109results about How to "Reduce corrosion rate" patented technology

The invention relates to the technical field of welding devices, in particular to an aluminum alloy door and window welding machine which comprises a mounting support, an air cylinder is mounted at the upper end of the mounting support, an output shaft of the air cylinder penetrates through the mounting support, and a welding mechanism is mounted on the output shaft of the air cylinder and comprises a first mounting plate fixedly connected with the output shaft of the air cylinder. An exhaust mechanism is mounted on the other side of the first mounting plate, four sets of first electric telescopic rods are mounted on the inner side of the mounting support, clamping mechanisms are mounted on output shafts of the first electric telescopic rods, and welding seams between arc-shaped window frames can be welded through mutual cooperation of second electric telescopic rods and first welding heads; and welding can be conducted on inner side welding seams of the assembling grooves, welding is more comprehensive, connection between the arc-shaped window frames is more stable, through mutual cooperation of a fourth gear and a third electric telescopic rod, comprehensive cleaning is conducted on the peripheries of the welding seams, cracks and bubbles during welding are avoided, and the welding seams are firmer.

The invention discloses high-performance anti-fatigue steel for ocean engineering and a production method of the high-performance anti-fatigue steel. The steel comprises the following chemical components: 0.02%-0.07% of C, 0.10%-0.25% of Si, 1.75%-2.50% of Mn, 0.022%-0.026% of P, less than or equal to 0.008% of S, 0.065%-0.070% of Nb, 0.070%-0.075% of V, 0.035%-0.042% of Ti, 1.25%-1.45% of Cr, 1.25%-1.45% of Ni, 0.30%-0.35% of Co, 0.035%-0.045% of Als, 0.0150%-0.0260% of N, 0.45%-0.50% of Cu, 0.03%-0.05% of Sb and 0.03%-0.05% of RE. Through smelting, slab continuous casting, casting blank heating, rolling, cooling and heat treatment, the Rp0.2 of the steel is 690-750 MPa, A is larger than or equal to 20%, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, the corrosion resistance rate is smaller than 0.090 mm / a, the fatigue life under the peak stress load of 350 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 40%. The problems that an existing steel plate for ocean engineering is low in strength, poor in low-temperature impact toughness and insufficient in corrosion resistance and fatigue resistance are solved.

The invention discloses a water-based flux cleaning agent for integration, and belongs to the field of semiconductor cleaning agents. The water-based flux cleaning agent is prepared from the following raw materials in percentage by weight: 30-50% of alcohol ether solvent, 1-5% of organic amine, 3-5% of gemini imidazoline corrosion inhibitor and 40-70% of deionized water, wherein the sum of the weight percentages of the raw materials is 100%. According to the water-based flux cleaning agent, the imidazoline corrosion inhibitor is adopted, so that a remarkable cleaning effect on flux residues, soldering paste and fine particles on a semiconductor electronic device is achieved, meanwhile, the brightness of welding spots can be maintained, the surface insulation performance is good, the metal surface of an IPM module can be effectively prevented from being oxidized, and the service life of the IPM module is prolonged. The cleaning agent is especially suitable for cleaning pollutants in the welding process of semiconductor chips, chip type capacitors and circuit substrates.

The invention discloses incombustible water-based aerosol spray paint and a preparation method thereof, and relates to the technical field of spray paint. When the non-combustible water-based aerosol spray paint is prepared, firstly, p-(triethoxysilyl) acetophenone reacts with trimethylchlorosilane, and then the reaction product and tetramethyl tetravinyl cyclotetrasiloxane are subjected to ring opening polymerization to obtain modified polysiloxane; grafting epoxy resin with 4-vinyl-methyl benzoate, reacting with modified polysiloxane to obtain modified epoxy resin, and emulsifying to obtain a modified epoxy resin emulsion; secondly, reacting the silicon dioxide subjected to acylating chlorination with 4-hydroxy-2, 2, 6, 6-tetramethylpiperidine nitroxide free radicals, reacting with 3-(3-thienyl) propionaldehyde, and reacting with thiophene and 3-vinyl thiophene to obtain modified silicon dioxide; and finally, mixing the modified epoxy resin emulsion, pure water, the modified silicon dioxide, a curing agent and a photoinitiator to prepare the incombustible water-based aerosol spray paint.

