39results about How to "Slow corrosion" patented technology

The invention belongs to the field of waste battery resource recycling, and discloses a leaching system and leaching method for valuable metal in a waste lithium battery. According to the leaching method, a sulfamic acid-glucose leaching agent is pre-heated, positive electrode powder is added, and stirring and leaching in a reaction kettle are performed, Co (III) and Mn (IV) are reduced to Co (II)and Mn (II) which are dissolved in a leaching liquid with Li<+> and Ni<2+>, Li, Co, Ni and Mn leaching rate in the waste battery positive electrode powder can reach 95% or above, and recycling or reusing of Li, Co, Ni and Mn can be achieved after further processing the leaching liquid. Compared with a traditional leaching liquid, the leaching system has the advantages of greenness, environmentalfriendliness, safe and controllable leaching process and relatively good industrial application prospect.

The invention provides a preparation method of a metal resin complex and the metal resin complex prepared thereby. The preparation method of the metal resin complex comprises the following steps: S1, anodic oxidation: a metal substrate with a surface comprising an anodic oxidation film layer is obtained by anodic oxidation of a pretreated metal substrate, and the metal substrate is an aluminum alloy substrate or aluminum substrate; S2, treatment with phosphoric acid: the metal substrate containing the anodic oxidation film layer and obtained by the step S1 is immersed in a phosphoric acid solution for treatment to obtain a surface treated metal substrate; and S3, injection: the surface of the surface treated metal substrate is injected with a resin composition, and then the metal resin complex is obtained after molding. In the metal resin complex, the binding force between metal and resin is strong, and the process is simple, is easy for large-scale production, and has no pollution.

The invention discloses an aluminium strip with tin soldering performance and high corrosion resistance and a preparation technology thereof. The aluminium strip can be widely applied to various fields of electrons, energy, precise instruments, automobiles and the like, and the problem that the aluminium strip is difficult to weld is solved. According to the aluminium strip and the preparation technology thereof, aluminium and aluminium alloy strips (aluminium strips for short) serve as a substrate; two surfaces of the substrate are successively electroplated with a copper coating, a nickel and cobalt alloy coating and a tin and nickel alloy coating; and multiple electroplated membranes and the substrate have the advantages of good bonding force, strong anticorrosion performance and better tin soldering performance. The aluminium strip prepared by the preparation technology can be produced by a continuous electroplating method so as to satisfy the requirement on aluminium strip surface treatment.

The invention provides a self-driven rotary aeration device which comprises a fixed air vertical pipe and a movable air vertical pipe, the fixed air vertical pipe and the movable air vertical pipe are connected through a rotary joint, inclined blades are arranged on the movable air vertical pipe, a rotary transverse pipe is arranged at the bottom end of the movable air vertical pipe, and air outlet holes are formed in the rotary transverse pipe. Compared with fixed aeration, rotary aeration has the advantages that the proportion of a bubble activity space in an aeration reactor in the whole space can be increased, uniform air distribution is promoted, uniform fluidization of the filler is promoted, the phenomena of filler accumulation or ball death and the like are prevented, and sludge sedimentation can also be prevented. Rotation of the rotating blades can also promote mixed contact of water, gas and microorganisms in the reactor, and mass transfer is enhanced.

The invention discloses a method for improving the welding performance of a copper surface heat sink for a packaging shell after gold plating. The method comprises the following steps of putting the shell into an alkaline oil removal solution to be cleaned; putting the shell into a pickling solution for cleaning; putting the shell into an etching solution for treatment; putting the shell into a pickling solution for cleaning; putting the shell into an activation solution for pre-plating activation; electroplating a layer of thin nickel on the surface of the shell; electroplating a layer of thick nickel on the surface of the shell; electroplating a layer of thick gold on the surface of the shell; and carrying out high-temperature drying treatment on the washed shell by using a high-temperature blast drying box. According to the invention, etching before plating is carried out on the copper surface heat sink for the packaging shell, etching liquid is corroded along a grain boundary, so that a lattice pattern shape is formed on the copper surface, and after nickel plating and gold plating are subsequently carried out on the basis, the welding performance and the welding yield of the surface of the copper surface heat sink are greatly improved; the etching solution corrodes along the grain boundary, other areas of the copper surface and other materials of the shell are not damaged,and the etching time range is large.

The invention discloses an efficient sterilization disinfectant and a preparation method thereof. With the aid of the efficient bactericidal performance of bromine and elemental iodine, an appropriateamount of a stabilizer, a surfactant and a synergist are added for preparation of the efficient sterilization disinfectant with the aid of coordination of a complexation method and a micellar solubilization method. The efficient sterilization disinfectant comprises the following main raw materials: the bromine, the surfactant, the stabilizer, the synergist and deionized water; or the bromine, theelemental iodine, the surfactant, the stabilizer, the synergist and the deionized water. The high-efficiency, broad-spectrum and safe compound disinfectant can quickly and thoroughly sterilize, has good stability, is strong in environmental protection property, has no stimulation, has high safety, and is suitable for long-term storage.

