阅读说明：本技术 一种阳极氧化轧制镜面铝板带材及其制备方法 (Anodized rolled mirror-surface aluminum plate strip and preparation method thereof ) 是由 高崇 刘辉 吴广奇 赖爱玲 马科 杨升 徐巍昆 于 2021-09-03 设计创作，主要内容包括：本发明涉及一种阳极氧化轧制镜面铝板带材及其制备方法,所述制备方法中,将制备的铝合金扁锭轧制成板材,再进行阳极氧化处理,轧制过程包括热轧制过程和冷轧制过程,热轧制过程中单道次压下率＞40%的次数不少于3次,冷轧制过程单道次压下率＞40%的次数不少于2次；阳极氧化处理时,采用10%～20%硫酸电解液进行精细阳极氧化处理,处理温度为15℃±3℃,电流密度为I≤1.4A/dm2,所形成的氧化膜厚度≤20μm；所制备的镜面铝板带材的表面膜孔直径小于20nm,表面色差△E＜0.25。本发明提高了阳极氧化轧制镜面铝的表面质量,改善其力学性能,从而满足高端装备装饰用阳极氧化镜面铝的技术要求。(The invention relates to an anodized rolling mirror aluminum plate strip and a preparation method thereof, wherein in the preparation method, a prepared aluminum alloy slab ingot is rolled into a plate, and then is anodized, the rolling process comprises a hot rolling process and a cold rolling process, the times of the single-pass reduction rate of more than 40% in the hot rolling process are not less than 3 times, and the times of the single-pass reduction rate of more than 40% in the cold rolling process are not less than 2 times; during anodic oxidation treatment, 10% -20% sulfuric acid electrolyte is adopted for fine anodic oxidation treatment, the treatment temperature is 15 +/-3 ℃, the current density is I less than or equal to 1.4A/dm2, and the thickness of the formed oxide film is less than or equal to 20 microns; the diameter of the surface film hole of the prepared mirror aluminum plate strip is less than 20nm, and the surface color difference delta E is less than 0.25. The invention improves the surface quality of the anodized rolling mirror aluminum and the mechanical property thereof, thereby meeting the technical requirements of the anodized mirror aluminum for high-end equipment decoration.)

1. A method for preparing mirror aluminum plate strips by anodic oxidation rolling, which comprises the steps of rolling a prepared aluminum alloy slab ingot into a plate, and then carrying out anodic oxidation treatment, and is characterized in that: the rolling process comprises a hot rolling process and a cold rolling process, the times of the single-pass reduction rate of more than 40% in the hot rolling process are not less than 3, and the times of the single-pass reduction rate of more than 40% in the cold rolling process are not less than 2; during anodic oxidation treatment, 10% -20% sulfuric acid electrolyte is adopted for fine anodic oxidation treatment, the treatment temperature is 15 +/-3 ℃, the current density is I less than or equal to 1.4A/dm2, and the thickness of the formed oxide film is less than or equal to 20 microns.

2. The method for preparing a mirror-surface aluminum plate strip by anodic oxidation rolling according to claim 1, wherein the method comprises the following steps: the alloy raw material for preparing the aluminum alloy slab ingot comprises the following components in percentage by mass: si is less than 0.10 percent; fe is less than 0.10 percent; cu is less than 0.10 percent; mn is less than 0.10 percent; mg is less than 0.05 percent; ti < 0.05%, and the balance Al and inevitable impurities.

3. An anodized rolled mirror-finished aluminum sheet strip produced by the production method according to claim 1 or 2, characterized in that: the diameter of the surface film hole of the prepared mirror aluminum plate strip is less than 20nm, and the surface color difference delta E is less than 0.25.

4. The specular aluminum sheet strip of claim 3, wherein: the grains in the prepared mirror aluminum plate strip are mainly deformed grains, and the average size is less than 30 mu m.

5. The specular aluminum sheet strip of claim 3, wherein: the thickness of the prepared mirror surface aluminum plate strip is 0.1-1.0 mm, the tensile strength is more than or equal to 170MPa, the yield strength is more than or equal to 150MPa, the elongation is more than or equal to 3%, the surface roughness Ra is less than or equal to 0.05 mu m, the Rz is less than or equal to 0.5 mu m, and the mirror surface effect is achieved.

6. The specular aluminum sheet strip of claim 5, wherein: the surface glossiness of the prepared mirror-surface aluminum plate strip before the anodic oxidation treatment is more than or equal to 800GU, and the surface glossiness of the anode after the anodic oxidation treatment is more than or equal to 750 GU.

7. The specular aluminum sheet strip of claim 3, wherein: the prepared mirror aluminum plate strip comprises the following components in percentage by mass: si is less than 0.10 percent; fe is less than 0.10 percent; cu is less than 0.10 percent; mn is less than 0.10 percent; mg is less than 0.05 percent; ti < 0.05%, and the balance Al and inevitable impurities.

