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Preparation method of anticorrosive aluminum profile

A technology for aluminum profiles and aluminum alloy profiles, applied in anti-corrosion coatings, metal material coating processes, anodic oxidation, etc., can solve problems such as corrosion, damage, and environmental pollution, and achieve good corrosion resistance, strong adhesion, and improved The effect of mechanical properties

Inactive Publication Date: 2020-01-03
CHENGDU SUNSHINE ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can obtain anti-corrosion aluminum profiles, it only uses a single oxide film for anti-corrosion, and corrosion will still occur after long-term use.
In addition, in the production and preparation process, the used praseodymium chloride and ammonium bifluoride are harmful to the human body and pollute the environment.

Method used

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  • Preparation method of anticorrosive aluminum profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment one: if figure 1 Shown, a kind of preparation method of anticorrosion aluminum profile, it comprises the following steps:

[0024] S1. Degreasing: immerse the aluminum alloy workpiece in a degreasing solution containing 5% sulfuric acid by mass fraction and 2g / L emulsifier for 4 minutes at a temperature of 50°C;

[0025] S2. Alkali washing: The degreased aluminum alloy profile is immersed in the alkali solution with a concentration of sodium hydroxide of 50g / L and a temperature of 50°C for 5s, which can remove the oxide and dirt naturally formed on the surface of the aluminum alloy profile;

[0026] S3. Neutralization: immerse the aluminum alloy profile in a nitric acid solution with a concentration of 10%, soak for 20s at room temperature, and neutralize the nitric acid solution and sodium hydroxide solution;

[0027] S4. Anodizing: use a sulfuric acid solution with a concentration of 180g / L as the electrolyte for anodizing to form an anodic oxidation film ...

Embodiment 2

[0033] Embodiment two: a kind of preparation method of anticorrosion aluminum profile, it comprises the following steps:

[0034] S1. Degreasing: immerse the aluminum alloy workpiece in a degreasing solution containing 10% sulfuric acid by mass fraction and 3g / L emulsifier for 5 minutes at a temperature of 53°C;

[0035] S2. Alkali washing: The degreased aluminum alloy profile is immersed in the alkali solution with a concentration of sodium hydroxide of 100g / L and a temperature of 55°C for 43s, which can remove the oxides and dirt naturally formed on the surface of the aluminum alloy profile;

[0036] S3. Neutralization: immerse the aluminum alloy profile in a nitric acid solution with a concentration of 12%, soak for 22s at room temperature, and neutralize the nitric acid solution and sodium hydroxide solution;

[0037] S4. Anodizing: use a sulfuric acid solution with a concentration of 190g / L as the electrolyte for anodizing to form an anodic oxidation film on the surface o...

Embodiment 3

[0043] Embodiment three: a kind of preparation method of anticorrosion aluminum profile, it comprises the following steps:

[0044] S1. Degreasing: immerse the aluminum alloy workpiece in a degreasing solution containing 15% by mass of sulfuric acid and 5g / L of emulsifier for 6 minutes at a temperature of 55°C;

[0045] S2. Alkali washing: The degreased aluminum alloy profile is immersed in the alkali solution with a concentration of sodium hydroxide of 150g / L and a temperature of 60°C for 60s, which can remove the oxides and dirt naturally formed on the surface of the aluminum alloy profile;

[0046] S3. Neutralization: immerse the aluminum alloy profile in a nitric acid solution with a concentration of 15%, soak for 30s at room temperature, and neutralize the nitric acid solution and sodium hydroxide solution;

[0047] S4. Anodizing: use a sulfuric acid solution with a concentration of 200g / L as the electrolyte for anodizing to form an anodic oxidation film on the surface of...

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Abstract

The invention discloses a preparation method of an anticorrosive aluminum profile. The method comprises the following steps of: S1, degreasing; S2, alkali washing; S3, neutralization; S4, anodic oxidation; S5, passivation treatment, specifically, the aluminum alloy profile is immersed into a chemical treatment solution containing sodium fluoride with the concentration of 0.2-0.3g / L, ammonium hydrofluoric acid with the concentration of 0.4-0.6g / L, potassium permanganate with the concentration of 0.1-0.15g / L, nitrate with the concentration of 0.1-0.13g / L and praseodymium chloride with the concentration of 0.2-0.3g / L, a protective layer is formed on the surface of an anodic oxide film in the soaking process, and after soaking for 20-30min, the aluminum alloy profile is taken out and then is washed by clear water; S6, drying treatment; and S7, spraying treatment, specifically, a raw material consisting of 21-35 parts of polyvinylidene fluoride, 80-90 parts of dimethylacetamide, 13-18 partsof NaH2PO4, 5-10 parts of titanium dioxide and 10-12 parts of pigment is sprayed onto the surface of the aluminum alloy profile, the spraying time is 1.0-2.0min, and the spraying pressure is 0.05-0.07MPa, so that an anticorrosive coating is formed on the surface of the protective layer. The preparation method of the anticorrosive aluminum profile has the beneficial effects that the corrosion resistance effect is better, and the adhesive force is stronger; and toxic substances harmful to the human body and the environment cannot be generated in the production and preparation process, and the environment is not polluted.

Description

technical field [0001] The invention relates to a method for preparing an anti-corrosion aluminum profile. Background technique [0002] "Corrosion resistance" is one of the important properties of aluminum profiles. Generally speaking, the basic corrosion types of aluminum profiles are point corrosion, galvanic corrosion, crevice corrosion, intergranular corrosion, and filiform corrosion. [0003] Among them, pitting corrosion, also known as hole corrosion, is an extremely local corrosion form in which needle-like, point-like, and hole-like shapes are produced on metals. Aluminum will undergo pitting corrosion in the atmosphere, fresh water, and neutral aqueous solution, and it can cause perforation in severe cases, but the corrosion holes may eventually stop developing, and the amount of corrosion remains at a limit value. Pitting corrosion is a unique form of anodic reaction and is an autocatalytic process. [0004] Galvanic corrosion is a characteristic corrosion form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/16C23C22/34C09D127/16C09D5/08C09D7/61
CPCC08K2003/2241C09D5/08C09D127/16C23C22/34C25D11/08C25D11/16C09D7/61C08K3/22C08K3/32
Inventor 廖健
Owner CHENGDU SUNSHINE ALUMINUM
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