91results about How to "Reduce hydrogen evolution" patented technology

An implant made in total or in parts of a biodegradable magnesium alloy consisting of Y: 2.0-6.0% by weight, Nd: 1.5-4.5% by weight, Gd: 0-4.0% by weight, Dy: 0-4.0% by weight. Er: 0-4.0% by weight, Zr: 0.1-1.0% by weight, Li:0-0.2% by weight, Al: 0-0.3% by weight, under the condition that a) a total content of Er, Gd and Dy is in the range of 0.5-4.0% by weight and b) a total content of Nd, Er, Gd and Dy is in the range of 2.0-5.5% by weight, the balance being magnesium and incidental impurities up to a total of 0.3% by weight.

The invention discloses a graphene-bismuth oxide composite material. The graphene-bismuth oxide composite material comprises graphene as well as bismuth oxide loaded on a graphene sheet layer, wherein the mass ratio of bismuth oxide to graphene is (0.005-0.25):1. The invention also discloses a preparation method of the composite material as well as lead carbon battery cathode diachylon comprising the composite material as well as a preparation method of the lead carbon battery cathode diachylon and a lead carbon battery cathode plate. According to the invention, the generation of hydrogen on the surface of graphene is inhibited by loading bismuth oxide on the sheet layer of graphene, so that the hydrogen evolution phenomenon of the lead carbon battery cathode plate is inhibited; the reduction of lead carbon battery current efficiency and the battery water loss phenomenon are prevented effectively; the service life of the lead carbon battery is ensured.

A filling grease for composite fibre-optical overhead earth wire is prepared by mixing 36®|hydrogenated white oil and PAO-8 synthesized oil with PriCO-3002 polybasic alcohol ester and viscosity exponential improver Lc-212, adding into additive OB fluorescent brightening agent, grease-separating inhibitor BP2400 and G1702, raising temperature, stirring, adding into organic thickening agent gas-phase carbon white H20, raising temperature, thickening, adding into antioxidant AT-215 and inorganic thickening agent SEP1650, raising temperature, thickening, shearing, circulation feeding back, cooling to normal temperature, homogenizing, degassing, filtering and obtaining the grease. It achieves good hydrogen absorption and stable fibre-optical transmitting performance.

The present invention discloses a preparation method for electrodeposition of a hydroxyapatite coating on the surface of titanium or a titanium alloy. The method comprises: adopting a pretreated titanium substrate or a pretreated titanium alloy substrate as a cathode, adopting a platinum-plated titanium mesh as an anode, heating an electroplating solution to a constant temperature of 40-80 DEG C, and adopting a constant current manner or a constant potential manner under a magnetic stirring condition to carry out electrodeposition, wherein a current density is 1.0-50.0 mA.cm<-2>, a deposition potential is 1.0-10.0 V, the electroplating solution comprises 20.2-80.0 mmol.L<-1> of Ca<2+> and 10.0-50.0 mmol.L<-1> of H2PO4<->, a Ca/P molar ratio is 1.6-2.0, a supporting electrolyte concentration is 0.1-1.0 mol.L<-1>, and the pH value is 4.2-5.0. According to the present invention, the hydroxyapatite coating prepared through electrodeposition by using the constant current manner or the constant potential manner has characteristics of fine crystal, smooth surface, strong bonding force with the substrate, good biological activity and mechanical property. The preparation method for the titanium base hydroxyapatite composite material has characteristics of mild reaction condition, avoidance of influence on material biological activity by a high temperature treatment, simple process, and low equipment investment, wherein a series of problems caused by expensive equipment and complex operation of the existing method are overcome with the preparation method.

The invention discloses a method for eliminating impurity influence of an all-vanadium redox flow battery electrolyte. The method comprises the steps of adding a complexing agent into the electrolyte, and fully stirring the electrolyte, wherein the complexing agent is phosphoric acid, inorganic phosphate, hydramine, amino carboxylate, hydroxy carboxylate or organic phosphate. By the method, the steps of impurity elimination during the preparation process of the electrolyte is omitted or reduced, the operation process is simple, the product is rich in raw material, complicated impurity elimination equipment is not needed to be matched, the impurity elimination cost is low, and the method is suitable for application on a large scale; by a mode of adding the complexing agent, impurity metal ions form a complexity body, a reaction electrical pair shifts out of a reaction potential section of an active substance of the all-vanadium redox flow battery electrolyte, the hydrogen evolution promotion effect of the metal ions is eliminated, the hydrogen evolution quantity of the redox flow battery is reduced, the capacity attenuation is reduced, and the lifetime of the redox flow battery is prolonged; and impurity ions introduced during the construction, running and maintenance process of the redox flow battery can be rapidly eliminated, and the method is simple and convenient and is suitable for promotion and application.