The invention relates to a heating device, in particular to a heating device for an electrochemical cleaning salt bath furnace heater in the foundry industry. The heating device comprises a shell with an open upper end and a closed lower end, and a heating core which comprises a ceramic bracket, a resistance band and two electrode connecting columns, wherein, the ceramic bracket extends into the shell and covers the opening on the upper end of the shell; the resistance band is arranged on the ceramic bracket and two upper ends of the band are bared outside the shell; and the two electrode connecting columns are respectively welded with the two upper ends of the resistance band. When in use, the heating device is directly placed in non-oxidizing molten salt in a tank body of the salt bath furnace. By utilizing the technical proposal, the resistance band of the heating core produces heat in the shell, and then the heat is diffused into the non-oxidizing molten salt outside the device through the shell so as to evenly heat the non-oxidizing molten salt. As the heating device is directly placed in the non-oxidizing molten salt in the tank body of the salt bath furnace by utilizing a built-in heating mode, the heating device has the advantages of fast heating speed and high heat efficiency so that the tank body of the salt bath furnace is evenly heated and has the characteristics of slow corrosion speed and long service life, thus finally achieving the purposes of higher cleaning efficiency and lower cleaning cost of the electrochemical cleaning salt bath furnace.

The invention provides a moving bed bio-membrane reactor based on blade self-driven rotary aeration. The moving bed bio-membrane reactor comprises a reactor body, a bearing support is arranged at the upper end of the reactor body, an air riser is arranged on the bearing support, an air inlet pipe is arranged at the upper end of the air riser, the lower end of the air riser is fixed on a plummer block II, and the plummer block II is arranged at the bottom of the reactor body. Rotary blades are further arranged on the air riser, a rotary air transverse pipe is arranged at the lower end of the air riser, and a through hole is formed in the rotary air transverse pipe. The reactor provided by the invention can promote uniform fluidization of a filler, prevent the phenomena of filler accumulation or ball death and the like, and also can prevent sludge sedimentation.

The invention discloses a preparation method of an ultrahigh-quality SOI-based bonded Ge film. The method comprises steps of carrying out surface treatment of a Ge substrate and an SOI substrate; sputtering a layer of a-Ge film on each of the two substrates; laminating the Ge substrate and the SOI substrate in the atmosphere, putting the bonded Ge substrate and the SOI substrate into an annealingfurnace for low-temperature thermal annealing to realize high-strength Ge/SOI bonding, and thinning and polishing the bonded Ge substrate by adopting chemical corrosion combined with chemical mechanical polishing to obtain the ultrahigh-quality SOI-based bonded Ge film.

The invention relates to an anti-deformation heat treatment basket. The anti-deformation heat treatment basket comprises multiple layers of detachably-connected frame bodies. Each frame body comprises multiple units which are arranged in a plane. Each unit comprises a framework, two ratchet wheel supporting pipes and a ratchet wheel supporting plate. Multiple pairs of threaded holes are formed in the framework of each unit. The two ratchet wheel supporting pipes of each unit are arranged in the corresponding framework in parallel. The end of the ratchet wheel supporting plate of each unit cooperates with one corresponding pair of threaded holes through bolts, the ratchet wheel supporting plate of each unit is fixed in the corresponding framework, and the ratchet wheel supporting plate of each unit and the corresponding ratchet wheel supporting pipes are perpendicularly arranged in different planes. The end of the ratchet wheel supporting plate of each unit cooperates with one corresponding pair of threaded holes through the corresponding bolts, so that the ratchet wheel supporting plate of each unit is fixed in the corresponding framework. Thus, the ratchet wheel supporting plates can move in the frameworks, due to the fact that unevenness of parts is different, flexible adjustment can be conducted according to the unevenness of the parts via the ratchet wheel supporting plates in the loading process, and it is guaranteed that the parts do not deform in the heat treatment process.

The invention discloses a chemical polishing solution for precision copper alloy workpieces. The chemical polishing solution is prepared from the following raw materials in parts by weight: 1000 to 1200 parts of 85 percent by weight phosphoric acid, 350 to 500 parts of 98 percent by weight sulfuric acid, 3 to 10 parts of aluminum phosphate, 10 to 30 parts of potassium peroxodisulfate, 0.1 to 0.5 part of diphenylthiourea and 3 to 5 parts of corrosion inhibitor, wherein the corrosion inhibitor is a mixture of 2-ethyl-3-5-dimethylpyrazine, thiourea, sorbitol and sulfosalicylic acid in a mass ratio of 1 to (1 to 3) to (3 to 5) to (5 to 10). Compared with the prior art, the copper alloy chemical polishing solution provided by invention is environmentally friendly, is free from yellow smoke, islow in corrosion rate, can achieve a bright mirror effect, and is particularly suitable for polishing copper alloy precision parts with strict size requirements.

The invention relates to a lead-calcium polar plate for a storage battery, and a collecting bar welding rod. The collecting bar welding rod is characterized by being prepared from the components in percentage by weight: 3.5-4.5 percent of antimony, 0.1-0.4 percent of tin, 0.02-0.08 percent of arsenic and the balance being lead. With the adoption of the collecting bar welding rod, the phenomena of faulty welding and false welding are not easy to occur, the welding quality is good, and the service life of the storage battery is relatively long.