Search

CN-120158630-B - Bright corrosion-resistant aluminum profile and preparation method thereof

CN120158630BCN 120158630 BCN120158630 BCN 120158630BCN-120158630-B

Abstract

The invention discloses a preparation method of a bright corrosion-resistant aluminum profile, which relates to the technical field of aluminum profile processing and comprises the following steps of mixing and smelting raw materials, pouring, homogenizing, and forming an ingot; extruding, heat treating to form aluminum profile, surface treating to obtain bright corrosion resisting aluminum profile, and the surface treating includes electrolytic oxidation, electrophoretic painting and sealing. According to the invention, the rare earth element plays roles of purifying the matrix, refining and modifying and micro-alloying in the aluminum alloy, and the aluminum alloy structure is refined, so that better compactness and integrity can be shown after oxidation, the protective performance of the aluminum profile is improved, and the corrosion resistance and the brightness of the aluminum profile are improved. The anode plasma electrolytic oxidation is used for preprocessing the aluminum profile and oxidizing the surface of the aluminum profile, and then the cathode plasma electrolytic deposition is used for avoiding the direct contact between the cathode aluminum profile and electrolyte, closing the pores of the barrier layer, obtaining a more compact oxide layer and improving the brightness and corrosion resistance.

Inventors

  • CHEN JIAN
  • LU JIANHONG
  • ZHOU YUXING
  • SU SONG

Assignees

  • 泰兴市盛泰铝业制造有限公司

Dates

Publication Date
20260512
Application Date
20250226

Claims (6)

  1. 1. A preparation method of a bright corrosion-resistant aluminum profile is characterized by comprising the following steps: Mixing and smelting raw materials, casting, homogenizing to form cast ingots, extruding, heat treating to form aluminum profiles, and surface treating to obtain bright corrosion-resistant aluminum profiles; the surface treatment comprises electrolytic oxidation, electrophoretic painting and hole sealing; The electrolytic oxidation comprises anodic plasma electrolytic oxidation and cathodic plasma electrolytic deposition; the anode plasma electrolytic oxidation is carried out by taking an aluminum profile as an anode and carrying out anode plasma electrolytic oxidation in sodium silicate mixed solution to form a barrier layer; the cathode plasma electrolytic deposition is carried out, the aluminum profile obtained in the step is taken as a cathode, platinum is taken as an anode, and the cathode plasma electrolytic deposition is carried out in electrolyte to form an oxide layer; The technological conditions of the cathode plasma electrolytic deposition are that the voltage is 150-200V, the frequency is 500-600 Hz, the duty ratio is 50-60%, and the oxidation time is 10-30 min; The electrolyte comprises 100-300 g/L aluminum nitrate, 10-50 g/L yttrium nitrate, 10-50 mL/L glycerin and 15-25 g/L polyethylene glycol, wherein the mass ratio of the aluminum nitrate to the yttrium nitrate is (5.2-5.6) 1; The electrophoretic painting process comprises the steps of taking the aluminum profile obtained in the previous step as a cathode, and carrying out electrophoretic painting in an electrophoretic solution to obtain a hole sealing layer, wherein the electrophoretic solution is 100-150 g/L of water-based cationic resin.
  2. 2. The method for producing a bright corrosion resistant aluminum profile according to claim 1, wherein the aluminum profile comprises the following components by mass ,Si:0.2％～0.6％,Mg:0.35％～0.90％,Fe:≤0.05％,Cu:≤0.10％,Mn:≤0.10％,Cr:≤0.10％,Ti:≤0.10％,Zn:≤0.10％,RE:0.1％～0.4％, and the balance of Al.
  3. 3. The method for preparing the bright corrosion resistant aluminum profile according to claim 1, wherein the water-based cationic resin is prepared by the following process: Mixing the emulsifier with the mass of 1/4 of the components and deionized water, stirring at the temperature of 40-45 ℃ and the rotating speed of 650-750 r/min, adding methyl methacrylate, styrene, butyl acrylate, unsaturated epoxy resin, vinyl triisopropoxy silane, dimethylaminoethyl methacrylate and hexafluorobutyl methacrylate, and stirring for 30-40 min to obtain a pre-emulsion; Mixing 1/4 of the initiator and deionized water, adding the rest of the emulsifier and the deionized water, adding 1/4 of the pre-emulsion, heating to 65-75 ℃, adding 1/4 of the initiator, stirring at a rotating speed of 200-300 r/min for reaction for 30-40 min, slowly adding the rest of the pre-emulsion, adding the rest of the initiator every 30min, continuing to perform heat preservation for reaction for 60-75 min after the addition of 4h, and adding diethanolamine for reaction for 100-150 min; cooling to 50-60 ℃, adding glacial acetic acid, stirring and reacting for 150-180 min, and cooling to obtain the water-based cationic resin.
  4. 4. The method for preparing a bright corrosion resistant aluminum profile according to claim 3, wherein the unsaturated epoxy resin is prepared by the following process: Mixing epoxy resin, 4- (4-hydroxyphenyl) phthalazine-1 (2H) -ketone and a catalyst, heating to 65-75 ℃ under the protection of nitrogen atmosphere, and reacting at constant temperature for 5-7H to obtain the naphthyridine epoxy resin; Mixing the naphthyridine epoxy resin, 6-thiooleic acid, a catalyst and a polymerization inhibitor, heating to 60-80 ℃, and carrying out light-shielding reaction for 3-5 hours to obtain the unsaturated epoxy resin.
  5. 5. The method for preparing the bright corrosion-resistant aluminum profile according to claim 3, wherein the water-based cationic resin comprises, by mass, 10-15 parts of methyl methacrylate, 4.5-10 parts of styrene, 9-19 parts of butyl acrylate, 27-36 parts of unsaturated epoxy resin, 5-10 parts of vinyl triisopropoxysilane, 3-7 parts of dimethylaminoethyl methacrylate, 4-12 parts of hexafluorobutyl methacrylate, 0.8-1.2 parts of an initiator, 0.5-1.0 parts of an emulsifier, 10-20 parts of diethanolamine and 3.2-5.7 parts of glacial acetic acid.
  6. 6. A bright corrosion resistant aluminum profile made by the method of any one of claims 1-5.

