total iron is (0.85-1.2):1, and the molar ratio of a sulfur element to total iron is (0.05-0.065):1. The bentonite-loaded sulfurized nanoscale zero-valent iron composite material is more stable and efficient, and is suitable for treatment of multiple pollutants; electron transfer on the surface of the nanoscale zero-valent iron can be accelerated through sulfurized modification and corrosion is promoted, thereby greatly improving the reaction activity of the material; furthermore, the sulfuration process is simple and is free of pollution; and the material is not easy to reunite when loaded on bentonite and the activity can be kept for a long period of time. The removal rate of the material on 4-nitrophenol within 2min reaches over 97.5%, and the removal rate on orange I is close to 100%.

The invention discloses a method for preparing a three-dimensional fluid channel in a transparent material. The complex three-dimensional fluid channel is prepared inside the transparent material by utilizing femtosecond lasers of circular polarization. The three-dimensional fluid channel prepared by the method disclosed by the invention has the advantages of same anisotropic etch rate and faster etch rate for a complex structure.

The invention provides a salt spray test device with constant temperature and constant humidity. The salt spray test device comprises a box body, a test cabinet, a humidifier, a cooling device, a heater, an evaporator, a water tank, a circumfluence device and a salt spray generator. The salt spray test device is reasonable in design; firstly the salt spray generator is matched with the circumfluence device, so that the salt spray can integrally and equably etch a solid-shaped object, and the whole device has a structure required by constant temperature and humidity, so that the corrosion test condition is set in a needed scene, and the test condition is more approximate to the real environment. In addition, the salt spray test device also has a favorable drainage and overflowing structure, the device use safety is ensured, and the salt spray test device has excellent capability of saving the salt spray.

The invention relates to a medical Mg-Gd-Zn (-Ca) magnesium alloy with an LPSO structure and a preparation method of the medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure and belongs to the field of medical magnesium alloy preparation. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure comprises, by mass, 1.0%-3.5% of Gd, 0.3%-1.2% of Zn and 0-1.0% of Ca. The preparation method of the medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure comprises the steps that raw materials which are in an appropriate ratio are placed in a crucible containing mixed protective gases of CO2 and SF6 in sequence for melting, stirring, standing and casting, wherein during casting, the solidification rate is controlled; and a cast ingot is placed in a resistance furnace with a protective atmosphere for heat treatment, and then rod materials are formed through extrusion. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure has the advantages that the contents of the Gd element and the Zn element are low, the biological safety is high, the cost is low, and the technology is simple. Cast alloy tissue and extrusion alloy tissue both have the LPSO structure. Besides, after Ca is added, a divorced eutectic (Mg, Zn, Ca) 3Gd phase is formed in the cast alloy and is beneficial for the abrasion resistance performance of the alloy, the microstructure is adjustable, and the corrosion resistance of a material can be effectively improved. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure has broad application prospect in the biomedical fields of orthopedics and cardiovascular stent implantation.

The invention discloses a silicon slice thinning method based on metal nano particle catalysis in the technical field of microelectronics. The method comprises the following steps of: pretreating a silicon slice (100) or (111) at normal temperature by using acetone, a CP4-A solution and hydrofluoric acid so as to obtain a clean silicon surface; and preparing a thinning solution which is formed byuniformly mixing silver nitrate, hydrogen peroxide and hydrofluoric acid, putting the thinning solution into a water bath for preheating, immersing the silicon slice into the thinning solution, and thus obtaining an ultrathin silicon slice with a required thickness by controlling reaction time, temperature and a solution ratio. In the method, the silicon slice can be uniformly etched by using a metal nano particle catalysis characteristic at the first time; a silicon slice thinning process is simplified by using a one-step method; characteristics of wet etching at near normal temperature and normal pressure can be retained, so the ultrathin silicon slice with the thickness of less than 50 microns can be obtained; furthermore, an application range of metal nano particle catalysis silicon etching is expanded; and a new idea and a new technical measure can be supplied to the silicon slice thinning process.

A high-potential Mg alloy used as consumable anode for the underground oil or gas pipeline, storage tank and water pipe is prepared through micro-alloying the Mg-Mn alloy by Mg-Ca and Mg-RE intermediate alloys, and refining by use of special refining agent to obtain Mg MnRECa alloy, which contains proportionally Mn, Ce, Ca, Si, Cu, Ni, Fe and Mg. Its advantages are high open-circuit potential 1.7-1.8 (-V) and high current efficiency (55-60%).

The invention belongs to the technical field of weather-resistant steel surface pretreatment, relates to corrosion of weathering steel materials in an atmospheric environment, in particular to a stabilizer for promoting the formation of a weather-resistant steel rust layer and a preparation method of the weather-resistant steel rust layer. The stabilizer comprises the following components of, nanoalpha-FeOOH, nano gamma-FeOOH, nano Fe3O4, CuSO4, Cr2(SO4)3, water-based acrylic acid and water; the nano alpha-FeOOH, the nano gamma-FeOOH, the nano Fe3O4, the CuSO4 and the Cr2(SO4)3 are uniformlydispersed in an aqueous acrylic acid aqueous solution; and the nano alpha-FeOOH, the nano gamma-FeOOH and the nano Fe3O4 can induce rust layer nucleation, meanwhile, the surface of the weather-resistant steel can be uniformly corroded in the service process through the characteristics of the water-permeable and oxygen-permeable stabilizer coating, and meanwhile, uniform corrosion causes uniform shedding of the rust layer stabilizer, so that the color of the weather-resistant steel structure is more uniform.

