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Transformation liquid for preparation of corrosion-resistant oxidation film on aluminium alloy surface and method of use thereof

A technology of aluminum alloy surface and corrosion resistance, applied in the direction of metal material coating process, etc., can solve the problem of low film forming efficiency, achieve the effects of less environmental pollution, long-term use of the solution, and stable solution

Inactive Publication Date: 2010-01-06
陈东初 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-temperature, high-efficiency, low-temperature, high-efficiency solution that not only solves the problem of low film-forming efficiency of the current chromium-substituting treatment solution, but also provides an oxide film with excellent corrosion resistance on the surface of the aluminum alloy in order to solve the deficiencies of the prior art. , a chromium-free surface treatment solution with rapid film formation at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After the solution of the present invention is prepared, it needs to be stirred rapidly under the air, so that the solution can fully react. During chemical conversion treatment, the micro-cathode and micro-anode on the surface of the aluminum alloy undergo an electrochemical reaction (there are micro-anodes and micro-cathodes on the surface of the aluminum alloy in the electrolyte, the anode: the aluminum-magnesium metal phase with a relatively negative potential, and the cathode: possibly near the aluminum alloy Elements or intermetallic compounds with relatively positive potential. The micro-cathode and micro-anode electrochemical reactions on the surface of the aluminum alloy lead to a local area with a higher pH value on the surface of the aluminum alloy sample, where hydroxide precipitates are deposited.

[0023] The reaction of conversion film formation on aluminum alloy surface can be expressed as follows:

[0024] Micro-anodic reaction on aluminum alloy surface...

Embodiment 2

[0057] The difference between this example and the above-mentioned embodiment lies in that the LY12 aluminum alloy is subjected to the same pretreatment as that described in Example 1, and then placed in the chemical compound conversion solution for treatment. Ce salt 12g·L -1 , Potassium permanganate 1.5g L -1 , Potassium perchlorate 0.3g L -1 , strontium chloride 1.0g·L -1 , Nitric acid 15mL·L -1 , sodium nitrate 10g·L -1 , Phytic acid 0.2g L -1 , Sodium dodecylbenzenesulfonate wetting agent 0.5g L -1 , the temperature is room temperature, and the treatment time is 3 minutes; after the reaction is completed, rinse with deionized water, dry naturally, and store in a dry place. The surface of the treated LY12 aluminum alloy forms a golden yellow conversion film with ideal corrosion resistance, which shows that it has passed the 168-hour neutral salt spray test (ASTMB117), reaching 8 grades.

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PUM

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Abstract

The invention discloses a transforming solution for preparing an anti-corrosion compound oxidation film on an aluminum alloy surface and its using method. The invention is characterized in that: the transforming solution is a film-forming promoter comprising rare-earth salt (nitrate or sulfate and compound salt of cerium, praseodymium, and neodymium), the compound oxidant of radical of permanganate, nitrate and perchlorate, etc., film-forming promoter of vanadium salt and strontium salt, etc.; the transforming solution comprises no sexavalent chromium, and is environmental friendly; the reaction speed is improved by the compound oxidant and the film-forming promoter, no heating is needed for the chemical transforming, the treating time is 1 to 5 min. The invention can rapidly prepare under room temperature compound oxidation film comprising compound rare-earth oxide, alumina and manganese oxide with good resistance to corrosion on aluminum alloy surface. The treating solution has the advantages of rapid film-forming speed, simple process, even film layer, high resistance to corrosion and low environmental pollution, etc.

Description

technical field [0001] The invention relates to the field of aluminum alloy surface treatment, in particular to using an environment-friendly non-chromium rare earth conversion treatment solution to quickly prepare a chemical conversion coating based on rare earth elements and manganese composite oxides with good corrosion resistance on the surface of aluminum alloys at room temperature . Background technique [0002] Aluminum alloy is widely used for its low density, high specific strength, easy processing and forming, castable, strengthenable, strong thermal and electrical conductivity, no low-temperature brittleness, non-magnetic, strong light and heat reflection, and nuclear radiation resistance. Automobiles, aerospace, architectural decoration, home appliances, instruments, computers, mobile phones, daily hardware and many other fields have become the second largest metal structural materials after steel. Due to the high chemical activity of aluminum and its alloys, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/06C23C22/40
Inventor 陈东初李文芳黄铭深
Owner 陈东初