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Chromium-free oxidation treatment solution of aluminum alloy and preparation method thereof

A technology for treating solution and chromium oxidation, applied in the direction of metal material coating process, etc., can solve the problems of high process requirements, complicated operation, poor physical properties of oxide film, etc., and achieves simple preparation and use process, good stability and low cost. Effect

Inactive Publication Date: 2019-03-29
ANHUI QIMING SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common chemical oxidation process on the market has the disadvantages of high process requirements, complicated operation, and poor physical properties of the oxide film.
[0004] At present, the commonly used chemical solution is chromate solution, and the chromate oxidation process contains hexavalent chromium, which is extremely harmful to the human body and the environment, and its environmental protection problems such as pollution to the surrounding environment have become increasingly prominent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A chromium-free oxidation treatment solution for aluminum alloys, comprising the following components in weight percentages:

[0025] 20% sodium phosphomolybdate, 12% sodium aluminate, 2% potassium fluorosilicate, 0.2% sodium dodecylbenzenesulfonate, 0.3% sodium citrate, 1% hydrochloric acid, 0.08% inorganic buffer, the rest is water , pH value is 3.7.

[0026] The preparation method of the chromium-free oxidation treatment solution of aluminum alloy comprises the following steps:

[0027] Step 1: Add 2 / 3 of the calculated amount of water into the reactor, adjust the rotation speed to 600 rpm, add hydrochloric acid, and stir for 30 minutes;

[0028] Step 2, add sodium phosphomolybdate to the above solution, stir for 20min, and dissolve completely;

[0029] Step 3, adding sodium aluminate and potassium fluorosilicate to the solution in step 2, and stirring for 20 minutes;

[0030] Step 4, add sodium dodecylbenzenesulfonate and sodium citrate to the above solution, adj...

Embodiment 2

[0033] A chromium-free oxidation treatment solution for aluminum alloys, comprising the following components in weight percentages:

[0034] 15% potassium phosphotungstate, 10% ammonium aluminate, 1% sodium fluorosilicate, 0.5% sodium lauryl sulfate, 0.05% gluconic acid, 0.8% phosphoric acid, 0.06% inorganic buffer, the rest is water, pH value is 3.6.

[0035] The preparation method of the chromium-free oxidation treatment solution of aluminum alloy comprises the following steps:

[0036] Step 1: Add 2 / 3 of the calculated amount of water into the reactor, adjust the rotation speed to 600 rpm, add phosphoric acid, and stir for 30 minutes;

[0037] Step 2: Add potassium phosphotungstate to the above solution, stir for 30 minutes, and dissolve completely;

[0038] Step 3, add ammonium aluminate and sodium fluorosilicate to the solution in step 2, and stir for 15 minutes;

[0039] Step 4, add sodium lauryl sulfate and gluconic acid to the above solution, adjust the rotation spe...

Embodiment 3

[0042] A chromium-free oxidation treatment solution for aluminum alloys, comprising the following components in weight percentages:

[0043] 18% sodium phosphovanadate, 15% potassium aluminate, 1.2% ammonium fluoride, 0.3% OP emulsifier, 1.5% sulfuric acid, 0.04% inorganic buffer, the rest is water, and the pH value is 3.4.

[0044] The preparation method of the chromium-free oxidation treatment solution of aluminum alloy is basically the same as that of Example 2, the difference lies in the components and contents.

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Abstract

The invention provides a chromium-free oxidation treatment solution of aluminum alloy and a preparation method thereof. The chromium-free oxidation treatment solution comprises, by weight, the following components: 15-20% of heterosalt, 10-15% of aluminate, 0.1-3% of fluoride, 0.05-5% of a wetting agent, 0.05-0.5% of a complexing agent, 0.1-0.2% of inorganic acid, 0.05-0.1% of an inorganic buffering agent and the balance water. The pH value of the solution is 3-4. The preparation method comprises the following steps of: 1) adding part of water into a reaction kettle, adding the inorganic acid,and uniformly stirring and mixing; 2) adding the heterosalt, stirring and dissolving, then adding the aluminate, the fluoride, the wetting agent and the complexing agent, and stirring uniformly; 3) finally adding the inorganic buffering agent and the balance water, and uniformly stirring the mixture. The solution has good stability, low cost and strong corrosion resistance, and does not contain heavy metal ions such as chromium and the like or toxic metal ions.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy metal surface treatment, and in particular relates to a chromium-free oxidation treatment solution for aluminum alloy and a preparation method thereof. Background technique [0002] Due to its light weight, high strength, high toughness, good electrical and thermal conductivity, and easy processing and other excellent physical and chemical properties, aluminum alloys are widely used in aerospace, transportation, petrochemical and mechanical electronics and other fields. In order to improve the corrosion resistance and wear resistance of the aluminum alloy surface, surface treatment is required before use. [0003] In the prior art, the method of anodic oxidation or chemical oxidation is widely used to oxidize the aluminum alloy to form an oxide film on the surface to achieve the purpose of protection and decoration. The chemical oxidation method refers to the process of chemically reacting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44
CPCC23C22/44
Inventor 杨国凡
Owner ANHUI QIMING SURFACE TECH
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