58results about How to "Reduce intergranular corrosion" patented technology

The invention relates to an aluminium alloy material for a radiator fin, which is characterized by comprising the following components in percentage by weight: 0.5-1.2wt% of Si, 0.5-1.8wt% of Mn, 0.25-1.8wt% of Zn, 0.30-0.55wt% of Cu and the balance of Al and inevitable impurities. The aluminium alloy material disclosed by the invention has the advantages of high strength property and solderability, excellent corrosion resistance and good machinability, and is especially suitable to serve as the radiator fin.

The invention provides a technological method for improving the equiaxed crystal ratio of bistable ferrite stainless steel continuous casting billets. The technological method comprises the steps of aprimary melting furnace, AOD, VOD, LF and continuous casting. According to the technological method provided by the invention, the equiaxed crystal ratio of the bistable ferrite stainless steel continuous casting billets is improved largely, and the cold machining and molding performances of ferrite stainless steel as well as the surface quality of products are improved; and the problems of nozzle clogging and blockage caused by TiN and TiOx generated by adding excessive Ti in the continuous casting technological process are solved effectively.

The invention discloses a zinc-base alloy. The zinc-base alloy is a Zn-Al-Cu-Mg series alloy and comprises the following elements in percentage by mass: 4%-5.5% of aluminum, 0.8%-1.2% of copper, 0.05%-0.08% of magnesium, not more than 0.02% of iron, not more than 0.001% of lead, not more than 0.002% of cadmium, not more than 0.001% of tin, and the balance of zinc and inevitable impurities, wherein the content of the zinc is no less than 94%, and the total content of the impurities is not more than 0.02%. By the manner, the zinc-base alloy is low in the content of detrimental impurities, has high corrosion resistance, high strength and high wear resistance and is suitable for the casting of metal ornaments and accessories which are high in accuracy and complicated in structure; and castings have high surface quality and are difficult to fracture.

The invention discloses a special-shaped stretch-formed heat insulation lunch box and a preparation method thereof, and belongs to the technical field of heat insulation lunch boxes. The preparation method includes an outer shell special-shaped constant-temperature stretch-forming process, an inner container special-shaped constant-temperature stretch-forming process, an outer shell inner container special-shaped welding process, an interlayer vacuum process and a lunch box surface treatment process; the outer shell special-shaped constant-temperature stretch-forming process includes the following steps of three times of stretching, vacuum solid solution stress relief, shaping, pre-edge trimming, laser opening flatting and other steps; and the inner container special-shaped constant-temperature stretch-forming process includes the following steps of three times of stretching, secondary vacuum solid solution stress relief, secondary shaping, secondary pre-edge trimming, secondary laseropening flatting, special-shaped rotating opening flattening and other steps. The process mass production processability of products is met through multiple times of special-shaped stretch-forming, side walls are prevented from cracking, meanwhile, thick and big internal molecular lattice of a material after multiple times of forming is improved through vacuum solid solution stress relief treatment, stress relief in steps is not needed, and the outline smoothness and heat insulation effectiveness of the products are improved.

The invention relates to a novel positive grid lead-calcium alloy for a lead-acid storage battery. The alloy is prepared from components in percentage by weight as follows: 0.05%-0.12% of calcium, 0.5%-1.5% of tin, 0.06%-0.11% of bismuth, 0.07%-0.15% of rare earth elements and the balance of lead, wherein the rare earth elements are one or more of ytterbium, gadolinium and lanthanum. The ingredients of the grid alloy are improved by adding tin, bismuth, the rare earth elements and other additives, and a novel deep-cycle and maintenance-free grid alloy material for the lead-acid storage batterywhich is corrosion-resistant, good in charging property and mechanical property and long in cycle life is obtained.

The invention discloses a porous zinc-tin alloy negative electrode material for a zinc-air battery and a preparation method of the porous zinc-tin alloy negative electrode material, belonging to the field of new energy technology development. The porous zinc-tin alloy negative material comprises a foamed nickel substrate and a zinc-tin alloy plating layer, wherein the zinc-tin alloy plating layer is uniformly coated on the foamed nickel substrate, tin and zinc in the zinc-tin alloy plating layer are uniformly distributed, and the mole ratio of tin to zinc is (0.01-0.20):1. In the porous zinc-tin alloy negative electrode material, foamed nickel is taken as a negative electrode, electroplating is carried out in an electroplating liquid containing a complexing agent to obtain the porous zinc-tin alloy negative electrode material, and the electroplating liquid containing the complexing agent is selected from one of a pyrophosphate system electroplating liquid, a gluconate system electroplating liquid, a citrate system electroplating liquid and a tartaric acid system electroplating liquid. The porous zinc-tin alloy negative electrode material has the advantages that the material structure is reasonable in design, the preparation process is simple, and industrial application and production at a large scale are promoted.

