46results about How to "Reduce hydrogen embrittlement" patented technology

The invention discloses an electroplated diamond wire saw sand-applying device. The device sequentially comprises the components, from top to bottom: a vertical tubular sand-applying sub tank, a liquid-returning box, and a plating solution master tank. A guide wheel is fixed in the liquid-returning box. A core wire is sequentially wound on a wire-feeding conductive wheel on the bottom of the vertical tubular sand-applying sub tank and the guide wheel. The core wire then penetrates the vertical tubular sand-applying sub tank, and is finally wound on a wire-discharging conductive wheel on the top of the vertical tubular sand-applying sub tank. The wire-feeding conductive wheel and the wire-discharging conductive wheel are connected in parallel, and are then connected to the negative electrode of an electroplating power supply. Metal anodes are arranged around the core wire in the vertical tubular sand-applying sub tank. The metal anodes are connected with positive electrodes of the electroplating power supply. Through a water pump above the plating solution, the plating solution is lifted from the plating solution master tank into the vertical tubular sand-applying sub tank. With the device provided by the invention, sand-application of produced diamond wire is uniform and good. During the production process, current density is high, efficiency is high, internal stresses of the plating and the substrate are small, plating solution application amount is low, and wire breakage probability is low.

The invention discloses a wear-resistant workpiece and a manufacturing method of a wear-resistant coating thereof. The preparation method of the wear-resistant coating comprises the following steps: forming a preparation piece according to the structure of a required wear-resistant workpiece; coating nickel on the surface of the preparation piece through a double-pulse method, thus forming a nickel-coated transition piece; and coating a hard chromium layer on the surface of the nickel-coated transition piece, thus forming the wear-resistant coating on the surface of the preparation piece. For the manufacturing method of the wear-resistant workpiece, a step of coating nickel on the surface of the workpiece through a double-pulse nickel coating method is added; and the double-pulse nickel coating method is characterized in that the magnitude of current or voltage is regulated by an external control means, the current is additionally controlled by controlling the pulse switch-on time, the pulse switch-off time, the pulse duty factor, the pulse current density and the like, and corresponding variables are changed to respectively achieve the effects of increasing the cathode current density, inhibiting the generation of side reaction, reducing the impurity content in the coating, improving the current distribution and the like, thus improving the quality of the coated nickel layer and prolonging the service life of the wear-resistant workpiece.

The invention relates to copper plating solution for copper coating, which comprises the following compositions: 0.03 to 0.5 mol/l of copper sulphate, 0.10 to 0.3 mol/l of sulphate and 0.1 to 0.7 mol/l of a complexing agent, and the PH value is regulated to 6.5 to 8.0. In the invention, surface copper coating is carried out on a permanent-magnet material which is pre-treated by the copper plating solution so as to obtain a copper coating with evenness, stability and strong bonding force of the copper coating, and the surface of the permanent-magnet material has excellent corrosion resistance.

The invention discloses a method for preparing a high-silicon steel ribbon through using an electric brush composite plating method. The method is characterized in that a pure iron ribbon, a low-carbon steel ribbon or a low-silicon steel ribbon is used as a cathode plating piece ribbon, an electric brush plating anode plate is used as an anode, a layer of iron-silicon iron particle composite plating layer is coated on the cathode plating piece ribbon through using an electric brush composite silicon plating process, a composite plating layer steel ribbon adopting a steel-ribbon substrate as a core part is formed, then the uniform dispersion heat treatment is carried out, silicon-contained particles in the iron-silicon iron particle composite plating layer are uniformly dispersed into the steel ribbon substrate of the core part, and the high-silicon steel ribbon can be continuously prepared. The invention also discloses a continuous silicon steel ribbon preparing device which comprises an unreeling guide device, a conveying device, an electroplating device, a dispersion heat treatment device and a rolling device. The high-silicon plating layer is electrically plated on the cathode plating piece ribbon, then the high-silicon steel ribbon with an excellent magnetic conduction performance is obtained through using a heat treatment process, the simplicity in operation can be realized, characteristics such as high efficiency and continuity in preparation can be achieved, and the preparation cost also can be greatly reduced.

The invention relates to a method for removing hydrogen in high strength steel electroplated by zinc-nickel alloy, including the following steps: 1) zinc nickel alloy coated high strength steel parts are sequentially cleaned by water and soaked by alcohol; 2) parts after being cleaned are placed into a vacuum furnace to be subject to heat treatment, so that hydrogen atom on coating surface is overflown; 3) parts after hydrogen removal are placed into citric acid-boric acid mixed aqueous solution to be activated; 4) parts after coating activation treatment are subject to zinc nickel alloy electroplating again; 5) parts after composite electroplating are placed into chromic anhydride-sodium chloride mixed aqueous solution to be passivated; 6) parts after passivation treatment are cleaned by water and dried by blowing, thus obtaining the finished product conforming to the requirements. The method can be utilized to effectively remove hydrogen penetrated into base metal in electroplated by zinc-nickel alloy process, hydrogen embrittlement is reduced, and passivation coating with good protective properties can be generated on the surface of alloy coating, and meanwhile the technological method of the invention is simple and production cost is low.

