116results about How to "Avoid hydrogen embrittlement" patented technology

The invention relates to a preparation method of a super-pressure hydrogen cylinder, which comprises choosing seamless steel pipe which is hot-roll-formed by high grade chrome-molybdenum steel whose wall thickness is not less 27mm, S is smaller 0.01.%, and P is smaller 0.020% as base material, no existing the weakness of wall thickness 5%line size through supersonic inspection, processing the form of the two end by rotationally pressing reducing, flattening the heads of the two ends, removing inner and outer folds on the shoulder portion, shot-blasting the inner side and the outer side of the bottle, heat hardening with heating temperature of 850-950 DEG C, tempering in 580-700 DEG C, accurately processing the end face of the bottle and inner threads and outer threads, shot-blasting the inner side and the outer side of the bottle in second time to remove remanent stress concentration area, proceeding 100% magnetic particle detection for the bottle, proceeding 100% ultrasonic detection to the two ends, carrying out secondary 100% supersonic inspection to the bottle after proceeded water pressure experiment and pressure-tight experiment according to mating installation specification, drying the inner portion of the bottle, processing rust prevention on the outer portion of the bottle, assembling bottleneck switches on bottlenecks on the two ends, and evacuating the inner portion to replace nitrogen atmosphere for storage for use.

The invention relates the chemical engineering field, especially a H2 and CO2 inhibiter. H2 and CO2 are produced accompany to oil-gas field exploitation and transfusion process, and can corrode exploitation equipment. The inhibiter contains at least (by wt. %): isopropyl alcohol 10-30, fatty alcohol polyoxyethylene ether .1-0.5, and litol polyoxyethylene ether 0.1- 1.0. The inhibiter can be used in oil/water well with high temperature and pressure, and has the advantages of good corrosion resistance, low consumption, low cost and high efficiency.

The invention relates to a copper alloy material used for lead frame and the preparation method, belonging to the copper alloy material field; wherein nickel accounts for 0.9 to 3.5% (weight percentage), silicon accounts for 0.18 to 0.8%, phosphorus accounts for 0.02 to 0.1% and the rest is copper. The preparation method is that all the components according to the weight ratio are mixed and melted, after casting, hot forging, solid solution, multiple cold rolling, deformation and aging, the product is got. The copper alloy material used for lead frame has the advantages of tensile strength of 600 to 850MPa, conductivity of 45 to 65%IACS, elongation of 5 to 8% and softening temperature of 500 to 550 centigrade; thereby the requirements on the copper alloy material performance of the lead frame in electronic industrial field is well achieved; the copper alloy material can also be used in the copper alloy material field needing high strength and high conductive, such as contact lines in trolleys and electric locomotives, rotor bars of the high-speed turbine generator and inner liners of the large thrust rocket engines.

The invention relates to corrosion inhibitor for hydrogenation device with constituent as: 10-30% fat nitrogen-containing compound, 10-20% aromatic sulfur-containing compound, 0-25% organic acid esters, 15-70% aromatics, and 0-25% imidazoline derivative. A little this product can effective inhibiting corrosion and salt dirty without any negative effect to product property and successive process fit to high-concentration H2S-HCl-H2O acidic or H2S-HCl-NH3-H2O basic system. It can form dense monomolecular layer protection membrane on metal surface to prevent hydrogen embrittlement phenomenon and fit to heat exchanger, air cooler and others.

The functional environment friendly metal deoiling, derusting and antirusting fluid is prepared with polyoxyethylene alkyl ether, sodium dodecyl sulfate, 1.3-dibutyl thiourea, hexamethylidyene tetraamine, zinc dihydrogene phosphate, phosphoric acid, sodium butylnaphthalene sulfonate, sodium sulfosuccinate, triethanolamine, sodium bicarbonate, tartaric acid and 1.3-diethyl sulfourea in certain weight proportion, and through dissolving, diluting with water, mixing to react, and filtering. It has the synergistic effect of the components to deoil, derust, phosphorize, deactivate and antirust metal surface, no harm to human body and no environmental pollution.

The invention discloses a metal part electroplating method. The metal part electroplating method includes the steps that a, film pasting is conducted, i.e., the surface of a metal part to be electroplated is covered with an anti-electroplating film coinciding with the portion, not needing electroplating, of the metal part; b, electroplating is conducted, i.e., the metal part with the surface covered with the anti-electroplating film is subjected to electrocoppering, electronickelling and electrogalvanizing, wherein an electrogalvanizing solution for electrogalvanizing is composed of 100-150 mg/L of sodium hydroxide, 5-10 mg/L of ethylenediamine, 25-30 mg/L of triethanolamine, 50-130 mg/L of alkaline tetra-iso-propyl amine, 10-15 mg/L of zinc sulfate, 40-59 mg/L of sodium citrate, 25-39 mg/L of phosphorous acid, 40-55 mg/L of dioctyl sodium sulfosuccinate and 25-67 mg/L of antimony potassium tartrate, and meanwhile electroplating parameters are set; and c, film removal is conducted, i.e., the anti-electroplating film on the metal part is removed after electroplating is completed. By means of the metal part electroplating method, the electroplating cost is reduced and the occurrence rate of hydrogen brittleness is also reduced.

