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Sulfuric acid anodizing method for 7050 aluminum alloy

An anodizing, aluminum alloy technology, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problem of sulfuric acid anodizing process, and achieve the effect of high cost and long order cycle

Inactive Publication Date: 2017-10-24
HARBIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic 7050-T7451 aluminum alloy does not have a plate with a thickness exceeding 130mm. Due to the increase in the thickness of the plate, the uniformity of the alloy composition of the material will change in various aspects, so the sulfuric acid anodization process for plates exceeding 130mm is not available.

Method used

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  • Sulfuric acid anodizing method for 7050 aluminum alloy
  • Sulfuric acid anodizing method for 7050 aluminum alloy
  • Sulfuric acid anodizing method for 7050 aluminum alloy

Examples

Experimental program
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Effect test

example 1

[0081] Wipe the 7050-T7451 ultra-thick plate aluminum alloy with methyl ethyl ketone; immerse it in 55g / L alkali cleaning solution (TURCO4215NCLT cleaning agent solution) at 52°C for 8 minutes, then wash it with water for 4 minutes; observe the continuous water film on the surface of the aluminum alloy and then carry out pickling ; In the pickling solution at room temperature (the mixed solution of chromic anhydride, nitric acid, hydrofluoric acid and deionized water), the concentration of chromic anhydride is 25.2g / L, the concentration of nitric acid is 96g / L, and the corrosion rate is 23.6 microns / unit surface / hour, etch for 2.5 minutes, wash with water for 5 minutes; put the pretreated aluminum alloy parts in an anodic oxidation solution: sulfuric acid 212g / L, temperature 22°C, current density 1.4A / dm 2 , Oxidation for 30min. A pure lead plate is used as the cathode, and compressed air is used to stir during the anodizing process. After oxidation, wash with water for 4 min...

example 2

[0084] Wipe the 7050-T7451 ultra-thick plate aluminum alloy with methyl ethyl ketone; immerse it in 52g / L alkali cleaning solution (TURCO4215NCLT cleaning agent solution) at 53°C for 10 minutes, then wash it with water for 5 minutes; observe the continuous water film on the surface of the aluminum alloy and then carry out pickling ; In the pickling solution at room temperature (the mixed solution of chromic anhydride, nitric acid, hydrofluoric acid and deionized water), the concentration of chromic anhydride is 24.9g / L, the concentration of nitric acid is 93g / L, and the corrosion rate is 23.5 microns / unit Surface / hour, etching for 2 minutes, washing with water for 4 minutes; put the pretreated aluminum alloy parts in an anodic oxidation solution: sulfuric acid 210g / L, temperature 21°C, current density 1.3A / dm 2 , Oxidation for 35min. A pure lead plate is used as the cathode, and compressed air is used to stir during the anodizing process. After oxidation, wash with water for ...

example 3

[0087] After wiping the 7050-T7451 ultra-thick plate aluminum alloy with methyl ethyl ketone; immerse it in 49g / L alkali cleaning solution (TURCO4215NCLT cleaning agent solution) at 51°C for 9 minutes, then wash it with water for 4 minutes; observe the continuous water film on the surface of the aluminum alloy and then carry out pickling ; In the pickling solution at room temperature (the mixed solution of chromic anhydride, nitric acid, hydrofluoric acid and deionized water), the concentration of chromic anhydride is 23.9g / L, the concentration of nitric acid is 92g / L, and the corrosion rate is 23.2 microns / unit surface / hour, etch for 3 minutes, wash with water for 5 minutes; put the pretreated aluminum alloy parts in an anodic oxidation solution: sulfuric acid 208g / L, temperature 20°C, current density 1.2A / dm 2 , oxidation for 40min. A pure lead plate is used as the cathode, and compressed air is used to stir during the anodizing process. After oxidation, wash with water for...

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Abstract

The invention belongs to the field of material processing, and specifically relates to a sulfuric acid anodization method for 7050 aluminum alloys. The invention proposes a dense oxide film layer and a thin film thickness that can meet the requirements of sulfuric acid anodization of aluminum alloys for 7050-T7451 ultra-thick plates. , Sulfuric acid anodization process with good corrosion resistance and good bonding force with the primer.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a sulfuric acid anodization method for 7050 aluminum alloy. Background technique [0002] The development and engineering application of domestic high-strength and high-toughness aluminum alloy ultra-standard pre-stretched plates closely revolves around the model design requirements, and on the premise of new materials and new processes that have a certain development and application foundation in China, the development of 7050-T7451 ultra-thick plates (δ130mm Above) sulfuric acid anodization process performance research, to achieve the domestic independent guarantee of key materials. [0003] At present, the domestic 7050-T7451 aluminum alloy does not have a plate with a thickness exceeding 130mm. Due to the increase in the thickness of the plate, the uniformity of the alloy composition of the material will change in various aspects, so there is no sulfuric acid an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/16
CPCC25D11/08C25D11/16
Inventor 石镇滔李艳梅万杰张星汪原
Owner HARBIN
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