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Paint for preparing aluminum phosphate coating on surface of aluminum alloy and use method of paint

A technology of aluminum alloy surface and aluminum phosphate, which is applied in the coating process of metal materials, etc., can solve problems such as corrosion and holes, and achieve the effects of improving corrosion resistance and wear resistance, short manufacturing cycle and low cost

Inactive Publication Date: 2017-09-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the self-generated oxide film on the surface of aluminum and aluminum alloy is dense, there are still holes. Therefore, when the medium molecules are very small, they can easily pass through the pores and enter the matrix. This is the cause of corrosion, so it is necessary to surface the aluminum alloy. Modification

Method used

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  • Paint for preparing aluminum phosphate coating on surface of aluminum alloy and use method of paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Configure coating: take 10 parts of Al(H 2 PO 4 ) 3 , 80 parts of pure water, according to Al(H 2 PO 4 ) 3 1.1 times the amount of Al required for all chemical reactions to occur 2 o 3 Powder, mix and stir evenly to make paint;

[0031] (2) Pretreatment of cast aluminum alloy samples: place the cast aluminum alloy samples in 10wt% NaOH solution for alkali washing for 5 minutes, then wash with pure water for 1 minute, and dry naturally for later use;

[0032] (3) Coating preparation: put the dried cast aluminum alloy in the coating and immerse it for 2 minutes and then take it out. After the surface of the coating does not produce obvious flow, the sample is treated in a water vapor environment at 120°C for 90 minutes to obtain the surface with aluminum phosphoric acid. Salt-coated aluminum alloy samples.

Embodiment 2

[0034] (1) Configure coating: take 70 parts of Al(H 2 PO 4 ) 3 , 40 parts of pure water, according to Al(H 2 PO 4 ) 3 1.3 times the amount of Al required for all chemical reactions to occur 2 o 3 Powder, mix and stir evenly to make paint;

[0035] (2) Pretreatment of cast aluminum alloy samples: place the cast aluminum alloy samples in NaOH and NaCO 3 Wash with alkali in the mixed solution for 6 minutes, then wash with pure water for 2 minutes, and dry it naturally for later use. The concentration of NaOH in the mixed solution is 6wt%, and NaCO 3 The concentration is 6wt%;

[0036] (3) Coating preparation: put the dried cast aluminum alloy in the coating and immerse it for 3 minutes and take it out. After the surface of the coating does not produce obvious flow, the sample is treated in a water vapor environment at 160°C for 60 minutes to obtain aluminophosphate Surface-coated cast aluminum alloy samples.

Embodiment 3

[0038] (1) Configure coating: take 40 parts of Al(H 2 PO 4 ) 3 , 60 parts of pure water, according to Al(H 2 PO 4 ) 3 1.2 times the amount of Al required for all chemical reactions to occur 2 o 3 Powder, mix and stir evenly to make paint;

[0039] (2) Pretreatment of cast aluminum alloy samples: place the cast aluminum alloy samples in 10wt% NaOH solution for alkali washing for 6 minutes, then wash with pure water for 2 minutes, and apply the above coating after natural drying;

[0040] (3) Coating preparation: put the dried cast aluminum alloy in the coating and immerse it for 2.5 minutes and take it out. After the surface of the coating does not produce obvious flow, the sample is treated in a water vapor environment at 170°C for 50 minutes to obtain aluminum phosphoric acid. Salt surface-coated cast aluminum alloy samples.

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Abstract

The invention provides paint for preparing an aluminum phosphate coating on the surface of an aluminum alloy and a use method of the paint. The paint comprises the following raw materials, by weight, 10-70 parts of Al(H2PO4)3, 30-80 parts of pure water, 1.1-1.3 times of the total chemical reaction required amount of pure water and Al(H2PO4)3 of Al2O3 powder. The use method of the paint comprises the following steps: 1) the raw materials are weighed proportionally, and are mixed uniformly and the paint is obtained; 2) an aluminum alloy sample is placed in an alkaline solution for alkaline washing, and then is washed with the pure water, finally the aluminum alloy sample is subjected to natural drying for use; and 3) the surface of the dried aluminum alloy is coated with the paint, then the aluminum alloy is placed in a water vapor environment, and an aluminum alloy casting provided with the aluminum phosphate coating is obtained. The aluminum phosphate coating can be formed on the surface of the aluminum alloy, the corrosion resistance of the aluminum alloy can be improved, the technical treatment temperature is lower than the aging heat treatment temperature usually used for the aluminum alloy, and the use method can act as a final treatment technology to be applied to product production.

Description

Technical field: [0001] The invention relates to a paint for preparing an aluminum phosphate coating on the surface of an aluminum alloy and a method for using it, belonging to the technical field of aluminum alloy surface treatment. Background technique: [0002] Aluminum is an amphoteric metal. At room temperature, its chemical properties are very active, and it can react with oxygen to form a dense oxide film. This film can effectively prevent oxygen from contacting the substrate, thereby preventing further oxidation of the substrate. However, due to the relatively negative electrochemical potential of aluminum, electrochemical corrosion easily occurs with the participation of media in acid, alkali, salt, and humid atmospheres containing water vapor, which is unfavorable for the normal use of aluminum alloys. [0003] In the automobile industry, because of the low density of aluminum, it can greatly reduce weight and reduce energy consumption. Therefore, it is necessary t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05C23C22/73
CPCC23C22/05C23C22/73
Inventor 董寅生孙善云刘新来任彦军郭超黄志海
Owner SOUTHEAST UNIV
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