The invention relates to the technical field of water treatment, and discloses a water treatment agent for oilfield reinjection water and a preparation method thereof. The water treatment agent for oilfield reinjection water is obtained by copolymerization of sulfonic imidazoline quaternary ammonium salt modified quinoline, Mannich base modified chitosan, acrylic acid and sodium hypophosphite. The water solubility and corrosion inhibition of imidazoline are improved through quaternization modification of imidazoline, quaternary ammonium salt imidazoline can be adsorbed on the metal surface, the corrosion rate is reduced, the quaternary ammonium salt imidazoline serves as a surface active agent, the infiltration and dispersion effects are achieved, and the descaling rate is increased; the sulfonic acid group improves the temperature resistance and prevents the generation of gel, and the strong hydrophilicity of the sulfonic acid group enables a molecular chain to fully stretch in water, so that the scale inhibition performance is improved; mannich base is introduced into chitosan, the acid solubility and temperature resistance of chitosan are improved, the coordination chelation effect of chitosan is enhanced through the conjugation effect of aromatic rings, and the corrosion inhibition effect is improved; various functional groups play a synergistic effect, so that the corrosion and scale inhibition effect is further enhanced.

The invention discloses a bio-based gemini quaternary ammonium salt compound as well as a preparation method and application thereof. The bio-based gemini quaternary ammonium salt compound is a compound with a structural formula as shown in a formula I, wherein R1 is selected from one of cyclohexanone, cyclopentanone, acetone, 2-octanone and 2-pentanone; r2 is selected from C4-C24 alkyl groups (except C19 and C21); x is at least one of Cl, I and Br. The bio-based gemini quaternary ammonium salt compound disclosed by the invention takes 5-hydroxymethylfurfural as a raw material, has a furan ring, a quaternary ammonium salt substituent group and a long alkyl chain in the structure and can be used as a corrosion inhibitor, and a quaternary ammonium salt functional group and an alkyl long chain are constructed in the structure and respectively serve as a hydrophilic functional group and a hydrophobic functional group, so that the biological activity of the compound is improved. When the gemini quaternary ammonium salt corrosion inhibitor is in contact with steel (metal), a protective film can be formed on the surface of the steel (metal), so that the effect of protecting the steel (metal) is achieved, the corrosion speed of the steel (metal) is slowed down, and the economic benefit is extremely high; # imgabs0 #

The utility model relates to the technical field of garbage furnaces, in particular to a large garbage waste heat furnace structure which can reduce the temperature of high-temperature superheated flue gas so as to reduce the corrosion rate, is small in transformation degree and easy to realize, and comprises a fire grate, a hearth, a second flue, a third flue, a horizontal flue and a tail flue, a first evaporator, a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater are sequentially arranged in the horizontal flue in the flue gas direction, and flag type evaporators are installed in the second flue and the third flue. A space is reserved between the high-temperature superheater in the horizontal flue and the first evaporator, a second evaporator is arranged in the space, and the number of the low-temperature superheaters is reduced to one group.

The invention relates to the technical field of composite biological coatings. Specifically, the invention relates to a hydrophobic composite layer on a medical degradable magnesium alloy matrix and a preparation method of the hydrophobic composite layer. In the preparation method, firstly, a porous ceramic oxide layer is formed on a magnesium alloy matrix through micro-arc oxidation treatment, so that the corrosion rate of the magnesium alloy is reduced; then, a strontium-doped hydroxyapatite layer is prepared on the surface of the micro-arc oxidation layer by using a chemical deposition method, so that the biocompatibility of the magnesium alloy is improved; and finally, dipping and pulling the magnesium alloy subjected to micro-arc oxidation and chemical deposition treatment in a polylactic acid solution containing nano-hydroxyapatite for one time or multiple times, so as to form a hydrophobic polymer layer. According to the hydrophobic composite layer prepared by the method, the corrosion resistance and the biocompatibility of the magnesium alloy are improved at the same time. The invention also relates to a magnesium alloy implant article comprising the hydrophobic composite layer.