The invention discloses a non-spangle friction-resisting hot dipping K-S-B zinc aluminum alloy and a machining process. The alloy comprises, by weight percent, 0.2 to 0.3% of K, 2.0to 2.5% of Mg, 1.0to 1.8% of Ca, 20.0 to 28.0% of Al, 0.2 to 0.3% of Se, 0.6 to 0.8% of In, 0.1 to 0.2% of B, 0.2 to 0.3% of S and the balance zinc. The hot dipping K-S-B zinc aluminum alloy and the process of the alloy solve the key problem in the hot-dip galvanizing aluminum alloy application research and industrialization, a final product has the excellent corrosion resistance property and the non-spangle surface state, and the material can be widely applied in the near future.

The invention belongs to the technical domain of enduring corrode metal material, especially, it relates to the zinc-base aluminium-magnesium-lanthanide alloy resisting the corroding and the producing process. The adopted technical process: the 75-85wt% zinc, the 0-1wt% lanthanide, the 12-18wt% aluminum and the 2-8wt% magnesium are placed into the heating stove, the temperature is heated up to 800-950 to melting, the temperature keeps 10-30 minutes or the material is milled 10-30 minutes. It casts under the temperature of 550-650, or, it mould to preprocessing material. The alloy produced from the invention has many merits such as the resisting causticity chronically, the good machine capability, the low melting point, the low proportion and the low cost. It is fit for the producing the engine part resisting the corrupt and sacrificing the anode material and machining to powder to produce the zinc-base aluminium-magnesium-lanthanide alloy resisting the corroding, so it is important to the project resisting the corrupt of the changing river such as the water conservabcy, the haven, the bridge and the watercraft.

The invention relates to preparation for a low-weightlessness rare earth-iron-boron magnetic body, and belongs to the field of magnetic materials. The preparation comprises the following steps of smelting, hydrogenating, powdering making, powder mixing, orienting and forming, sintering and aging treatment. According to the technical scheme, in the powder mixing process of preparation of a rare earth-iron-boron magnetic body, RE-MM-N nano-alloy is added to rare earth-iron-boron magnetic powder, after sintering and aging heating treatment are carried out, RE-MM-N nanometers are distributed on a grain boundary phase in a scattering mode, the grain boundary of the rare earth-iron-boron magnetic body is strengthened, the difference between the grain boundary abundant RE corrosion potential and the main corrosion potential is lowered, the intergranular corrosion is lowered, the corrosion resistance of the grain boundary phase in the environment of high temperature and high humidity is improved, and the weightlessness of the rare earth-iron-boron magnetic body is lowered. Compared with the general technology of preparing the rare earth-iron-boron magnetic body, the weightlessness is achieved.

The invention provides a zinc alloy which comprises the following components in percentage by mass: 3.5-6.0% of aluminum, 0.5-1.8% of copper, 0.02-0.05% of magnesium and the balance of zinc and other impurities, wherein the iron content is not greater than 0.1%, the lead content is not greater than 0.03%, the cadmium content is not greater than 0.01%, and the tin content is not greater than 0.01%. When preparing the zinc alloy, the solution temperature is controlled at 390-410 DEG C, and detrimental impurities are controlled within the specified range to obtain the zinc alloy satisfying the RoHS standard, thereby lowering the damage to the human body and environment.

The invention relates to an aluminium alloy material of a radiator heat pipe, which is characterized by comprising the following components in percentage by weight: 0.5-1.2wt% of Si, 0.5-1.8wt% of Mn, 8.5-23.5wt% of Zn, 0.20-0.60wt% of Fe and the balance of Al and inevitable impurities. The aluminium alloy material disclosed by the invention has the advantages of high strength property and solderability, excellent corrosion resistance and good machinability, and is especially suitable to serve as the radiator heat pipe.

The present invention relates to a copper-nickel alloy, which comprises (wt%), 9-11% of Ni, 0.5-0.8% of Fe, 0.005-0.01% of boron, less than or equal to 0.13% of Si, 0.04-0.06% of Sn, and the balance of copper. The heat exchange plate manufactured from the copper-nickel alloy has advantages of low cost, high strength characteristic, high solderability, excellent corrosion resistance, and good workability.