Technical Field

The invention belongs to the field of aluminum alloy materials, and particularly relates to an anodized rolled mirror-surface aluminum plate strip and a preparation method thereof.

Background

The mirror surface aluminum material is widely applicable to more than ten industry fields such as high-end equipment, automobiles, lamps, indoor and outdoor decoration and the like, and has huge market application prospect. Meanwhile, the rolled mirror aluminum can replace mechanical and chemical polished mirror aluminum, effectively reduce noise and acid-base waste liquid pollution, is beneficial to energy conservation and emission reduction, and is highly in line with the development requirement of environmental protection. The surface roughness and the glossiness of the prior rolled mirror aluminum can not meet the use requirements of high-end equipment decoration, and after anodic oxidation, the surface glossiness of the mirror aluminum is lower and the defect of heterochrosis exists, so that the preparation method of the anodic oxidation rolled mirror aluminum needs to be optimized to improve the surface quality of products and meet the use requirements of the high-end equipment decoration.

Disclosure of Invention

The invention aims to provide an anodized rolled mirror-surface aluminum plate strip and a preparation method thereof, which improve the surface quality of anodized rolled mirror-surface aluminum and improve the mechanical property thereof through the optimization of alloy components, the regulation of rolling rate and the optimization of anodizing treatment parameters, thereby meeting the technical requirements of anodized mirror-surface aluminum for high-end equipment decoration.

In order to achieve the purpose, the invention adopts the technical scheme that: a method for preparing mirror aluminum plate strips by anodic oxidation rolling comprises the steps of rolling a prepared aluminum alloy slab ingot into a plate, and then carrying out anodic oxidation treatment, wherein the rolling process comprises a hot rolling process and a cold rolling process, the times of the single-pass reduction rate of more than 40% in the hot rolling process are not less than 3 times, and the times of the single-pass reduction rate of more than 40% in the cold rolling process are not less than 2 times; during anodic oxidation treatment, 10% -20% sulfuric acid electrolyte is adopted for fine anodic oxidation treatment, the treatment temperature is 15 +/-3 ℃, the current density is I less than or equal to 1.4A/dm2, and the thickness of the formed oxide film is less than or equal to 20 microns.

The alloy raw material for preparing the aluminum alloy slab ingot comprises the following components in percentage by mass: si is less than 0.10 percent; fe is less than 0.10 percent; cu is less than 0.10 percent; mn is less than 0.10 percent; mg is less than 0.05 percent; ti < 0.05%, and the balance Al and inevitable impurities.

The anodic oxidation rolling mirror aluminum plate strip prepared by the preparation method has the surface film hole diameter of less than 20nm and the surface color difference delta E of less than 0.25.

The grains in the prepared mirror aluminum plate strip are mainly deformed grains, and the average size is less than 30 mu m.

The thickness of the prepared mirror surface aluminum plate strip is 0.1-1.0 mm, the tensile strength is more than or equal to 170MPa, the yield strength is more than or equal to 150MPa, the elongation is more than or equal to 3%, the surface roughness Ra is less than or equal to 0.05 mu m, the Rz is less than or equal to 0.5 mu m, and the mirror surface effect is achieved.

The surface glossiness of the prepared mirror-surface aluminum plate strip before the anodic oxidation treatment is more than or equal to 800GU, and the surface glossiness of the anode after the anodic oxidation treatment is more than or equal to 750 GU.

The prepared mirror aluminum plate strip comprises the following components in percentage by mass: si is less than 0.10 percent; fe is less than 0.10 percent; cu is less than 0.10 percent; mn is less than 0.10 percent; mg is less than 0.05 percent; ti < 0.05%, and the balance Al and inevitable impurities.

The invention has the beneficial effects that: the invention provides a preparation method of an anodized rolling mirror surface aluminum plate strip and the mirror surface aluminum plate strip, which adopts high-purity aluminum alloy components to improve the transparency of an oxide film after anodization, regulates and controls the grain structure and the oxide film structure which are suitable for a mirror surface aluminum plate by optimizing a rolling process and an anodizing process to prepare high-glossiness anodized mirror surface aluminum, wherein the surface roughness Ra of the prepared mirror surface aluminum is less than or equal to 0.05 mu m and Rz is less than or equal to 0.5 mu m, the mirror surface effect is presented, the glossiness before the anodization is more than or equal to 800GU, the surface glossiness of the anode after the anodization is more than or equal to 750GU, the color difference delta E is less than 0.25, the heterochrosis defect of the surface of the mirror surface aluminum after the anodization at present is overcome, the technical requirement of high-end equipment on the surface performance of the mirror surface aluminum of a decorative part is met, the tensile strength of the prepared mirror surface aluminum is more than or equal to 170MPa, and the yield strength is more than or equal to 150MPa, the elongation is more than or equal to 3 percent, and the technical requirement of high-end equipment decorating parts on the mechanical property of the anodized mirror aluminum can be met.

