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Aluminum alloy neutral zirconium-tungsten conversion liquid and preparation method of zirconium-tungsten conversion film on surface of aluminum alloy

An aluminum alloy surface, aluminum alloy technology, applied in the direction of climate sustainability, metal material coating process, reduction of greenhouse gases, etc., can solve the problems of high production cost, unfavorable storage and transportation, etc., to achieve less equipment corrosion and conversion time. Short, safe effect

Pending Publication Date: 2022-08-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These reported chromium-free processes are all treatment technologies in the range of acidity and alkalinity, which is not conducive to storage and transportation. Equipment such as acid-resistant and corrosion-resistant tanks are required, and the production cost is high.

Method used

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  • Aluminum alloy neutral zirconium-tungsten conversion liquid and preparation method of zirconium-tungsten conversion film on surface of aluminum alloy
  • Aluminum alloy neutral zirconium-tungsten conversion liquid and preparation method of zirconium-tungsten conversion film on surface of aluminum alloy
  • Aluminum alloy neutral zirconium-tungsten conversion liquid and preparation method of zirconium-tungsten conversion film on surface of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of the aluminum alloy neutral zirconium-tungsten conversion solution and the colored conversion film of the present embodiment is carried out according to the following steps:

[0039] (1) Preparation of an aluminum alloy neutral zirconium-tungsten conversion solution: weigh 8.0g of disodium EDTA, 2.0g of tannic acid, 4.0g of fluorozirconic acid, 3.0g of ammonium bifluoride, and 6.0g of tungstic acid. sodium. Accurately measure 700ml of deionized water, pour it into a 1000ml beaker, and add the above weighed reagents into the beaker in turn. When adding fluorozirconic acid, it needs to be slowly added dropwise without stirring. The rest of the reagents need to be stirred and dissolved at room temperature. Add the remaining reagents; add deionized water to 980ml, adjust the pH to 6.7, and replenish water to 1000ml to obtain the neutral zirconium-tungsten conversion solution.

[0040] (2) Substrate preparation: cut 6063 aluminum alloy into 30.0×30....

Embodiment 2

[0046] The preparation method of the aluminum alloy neutral zirconium-tungsten conversion solution and the colored conversion film of the present embodiment is carried out according to the following steps:

[0047] (1) Preparation of an aluminum alloy neutral zirconium-tungsten conversion solution: weigh 5.0g of disodium EDTA, 1.0g of tannic acid, 1.4g of fluorozirconic acid, 2.3g of ammonium bifluoride, and 2.5g of tungstic acid. sodium. Accurately measure 700ml of deionized water, pour it into a 1000ml beaker, and add the above weighed reagents into the beaker in turn. When adding fluorozirconic acid, it needs to be slowly added dropwise without stirring. The rest of the reagents need to be stirred and dissolved at room temperature. Add the remaining reagents; add deionized water to 980ml, adjust pH to 6.8, and replenish water to 1000ml to obtain the neutral zirconium-tungsten conversion solution.

[0048] (2) Substrate preparation: same as Example 1;

[0049] (3) Pickling...

Embodiment 3

[0053] The preparation method of the aluminum alloy neutral zirconium-tungsten conversion solution and the colored conversion film of the present embodiment is carried out according to the following steps:

[0054] (1) Preparation of an aluminum alloy neutral zirconium-tungsten conversion solution: Weigh 10.0 ethylenediaminetetraacetic acid disodium, 1.5 g tannic acid, 2.5 g fluorozirconic acid, 6.0 ammonium hydrogen hydride, and 7.0 sodium tungstate respectively. Accurately measure 700ml of deionized water, pour it into a 1000ml beaker, and add the above weighed reagents into the beaker in turn. When adding fluorozirconic acid, it needs to be slowly added dropwise without stirring. The rest of the reagents need to be stirred and dissolved at room temperature. Add the remaining reagents; add deionized water to 980ml, adjust the pH to 7.0, and replenish water to 1000ml to obtain the neutral zirconium-tungsten conversion solution.

[0055] (2) Substrate preparation: same as Exam...

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Abstract

The invention discloses an aluminum alloy neutral zirconium-tungsten conversion solution with a pH value of 6.7-7.2, and the aluminum alloy neutral zirconium-tungsten conversion solution comprises the following components: 1-8 g / L of hexafluorozirconic acid; 2-8 g / L of sodium tungstate; 1-6 g / L of ammonium bifluoride; tannic acid is 1-6 g / L; and 5-10 g / L of disodium ethylene diamine tetraacetate. The invention further discloses a preparation method of the zirconium-tungsten conversion coating on the surface of the aluminum alloy. The aluminum alloy neutral zirconium-tungsten conversion liquid is small in corrosion to equipment, convenient to store and transport and good in safety, equipment such as an acid-resistant and corrosion-resistant tank body can be not used, and the cost is reduced; a conversion film with good performance can be obtained on the surface of the aluminum alloy, the film layer is light golden yellow, the film layer is uniformly covered, the corrosion resistance is good, and the technological operation is simple.

Description

technical field [0001] The invention relates to the technical field of surface treatment of aluminum alloys, in particular to a method for preparing a neutral zirconium-tungsten conversion liquid for aluminum alloys and a zirconium-tungsten conversion film on the surface of aluminum alloys. Background technique [0002] Aluminum alloys have the advantages of good thermal conductivity, good electrical conductivity, low density, and high strength. They are widely used in many civil and industrial fields such as construction, aerospace, automobiles, and machinery manufacturing. They are the most widely used non-ferrous metals. The electronegativity of aluminum alloy is small, and the standard electrode potential of aluminum is relatively negative, only -1.66V. From the perspective of thermodynamics, it can be known that aluminum is a very active metal, and an oxide film is easily formed on the surface of the alloy. Although there is a natural oxide film on the surface, its thic...

Claims

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Application Information

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IPC IPC(8): C23C22/68C23C22/78
CPCC23C22/68C23C22/78Y02E30/30
Inventor 穆松林郭民城
Owner SOUTH CHINA UNIV OF TECH
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