The present application relates to a kind of corrosion liquid and macro etching method for low alloy ultra-high strength steel, the volume concentration of nitric acid in its corrosion liquid is (1.2+1.4*CE)% to (1.5+1.8*CE)%, the volume concentration of low carbon alcohol is 40%~50%;Acid fluorine salt mass concentration is (1.0+1.4*ASI)g / L to (1.4+1.8*ASI)g / L, the mass concentration of thiourea or its derivative is (0.5+1.5*HDI)g / L to (0.8+2.0*HDI)g / L;The balance is water;CE=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15, ASI=Nb+Ti+0.5* (V+Al), HDI=(C+Mn / 5+Cr / 3+Mo / 2+V / 2)*(1+Nb+Ti+B), above-mentioned element symbol is the mass percentage value of the element in the steel to be etched.The present application can solve the technical problems that the over-etching window of conventional etching liquid is difficult to control, weld and heat-affected zone is prone to over-etching, and corrosion duration control is seriously dependent on artificial experience, and the consistency of detection result is poor.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

The utility model relates to a maritime work mass concrete pile foundation anti-corrosion device which comprises an outer-layer protective shell, a middle-layer spacing shell and an inner-layer anti-corrosion shell, and the outer-layer protective shell, the middle-layer spacing shell and the inner-layer anti-corrosion shell are all cylindrical shells formed by assembling two semi-cylindrical shells. The inner-layer anti-corrosion shell, the middle-layer spacing shell and the outer-layer protection shell are sequentially arranged on the outer side of a concrete pile foundation in a sleeving mode from inside to outside, a first reaction cavity is formed between the outer-layer protection shell and the middle-layer spacing shell, and a second reaction cavity is formed between the inner-layer anti-corrosion shell and the middle-layer spacing shell. A plurality of first reaction rods are horizontally arranged on the middle-layer interval shell in an array mode, a plurality of second reaction rods are horizontally arranged on the inner-layer anti-corrosion shell in an array mode, and hydrophobic materials used for reducing the seawater permeation speed are clamped between the connecting pieces at the two ends of the two semi-cylindrical shells. And the anti-corrosion capability of the concrete pile foundation is obviously improved.

The utility model discloses an oil and gas pipeline grounding device which comprises a grounding fixing main body, a fixing head and a protective cover, the appearance of the grounding fixing main body is of a three-dimensional box body structure, and a three-dimensional space used for installing the fixing head is arranged in the grounding fixing main body. The fixing head is fixedly and stably connected with a round hole in one side of the grounding fixing body through a connecting piece, the top side of the fixing head is provided with a crimping groove recessed towards the inner center of the fixing head, one end of the crimping groove is communicated with the round hole in one side of the grounding fixing body through an inner through hole of the connecting piece, and a grounding wire is connected in the crimping groove. A long-strip-shaped crimping sheet matched with the crimping groove is arranged in the crimping groove. According to the utility model, the connection between the grounding wire and the oil-gas pipeline is more convenient, stable, safe and reliable, the corrosion rate is effectively reduced, the service life of the grounding wire is prolonged, the later maintenance of the grounding wire is facilitated, the maintenance cost is saved, and the oil-gas transmission safety is ensured.

The invention discloses a production method for anodizing, chambering and corroding an electrode foil, belongs to the technical field of electrode foils, and adopts ultrasonic waves to generate a cavitation effect in liquid, promote a corrosion process and improve uniform hole forming and performance of an aluminum foil. A domestic plain aluminum foil of 132 microns is used, and proper holes are obtained through three-stage treatment of alkali washing, hole-forming corrosion and chambering corrosion and hole-forming corrosion of a mixed solution composed of sulfuric acid and hydrochloric acid. The polyethyleneimine is added into a reaming phosphoric acid solution to slow down corrosion, aluminum foil holes subjected to three-stage treatment contain Cl <->, metal impurities, phosphoric acid and the like, corrosion is caused to products, and the quality of oxidation films is reduced. Impurities are cleaned through dilute nitric acid, a compact and firm oxidation film is obtained, then sol-gel coating and subsequent formation treatment are carried out, the anode formation chambering corrosion electrode foil is obtained, and the specific capacitance of the foil is effectively improved.