Drawings

FIG. 1 shows the crystal grain morphology and distribution of the mirror aluminum plate strip prepared by the present invention.

FIG. 2 shows the pore size distribution and morphology of the anodic oxide film of the mirror aluminum sheet strip prepared by the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and examples, but the invention is not limited thereto.

Example 1: an anodized rolled mirror-surface aluminum plate strip comprises the following components in percentage by mass: si = 0.08%; fe = 0.05%; cu = 0.01%; mn = 0.01%; mg = 0.02%: ti =0.02%, and the balance Al and inevitable impurities.

The preparation method of the mirror aluminum plate strip comprises the following steps: firstly, designing alloy raw materials for ingot casting according to the components of finished mirror-surface aluminum plate strips, then preparing flat ingots by smelting and semi-continuous casting, then sequentially carrying out hot rolling and cold rolling, wherein the times of hot rolling single-pass reduction rate being more than 40% are 3 times, the times of cold rolling single-pass reduction rate being more than 40% are 4 times, and finally carrying out anodic oxidation treatment, wherein the conditions are as follows: the sulfuric acid concentration is 18%, and the current density I =1.0A/dm²(ii) a The thickness of the oxide film after anodic oxidation is 3-5 μm.

Through detection, the grain structure and the anodic oxide film structure in the mirror aluminum prepared by the method are shown in figures 1 and 2, the tensile strength is 177MPa, the yield strength is 165MPa, and the elongation is 3.5%; the surface roughness Ra =0.013 μm and Rz is less than or equal to 0.361 μm, the mirror effect is presented, and the glossiness is 840GU before the anodic oxidation treatment; the surface glossiness of the anode after anodic oxidation is 790GU, and the color difference delta E =0.07, so that the technical requirements of the tensile property and the surface quality of the anodic oxidation mirror surface aluminum are met.

Example 2: an anodized rolled mirror-surface aluminum plate strip comprises the following components in percentage by mass: si = 0.05%; fe = 0.04%; cu = 0.05%; mn = 0.03%; mg = 0.03%: ti =0.01%, and the balance Al and inevitable impurities.

The preparation method of the mirror aluminum plate strip comprises the following steps: firstly, designing alloy raw materials for ingot casting according to the components of finished mirror-surface aluminum plate strips, then preparing flat ingots by smelting and semi-continuous casting, then sequentially carrying out hot rolling and cold rolling, wherein the times of hot rolling single-pass reduction rate being more than 40% are 3 times, the times of cold rolling single-pass reduction rate being more than 40% are 4 times, and finally carrying out anodic oxidation treatment, wherein the conditions are as follows: the sulfuric acid concentration is 12%, and the current density I =1.2A/dm²(ii) a The thickness of the oxide film after anodic oxidation is 3-5 μm.

The mirror aluminum prepared by the method has the tensile strength of 187MPa, the yield strength of 177MPa and the elongation of 3.2 percent through detection; the surface roughness Ra =0.014 μm and Rz is less than or equal to 0.354 μm, the surface roughness shows a mirror surface effect, and the glossiness is 810GU before the anodic oxidation treatment; the surface glossiness of the anode after anodic oxidation is 760GU, and the color difference delta E =0.05, thereby meeting the technical requirements of the tensile property and the surface quality of the anodic oxidation mirror surface aluminum.

Comparative example 1: the alloy raw materials comprise the following components in percentage by mass: si = 0.08%; fe = 0.05%; cu = 0.01%; mn = 0.01%; mg = 0.02%; ti =0.10%, and the balance Al and inevitable impurities; then in the hot rolling process, the times of the single-pass reduction rate of more than 40 percent are 2 times, and the times of the cold rolling single-pass reduction rate of more than 40 percent are 1 time; and finally, carrying out anodic oxidation treatment under the following conditions: the sulfuric acid concentration is 18%, and the current density I =1.0A/dm²(ii) a The thickness of the oxide film after anodic oxidation is 3-5 μm.

Through detection, the mirror aluminum prepared by the method has the tensile strength of 175MPa, the yield strength of 162MPa and the elongation of 3.5 percent; the surface roughness Ra =0.013 μm and Rz is less than or equal to 0.361 μm, the surface roughness of the aluminum alloy is mirror surface effect, the glossiness of the aluminum alloy before anodic oxidation is 840GU, the glossiness of the surface of the anode after anodic oxidation is 790GU, and the color difference delta E =0.38 is more than 0.25, so that the defect of different colors on the surface of the material cannot be overcome, and the technical requirement of the surface quality of the anodic oxidation mirror surface aluminum cannot be met.

The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims to be appended.