Description

Bright corrosion-resistant aluminum profile and preparation method thereof Technical Field The invention relates to the technical field of aluminum profile processing, in particular to a bright corrosion-resistant aluminum profile and a preparation method thereof. Background Aluminum and aluminum alloys have many advantages and are widely used in the fields of mechanical manufacturing, building decoration, aerospace, electrician electronics, etc. The surface hardness, wear resistance, corrosion resistance and other performances of the aluminum and aluminum alloy can be improved by adopting electroplating, chemical plating, anodic oxidation, vapor deposition and other modes. Compared with other technologies, the micro-arc oxidation can form an oxide layer on the surfaces of aluminum and aluminum alloy, and the growth rate of the oxide layer is higher, the binding force with an aluminum alloy matrix is stronger, and the aluminum alloy has better wear resistance and corrosion resistance. And micro-arc oxidation is an anode reaction, anodic dissolution and passivation film generation can occur, so that the surface of an oxide layer is porous, and the corrosion resistance and the surface brightness of the aluminum profile are affected. Therefore, we propose a bright corrosion-resistant aluminum profile and a preparation method thereof. Disclosure of Invention The invention aims to provide a bright corrosion-resistant aluminum profile and a preparation method thereof, so as to solve the problems in the background technology. In order to solve the technical problems, the invention provides the following technical scheme that the preparation method of the bright corrosion-resistant aluminum profile comprises the following steps: mixing and smelting raw materials, casting, homogenizing, and forming an ingot; extruding, heat treating to form aluminum profile; and (3) carrying out surface treatment to obtain the bright corrosion-resistant aluminum profile. Further, the aluminum profile comprises, by mass, 0.2% -0.6% of Si (silicon), 0.35% -0.90% of Mg (magnesium), less than or equal to 0.05% of Fe (iron), less than or equal to 0.10% of Cu (copper), less than or equal to 0.10% of Mn (manganese), less than or equal to 0.10% of Cr (chromium), less than or equal to 0.10% of Ti (titanium), less than or equal to 0.10% of Zn (zinc), 0.1% -0.4% of RE (rare earth element), and the balance of Al (aluminum). Further, RE (rare earth element) is one or more of Y (yttrium), ce (cerium) and La (lanthanum). Further, the homogenization treatment process comprises heating to 520-530 ℃, preserving heat for 1.0-1.5 h, heating to 530-550 ℃, preserving heat for 6.5-8.0 h, cooling to below 100 ℃ in a cooling furnace, taking out, and air cooling to room temperature. Further, the extrusion process conditions are that the cast ingot is preheated to 455-465 ℃, the heating temperature of a die is 450-460 ℃, the extrusion ratio is 12-17, the extrusion speed is 2.5-4.0 m/min, and the cast ingot is cooled to room temperature. Further, the heat treatment includes solutionizing and aging; the solid solution process comprises the steps of preserving heat for 6-8 hours at 500-550 ℃ and quenching in water at 25-40 ℃; the aging process comprises the steps of heating at 160-180 ℃, preserving heat for 4-6 hours, and air cooling to room temperature. According to the technical scheme, rare earth elements are added into the aluminum alloy, so that the effects of purifying a matrix, refining and modifying and microalloying can be achieved in the aluminum alloy, refining of an aluminum alloy structure, improvement of mechanical properties and extrusion processability of the aluminum alloy structure are facilitated, si-containing phases and Fe-containing phases can be uniformly distributed in the aluminum alloy matrix, net-shaped distribution is formed on the surface of a crystal boundary, growth of crystal grains at the crystal boundary is hindered, the structure is refined, and corrosion resistance and brightness of the aluminum alloy can be improved. During the extrusion process, the structure of the aluminum alloy can be further refined. The aluminum profile with the refined structure can show better compactness and integrity after being oxidized, is more beneficial to improving the protective performance of the aluminum profile, improving the corrosion resistance and improving the brightness of the aluminum profile. Further, the surface treatment comprises electrolytic oxidation, electrophoretic painting and hole sealing; electrolytic oxidation includes anodic plasma electrolytic oxidation and cathodic plasma electrolytic deposition; The electrocoating is cathodic electrophoresis. In the above technical solutions, there are many protection techniques for the surface of aluminum and its alloys, including electroplating, spraying, electroless plating, anodic oxidation, micro-arc oxidation, vapor deposition, etc. Wherein, micro-arc oxidation (plasma electrolyt