214 results about "Anodizing" patented technology

The invention discloses a rare earth element doped stainless steel oxygen evolution electrode and a preparation method thereof, and belongs to the technical field of electrode preparation. The preparation method of the stainless steel oxygen evolution electrode comprises the steps that stainless steel with impurities removed serves as an anode and is placed in an alkaline solution with the concentration being 7-12 mol / L, cyclic voltammetry is adopted, stainless steel treated through cyclic voltammetry is obtained, and the potential window is-0.3 V to 1.5 V; the stainless steel is placed in an alkaline solution with the concentration being 1-2 mol / L and serves as an anode for electrolysis, and anodic oxidation stainless steel is obtained; the anodic oxidation stainless steel is placed in a cerium ion solution, a cyclic voltammetry method is adopted, the stainless steel serves as an anode to be treated, and a stainless steel oxygen evolution electrode is obtained through electro-deposition; wherein the potential window is-1.5 V to 1.0 V (+ / -0.5 V). The preparation method is simple, the cost is low, large-scale preparation is easy, long-time, high-temperature and other complex preparation processes are not needed, and when the electrode is used as an electrode for electrolyzing oxygen evolution in water, the electrode has excellent catalytic activity and shows huge application prospects in large-scale industrial hydrogen production through water electrolysis.

The invention discloses an aluminum alloy profile surface highlight corrosion-resistant treatment process which comprises the following steps: S1, pretreatment including degreasing and alkaline etching; s2, anodic oxidation; s3, chemical brightening treatment; s4, surface wiredrawing; s5, carrying out sand blasting; s6, highlight is conducted; s7, treating with a silane coupling agent; s8, carrying out secondary oxidation treatment; s9, performing nano-composite hole sealing; s10, spraying, printing and chemical brightening are used for replacing traditional mechanical polishing, so that the surface of the aluminum alloy profile is smoother, the uniformity of glossiness is improved, scratches possibly generated by mechanical polishing are avoided, stable chemical bonds are formed between the profile and a hole sealing layer through coupling agent treatment, the surface state is optimized, it can be ensured that a hole sealing agent can be attached more firmly, and the service life of the aluminum alloy profile is prolonged. According to the secondary oxidation treatment, an oxidation film is thickened after highlight treatment, the formed highlight surface is not affected, invasion of a corrosion medium is effectively blocked, nano-scale pores in the oxidation film are filled with nano silicon dioxide, a compact hole sealing layer is formed, and therefore the corrosion resistance of the workpiece is improved.

The invention discloses an aluminum alloy hard oxidation process, and relates to the technical field of aluminum alloy part surface treatment, the aluminum alloy hard oxidation process comprises the following steps: S1, pretreatment: oil removal, alkali corrosion treatment and acid pickling neutralization; s2, hard oxidation is conducted, specifically, the pretreated workpiece is put into an oxidation tank with electrolyte and a stirring system to be subjected to stirring and oxidation treatment; and S3, post-treatment: cleaning with hot water, sealing with nickel acetate and drying in a drying oven. The process mainly comprises the following steps: carrying out pretreatment of oil removal by an organic solvent, alkali etching and acid pickling, combining sulfuric acid-citric acid-monopotassium phosphate composite electrolyte, pulsed power supply and gradient boosting oxidation, carrying out ultrasonic stirring and precise temperature control hard oxidation, and finally carrying out nickel acetate sealing aftertreatment. The four industrial problems of poor batch consistency of oxidation films of aluminum alloy workpieces, non-uniformity of complex workpieces, high energy consumption and poor compatibility to high alloy materials are thoroughly solved, and the oxidation film which is high in hardness, uniformity and corrosion resistance and saves energy is obtained.

The invention discloses 7000 series aluminum alloy and a preparation method and application thereof, and relates to the technical field of aluminum alloy. The aluminum alloy comprises Al and the following components in percentage by mass: 6%-7% of Zn; 2.5%-4% of Mg; cu: 0.2%-0.7%; 0.05% to 0.2% of Mn; less than or equal to 0.05% of Cr; ti < = 0.1%; zr < = 0.1%; less than or equal to 0.15% of Si; fe is less than or equal to 0.15%. The aluminum alloy has high strength, high corrosion resistance and excellent anodic oxidation performance, and is suitable for the field of 3C electronic products or automobiles. The invention further provides a preparation method and application of the aluminum alloy.