The invention discloses a high-density tungsten alloy and a preparation method thereof, belonging to the field of metal materials. The tungsten alloy comprises the following components in percentage by mass: 95.0-99.0 percent of tungsten, 1.0-5.0 percent of zirconium oxide and inevitable impurities. The preparation method comprises the following steps: (1) respectively dissolving ammonium metatungstate and zirconium nitrate in water for mixing; drying the mixed liquid, and thus obtaining powder; calcining and reducing the powder, and thus obtaining composite tungsten powder; (2) after ball milling, carrying out compression molding and sintering for the composite tungsten powder, and thus obtaining a sintering billet; after dehydrogenation, carrying out deformation and thermal treatment for the sintering billet, and thus obtaining the high-density tungsten alloy. According to the preparation method, a ZrO2 strengthening phase is added in a tungsten matrix through a liquid-liquid doping method, and two segments of sintering processes, dehydrogenation and rotary swaging treatment are adopted to prepare the tungsten alloy. The preparation method solves the problems of uneven distribution of the strengthening phase of the traditional tungsten alloy, hydrogen embrittlement and low sintered density and provides a new direction for the application and development of the tungsten alloy in the new field.

The invention relates to a production process for effectively preventing marine anchor chain round steel from generating cracks. A preparation method includes the steps of an electric furnace smelting procedure, a refining procedure outside an LF, a square billet continuous casting procedure and a rolling procedure. Chemical components are reasonably designed, the carbon equivalent is controlled, Ti microalloy reinforcement is added, the content of P and S is controlled to be smaller than or equal to 0.015%, the content of N is controlled to be smaller than or equal to 70 ppm, the content of residual elements of Cu, Nb and the like is reasonably controlled, the LF is well sealed, the soft blowing flow of argon is reasonably controlled, molten steel is prevented from absorbing nitrogen, aluminum deoxidation is enhanced, the soft blowing time of the argon is properly prolonged, whole-process protective casting is adopted for the continuous casting, the pulling speed and the superheat degree are low, proper protective slag is selected, the straightening temperature is raised, continuously cast billet enters a pit to be slowly cooled, the tapping interval is well controlled in a rolling manner, the compression ratio is increased, and a reasonable heat treatment process is selected. The marine anchor chain round steel produced through the method is simple in procedure and low in cost, vacuum treatment is not needed, and the technical problems that marine anchor chain round steel produced at present is bad in surface quality, high in crack occurrence ratio, not stable in quality and the like are solved.

The invention discloses a no-hydrogen atmosphere protection heat treatment process completely without decarburization for steel. CO2 is fed in a gas generation furnace with activated carbons, and is chemically reacted with the activated carbons; a reaction product a is fed in a sealing atmosphere furnace with workpieces to be thermally treated; then, N2 is fed in the sealing atmosphere furnace to dilute the reaction product a; the contents of the reaction product a and N2 in the sealing atmosphere furnace are adjusted through comparing a set value of a carbon controller with a carbon potential measurement value in the atmosphere in the sealing atmosphere furnace to form a no-hydrogen protection atmosphere; the workpieces can be located in the no-hydrogen environment in the heating and insulation process of the heat treatment; the carbon potential in the atmosphere is always kept the same with the carbon content of the workpieces in the furnace; the workpieces generate no decarburization or recarburization through long-time stop under high temperature; the complete protection of the steel in the no-hydrogen environment is realized; and the decarburization problem of large and ultralarge workpieces manufactured by high-strength steel and ultrahigh-strength steel in the heat treatment in the field of aerospace is solved.

The invention mainly belongs to the field of metal smelting and particularly relates to a heat treatment method for an austenite stainless steel wire. The method comprises the steps that a material is pre-heated before annealing, and meanwhile the suitable annealing temperature is selected. The residual stress after drawing of the steel wire can be eliminated, the cold workability of the steel wire is improved, the shape of the steel wire is stabilized, meanwhile, the advantages of high technological practicability, low cost and the like are achieved, and the quality and production efficiency of the steel wire are improved significantly.

