44results about How to "Lessen the tendency to corrode" patented technology

A bromine-contained biocide used for public place and sewage treatment contains chlorine supplying agnet, bromide and stabilizer of bromine and chlorine in ratio of (50-85):(10-45):(5-15). Its advantages are long acting period, good corrosion inhibiting effect.

The invention discloses a fuel-cell bipolar plate with a nitrified and enhanced surface and a preparation method thereof and belongs to the technical field of fuel cells. The bipolar plate is prepared by the following steps of: preparing a nitrified layer, a chromium-nitride thin film and a carbon-based nano composite conductive thin film on the two side surfaces of a matrix of a stainless-steel plate or a titanium-alloy plate in sequence, cleaning and drying the matrix of the stainless-steel plate or the titanium-alloy plate, then putting the matrix in vacuum-arc ion-plating equipment, introducing nitrogen and hydrogen under the vacuum condition, starting bias voltage and hot wires, and preparing the nitrified layer; and introducing argon-nitrogen mixed gas, preparing the chromium-nitride thin film, opening a carbon target and preparing the carbon-based nano composite conductive thin film. The fuel-cell bipolar plate disclosed by the invention has the advantages that an ion nitrification technology is introduced into the field of surface modification of the fuel-cell bipolar plate, and the nitrified layer is prepared on the surface, so that the passivation of the matrix can be avoided, the condition that a coating fails due to corrosion can be effectively prevented; and a stepped transition method is adopted for multi-element composition of the chromium-nitride thin film and the nano composite conductive thin film, so that the peeling of the coating in the use process due to overlarge internal stress and oversmall bonding force is prevented.

The invention belongs to the technical field of biomedical materials and particularly relates to degradable biomedical Mg-Nd-Sr magnesium alloy as well as a preparation method and application thereof. The degradable biomedical Mg-Nd-Sr magnesium alloy comprises the following components in percentage by weight: 1.00-3.00% of Nd, 0.10-3.00% of Sr and the balance of Mg and unavoidable impurity elements. The preparation method of the alloy comprises the thermal treatment technology and the hot extrusion processing technology, Mg, Mg-Nd intermediate alloy and Mg-Sr intermediate alloy are sequentially smelted under the condition of covering agent protection, a refining agent is added for refining after the smelting, and after component detection, casting moulding is performed to obtain cast-condition degradable biomedical Mg-Nd-Sr magnesium alloy. Through reasonable thermal treatment technology and hot extrusion processing technology, polymorphic Mg-Nd-Sr magnesium alloy with excellent biocompatibility and different mechanical properties can be obtained, and the obtained polymorphic Mg-Nd-Sr magnesium alloy can be applicable to orthopaedic implant materials and intravascular stent medical materials of different occasions as demanded.

A high-potential Mg alloy used as consumable anode for the underground oil or gas pipeline, storage tank and water pipe is prepared through micro-alloying the Mg-Mn alloy by Mg-Ca and Mg-RE intermediate alloys, and refining by use of special refining agent to obtain Mg MnRECa alloy, which contains proportionally Mn, Ce, Ca, Si, Cu, Ni, Fe and Mg. Its advantages are high open-circuit potential 1.7-1.8 (-V) and high current efficiency (55-60%).

The invention discloses a preparation method of a magnesium alloy surface super-hydrophobic fluorine conversion coating. The super-hydrophobic fluorine conversion coating of a micro/nano structure isprepared on the surface of a magnesium alloy by the adoption of a liquid-phase growth and hydro-thermal treatment combined method. Through cleaning, polishing, preparation of a fluorine conversion layer and hydrophobization treatment, a porous hydrophobic coating of a micro/nano structure is formed on the film layer. The contact angle of the coating in simulated body fluid reaches 150 degrees, thecontact area between a magnesium alloy sample and the liquid can be reduced, the corrosion current density of the magnesium alloy can be lowered by 3 grades, and the impedance magnitude is increasedfrom 12000 omega.cm<2> to 1400000 Omega.cm<2> and is increased by 100 times. The preparation method of the hydrophobic coating of the nano-structure is simple, equipment is simple and easy to control,cost is low, and the controllability is good.

The invention discloses a composite coating material based on a 45# steel substrate and a preparing method of a coating. The coating comprises, by weight percent, 0% to 10% of WC powder, 0% to 1% of Y2O3 powder, and the balance 304 stainless steel powder. The WC powder, the Y2O3 powder and the 304 stainless steel powder which are prepared according to the ratio are mixed and are added into a ball milling tank together with ball milling media, and after ball milling is carried out for 4h to 6h, mixed powder is obtained; the mixed powder is subject to drying treatment under the vacuum environment, and the coating material is obtained; the surface of the 45# steel substrate is ground to be flat; a dedicated powder preset tool is used for flatly laying the coating material on the surface of the 45# steel substrate; and finally, laser heat treatment equipment is used for carrying out laser cladding on the material, and the coating is obtained. The obtained coating has the good wear resistance, and higher corrosion resistance, the preparing technology is simple, the cost is low, and batch production is easily achieved.