The invention relates to the technical field of power electronic components, and discloses a fast charge-discharge aluminum electrolytic capacitor and a preparation method thereof. The fast charge and discharge aluminum electrolytic capacitor comprises a high-purity aluminum foil subjected to aluminum chloride-hydrochloric acid etching and oxalic acid-tartaric acid oxidation treatment, a porous electrolyte layer with the thickness of 0.015-0.020 mm, a composite organic-inorganic electrolyte and an aluminum shell packaging structure, the preparation method comprises the steps of aluminum foil processing, electrolyte cutting, winding and assembling, vacuum infusion under-0.09 to-0.095 MPa, staged aging charging under the condition of 70-90 DEG C, and finally packaging and forming. According to the method, a compact oxidation film is formed through anodic oxidation, the proportion of gamma-butyrolactone in the electrolyte is optimized, the staged voltage aging and vacuum infusion process is implemented, and the fast charging performance, high-temperature stability and overall reliability of the aluminum electrolytic capacitor are synergistically improved from the material level and the process level.

The invention provides an aluminum or aluminum alloy anodic oxidation method and a metal workpiece. The anodic oxidation method comprises the steps that a metal matrix of aluminum or aluminum alloy is subjected to first-section anodic oxidation, a first layer of anodic oxidation film is formed on the surface of the metal matrix, the voltage of the first-section anodic oxidation ranges from 19 V to 27 V, the stable current density of the first-section anodic oxidation is I1, the peak current density of the first-section anodic oxidation is I2, and I2 is larger than 1.5 I1 and smaller than 2I1; and the metal matrix is subjected to second-section anodic oxidation, a second layer of anodic oxidation film is formed on the surface of the metal matrix, the second layer of anodic oxidation film is located between the metal matrix and the first layer of anodic oxidation film, and the voltage of the second-section anodic oxidation is 15-18 V. According to the method, sectional anodic oxidation is utilized, the internal stress and thermal stress of the anodic oxide film are reduced, the anodic oxide film low in cracking risk and high in density is formed, and the method can be suitable for base materials of complex structures.

The invention discloses a preparation process of an oxidation film on the inner wall of a precise aluminum pipe, which comprises the following steps: step 1, oxidizing the aluminum pipe by adopting a semi-hard anodic oxidation electrolyte and a pulse current with the density of 1.5-2A / dm < 2 > in a bath solution temperature environment of 15-20 DEG C, the semi-hard anodic oxidation electrolyte comprises sulfuric acid with the concentration of 12%-15%, oxalic acid with the concentration of 2%-3% and glycolic acid with the concentration of 0.5%-1%. Step 2, carrying out hole sealing treatment on the oxide film on the inner wall of the aluminum pipe by using a nickel salt-containing medium-temperature hole sealing agent; 3, the aluminum pipe is soaked in methyl phenyl silicone resin, and meanwhile the permeability of the methyl phenyl silicone resin is improved through ultrasonic-assisted permeation; and 4, the aluminum pipe is baked, so that the methyl phenyl silicone resin permeates into the oxidation film on the inner wall of the aluminum pipe to form the composite coating. By adopting semi-hard anodic oxidation, the requirement of 3000 times of friction wear resistance of the selfie telescopic rod can be met, the cost is obviously lower than that of hard anodic oxidation, and mass production is facilitated.

According to the anodic oxidation technology suitable for the 6061 aluminum alloy, multi-component silica sol is adopted for conducting room-temperature dipping hole sealing and low-temperature curing on a 6061 aluminum alloy anodic oxidation film, and technology energy consumption and equipment requirements are reduced. The dense silicon network seals the membrane holes, prolongs the diffusion path of a corrosive medium and prevents the corrosive medium from invading the substrate, thereby greatly improving the corrosion resistance of the membrane layer and inhibiting pitting corrosion.