The invention relates to the technical field of pool construction, and discloses a bidirectional arc rib super-rigidity large-module pump box integrated pool and a construction method thereof.The bidirectional arc rib super-rigidity large-module pump box integrated pool comprises a concrete bottom plate, the concrete bottom plate is provided with a pool and a pump room, and the pool is connected with the pump room through a pipeline; the pool comprises composite large modules, a supporting assembly and a cover plate, the multiple composite large modules are installed on a concrete bottom plate, the cover plate covers the composite large modules, and the concrete bottom plate, the composite large modules and the cover plate define a cuboid pool structure; the supporting assembly is arranged in the water pool and is supported and connected among the concrete bottom plate, the composite large module and the cover plate; and the composite large module is a bidirectional arc rib stainless steel plate. The pump box integrated design of the water pool is realized; the supporting assembly reinforces the pool in all directions; the composite large module is arranged to be a bidirectional arc rib stainless steel plate, the rigidity of the pool is improved, and the tonnage of the water tank is improved.

The invention relates to the technical field of ammonia synthesis, and discloses a low-consumption conversion ammonia-containing wastewater separation and treatment device which comprises an ammonia washing tower, a comprehensive flash evaporator, an alternating-current cooler, a stripping tower and a tail gas separation tank. The first ammonia washing tower and the second ammonia washing tower are arranged in parallel, bottom outlets are communicated to the comprehensive flash evaporator through a seventh adjusting valve and an eighth adjusting valve, high-pressure ammonia-containing condensate is throttled and depressurized, and physical turbulent flow is induced in the flash evaporator to accelerate desorption of acid gas. And the flash evaporation lower liquid enters the cold side of the alternating current cooler through a condensate pipeline, absorbs heat from a gas phase at the top of the stripping tower for preheating, and then enters the stripping tower for countercurrent deep stripping. Purified condensate generated at the bottom of the stripping tower is discharged out of the system, and a tower top gas phase is fed into a tail gas separation tank for gas-liquid separation after being subjected to heat exchange by an alternating-current cooler and cooling by a circulating water cooler. Through high-pressure flash evaporation pretreatment and an internal thermal coupling mechanism, the saturated steam consumption of a steam stripping section is reduced, and the problems of crystal blockage and equipment corrosion are solved.

The invention discloses a two-way anti-leakage, extended-life, recyclable tail shaft front sealing device, which relates to the technical field of tail shafts. The two-way anti-leakage, extended-life, recyclable tail shaft front sealing device comprises a first sealing mechanism, a second sealing mechanism is arranged on the inner side of the first sealing mechanism, a protective ring is fixedly connected to the surface of the first sealing mechanism, a gas filling valve is fixedly connected to the surface of the first sealing mechanism, the gas filling valve is located on the inner side of the protective ring, and a docking ring is slidably connected to the inner side of the first sealing mechanism. The two-way anti-leakage, extended-life, recyclable tail shaft front sealing device ensures the ease of replacing rubber pads of the device, and ensures that when the rubber pad is corroded by seawater after being used for a period of time and fails to achieve good anti-leakage performance, the docking ring can be easily separated from the first sealing mechanism and the rubber pad can be replaced, thereby improving the ease of replacing the rubber pad between the first sealing mechanism and the second sealing mechanism.

The invention relates to the technical field of coating preparation, and particularly discloses a long-acting anti-corrosion alloy coating formula and a preparation method thereof. The raw material is composed of a component A and a component B, wherein the component A comprises 30-50 parts of polyurethane, 20-40 parts of aluminum-zinc alloy powder, 5-7 parts of titanium dioxide, 6-8 parts of talcum powder, 1-3 parts of a defoaming agent, 1-3 parts of a thickening agent and 20-40 parts of water; the component B is a curing agent; the preparation method of the long-acting anti-corrosion alloy coating comprises the following steps: S1, stirring and mixing polyurethane, aluminum-zinc alloy powder, titanium dioxide, talcum powder, a defoaming agent, a thickening agent and water, and grinding to obtain a mixture; and S2, adding a curing agent into the mixture, stirring and mixing, centrifugally filtering, and grinding to obtain the anti-corrosion alloy coating. By designing the raw materials and the proportion, the prepared anti-corrosion alloy coating has relatively high corrosion resistance, wear resistance and excellent metal substrate adhesive force, and long-acting corrosion resistance can be realized.

