8results about How to "Reduce galvanic corrosion" patented technology

The invention relates to the technical field of continuous coating of steel strips, and particularly discloses a CX-grade extreme environment corrosion-resistant pre-coating hot-dip coating steel strip with double functions of shielding isolation and cathode protection. The steel substrate is protected through the alloy plating layer, the primer coating and the finish coating together, and it is limited that polyaniline nanoparticles are contained in the primer coating and the finish coating. Within the limited use amount range, polyaniline is added, and the alloy coating, the primer coating and the finish coating are combined within the specific thickness range, so that the protection effect on the steel substrate can be improved jointly, and the influence of an external corrosive medium on the steel substrate is reduced; and the pre-coating hot-dip coating steel strip capable of serving for a long time in a CX-grade extreme corrosion environment is obtained.

The invention provides a W-type ferrite and cluster MoS2 wave-absorbing anti-corrosion material and a preparation method thereof, and belongs to the field of wave-absorbing anti-corrosion materials.The method comprises the steps that metal nitrate and water are mixed, citric acid monohydrate and ammonia water are added to adjust the pH value, oil bath is conducted to a gel state, heat treatment is conducted after drying, and W-type ferrite powder is obtained; the preparation method comprises the following steps: mixing W-type ferrite powder, hexadecyl trimethyl ammonium bromide and water, and stirring; adding ammonium molybdate tetrahydrate and thioacetamide, stirring, and pouring into a hydrothermal kettle for hydrothermal reaction; after the reaction is completed, centrifuging, washing and drying to obtain W-type ferrite coated with cluster MoS2; and mixing and co-curing the W-type ferrite coated with the cluster MoS2, epoxy resin and a curing agent to obtain the W-type ferrite and cluster MoS2 wave-absorbing anticorrosive material. The wave-absorbing performance of pure resin is improved, and meanwhile the anti-corrosion performance in the severe environment is enhanced.

The invention discloses a novel mixed insulator for a coastal operation environment and a preparation method thereof, and relates to the field of insulators. The preparation method comprises the following steps: manufacturing a mold, controlling the thickness of the surface silicone rubber to be 1-8mm, and enabling the insulator to be a porcelain or glass insulator; carrying out surface treatment on the insulator by adopting a plasma jet technology; placing the insulator in the mold, injecting the high-temperature vulcanized silicone rubber banburying material into the mold, and curing and demolding to obtain the high-temperature vulcanized silicone rubber. A layer of high-temperature silicone rubber with a breakdown-resistant effect is vulcanized on the surface of the porcelain / glass insulator, hydrophobicity is improved, surface creepage density is reduced, electrochemical corrosion is reduced, the anti-pollution flashover performance of the composite insulator is combined, meanwhile, the excellent mechanical performance of the porcelain / glass insulator is reserved, and the operation requirements of insulators in coastal areas can be met.

The application relates to a preparation method of an entropy-based oxide catalyst with high metallic property and application of the entropy-based oxide catalyst in hydrogen production by acidic electrolytic water, and belongs to the field of catalysis. A water-soluble salt containing at least Ru, Ir and A is uniformly mixed, hydrolyzed and reduced under water bath stirring condition by taking zinc oxide as a carrier and a sodium borohydride solution as a reducing agent, then the black powder of the medium-entropy alloy is formed through filtration, washing and drying, and finally the black powder is subjected to rapid incomplete oxidation under the condition of 300-500 DEG C and air atmosphere, and then is subjected to acid pickling, filtration, washing and drying to prepare the entropy-based oxide catalyst with high metallic property. The catalyst contains a large amount of Ir-Ir metal bonds and / or Ir-Ru metal bonds, and the proportion can reach 30%-40%. The mismatch between the metal atom fingerprint structure and the metal-oxygen atom coordination structure causes serious lattice distortion, induces unbalanced distribution of stress and strain, and promotes the kinetics of the acidic oxygen evolution reaction.

The invention relates to the technical field of electrochemistry, and discloses a preparation method of a graphite composite material and application of the graphite composite material. Aluminum and lead metals are added into the graphite fluoride to increase the conductivity, and meanwhile, the chemical resistance and high temperature resistance of the graphite fluoride can supplement the characteristics of aluminum and lead, so that a better lubricating effect is achieved; the mixed resin of phenolic resin, epoxy resin and polyester resin with different proportions is used as a modifier to modify carbon monofluoride, and graphite with poor mechanical strength is coated by the mixed resin of phenolic resin, epoxy resin and polyester resin, so that the mechanical strength and thermal stability of the polar plate can be enhanced, and the service life of the polar plate is prolonged. The electrocorrosion in the electrochemical reaction process is effectively reduced, so that the use performance of the polar plate material is lasting; the graphite composite material electrode prepared by the preparation method has excellent electrochemical performance; and meanwhile, the polar plate also has excellent mechanical property and corrosion resistance, so that the polar plate has longer service life.

This utility model provides a double-wing stationary contact assembly for a switch machine, relating to the field of switch machine technology. The double-wing stationary contact assembly includes: a base with at least two slots; and a contact assembly disposed at the slots. The contact assembly includes a contact piece and a contact post connected together. The contact piece includes a first contact piece and a second contact piece, with the second contact piece disposed outside the first contact piece. The first contact piece includes an arc segment and a first connecting segment. The second contact piece includes a bent segment and a second connecting segment, with the arc segment disposed within the bent segment. The first connecting segment and the second connecting segment are stacked. This stationary contact assembly solves the problems of low reliability, easy arc erosion, and poor self-cleaning ability of existing stationary contact assemblies due to single-wing contact.

The invention discloses a preparation method of a high-metallicity entropy-based oxide catalyst and application of the high-metallicity entropy-based oxide catalyst in hydrogen production by acidic electrolyzed water, and belongs to the field of catalysis. Zinc oxide serves as a carrier, a sodium borohydride solution serves as a reducing agent, water-soluble salt at least containing Ru, Ir and A is evenly mixed under the water bath stirring condition, hydrolysis and reduction are conducted, then medium-entropy alloy black powder is formed through suction filtration, washing and drying, finally, rapid incomplete oxidation is conducted in the air atmosphere of 300-500 DEG C, then acid pickling, suction filtration, washing and drying are conducted, and the medium-entropy alloy black powder is obtained. And the entropy-based oxide catalyst with high metallicity is prepared. The catalyst contains a large number of Ir-Ir metallic bonds or / and Ir-Ru metallic bonds, and the proportion of the Ir-Ir metallic bonds or / and the Ir-Ru metallic bonds can reach 30%-40%. Serious lattice distortion is caused by mismatching of a metal atom fingerprint structure and a metal-oxygen atom coordination structure, stress-strain imbalance distribution is induced, and acidic oxygen evolution reaction kinetics is promoted.

According to the display substrate and the display device, the back metal layer is arranged in the isolation area and located between the isolation column and the substrate, after the back metal layer is connected with the positive electrode power source, the back metal layer can be positively charged, the isolation area is arranged around the opening area, so that the isolation area forms a positive electric field, and the display effect is improved. Under the action of a positive electric field, the isolation columns are positively charged, so that K < + > ions in POL can be repelled when a reliability test is carried out on a product, and electrochemical corrosion can be effectively reduced and hole black spots can be avoided in a power-on process of the display substrate.