The utility model relates to the technical field of clamps, in particular to an aluminum alloy hard anodizing spring clamp which comprises a support, a hook and a clamping piece, the support is of a triangular structure and comprises a vertical rod and a transverse rod, the vertical rod is perpendicular to the transverse rod, and inclined rods are symmetrically arranged between the vertical rod and the transverse rod. The hooks are welded to the ends, away from the transverse rod, of the vertical rods and used for hanging the clamp and connecting current, the clamping pieces are welded to the two sides of the transverse rod, cylindrical rods are arranged at the two ends of each clamping piece and used for clamping aluminum alloy parts, the clamping pieces are manufactured through punching and bending, have elasticity and can guarantee stable clamping, and the multiple clamping pieces can clamp a plurality of parts at the same time for oxidation treatment. Six clamping pieces are arranged in the attached drawing, and six parts can be clamped at the same time. When the clamping piece is used, the cylindrical rods at the two ends of the clamping piece extend into holes in an aluminum alloy part, clamping marks cannot be left on the surface of the part while clamping is stable, the conductivity is good, stable current can be connected to the part, and the part can be effectively prevented from being damaged.

The invention provides an anodic oxidation solution. The anodic oxidation solution comprises the following components of 5 g / L to 20 g / L of citric acid, 20 g / L to 50 g / L of oxalic acid, 4 g / L to 7 g / L of inorganic cerium salt, 5 g / L to 9 g / L of triethanolamine, 1 g / L to 3 g / L of aluminum isopropoxide and 5 g / L to 7 g / L of 3-methyl-2-pentene-4-alkyne-1-alcohol. The invention further provides an anodic oxidation method suitable for the aluminum material, according to the anodic oxidation method, the anodic oxidation liquid is adopted for oxidation, the oxidation temperature is 8-12 DEG C, the oxidation current density is 1-5 A / dm < 2 >, the oxidation voltage is 30-50 V, and the oxidation time is 20-30 min. The anodic oxidation liquid is matched with oxidation parameters, so that the film forming speed of an oxidation film is increased, and the voltage resistance of a product is improved.

The invention relates to a precise welding method for dense welding seams of a complex structure, and relates to the technical field of heat exchange equipment manufacturing. The process comprises the steps of welding of the interior of a core body, surface treatment of a brazing seam and welding of an end socket. The inner part of the core body adopts BNi-2 brazing filler metal to perform vacuum brazing welding on the assembled core body, the surface treatment of the welding seam is that local anodic oxidation treatment is performed on a brazing seam area after welding, a NiO protective layer is selectively generated, and the welding of the end socket is that silver-copper-titanium active brazing filler metal is pre-arranged in a connecting area of the core body and the end socket. And the lower melting point can prevent a brazing seam in the core body from melting. By selecting brazing filler metal components, welding parameters and a post-treatment process, the problems that in traditional brazing, interface brittle phases, pore defects, weld joints are prone to corrosion and the like are solved, the sealing performance of joints is remarkably improved, and the method is suitable for manufacturing of high-performance heat exchangers in the fields of aviation, chemical engineering and the like.

The utility model provides an aluminum sheet surface phosphoric acid anodizing treatment device for a single-lap tensile shear test of an adhesive film, which comprises a reaction tank filled with phosphoric acid electrolyte; the aluminum sheet is arranged at one end in the reaction tank in a hanging manner and is connected with the positive electrode of the power supply; the lead plate is arranged at the other end in the reaction tank in a hanging manner and is connected with the negative electrode of the power supply; the heater is arranged in the reaction tank and is used for heating the phosphoric acid electrolyte; the areas of the lead plate and the aluminum sheet immersed in the phosphoric acid electrolyte are set as S1 and S2 respectively; the range of S1 to S2 is 1: 1-1: 10. By designing the special aluminum sheet surface phosphoric acid anodizing treatment device, instant and small-batch phosphoric acid anodizing treatment on aluminum sheets in a laboratory environment is realized, and the problem that the existing industrial batch production mode is difficult to meet small-scale and high-frequency flexible requirements is solved; and the rapid verification requirement on a small amount and multiple batches of samples in the adhesive film research and development stage is met.