The present application provides a kind of low load under coal mill outlet wind powder temperature regulating system and method, including temperature sensor group, flow sensor, coal dust concentration sensor, temperature regulating device and control unit, wherein: temperature sensor group is used to measure the wind powder temperature of different positions of coal mill outlet pipeline;Flow sensor is used to measure the wind powder flow of different positions of coal mill outlet pipeline;Coal dust concentration sensor is used to detect the coal dust concentration in the coal mill outlet pipeline;Temperature regulating device is used to adjust the wind powder temperature of coal mill outlet pipeline;Control unit is used to receive the signal of temperature sensor group, flow sensor, coal dust concentration sensor, calculate temperature regulating amount and output signal to temperature regulating device to the wind powder temperature of coal mill outlet.The present application ensures that the wind powder temperature of coal mill outlet is stable near the target value, improves the combustion efficiency, and ensures the stable operation of the entire thermal system.

The invention relates to the technical field of materials, in particular to a preparation method of a heat-resistant alloy thin plate for high-temperature molten salt energy storage. According to the specific technical scheme, the preparation method of the heat-resistant alloy thin plate for high-temperature molten salt energy storage comprises the steps that heat-resistant alloy and aluminum are smelted, hot rolling cogging at the temperature of 1200 DEG C is conducted after smelting, rolling with the deformation being 60% is conducted, and a hot-rolled plate is obtained; and the hot-rolled plate is subjected to solution treatment, water quenching, grinding and rolling, and then the high-aluminum heat-resisting alloy plate is obtained. Compared with nickel-based alloy, the novel alloy thin plate provided by the invention is low in price, excellent in mechanical property and outstanding in corrosion resistance.

The application belongs to the technical field of metal surface treatment, and particularly relates to an alkaline cleaning solution, a preparation method thereof, a formula optimization method and an alkaline cleaning method. Embodiments of the application abandon the formula system of high alkalinity and high phosphate in the prior art, and adopt a moderate alkalinity saponification degreasing-sodium gluconate chelation corrosion inhibition-trace amount of trisodium phosphate auxiliary-degreasing agent solubilization as a synergistic design idea to construct an alkaline cleaning solution formula which is suitable for the component characteristics of iron-chromium-aluminum alloy wire and the quality requirements of blue finished products. The formula enhances the wetting penetration and emulsification dispersion capacity by adding 4% to 10% of sodium hydroxide, 0.5% to 2.0% of sodium gluconate, 0.1% to 2% of trisodium phosphate and 0.1% to 2.0% of degreasing agent. The four components form a complete degreasing-corrosion inhibition synergistic system in the solvent system of water, and the dilemma of black spots due to incomplete degreasing and aluminum deficiency due to excessive degreasing in the alkaline cleaning process of iron-chromium-aluminum alloy wire blue finished products is solved.

The invention relates to the technical field of wharf construction, in particular to a high-pile wharf formwork supporting system and system and a construction method. The supporting system comprises a pile body and a supporting assembly. At least one side of the pile body is provided with an inner concave hole, a fishtail bolt is arranged in the inner concave hole, the tail portion of the fishtail bolt penetrates through the bottom of the inner concave hole and extends into the pile body, a connecting nut is arranged in the inner concave hole, the connecting nut is in threaded connection with at least part of the fishtail bolt left in the inner concave hole, the connecting nut is further in threaded connection with an outward extending structure, and the outward extending structure protrudes out of the pile body. And the connecting assembly is connected with the supporting assembly. According to the high-pile wharf formwork supporting system provided by the invention, the connecting nut and the extending structure can be taken out in a screwing mode under the condition that a pile body is less damaged; the fishtail bolt can be conveniently embedded in the pile body at low cost, so that connection between the fishtail bolt and the outside is cut off, the probability of formation of a corrosion channel connecting the inside and the outside of the pile body is reduced, and the service life of the pile body and the long-pile wharf is prolonged.

This invention provides a method and apparatus for molten salt electrolysis to produce iron based on vacuum environment control, relating to the technical fields of metallurgy and electrochemistry. The method includes the following steps: S1, constructing an electrolysis system: iron-containing raw materials and flux are added to an electrolytic cell and heated to form a molten electrolyte; S2, vacuum environment control: the electrolysis reaction area is placed in a sealed vacuum environment, and the vacuum degree is adjusted to maintain the oxygen partial pressure in the anode area within a preset range; the preset range refers to the pressure range that enables the formation of a dense and constant-thickness passivation oxide film on the surface of the metal anode, while inhibiting the peeling off of the oxide film; S3, electrolytic reduction: while maintaining the vacuum environment after S2 control, a direct current or pulsed current is applied for electrolysis, the cathode is reduced to produce liquid iron, and oxygen is released at the anode; S4, product separation: the oxygen released at the anode in S3 is rapidly extracted using the vacuum pressure difference, and the liquid iron generated by the cathode reduction in S3 and the slag generated during the electrolytic reduction process are periodically discharged.