The invention discloses a high-corrosion-resistance nickel-copper alloy seamless pipe. Chemical components of the high-corrosion-resistance nickel-copper alloy seamless pipe comprise, by weight, 60% of Ni or more, 35%-37% of Cu, 2% of Fe or less, 1% of Mn or less, C smaller than 0.4%, Si smaller than 0.3%, S smaller than 0.015%, Pb smaller than 0.01%, Bi smaller than 0.15%, Sn smaller than 0.22%, Sb smaller than 0.13% and the balance inevitable micro elements. A manufacturing method of the high-corrosion-resistance nickel-copper alloy seamless pipe comprises the following steps of smelting, casting of a round pipe blank, heating of the round pipe blank, perforating, the first time of acid pickling, cold rolling, degreasing, heat treatment, finishing and the second time of acid pickling. The manufactured high-corrosion-resistance nickel-copper alloy seamless pipe is smooth in surface, free of cracks, good in surface quality, high in size precision and excellent in corrosion resistance. The manufacturing method is short in procedure, easy and convenient to operate, high in efficiency and yield and low in cost, pickling waste water concentration and treatment cost.

The invention discloses a heat treatment process of high-wear-resistance antirust gear steel. The heat treatment process comprises the following steps of carrying out hot die forging on a gear blank by using a medium alloy steel raw material; carrying out heating pretreatment on the gear blank; carrying out sub-temperature secondary normalizing; refining a tissue structure; periodically supplyingoxygen into a normalizing furnace at a constant speed during secondary normalizing heating of the gear blank; and carrying out sufficient pyrolysis combustion dehydrogenation. According to the heat treatment process, crystalline grains of the gear blank are refined through sub-temperature secondary normalizing, so that the cracking tendency of a steel part is reduced; the oxygen is supplied for sufficient pyrolysis combustion dehydrogenation, so that the hydrogen embrittlement phenomenon is reduced; the structure is uniformly strengthened through quenching and tempering treatment, so that theinternal structure is uniform and compact, the heat conduction and dissipation performance is improved, and steel structure layering is avoided; dirt on the surface of steel is removed through shot blasting treatment, so that the bonding strength between a workpiece and a protective coating is improved, the wear-resisting and rust-preventing effects are achieved through cooperation with a hot galvanizing layer, and the surface organization structure of the rough gear is strengthened; and overall carburizing and outer side quenching layer carbonitriding are combined, so that the overall performance of the gear steel is improved.

The invention discloses a method for treating the surface of a high-strength fastener, relates to the field of methods for treating the surfaces of fasteners in the field of fasteners, and aims to solve the problem that a fastener is cracked or damaged due to the fact that hydrogen embrittlement is easily generated in the treatment process of an existing treatment method. The method comprises thefollowing steps: step 1. degreasing; step 2. removing oxide skin by laser; step 3. performing electroplating treatment; step 4. performing hydrogen embrittlement reduction processing; step 5. performing chromate passivation treatment; step 6. performing drying treatment; step 7. coating grease; and step 8. taking out and draining.

The invention discloses a preparation method of a NiMoP electrode for hydrogen evolution by alkaline electrolysis of water, which comprises the following steps: (1) placing foamed nickel in a strong acid solution for electrochemical corrosion, then taking out the foamed nickel, and cleaning the foamed nickel with ethanol and deionized water in sequence to obtain the foamed nickel after electrochemical corrosion; (2) selecting a nickel salt, a molybdenum salt and a phosphor salt to prepare a NiMoP mixed solution, then adding a buffer agent, and then adjusting the pH value of the solution to 9-10 by using an inorganic base to obtain an electroplating solution; (3) transferring the electroplating solution prepared in the step (2) into an electroplating bath, and carrying out electro-deposition in a hydrogen-rich atmosphere by taking foamed nickel as an anode and taking the foamed nickel subjected to electrochemical corrosion as a cathode; and (4) after the electro-deposition reaction is finished, cleaning the electrode with deionized water, and performing vacuum drying at room temperature to obtain the NiMoP/NF hydrogen evolution electrode. The finally prepared NiMoP/NF hydrogen evolution electrode has excellent HER performance, and has long-time stability in a three-electrode system and a simulated industrial electrolytic cell.