The utility model relates to the technical field of aluminum alloy processing, in particular to an oxidation device for aluminum alloy anodizing. The oxidation device for aluminum alloy anodizing comprises an anodizing box, a supporting frame is arranged at the top of the anodizing box, an electric telescopic rod is arranged at the top of the supporting frame, the telescopic end of the electric telescopic rod penetrates through the bottom of the supporting frame and is connected with a box cover, and the box cover is located at the top of the anodizing box. A threaded hole is formed in the bottom of the box cover, a second anti-skid gasket is arranged at the bottom of the box cover, the second anti-skid gasket is located on the outer ring of the threaded hole, and mounting holes are evenly formed in the inner side wall of the threaded hole; the connecting ring can be conveniently controlled to rotate through the vertical groove so as to drive the screw rod to rotate, after the screw rod is spirally separated from the threaded hole in the bottom of the box cover, the fixing rope can be taken down from the lower portion of the box cover, and therefore the effect that the fixing rope is rapidly disassembled and assembled by a single person is achieved.

The application discloses a continuous anodic oxidation production line for curtain wall and a preparation method thereof, wherein the production line is provided with a feeding mechanism, a grinding plate mechanism, a first pressure water washing mechanism, an alkali immersion mechanism, a second pressure water washing mechanism, an oxidation mechanism, a first detection mechanism, a third pressure water washing mechanism, an electrolytic coloring mechanism, a fourth pressure water washing mechanism, a hole sealing machine, a second detection mechanism, a film coating machine and a discharging mechanism; after unwinding the plate material, the plate material is input through the feeding mechanism and then sequentially passes through the above mechanisms to perform first pressure water washing, alkali washing, second pressure water washing, oxidation, first detection, third pressure water washing, electrolytic coloring, fourth pressure water washing, hole sealing, second detection and film coating on the plate material, so as to obtain the curtain wall; and after obtaining the curtain wall, the curtain wall is output through the discharging mechanism, continuous production of the curtain wall is realized, and the curtain wall does not need to be stopped for transfer and plate material carrying; the overall degree of automation is high, and the processing efficiency is high.

The invention relates to an anodizing method suitable for a titanium alloy cylindrical part, belongs to the technical field of metal surface treatment, and solves at least one of the problems that an oxidation film formed by anodizing the titanium alloy cylindrical part is insufficient in density and hardness, is locally loosened and is easy to fall off and the like in the prior art. According to the anodizing method suitable for the titanium alloy cylindrical part, in the anodizing process, the titanium alloy cylindrical part continuously rotates in one direction along the axis in an anodizing solution, and the rotating linear speed and voltage are increased in a stepped mode. A surface oxidation film of the titanium alloy cylindrical part prepared through the method is high in compactness, the porosity is smaller than or equal to 24%, the hardness is high and ranges from 250 HV to 300 HV, the problem of local loosening and falling is almost avoided, the titanium alloy part has better wear resistance and anti-corrosion effect, according to testing of GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, after 500 hours of neutral salt spray test, the corrosion resistance of the titanium alloy cylindrical part is improved, and the corrosion resistance of the titanium alloy cylindrical part is improved. And the surface of the film layer has no corrosion sign.

The present invention discloses a long-lasting intelligent composite antibacterial coating with dual pH response function and its preparation method, including: 1) constructing a nanotube structure on the surface of a pretreated titanium alloy substrate by a surface anodizing process; 2) combining a cyclic vacuum infusion + low-temperature micro-airflow process, infusing a povidone-iodine mixed solution into the nanotube pores on the titanium alloy surface; 3) after the titanium alloy surface is washed with water, a surface silanization treatment is performed to introduce a silane preparation with a double bond; 4) combining a surface cyclic light curing process, NAC-ChiMA is introduced into the substrate surface by a double bond addition reaction between the silane preparation and chitosan (NAC-ChiMA) modified with MA and NAC, to achieve the preparation of a composite antibacterial coating. The composite coating realizes the sequential release and slow release of NAC and povidone-iodine through the characteristics of vacuum drug loading and dual pH response, first destroying the extracellular polymeric substances of the bacterial biofilm, and then killing the bacteria in the biofilm, thereby achieving effective treatment of orthopedic implant infection.