The present invention relates to an annealing and pickling method for a stainless steel strip after the surface is overburned, and belongs to the technical field of annealing and pickling methods for stainless steel. The present invention adopts a composite organic acid of citric acid and acetic acid as a pickling solution to remove the oxide layer on the metal surface. The tartaric acid, vitamin C, citric acid and acetic acid in the pickling solution are all biodegradable organic acids. This combination provides an environmentally friendly cleaning solution and reduces the impact on the environment. Because organic acids are mainly used as pickling solutions in the present invention, the pickling time will be slightly longer to ensure the pickling effect, but in order to avoid stainless steel corrosion, a corrosion inhibitor is added during the pickling process. Therefore, the annealing and pickling method of the present invention can effectively remove the oxide layer during the annealing and pickling process while avoiding stainless steel corrosion.

The utility model discloses a multi-section variable diameter methanol removal distillation tower, and particularly relates to the technical field of methanol distillation towers, the multi-section variable diameter methanol removal distillation tower comprises a supporting assembly, a distillation assembly is fixedly connected to an inner cavity of the supporting assembly, a cooling assembly is fixedly connected to the upper part of the distillation assembly, and a separation assembly is fixedly connected to the left part of the cooling assembly. The lower portion of the separation assembly is fixedly connected with a slag prevention assembly, and the right portion of the supporting assembly is fixedly connected with a heating assembly. According to the multi-section variable-diameter methanol removal distillation tower disclosed by the utility model, the separation of methanol liquid and gas can be realized through the designed separation assembly, the cooled waste gas possibly still contains uncondensed methanol steam or tiny liquid drops, and the uncondensed methanol steam or tiny liquid drops are blown back into the distillation tower through the fan, so that the uncondensed methanol steam or tiny liquid drops can participate in the gas-liquid mass transfer process again and are further separated and recycled; meanwhile, heat carried in the waste gas returns to the tower along with the gas flow, and the heat can partially replace the heating load of the reboiler.

The invention discloses a method for testing the electrochemical corrosion performance of a coarse and fine WC-enhanced 316L deposition sample, and relates to the technical field of laser melting deposition, and the method comprises the following steps: S1, uniformly mixing 316L powder and WC powder to obtain a coarse and fine WC / 316L composite material; s2, using laser melting deposition equipment to prepare different types of WC / 316L composite materials with different thicknesses into deposition samples with the same size; s3, the deposition samples are subjected to cutting sample preparation through a wire cut electric discharge machine; s4, testing the electrochemical corrosion performance of the deposition samples by using an electrochemical workstation; and S5, under an external voltage condition, measuring a dynamic potential polarization curve and an EIS curve of the deposition samples in a NaCl solution environment. The test conclusion obtained by the test method provided by the invention is as follows: the corrosion trend of fine WC / 316L is minimum, the corrosion rate is minimum, the inhibition effect on current is strongest, and the fine WC / 316L shows the best corrosion resistance.

This invention provides a medium-oxygen weathering steel and its preparation method, belonging to the field of weathering steel production technology. The chemical composition of the medium-oxygen weathering steel includes: C, Si, Mn, P, S, Cr, Cu, Ni, O, and Fe; by mass fraction, the content of C is 0.08%–0.10%, the content of Si is 0.30%–0.50%, the content of Mn is 0.50%–0.65%, the content of P is 0.08%–0.10%, the content of S is ≤0.005%, the content of Cr is 0.40%–0.55%, the content of Cu is 0.30%–0.45%, the content of Ni is 0.10%–0.40%, and the content of O is 0.005%–0.012%. The oxygen content is increased from below 0.003% in ordinary weathering steel to the range of 0.005-0.012%, resulting in silicate inclusions that are more stable and less prone to corrosion. Furthermore, some silicon-manganese-aluminum oxides form composite inclusions with MnS, causing the MnS inclusions to change from long strips to short strips, thus inhibiting corrosion propagation. As a result, the corrosion rate of medium-oxygen weathering steel is reduced by more than 18%, making it suitable for more severe corrosive environments and solving the problem of poor corrosion resistance of ordinary weathering steel in current technologies.