The disclosed technique is applicable to thinning down silicon flexible substrate of having oxidation buried layer. Substrate material capable of coordinating mismatched strain is provided for epitaxial growth with large mismatch. The etching technique includes following steps: (1) carrying out degreasing treatment for chip with silicon flexible substrate, cleaning by deionized water, rinsing in diluent hydrofluoric acid, and carrying out ultrathin etching process; (2) first, carrying out acid etching; (3) then, carrying out alkali etching. The invention reaches purpose of uniform etching by using steps of first acid etching and then alkali etching.

The invention relates to a biodegradable hydroxylapatite-magnesium and calcium metallic matrix composite, belonging to the field of biomedical materials. The material of the invention is composed of the composite of magnesium-calcium alloy and hydroxylapatite particles, the components and mass percent thereof are: 0.01-5% of Ca, 0-1% of Zn and Mg as the balance; the mass ratio of the hydroxylapatite to magnesium-calcium alloy is 0.01-50:100. In the invention, powder metallurgic method is adopted. The material matrix of the invention has close bonding with strengthened nano particles which areevenly distributed. The composite of the invention can be biologically degradable and has fine mechanical property and biological activity, and wide application prospect in medical material field such as repairing impairment of scaffold for bone tissue engineering, fixed fasteners within bones and weight-bearing parts of bones.

The invention discloses an absorbable iron-based alloy stent, comprising an iron-based alloy substrate and a degradable polyester in contact with the surface of the substrate, in which the degradable polyester has a weight average molecular weight of between 20,000 and 1,000,000 and a polydispersity index of between 1.2 and 30. With the degradable polyester, the iron-based alloy is capable of corroding rapidly and controllably within a predetermined period. Following implantation into the human body, the degradable stent serves as a mechanical support at early stage, then gradually degrading and being metabolized and absorbed by the human body. During the process of degradation, minimal or no solid product is produced. Ultimately, the configuration of the lumen with an implanted stent as well as the systolic and diastolic functions thereof return to their natural states.

The invention relates to an adjustment method of magnetic field intensity of a magnetron, wherein the magnetron comprises a plurality of magnet assemblies arranged successively. Each magnet assembly comprises a magnet, and an upper cover and a lower cover which are arranged respectively on upper end surface and lower end surface of the magnet. The adjustment method includes a step of, with maintenance of constant total height of each magnet assembly, changing the heights of the magnet, the upper cover and the lower cover of the each magnet assembly in a to-be-adjusted zone in the magnetron, or changing proportion of the heights of any two of the three heights in the total height of the total height of the magnet assembly, so that the magnetic field intensity in the to-be-adjusted zone in the magnetron is enhanced or weakened. By means of the adjustment method, a uniform magnetic field intensity in all zones in an upper surface of a target material can be obtained, and further particles can bombard the target material uniformly during a magnetron sputtering deposition technology process, so that the target material is uniformly corroded during the technology process, thereby increasing utilization rate of the target material and achieving a better uniformity of a thin film deposited onto a to-be-processed workpiece.

The invention discloses a quartz crystal wafer corrosion machine which comprises a box body, wherein the box body is internally provided with a corrosion liquid pool and a cleaning pool; an automatic cleaning swing mechanism is arranged on a table board between the corrosion liquid pool and the cleaning pool; the upper end of a support arm of the automatic cleaning swing mechanism is connected with a crossbeam through a rotating shaft; the front end of the crossbeam is connected with a cleaning frame for placing a wafer basket; the crossbeam is internally provided with a driving gear and a driven gear which are meshed with each other; the driving gear is connected with a driving motor output shaft on the crossbeam; the driven gear is connected with the cleaning frame; and a corrosion liquid spray head which is connected with the corrosion liquid pool and a cleaning liquid spray head which is connected with the cleaning pool are respectively arranged above the corrosion liquid pool and the cleaning pool. According to the quartz crystal wafer corrosion machine, the automatic cleaning swing mechanism is arranged, so that the cleaning frame is capable of driving the wafer basket to alternate between the corrosion liquid pool and the cleaning pool and automatically rotates 360 DEG, the cleaning and the corrosion are more even, the manual operation is replaced, the work efficiency is improved and the labor intensity of the workers is reduced.

The invention discloses a chip mesa etching device, which mainly includes a spacer and a chip frame; the spacer takes a shape of round slice; the chip frame includes baffles, a locking device, a rotation device and a fixed frame; the baffles are positioned at the both sides of the chip frame, the outsides of the baffles are connected with the locking device, the locking device can inwardly extrude the baffles, then the spacer and a chip which are arranged between the baffles can be clamped tightly by the baffles, the rotating device is sheathed at the outside of the locking device, the locking device is embedded and sheathed in the side surface of the fixed frame and is connected with the side surface, the locking device and the rotation device extend to the outside from both sides of the side surface of the fixed frame. The invention eliminates the coating of a chip protective coating layer and solves the problems of complicated process procedure and the long time of the traditional method. Furthermore, the invention has simple operation, can load dozens of chips at one time, as well as carry out the corrosion simultaneously and greatly improve the working efficiency.

This invention puts forward a MgMn dry battery, in which, the anode is highly pure Mg alloy with a bulk drum shell applying thermal extrusion forming and low resistance processed paper membrane. The main performance indication is much higher than that of the same type of ZnMn dry batteries, the uniform working voltage is 0.3-0.4v higher than that of ZnMn batteries suitable for large current discharge.