An apparatus and method for prevention of corrosion with the cooling system of an internal combustion engine is disclosed. The apparatus includes a pressurized inert gas source and a fluid delivery system whereby the gas is dispersed within the cooling system to expel corrosion inducing fluids such as oxygen and water vapor. Methods of use are also disclosed.

The invention discloses an anti-corrosion method of a nickel-based alloy heating tube, belonging to the anti-corrosion technical field. The method comprises the following steps of: polishing the nickel-based alloy heating tube matrix to No.800 by using abrasive paper, cleaning by using de-ionized water and alcohol in sequence and drying; uniformly mixing PEG200 (Polyethylene Glycol 200), PEG20000, TEOS (Tetraethyl Orthosilic), HCl and H2O in a mole ratio of (0.00293-0.0066):(0.0022-0.00587):0.1:13:100; reacting in a sealed way at 80 degrees centigrade for 3 h; aging for 3 d for later use; immersing the processed matrix in the prepared solution; lifting at constant speed of 10 cm/min; putting a sample in a muffle furnace; increasing temperature to 540 degrees centigrade at a speed of 2 degrees centigrade per minute; keeping temperature for 10 h; and naturally cooling to obtain a silicon dioxide film. The method disclosed by the invention has a simple process and good controllability. The prepared silicon dioxide film is compact and uniform and does not contain pores and bubbles.

The invention discloses a method for inhibiting corrosion of a hydraulic steel structural part by adopting a strong electrolyte solution. The method comprises the specific steps that 1, strong electrolyte is added into a solution in which the hydraulic steel structural part is located till the conductivity of the water solution is larger than 20000 microseconds per centimeter, and then the protected hydraulic steel structural part and a titanium anode are connected through a wire to form a closed loop; 2, after a period of time of polarization, the electric potential of the hydraulic steel structural part is measured; and 3, if the surface electric potential of the hydraulic steel structural part is lower than -0.85 V, it is indicated that corrosion of the hydraulic steel structural part is inhibited; if the surface electric potential of the hydraulic steel structural part is higher than -0.85V, the steps 1 and 2 are executed again till the surface electric potential is lower than -0.85V; and the strong electrolyte is strong acid and strong alkali salt. By the adoption of the method for inhibiting corrosion of the hydraulic steel structural part by adopting the strong electrolyte solution, metal can be prevented from continuing to be oxidized and corroded, the corrosion characteristic of the solution can be further changed by adjusting the conductivity of the reaction solution in which metal is located, and metal corrosion tendency is relieved.

The invention provides a brazing filler metal alloy, brazing filler metal, a preparation method and application of the brazing filler metal alloy, a preparation method and application of the brazing filler metal and a prepared brazing product, and relates to the technical field of welding materials. On the basis of traditional Zn-Al based brazing filler metal, the brazing filler metal alloy is prepared by adding Mg, Ni, Cr, Ga and rare earth elements according to the specific component proportion. In the brazing filler metal alloy, the strength of the brazing filler metal can be improved through Ni; the electrode potential of the brazing filler metal can be improved through Mg; by means of Cr, a compact oxidization film can be formed, and the corrosion rate can be reduced; by means of Ga,the adhesion of corrosion products can be improved, so that the surface of the brazing filler metal is evenly covered with the corrosion products, and the exposed area of the brazing filler metal is reduced; and by means of the rare earth elements, grains can be refined, the interface can be purified, and the intergranular corrosion tendency can be reduced. Through the reasonable proportion between the components, the synergistic interaction function can be achieved, the brazing strength of the brazing filler metal is improved, it is guaranteed that the brazing filler metal has good corrosionresistance, and the existing process need of aluminum-copper material brazing connection can be met fully.

The invention relates to a component (100) with at least two subcomponents made of metal. According to the invention, an alloy layer (140) is applied to the surface of a valve funnel (110) functioning as the subcomponent in a valve (100) functioning as the component, wherein the alloy layer (140) is made from a metal less noble than the valve funnel (110). The alloy layer (140) is arranged on a portion of the valve funnel (110) which is situated outside the direct mechanical action region (150) of the closing member (160) functioning as the second subcomponent, and is arranged as an annular portion running around the surface of the valve funnel (110), outside the mechanical action region of the closing member (160) relative to the closing member (160) resting in the valve seat (120) of the valve funnel in the closed state.

The invention relates to a TiAlMoNbW high-entropy alloy nitride film and a preparation process thereof, the component expression is TiaAlbMocNbdWeNx, a: 4-9, b: 4-8, c: 1-6, d: 6-10, e: 5-9, x: 55-70, a + b + c + d + e + x = 100, the film is of a columnar nanocrystalline structure, and the grain size is 10-70 nm. The high-entropy alloy nitride film has high wear resistance, high corrosion resistance and high mechanical property.