Preparation method of aluminum alloy corrosion resistant coating

A corrosion-resistant coating, aluminum alloy technology, applied in the direction of metal material coating process, coating, device for coating liquid on the surface, etc. Corrosion resistance is unstable and other problems, to achieve the effect of high economic return, flexible construction, and short processing time

Active Publication Date: 2010-04-14
南京南大波平电子信息有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the anodic oxidation process of aluminum alloy is complicated, and it is easily affected by chemical and physical factors such as electrolyte solubility changes and current fluctuations in the chemical reaction pool, resulting in defects in the oxide layer on the surface of the aluminum alloy, resulting in unstable corrosion resistance, and the anodic oxidation process is also difficult. Does not meet current environmental protection and energy saving requirements

Method used

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  • Preparation method of aluminum alloy corrosion resistant coating
  • Preparation method of aluminum alloy corrosion resistant coating
  • Preparation method of aluminum alloy corrosion resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 18.8L pure water (or deionized water) to the 25L stainless steel bucket, and then add 1.375Kg ammonium nitrate (NH 4 NO 3 ), 0.65Kg cobalt nitrate (Co(NO 3 ) 2 .6H 2 O), 0.66L formic acid (HCOOH), 0.3mol / L ammonium hydroxide (NH 4 OH) aqueous solution directly mixed solution PH=6.8-7.2, then add 0.325Kg sodium nitrite (NaNO 2 ), 5mL of 30wt% hydrogen peroxide (H 2 O 2 ) aqueous solution, heated to 55-65°C under normal nitrogen jet stirring for 30-90 minutes. After the reaction, 0.3 mol / L ammonium hydroxide (NH 4 OH) aqueous solution until the PH of the reaction solution = 6.8-7.2, set aside.

[0026] The clean aluminum alloy test plate is heated and soaked in an aqueous solution of cobalt at 50-65°C for 5-25 minutes, then taken out and dried at room temperature for 24 hours, and then the surface of the test plate is treated with a spray solution of oxidized polyaniline doped mercapto organic acid compound , vacuum drying to remove excess solvent, salt spray...

Embodiment 2

[0028] Add 16.7L pure water (or deionized water) to the 25L stainless steel bucket, and then add 1.325Kg ammonium nitrate (NH 4 NO 3 ), 0.65Kg cobalt nitrate (Co(NO 3 ) 2 .6H 2 O), 1L glacial acetic acid (CH 3 COOH), 20 mL of 30 wt% hydrogen peroxide (H 2 O 2 ) aqueous solution, activated ordinary nitrogen jet stirring device, and reacted for 10 to 15 minutes. Add 0.325Kg of sodium nitrite (NaNO 2 ) heated to 36-42°C for 20-30 minutes. Then 0.42mol / L ammonium hydroxide (NH 4 OH) aqueous solution until the pH of the reaction solution = 6.7-7.0, and finally add 5 mL of 30 wt% hydrogen peroxide (H 2 O 2 ) aqueous solution, heated to 55-65°C, stirred for several minutes, and set aside.

[0029] The clean aluminum alloy test plate is heated and soaked in an aqueous solution of cobalt at 50-65°C for 5-25 minutes, then taken out and dried at room temperature for 24 hours, and then the surface of the test plate is treated with a spray solution of oxidized polyaniline doped ...

Embodiment 3

[0031] Add 18.8L of pure water (or deionized water) to the 25L stainless steel bucket under ordinary nitrogen jet stirring, and then add 1.375Kg of ammonium nitrate (NH 4 NO 3 ), 0.65Kg cobalt nitrate (Co(NO 3 ) 2 .6H 2 O), 0.66L ammonium formate (NH 4 COOH), dropwise add 0.2mol / L ammonium hydroxide (NH 4 OH) aqueous solution directly mixed solution PH=7.0-7.1, then add 0.325Kg sodium nitrite (NaNO 2 ), 5mL of 30wt% hydrogen peroxide (H 2 O 2 ) aqueous solution reaction, slight ammonia gas was generated in the process, and the reaction continued for 5-10 minutes. Then the temperature was further raised to 55-65°C for 30-90 minutes. After the reaction, 0.2mol / L ammonium hydroxide (NH 4 OH) aqueous solution until the PH of the reaction solution = 7.0-7.1, set aside.

[0032] The clean aluminum alloy test plate is heated and soaked in an aqueous solution of cobalt at 50-65°C for 5-25 minutes, then taken out and dried at room temperature for 24 hours, and then the surfac...

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Abstract

The invention relates to a preparation method of an aluminum alloy corrosion resistant coating, comprising the following steps: forming a passivation layer which has a certain nanometer thickness and contains cobalt element on the surface of aluminum alloy by adopting a chemical reaction method and further covering a sulfydryl organic acid compound doped oxidation polyaniline coating on the passivation layer. By adopting the method, the corrosion resistant characteristic of the surface of the aluminum alloy is realized through inhibiting electrochemical reaction. The invention solves the problems of complex process, unstable oxidation quality, high energy consumption, severe pollution and the like of the traditional anode oxidation, and is suitable for use in the fields of special aluminum alloy materials in the industries of navigation, spaceflight, ships and warships and the like. Compared with the prior art, the invention has the characteristics of simple method, short reaction time, little equipment investment and high economic return.

Description

technical field [0001] The invention relates to a preparation method of a high-strength and high-toughness aluminum alloy corrosion-resistant coating, in particular to the preparation of a corrosion-resistant layer of a special aluminum alloy for aircraft and large ships. Background technique [0002] The corrosion resistance of metal materials is an important performance index in evaluating the service life of materials. Aircraft and ships must withstand harsh salt, splash, spray, and continuous wet / dry cycles during operation, thereby subjecting aircraft and ships to extensive and severe corrosion problems. Therefore, solving the corrosion of aircraft and ships has received widespread attention. In recent years, with the rapid development of domestic aircraft and ship manufacturing industries, the use of high-performance aluminum alloys represented by high strength and high toughness is also increasing. Therefore, the anti-corrosion treatment of high-performance aluminum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/68B05D7/16C09D179/02
Inventor 胡益民汪洪陈晓东
Owner 南京南大波平电子信息有限公司
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