The invention discloses a stainless-steel and carbon-steel composite plate and a preparation method thereof. The stainless-steel and carbon-steel composite board is manufactured by stacking and compositing of a carbon-steel plate, a stainless-steel plate, a stainless-steel plate and a carbon-steel plate in sequence, wherein the carbon-steel plate comprises the following metal components in percentby weight: 0.15-0.20% of C, 0.19-0.35% of Si, 0.5-1.0% of Mn, 0.02-0.025% of S, 0.023-0.025% of P, 0.04-0.06% of Cr, 0.02-0.05% of Nb, 0.04-0.06% of Al, 0.40-0.60% of Ni and the balance of Fe; the stainless-steel plate comprises the following metal components in percent by weight: 0.07-0.075% of C, 0.65-0.75% of Si, 1.4-1.8% of Mn, 0.003-0.01% of S, 0.035-0.04% of P, 18-20% of Cr, 8.5-13% of Ni,0.02-0.05% of Nb, 0.10-0.15% of Al, 0.30-0.45% of Cu, 0.18-0.20% of Ti and the balance of Fe. The stainless-steel and carbon-steel composite plate and the preparation method disclosed by the inventionhave the beneficial effects that the corrosion resistance is good and the phenomenon of intercrystalline corrosion can be effectively reduced.

The invention provides zinc alloy. The zinc alloy comprises, by weight percent, 3.5%-4.3% of aluminum, 0.1%-0.25% of copper, 0.05%-0.1% of magnesium, the balance of zinc and other impurities, not larger than 0.1% of iron, not larger than 0.005% of lead, not larger than 0.004% of cadmium, and not larger than 0.003% of tin. Melt temperature is controlled at 390-410 DEG C during production of the zinc alloy. Detrimental impurities in the zinc alloy are controlled within the range specified by the RoHs (restriction of hazardous substances) regulation. The performance of the zinc alloy is improved, and harm to environment and human health is reduced.

The invention provides zinc alloy. The zinc alloy comprises, by weight percent, 3.9%-4.3% of aluminum, 0.03%-0.06% of magnesium, the balance of zinc and other impurities, not larger than 0.03% of copper, not larger than 0.1% of iron, not larger than 0.005% of lead, not larger than 0.003% of cadmium, not larger than 0.002% of tin. Melt temperature is controlled at 390-410 DEG C during production of the zinc alloy, and the produced zinc alloy meets the RoHs (restriction of hazardous substances) standard of European Union. Overall performance of the zinc alloy is improved, resources are saved, and pollution is lowered.

The invention relates to an aluminium alloy material for a radiator cooling fin, which is characterized by comprising the following components in percentage by weight: 0.3-0.85wt% of B, 0.5-1.8wt% of Mn, 10.5-27.5wt% of Zn, 0.05-0.30wt% of Ni and the balance of Al and inevitable impurities. The aluminium alloy material for a radiator cooling fin has the advantages of high strength property and solderability, excellent corrosion resistance and good machinability, and is especially suitable to serve as the radiator cooling fin.

The invention relates to an antibiotic corrosion resistant heat exchanger aluminum pipe, which is characterized by being prepared from the following materials: 0.3 to 0.85 weight percent of B, 0.5 to 1.8 weight percent of Mn, 10.5 to 27.5 weight percent of Zn, 0.05 to 0.30 weight percent of Ni, 0.01 to 0.02 weight percent of Ag and the balance Al and inevitable impurities. Security compass web application auditing tool (SWAAT) experiments are adopted for testing the corrosion behavior of the alloy material and show that the corrosion resistance of the aluminum alloy is obviously improved, and in addition, the heat exchanger aluminum pipe has good antibacterial property and has more than 99 percent antibacterial rate on colon bacilli and staphylococcus aureus.

The invention relates to a storage battery grid alloy and a preparation method thereof, which belong to the technical field of lead acid storage battery production, and solves the problem that environmental pollution is caused as existing grid alloy contains metal calcium, and lead slag is easily oxidized and generated in a smelting process. The storage battery grid alloy provided by the inventioncomprises 0.5-5% of a MAX-phase ceramic material, and the balance of pure lead; in the MAX-phase ceramic material, M is a transition metal element, A is a Sn element, and X is a carbon element. The preparation method for the storage battery grid alloy comprises the following steps: step 1, adopting a high-temperature microwave solid-phase synthesis method to prepare the MAX-phase ceramic material; step 2, preparing a mother alloy ingot; and step 3, forming the grid alloy. The MAX-phase material is adopted, so that inter-crystalline corrosion of the grid alloy is obviously reduced, the structure of an alloy crystalline grain interface is improved, strength, corrosion resistance, creep resistance, and the like of the alloy are remarkably improved.