The invention provides a surface treatment process which is used for carrying out surface treatment on a workpiece with a sand blasting surface and a highlight surface, and the surface treatment process comprises the following steps: carrying out anodic oxidation treatment on the sand blasting surface; carrying out highlight wire drawing treatment on the highlight surface through the passivated cutter, and carrying out anodic film removal treatment on the sand blasting surface subjected to anodic oxidation treatment so as to clean a residual oxidation layer; performing anode dyeing treatment on the sand blasting surface subjected to anode film removal treatment and the highlight surface subjected to highlight wiredrawing treatment so as to obtain the highlight surface and the sand blasting surface which are consistent in color; the sandblasting surface is firstly subjected to anodic oxidation, then the anodic film is removed, and finally the sandblasting surface and the highlight surface are subjected to anodic dyeing together, so that the sandblasting surface and the highlight surface can achieve the effect of consistent color after final dyeing, meanwhile, the highlight surface is subjected to highlight wiredrawing treatment by adopting a passivated cutter, the glossiness of the highlight surface is improved, and the service life of the highlight surface is prolonged. The highlight effect of the highlight surface is guaranteed on the basis that the gravel texture of the sand blasting surface is guaranteed.

The utility model discloses a device for aluminum alloy anodic oxidation dyeing, which comprises an electrolytic dyeing tank, two supports are fixedly connected to both sides of the electrolytic dyeing tank, the upper ends of the four supports are fixedly connected with the same bearing plate, the upper surface of the bearing plate is fixedly connected with two support plates, and the support plates are fixedly connected with the upper surface of the bearing plate. The upper surfaces of the two supporting plates are fixedly connected with first motors, and the output ends of the two first motors are fixedly connected with first belt wheels. Through an air blower and an air outlet, after the air blower is started, the air blower generates wind power, the wind power is sprayed out through the air outlet, parts on the hook can be quickly blow-dried, the volatilization speed of electrolyte is increased, and the working efficiency is improved; and air blown out of the air outlet can blow-dry the parts more comprehensively, and the part drying efficiency is improved.

A method of anodizing an aluminum alloy, comprising the steps of: providing an anodizing bath containing tert-butoxide, primarily oxalic acid; aging the anodic oxidation bath to condense the metal alkoxide to form metal oxide particles and an acid ester; heating the bath to 40 DEG C to 80 DEG C; stirring the bath at a speed of 200 to 700 rpm (revolutions per minute); immersing the workpiece in a bath and anodizing at a constant current density of 1 A / dm2 to 4 A / dm2 for 1 to 20 minutes or until the bath voltage reaches a threshold value of 100 to 200 V; the workpiece is then anodized at a constant voltage for 20 minutes to 200 minutes to produce an anodized surface having a thickness of 5 microns to 100 microns, the anodized surface comprising an optically discontinuous pore structure that produces a white or near-white appearance.

The invention relates to the technical field of metal polishing, and discloses a metal surface polishing device and a polishing method for metal anodic oxidation processing.The metal surface polishing device comprises a polishing workbench, a plate conveying belt is mounted at the top of the polishing workbench, and a lifting mounting base is mounted outside the polishing workbench; a driving mechanism is mounted outside the lifting mounting base, and a polishing mechanism is mounted outside the driving mechanism. When the polishing mechanism moves to the position closest to the connecting screw rod, a transmission gear starts to be connected with the interior of the polishing mechanism in a clamped mode, and the transmission gear is connected with the interior of the polishing mechanism in a clamped mode so that a transmission sleeve can rotate to drive the polishing mechanism to rotate reversely through the transmission gear; and in this way, the rotating transmission rod circularly drives the polishing mechanism to rotate in the forward direction and the reverse direction, multi-angle polishing operation is conducted on the metal plate through the forward rotation and the reverse rotation of the polishing mechanism, and therefore machining dead angles can be effectively prevented from occurring in the polishing process of the metal plate.