The invention relates to a galvanizing technology for high-strength fastening pieces. The technology consists of oil removing process, surface pre-treatment process, passivation process, hot-dip zinc process, centrifugation process and cooling process successively. In hot-dip zinc process, high-strength fastening pieces are subject to passivation treatment and then are immersed in zinc liquid at a temperature of 470-480 DEG C. for 40-60 seconds. After being treated with the galvanizing technology, zinc layer thickness of high-strength fastening pieces can meet the corresponding standard and surface hardness and strength thereof will not change basically.

The present invention discloses an electrochemical corrosion apparatus of reinforcing steel bar in seawater full immersion zone reinforced concrete. The electrochemical corrosion apparatus comprises a cathode for making dissolved oxygen in seawater obtain electron, an auxiliary anode and a direct current power supply, wherein the cathode, the auxiliary anode and seawater form an electrochemical oxygen filter after electrifying, the oxygen close to the concrete surface is converted into hydroxide radicals and/or hydrogen peroxide ions through the cathode, and the chlorine ions in the seawater move to close to the auxiliary anode under the effect of electric field force and generate chlorine gas under the effect of the auxiliary anode. According to the present invention, with the technical scheme, the dissolved oxygen in the reinforcing steel bar surface region is eliminated while the chlorine ions in the reinforcing steel bar surface passivation film can be damaged, such that the reinforcing steel bar can be used in the seawater for a long time; and during the diffusion process of the dissolved oxygen to the concrete structure, when the dissolved oxygen passes through the electrified low carbon steel net, the dissolved oxygen can be transferred to the carbon steel net surface as more as possible so as to be consumed, such that the oxygen is prevented from reaching the reinforcing steel bar surface.

The invention relates to a method for local ion nitriding of a deep cavity thread of a titanium alloy part, and belongs to the technical field of chemical heat treatment. The method comprises the steps of 1, manufacturing a nitriding tool according to the size and shape of the titanium alloy part; 2, carrying out vacuum annealing treatment on the nitriding tool; 3, wiping the titanium alloy part and the nitriding tool, and blow-drying the titanium alloy part and the nitriding tool through oil-free compressed air or nitrogen; 4, coating the outer wall of the titanium alloy part with the nitriding tool; 5, repeating the step 1 to the step 4 for n times, manufacturing n nitriding tools for coating the titanium alloy part, and enabling the n nitriding tools to be annularly and evenly arrangedon an ionization disc, wherein n is a positive integer; and 6, conducting nitriding treatment on the titanium alloy part. According to the method, the outer surface of the part and the non-nitrided part of the deep cavity are protected against a nitriding layer through tool design, and the temperature, time, atmosphere and electric parameters in the nitriding process are adjusted, so that the whole deep cavity thread obtains the hardness and nitriding depth of the nitriding layer meeting the technical requirements.

The invention discloses a structure for reinforcing corroded concrete through a prestress fiber reinforced composite sheet and a reinforcing method. The structure comprises a concrete member (3) to be reinforced, the prestress fiber reinforced composite sheet (1), stretching end anchorage device anchor bolts (5), a stretching end anchorage device (7), fixed end anchorage device anchor bolts (6), a fixed end anchorage device (8), non-prestress fiber reinforced composite sheets (9) and an external intermittent constant-current power source (11). The stretching end anchorage device (7) and the fixed end anchorage device (8) clamp the two ends of the prestress fiber reinforced composite sheet (1) correspondingly and fix the prestress fiber reinforced composite sheet (1) to the upper surface of the concrete member (3) to be reinforced. An inner reinforcement cage (4) is arranged in the concrete member (3) to be reinforced. According to the structure and the reinforcing method, the corrosion problem of steel bars and prestress anchorage devices in a concrete structure in the corrosive environment is solved, an auxiliary anode is resistant to corrosion and easy to replace, a reinforcing effect is achieved on the concrete structure, and the repairing cost is remarkably reduced.

The invention discloses medium-carbon high-chromium high-boron wear-resistant steel and a preparation method thereof. The prepared wear-resistant steel comprises, by weight percentage, 0.36-0.55% of carbon, 1.50-3.00% of silicon, 0.80-3.00% of manganese, smaller than 0.04% of phosphorus, smaller than 0.04% of sulfur, 9.00-15.00% of chromium, 0.30-3.00% of nickel, 0.10-1.00% of molybdenum, 0.10-0.50% of vanadium, 0-1.50% of tungsten, 0.01-0.10% of titanium, 0.40-0.80% of boron, 0.10-0.40% of copper, 0.10-0.30% of aluminum, 0.02-0.25% of niobium, 0.02-0.10% of zirconium, 0.10-0.50% of cerium, 0.01-0.15% of tin, 0.001-0.003% of magnesium, 0.001-0.15% of calcium, 0.003-0.025% of nitrogen, 0.001-0.005% of rhenium and the balance Fe. The obtained wear-resistant steel is high in hardness, good intoughness and resistant to wear.