The invention provides a process for electrolyzing and refining lead, zinc and copper through a wet method. The process includes the specific steps that an alkalescent complexing solution with high complexing capacity is selected as a leaching solution and all valuable metals are leached out; impurities of the leaching solution are removed through a metal replacement mode; deposited lead or deposited zinc or deposited copper and oxygen are obtained through an electrolytic method; then the solution is subjected to desulfuration and desilicication through calcium oxide or calcium hydroxide; and finally, the lead or the zinc or the copper is obtained after being refined. The alkalescent complexing solution is adopted for leaching and electrolyzing, so that the problems that the leaching rate is low and metal silicates and ferrates are hard to dissolve in terms of current metal smelting with the wet method are solved. Compounds of calcium or barium are adopted for desulfuration of metal sulfates, so that the problem of high desulfuration cost caused by current desulfuration through sodium carbonate or sodium hydroxide is solved. The potential of hydrogen (pH) value of the alkalescent complexing solution is controlled to be 7.5-13.5, the electrolytic voltage is substantially lowered, and the energy consumption is effectively reduced.

The invention relates to the field of alkaline zinc-manganese dioxide cells, and specifically relates to an alkaline zinc-manganese dioxide cell. The alkaline zinc-manganese dioxide cell comprises a positive electrode cap (1), a positive electrode ring (2), a steel shell (3), a current collector copper nail (4), a negative electrode zinc gel (5), diaphragm paper (6), a sealing ring (7), a supportring (8) and a negative electrode bottom (9); the positive electrode ring (2) is composed of electrolytic manganese dioxide, conductive agent graphite and electrolyte; and the negative electrode zincgel (5) comprises zinc powder, a binding agent, an expanding agent, an electrolyte potassium hydroxide solution and polyethylene glycol 2000. According to the alkaline zinc-manganese dioxide cell provided by the invention, the discharge performance of the alkaline zinc-manganese dioxide cell is not influenced or even slightly improved, and the problem of expansion of the zinc gel is effectively solved; and meanwhile, the hydrogen content of the cell is remarkably reduced, and the liquid leakage risk of the cell is greatly reduced, therefore, the discharge performance of the cell is effectivelyimproved, the storage life of the cell is prolonged, and the safety performance of the cell is remarkably improved.

An implant made in total or in parts of a biodegradable magnesium alloy consisting of Y: 2.0-6.0% by weight, Nd: 1.5-4.5% by weight, Gd: 0-4.0% by weight, Dy: 0-4.0% by weight, Er: 0-4.0% by weight, Zr: 0.1-1.0% by weight, Li:0-0.2% by weight, Al: 0-0.3% by weight, under the condition that a) a total content of Er, Gd and Dy is in the range of 0.5-4.0% by weight and b) a total content of Nd, Er, Gd and Dy is in the range of 2.0-5.5% by weight, the balance being magnesium and incidental impurities up to a total of 0.3% by weight.

The present invention relates to implants made of a biodegradable magnesium alloy. The inventive implant is made in total or in parts of a biodegradable magnesium alloy comprising:

• • Y: 0-10.0% by weight
  • Nd: 0-4.5% by weight
  • Gd: 0-9.0% by weight
  • Dy: 0-8.0% by weight
  • Ho: 0-19.0% by weight
  • Er: 0-23.0% by weight
  • Lu: 0-25.0% by weight
  • Tm: 0-21.0% by weight
  • Tb: 0-21.0% by weight
  • Zr: 0.1-1.5% by weight
  • Ca: 0-2.0% by weight
  • Zn: 0-1.5% by weight
  • In: 0-12.0% by weight
  • Sc: 0-15.0% by weight
  • incidental impurities up to a total of 0.3% by weight
  • the balance being magnesium and under the condition that
  • a) a total content of Ho, Er, Lu, Tb and Tm is more than 5.5% by weight;
  • b) a total content of Y, Nd and Gd is more than 2% by weight; and
  • c) a total content of all alloy compounds except magnesium is more than 8.5% by weight.

The present invention relates generally to a bio-degradable implant based on magnesium having a reduced corrosion rate and to a method for the production of such an implant. It is a a method for treating a surface of a bio-degradable metallic implant comprising the following steps: providing a dispersed system comprising a colloid-dispersed apatite and adding an apatite powder to the dispersed system, subjecting an implant to the dispersed system such that a surface of the implant which is to be treated is immersed in the dispersed system wherein the implant comprises a magnesium based alloy, applying an AC voltage difference between the implant as a first electrode and a second electrode positioned in the dispersed system for generating a plasma electrolytic oxidation on the immersed surface of the implant so that the immersed surface is converted to an oxide film which is at least partially covered by apatites formed by the colloid-dispersed apatite and the apatite powder. The evolution of corrosion induced hydrogen gas evolution is decreased and osseointegration is improved.