1. Name of the product in this design: Clamp (Three-head clamp). 2. Application of this design: It is used as a clamp to hold aluminum profiles during electroplating, electrophoresis, anodizing, polishing and other processes. 3. The key design features of this product are the shapes shown in the left view of Design 1 and the left view of Design 2. 4. The image or photograph that best illustrates the key design points: Left view of Design 1. 5. Design 1 is designated as the basic design.

The present invention discloses a method for processing a corrosion-resistant blade adjustment ring. Two half-ring blanks arranged in half are obtained by machining, and after the two half-ring blanks are paired to process multiple end holes, a suitable first positioning bushing is selected by calculation, so that the first positioning bushing with clearance fit can effectively avoid dimensional deviation when the first ring body is decomposed, ensuring that the subsequent second positioning bushing with interference fit can still meet the technical requirements. After the mounting hole is machined, sulfuric acid anodizing treatment can be performed to effectively ensure the integrity of the anodized protective film on the surface of the blade adjustment ring, improve the corrosion resistance of the blade adjustment ring, and prevent the occurrence of corrosion to the greatest extent, so that the turboshaft engine using the blade adjustment ring of this scheme has high reliability and long service life. At the same time, the machining process after sulfuric acid anodizing treatment is reduced, and the risk of damaging the anodized protective film during subsequent machining is reduced. The method has strong practicality and is suitable for wide promotion and application.

The utility model relates to the technical field of degreasing devices, and discloses a degreasing device for aluminum alloy anodic oxidation, which is characterized in that the inner walls of two fixed seats are rotatably connected with a rotating rod, one end of the rotating rod is provided with a motor, the motor is positioned on the inner wall of one fixed seat, and the outer wall of the rotating rod is clamped with two sleeve plates; a first clamping rod and a second clamping rod are welded to the faces, close to each other, of the two sleeve plates, an air cylinder is arranged on the outer wall of the fixing plate, a second clamping rod is arranged on a rod body of the air cylinder, and the first clamping rod and the second clamping rod are located on the parallel line. Through the arrangement of the air cylinder and the clamping rods, the motor drives the rotating rod to rotate, the rotating rod drives the sleeve plate to rotate to the conveying belt, the first clamping rod is located on one side of a workpiece, the air cylinder drives the second clamping rod to be pushed towards the first clamping rod, the second clamping rod and the first clamping rod are matched to clamp and fix a row of workpieces, and the motor drives the rotating rod to rotate. The sleeve plate drives the first clamping rod and the second clamping rod to rotate, the first clamping rod and the second clamping rod drive the workpiece to rotate to the cleaning assembly to be cleaned, and the flexibility of the device is improved.

The invention relates to a method for sealing a nickel-free zirconium salt oxide film on an aluminum alloy profile, which mainly solves the problem of poor sealing effect in the prior art. The method comprises the following steps: 1) suspending the aluminum profile in sequence through a suspension assembly and subjecting it to surface pretreatments of sandblasting, oil removal, water washing, alkali washing, water washing, pickling, and water washing; 2) suspending the aluminum profile in an electrolytic tank through the suspension assembly and performing anodizing; 3) air-drying the aluminum profile treated in step 2; 4) suspending the aluminum profile in a sealing tank through the suspension assembly, using an aluminum electrode as an anode and the aluminum profile to be sealed as a cathode and performing pulse power treatment for 25 minutes, while the aluminum profile vibrates and a sealing liquid is circulated and sprayed through a jet steam engine, so that the sealing tank is in an aerated state and the electrolyte temperature is maintained at 70 to 110 degrees Celsius; and 5) cleaning and drying the aluminum profile treated in step 4.