The invention discloses a nano zinc-cobalt alloy coating based on double-pulse electrodeposition and a preparation method of the nano zinc-cobalt alloy coating. According to the preparation method ofthe nano zinc-cobalt alloy coating based on double-pulse electrodeposition, a zinc plate is used as an anode, a low-carbon steel sheet is used as a cathode, and a nano zinc-cobalt alloy coating is electroplated in a plating solution through a double-pulse electrodeposition process, wherein the pH value of the plating solution is 4-5. the concentration of zinc ions is 0.64 mol/L-0.70 mol/L, the concentration of cobalt ions is 0.1 mol/L-0.16 mol/L, the electrodeposition time is 20 min, the forward current density is 1.5 A/dm<2>-3.0 A/dm<2>, the forward duty ratio is 30%-70%, the forward period is 30 ms-70 ms, the reverse current density is 0.2 A/dm<2>-0.4 A/dm<2>, the reverse duty ratio is 30%-70%, the forward working time is 100 ms, the reverse working time is 12 ms, and the reverse periodis 1 ms. The surface of the nano zinc-cobalt alloy coating prepared with the preparation method of the nano zinc-cobalt alloy coating based on double-pulse electrodeposition is bright and smooth, crystals are uniform and dense, the binding force of the nano zinc-cobalt alloy coating and a base material is good, and excellent anti-corrosion performance is achieved.

The invention discloses a Ni-P-PFA-SiO2 nano composite coating and a preparation method thereof, which belong to the technical field of metal surface engineering. According to the Ni-P-PFA-SiO2 nano composite coating, a Ni-P coating serves as a bottom layer, then the Ni-P-SiO2 coating, the Ni-P-PTE-SiO2 coating and the Ni-P-PFA-SiO2 coating are sequentially plated, surface dirt is removed by conducting alkali washing, electric alkali washing and acid washing on a base material in the preparation process, the binding force of the coatings is improved by adopting a method of conducting layered plating for four times, the porosity of the coatings is effectively reduced, the microstructure of the plating layer is changed, so that the hardness performance of the plating layer is more excellent, the preparation method is environment-friendly, the plating solution can be reused, and the method is scientific, reasonable, high in applicability and good in anti-corrosion effect. By adopting the method, the service life of the steel article can be prolonged, and the cost is saved.

The invention discloses a novel process for electroforming jewelry by using platinum, and relates to the technical field of jewelry machining. The process comprises the following steps that a bottom die is machined; platinum electroforming is conducted, specifically, tetraammine platinum sulfate is used as main salt, potassium sodium tartrate tetrahydrate is used as conducting salt, an electroforming solution is formed, the surface of the bottom die is electroplated with a platinum plating layer of 100 microns-500 microns in the electroforming solution, and a rough workpiece is formed; and platinum hollow die forming is conducted, specifically, the bottom die of a rough workpiece is removed, the rough workpiece is ground and polished, and the jewelry is formed. According to the process, the platinum plating layer with the thickness of 100 microns-500 microns can be electroformed through cooperation of all the steps, the probability of the hydrogen embrittlement phenomenon of the electroformed platinum plating layer is low, and the problem that the platinum plating layer is prone to brittle cracking due to the hydrogen embrittlement phenomenon when the platinum plating layer with the thickness of 100 microns or above is electroplated is solved.

The invention discloses a manufacturing method of a stamping part. The manufacturing method comprises the following steps that a blank is stamped to form a preformed part; the preformed part is placed in an acid electroplating solution to be electroplated for the first time; and placing the preformed part subjected to the first electroplating in an alkaline electroplating solution for second electroplating. According to the scheme, it can be guaranteed that the preformed part has high corrosion resistance and good cold bending performance, meanwhile, the thickness of a plating layer on the surface of the preformed part can be uniform through the method, and the welding performance of the preformed part in the later procedure is not affected.

The invention discloses a preparation method of a porous alloy electrode, which is characterized in that a Ni-Cu-La-P porous alloy electrode is prepared by adopting a dealloying method, loading nano gamma-Fe2O3 on the porous alloy electrode by adopting a dispensing method, and then loading a photocatalyst on the surface of the electrode by adopting an electro-deposition method; the prepared porous alloy electrode is applied to treatment of organic wastewater containing micro-plastics and reduction of hydrogen evolution overpotential under the illumination condition, the hydrogen evolution overpotential of a water electrolysis cathode can be obviously reduced, the micro-plastics and organic pollutants in water can be removed, the removal rate is 90% or above, the preparation process is simple and easy to operate, the electrode is convenient to use, and the method is suitable for industrial production and market popularization and application.