This invention discloses an ultra-fine circuit stripping solution and its preparation method, belonging to the field of printed circuit boards. The ultra-fine circuit stripping solution is characterized by comprising a composite alkali, a corrosion inhibitor, an additive, a surfactant, and a solvent. This invention also provides its preparation method. Compared with existing technologies, the ultra-fine circuit stripping solution prepared by this invention achieves rapid, complete, and selective stripping of high-density fine circuit films by virtue of the efficient bond-breaking ability provided by the composite alkali, the synergistic metal protection of the corrosion inhibitor, the penetration and stripping assistance provided by the surfactant and additive, and the safety and environmental advantages brought by the green solvent system.

The invention discloses a high-strength 6xxx series fine grain aluminum alloy for 3C products and a manufacturing method of the high-strength 6xxx series fine grain aluminum alloy. The high-strength 6xxx series fine grain aluminum alloy comprises, by weight, 0.7%-1.2% of Si, smaller than or equal to 0.20% of Fe, 0.7%-1.2% of Cu, 0.4%-0.8% of Mn, 0.8%-1.1% of Mg, smaller than or equal to 0.1% of Cr, smaller than or equal to 0.25% of Zn, smaller than or equal to 0.1% of Ti, 0.03%-0.09% of Sc, 4.65%-6.65% of aluminum-titanium-carbon intermediate alloy and the balance aluminum. By adding the aluminum-titanium-carbon intermediate alloy, the refining capacity and aging are efficiently improved; the melt purification of the aluminum alloy is facilitated, and the metallurgical quality of an aluminum alloy product is improved; the aluminum alloy cast ingot can obtain grains with uniform and consistent sizes from the surface to the center, and the final use performance of the product is improved; the intergranular corrosion rate can be reduced, and the corrosion resistance of an aluminum alloy product is improved; refining poisoning can be effectively overcome, and the casting quality of the high-strength and heat-resistant aluminum alloy is improved. The manufactured high-strength 6xxx series fine grain aluminum alloy has the following advantages that the alloy performance is that the yield strength is larger than or equal to 430 MPa, the tensile strength is larger than or equal to 450 MPa, and the ductility is larger than or equal to 10%; the average grain size is smaller than or equal to 150 microns, and the maximum grain size is smaller than or equal to 300 microns.

This utility model discloses a dust collection device for busbar cutting, comprising: a support member, a magnetic suction member, and a collection assembly; the support member has a through hole, and the support member is sleeved on the busbar through the through hole; the support member has an annular groove surrounding the busbar and opening towards the end of the busbar; the magnetic suction member is installed on the support member located on the back of the annular groove, magnetically attracting dust into the annular groove; the collection assembly is installed below the support member and communicates with the annular groove. This reduces the splashing of iron filings and dust, improves safety, and provides a certain degree of protection for the surrounding environment and personnel. It also reduces the penetration of iron filings and dust deep into the busbar, lowers the difficulty of cleaning, and reduces labor intensity. Furthermore, it prevents splashed iron filings from damaging the busbar, maintaining a good appearance for the busbar, reducing the rate of corrosion caused by impurities, and extending its service life.

The invention relates to the technical field of coating materials, in particular to a preparation method of sealing coating powder and a preparation method of a sealing coating. The preparation method of the seal coating powder comprises the following steps: ball-milling and mixing diffusion phase powder and lubricating phase powder to obtain mixed powder; the diffusion phase powder is one or more of aluminum alloy, titanium alloy and nickel alloy, and the lubricating phase powder is polybenzoate, molybdenum disulfide, hexagonal boron nitride or bentonite; the mixed powder and structural phase powder are subjected to ball-milling mixing to obtain composite powder, so that an intermetallic compound layer is formed on the interface of the structural phase and the diffusion phase, and part of the structural phase wraps the periphery of the mixed powder; the structural phase powder is copper alloy; and the composite powder is subjected to high-temperature treatment, the powder subjected to high-temperature treatment is screened, and powder in a preset particle size range is selected as sealing coating powder. The problems that a sealing coating is poor in corrosion resistance and low in abradability can be solved.