The invention discloses a manufacturing method of a heteromorphic aluminum piston. The manufacturing method comprises the following operation steps: S1, casting a piston head made of an aluminum alloy material, and synchronously embedding a wear-resistant insert ring and a salt core; s2, forging a piston skirt part made of an aluminum alloy material; s3, the piston head and the piston skirt are welded into a whole through the friction welding technology; and S4, welding flashes are removed, final finish machining is conducted on the combined piston blank, anodic oxidation or other surface treatment is conducted, and the finished composite integrated piston is obtained. The invention further provides the aluminum piston prepared through the manufacturing method of the abnormal-state aluminum piston. According to the manufacturing method of the special-state aluminum piston, metallurgical bonding of the casting head and the forging skirt is achieved through the friction welding solid connection technology, the problems of fusion welding cracks and air hole defects are fundamentally avoided, meanwhile, the requirements for abrasion resistance and heat resistance of the head and toughness of the skirt are considered, lightweight design is conducted, the manufacturing period is shortened, and the percent of pass is increased.

The utility model relates to the technical field of lithium batteries, and discloses a new energy lithium battery high-voltage-resistant end cover which comprises an end cover, and the end cover comprises an aluminum substrate, and an inner insulating layer and an outer insulating layer which are arranged on the inner surface and the outer surface of the aluminum substrate; the aluminum substrate is subjected to anodic oxidation, and then the surface is subjected to injection molding or plastic dipping to obtain an inner insulating layer and an outer insulating layer. The inner insulating layer and the outer insulating layer are made of PE plastic. The PE plastic has good insulation performance and chemical corrosion resistance, the electrical insulation and chemical stability of the end cover are improved, the surface hardness and corrosion resistance of the aluminum substrate are improved through anodic oxidation, and the overall durability of the end cover is improved. And the insulating layer formed by the injection molding or plastic dipping process can effectively improve the insulating property, prevent high-voltage breakdown and ensure the safety of the battery. After the insulating layer is thickened, the voltage endurance capability of the end cover is remarkably improved, and the requirement of a high-voltage battery is met.

In an example embodiment, a method of coloring an alloy is provided. The method includes anodizing a substrate in an anodizing bath comprising phosphoric acid at a constant temperature and a constant voltage for a first period of time to form an anodized layer comprising a barrier layer; reducing the constant voltage applied to the anodizing bath for a second period of time to change a thickness of the barrier layer and change a width of pores in the anodized layer; plating the substrate in a plating bath at a first current that increases over a third period of time according to a current profile of the plating bath; and plating the substrate in the plating bath at a second current for a fourth period of time.

The invention relates to the technical field of anodic oxidation treatment, and discloses an anodic oxidation normal-temperature and high-temperature sealing treatment agent, the sealing treatment agent comprises a normal-temperature treatment agent and a high-temperature treatment agent, each liter of normal-temperature sealing liquid is composed of 1-3 g of nickel fluoride, 5-8 g of potassium sodium tartrate tetrahydrate, 10-15 mL of boehmite sol and 0.05-0.2 g of SrTiO3 / BPQDs heterojunction catalyst; each liter of the high-temperature confining liquid is composed of 3-8 g of lanthanum nitrate, 5-15 g of aluminum citrate, 0.1-1 g of PNIPAM, 0.4 g of PNIPAM and 1-3 g of boric acid. According to the invention, a compact composite film layer can be finally obtained.

This invention discloses an anodizing process and apparatus for the inner wall of a metal container, relating to the field of metal surface treatment technology. The apparatus includes a cathode and a circulation system; the cathode is inserted into the inner cavity of the metal container through an opening; the circulation system includes at least a circulation pump and an inlet pipe, the outlet of which is configured to be positioned at the bottom of the container's inner cavity; wherein the opening of the metal container is configured as an overflow outlet for the electrolyte. This invention, through forced circulation, allows the electrolyte to enter from the bottom and exit from the top of the container, forming a flow pattern of bottom inlet and top overflow. This effectively improves the flow field distribution within the container cavity, promptly removes reaction heat and discharges oxidizing gases, significantly improving the uniformity and density of the anodized film on the inner wall and reducing film defects.

The present invention relates to the field of metal surface preparation by anodizing processes, and to a method for producing a corrosion-resistant aluminum-silicon alloy casting, and more particularly to the optimization of the anodizing of high-silicon aluminum castings by using a multi-stage anodizing cycle. The present invention also relates to a corrosion-resistant aluminum-silicon alloy casting and its use.