The invention relates to an aluminum electrolytic capacitor electrolyte and a preparation method thereof, wherein the electrolyte is prepared from the following raw materials in percentage by weight: 70% of glycol, 1.5% of ammonium dihydrogen phosphate, 8% of ammonium pentaborate, 14% of ammonium adipate, 4.5% of breakdown voltage enhancing agent, 1% of phosphorous acid and 1% of deionized water. The preparation method comprises the following steps: taking and adding 70kg of glycol and 1kg of deionized water into a container, uniformly stirring, and heating to 110 DEG C; weighing 4.5kg of breakdown voltage increasing agent, 1.5kg of ammonium dihydrogen phosphate, 1kg of phosphorous acid, 8kg of ammonium pentaborate and 14kg of ammonium adipate by using a scale, and then, sequentially adding the materials into the container and stirring; and keeping the mixture at the constant temperature of 110 DEG C for 30 minutes, naturally cooling the mixture to the room temperature, and then discharging. The invention has the advantages of enhancing the breakdown voltage of the electrolyte, improving the capacity of repairing aluminum foil oxidation films by oxygen ions of the electrolyte, reducing generation of water and precipitation of hydrogen gas in the working process, and obviously improving the service performance of the aluminum electrolytic capacitor.

The invention relates to graphene lithium ion battery electrolyte, which comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive is prepared from the following components: 5%-6.5% of hexamethyl disilazane, 0.5%-3.5% of octamethylcyclotetrasiloxane, 4.5%-8.5% of graphene and 0.3%-5.3% of vitamin E on the basis of total weight of the electrolyte. The graphene is added to the lithium ion battery electrolyte, so that the voltage resistance of the electrolyte can be greatly improved; the electrolyte is not easy to decompose at high pressure; corrosive substances in an electrolyte system and the corrosive substances dissociating on the surface of a positive electrode can be effectively removed by the octamethylcyclotetrasiloxane; a lead electrode surface is adsorbed in the charging and discharging process due to the addition of the hexamethyl disilazane; equivalently, the deposition potential of hydrogen is improved; precipitation of hydrogen can be reduced; the lithium ion battery is stored in a high-temperature state; the capacity retention ratio and the capacity recovery rate are high; and the cycle performance is excellent.

The invention specifically relates to a silicon steel pickling promoter and a preparation method thereof. According to a technical scheme in the invention, the silicon steel pickling promoter is prepared from 0.1 to 5.0 wt% of a corrosion inhibitor, 10.0 to 50.0 wt% of an inorganic salt reducing agent, 0.1 to 5.0 wt% of an emulsifier, 5.0 to 20.0 wt% of an organic metal ion chelating agent, 0.1 to 5.0 wt% of a defoaming agent, 0.1 to 5.0 wt% of a synergist and 20.0 to 80.0 wt% of water through uniform mixing at normal temperature with stirring. The silicon steel pickling promoter provided by the invention has the characteristics of convenience in usage, high pickling efficiency, low cost, environment friendliness, a good corrosion inhibition effect, etc.

The invention discloses a preparation method of an electrolyte of an iron-chromium flow battery and the obtained electrolyte. The electrolyte is prepared by adding one or more additives into a basic electrolyte of ferric chloride, ferrous chloride, chromium chloride and hydrochloric acid. The invention particularly introduces an additive of the electrolyte, wherein the additive comprises one or more of ammonium chloride, propylene diamine tetraacetic acid, indium chloride, carbon quantum dots and Mxene quantum dots; and the concentration of the additive in the electrolyte is 0.1-30 mol/L. Compared with the prior art, the additive introduced in the invention can be directly added in the process of preparing the electrolyte without introducing a subsequent additional adding process, so that the preparation process is simple, the property of the electrolyte cannot be changed, and the electrolyte is non-toxic, harmless, low in price, safe and environment-friendly. The activity of positive and negative electrode redox reaction can be effectively improved, the battery performance is improved, and the side reaction of cathode hydrogen evolution is inhibited.

The invention discloses a preparation method of a ZnO/sisal fiber-based carbon composite material and an application thereof. The preparation method comprises the steps of first, pretreating a sisal fiber, mainly treating surface impurities and low polymer molecules of the sisal fiber through an acid-alkali two-step treatment method; and then preparing the ZnO/sisal fiber-based carbon composite material by taking the pretreated sisal fiber and zinc hydroxide as raw materials and adopting an in-situ carbon-thermal synthesis method. The prepared ZnO/sisal fiber-based carbon composite material isapplied to preparation of a negative electrode material; and the abovementioned material has good hydrogen evolution inhibition and electrochemical performance through detection and analysis of an electrochemical workstation.