The invention relates to the technical field of material surface engineering, and provides a method of electroplating a graphene-metal composite material plating layer by using complex pulses, a PCB and a motor. The method specifically comprises the steps: ionic liquid serves as electroplating liquid, graphene oxide is dispersed in the ionic liquid, and the ionic liquid further contains metal ions; and the graphene-metal composite material plating layer is deposited on a cathode substrate through current or voltage control pulses, wherein the current or voltage control pulses comprise a forward pulse period, a reverse pulse period and a pause period. The method is simple in process, low in cost, free of environmental pollution of traditional electroplating and capable of being applied to large-area coating or film production. The PCB comprises a base material plate and a bottom conductive wire. The graphene-metal composite material plating layer and the conductive wire are manufacturedthrough the method. According to the invention, the graphene-containing conductive wire is printed and wound on a PCB to form a brushless motor stator, so that a novel motor is provided.

The invention relates to a nickel-based alloy wire for welding of an LNG storage tank as well as a preparation method and a welding process. The nickel-based alloy wire comprises the following components in percentage by mass: 20.0%-23.0% of Cr, 0.0%-10.0% of Mo, 3.15%-4.15% of Nb, not more than 5.0% of Fe, not more than 1.0% of Co, not more than 0.50% of Mn, not more than 0.40% of Al, not more than 0.40% of Ti, not more than 0.50% of Si, not more than 0.10% of C, not more than 0.015% of S and the balance of Ni. The preparation method comprises the following steps of A, alloy smelting and casting into electrode rods; B, electroslag remelting; C, hammer cogging; D, hot roll annealing; E, acid pickling and grinding; F, drawing; G, dehydrogenation and straightening after hydrogen annealing treatment; and H, winding to be disc-like. The welding process is that the welding current is 360-380 A, the voltage is 26-28 V, and the welding speed is 50-100 cm/min and the current type is alternating current.

A method for reducing the degree of hydrogen embrittlement of the coating is to install an ultrasonic generator at the cathode end of the electroplating tank, and emit ultrasonic waves to the plated parts during the electroplating process. Utilize the cavitation effect generated by ultrasonic waves to bombard the small molecular hydrogen generated on the surface of the plated piece to make it detach, reduce the small molecular hydrogen on the surface of the plated piece, facilitate the deposition of metal atoms in the coating, produce a dense coating, and prevent hydrogen embrittlement. At the same time, it is beneficial to increase the speed of coating formation and improve production efficiency.

The invention relates to a method for electroplating zinc in neodymium iron boron magnet ionic liquid. According to the method, a neodymium iron boron magnet treated before plating is used as a cathode, a zinc sheet is used as an anode, the ionic liquid is adopted as electroplating liquid, under the magnetic stirring condition, a power supply is conducted, the temperature, the current intensity and the electroplating time are controlled for electroplating, and then, bright dipping, passivation and aging treatment are carried out. The method is applied to the neodymium iron boron magnet electroplating, the process is simple, the price of medicine is low, the operation temperature is low, more importantly, the hydrogen evolution reaction is avoided, the obtained plating layer is bright and compact, the combination of the plating layer and a base body is firm, and the corrosion resistance performance is good.

The invention discloses a cooperative air suction type liquid rocket engine propellant supply system which comprises a liquid oxygen storage tank, a liquid hydrogen storage tank, a liquid oxygen pipeline, a liquid hydrogen pipeline, a high-temperature incoming flow air pipeline, a helium pipeline and a rocket thrust chamber. A rocket belly is formed between the liquid hydrogen storage tank and therocket thrust chamber; the liquid hydrogen pipeline is positioned at the rocket belly and is linearly arranged; the high-temperature incoming flow air pipeline and the helium pipeline are wound at the outer side of the liquid hydrogen pipeline in parallel, and the helium pipeline is located between the two pipelines; a telescopic arm with a telescopic length is mounted on the side wall of an airinlet; when the telescopic arm is lengthened, the air inlet is pushed out from the rocket belly to realize an air suction working mode; and when the length of the telescopic arm is shortened, the airinlet is stored in the rocket belly, and a pure rocket working mode is achieved. According to the cooperative air suction type liquid rocket engine propellant supply system, oxygen in the atmosphere can be utilized, the layout of internal pipelines of a traditional liquid rocket engine is optimized, the liquid rocket engine has the high specific impulse and the large thrust-weight ratio, and therefore the launching cost is reduced.