Aluminum and aluminum alloy surface self-repairing and corrosion-resisting conversion coating and preparation method thereof

A conversion coating and alloy technology, applied in the coating process of metal materials, etc., can solve the problem of self-healing and anti-corrosion properties of 8-hydroxyquinoline/hydrotalcite composite conversion coatings, and achieve self-healing and anti-corrosion coatings The effect of outstanding performance, novel ideas and novel methods

Active Publication Date: 2013-07-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, 8-hydroxyquinoline and its salts have good corrosion inhibition properties for aluminum and its alloys. However, the reports on the composite film of 8-hydroxyquinoline and its salts and hydrotalcite are limited to its fluorescence properties, and no 8-hydroxyquinoline has been reported. Self-healing anticorrosion properties of hydroxyquinoline / hydrotalcite composite conversion coating

Method used

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  • Aluminum and aluminum alloy surface self-repairing and corrosion-resisting conversion coating and preparation method thereof
  • Aluminum and aluminum alloy surface self-repairing and corrosion-resisting conversion coating and preparation method thereof
  • Aluminum and aluminum alloy surface self-repairing and corrosion-resisting conversion coating and preparation method thereof

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Embodiment 1

[0032] A method for preparing a self-healing anti-corrosion composite conversion coating on the surface of aluminum and its alloys, including the preparation of a magnesium-aluminum hydrotalcite conversion coating and a composite conversion coating. The specific process is as follows:

[0033] The first step is to prepare magnesium-aluminum hydrotalcite conversion coating for later use: aluminum and its alloys are polished step by step with 600, 1000, 1500, and 2000 sandpaper, then washed with water to remove impurities, ultrasonically cleaned in isopropanol to remove oil, and washed with deionized water. According to the ratio of magnesium nitrate and ammonium nitrate 1:5, prepare 100ml solution and put it in the reaction kettle, adjust the pH to 9 with dilute ammonia water, place the aluminum sheet vertically in the reaction kettle, and take it out after 48 hours of constant temperature reaction in an oven at 100°C , rinse and blow dry.

[0034] The second step, the preparat...

Embodiment 2

[0036] A method for preparing a self-healing anti-corrosion composite conversion coating on the surface of aluminum and its alloys, including the preparation of a magnesium-aluminum hydrotalcite conversion coating and a composite conversion coating. The specific process is as follows:

[0037] The first step is to prepare magnesium-aluminum hydrotalcite conversion coating for later use: aluminum and its alloys are polished step by step with 600, 1000, 1500, and 2000 sandpaper, then washed with water to remove impurities, ultrasonically cleaned in isopropanol to remove oil, and washed with deionized water. According to the ratio of magnesium nitrate and ammonium nitrate as 1:7, prepare 100ml solution and put it in the reaction kettle, adjust the pH to 9 with dilute ammonia water, place the aluminum sheet vertically in the reaction kettle, and take it out after 48 hours of constant temperature reaction in an oven at 90°C , rinse and blow dry.

[0038] The second step, the prepar...

Embodiment 3

[0040] A method for preparing a self-healing anti-corrosion composite conversion coating on the surface of aluminum and its alloys, including the preparation of a magnesium aluminum hydrotalcite conversion coating and a composite conversion coating. The specific process is as follows:

[0041] The first step is to prepare magnesium-aluminum hydrotalcite conversion coating for later use: aluminum and its alloys are polished step by step with 600, 1000, 1500 and 2000 sandpaper, then washed with water to remove impurities, ultrasonically cleaned in isopropanol to remove oil, and washed with deionized water. Prepare 100ml of solution according to the ratio of magnesium nitrate and ammonium nitrate as 1:10 and put it in the reaction kettle, adjust the pH to 9 with dilute ammonia water, place the aluminum sheet vertically in the reaction kettle, and take it out after 48 hours of constant temperature reaction in an oven at 120°C , rinse and blow dry.

[0042]The second step, the prep...

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Abstract

The invention belongs to the field of corrosion protection application of coating. An aluminum and aluminum alloy self-repairing and corrosion-resisting composite conversion coating is prepared by that a magnalium hydrotalcite layered structure is grown on an aluminum and aluminum alloy basal body, 8-chinosol for conversion is adopted for conversion, the molar concentration of 8-chinosol is 0.01 to 0.03 mol/L, PH ranges between 10.5 and 12.5, and conversion for 12 to 48 hours is performed at a room temperature. The coating ensures that the corrosion resisting performance of a metal basal body can be remarkably improved, the density of corrosion current is lowered by one order of magnitude, meanwhile, the coating has an excellent self-repairing and corrosion-resisting performance, after being soaked in 3.5 percent of NaCl for 7 days, the impedance of the converted coating is increased by one order of magnitude by compared with a coating not converted. The method adopting the scheme is simple to operate, the cost is low, the energy consumption is small, mass production can be carried out, a chromate process coating layer on an aluminum alloy surface can be replaced, and the coating and the method have a favorable application prospect.

Description

technical field [0001] The invention relates to a method for preparing an anticorrosion conversion film on the surface of aluminum and its alloys, belonging to the field of material synthesis and coating material anticorrosion invention application fields. Background technique [0002] Aluminum and its alloys are the most widely used non-ferrous metal structural materials in the industry, and are widely used in aviation, aerospace, automobiles, machinery manufacturing, marine aluminum alloys and chemical industries. Usually, in order to meet its environmental adaptability and safety in application, aluminum and its alloys need to be surface treated before use to achieve anti-corrosion and prolong service life. [0003] Among them, chemical conversion treatment is an effective means to improve the anti-corrosion performance of aluminum and its alloys. Among them, chromium conversion coating has good anti-corrosion performance. However, chromium conversion treatment cannot me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/66
Inventor 王立达张开悦刘洋孙文武婷婷张成刘贵昌
Owner DALIAN UNIV OF TECH
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