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Aluminum-zinc phosphate coating and use method thereof

A technology of aluminum zinc phosphate and zinc phosphate, applied in anti-corrosion coatings, coatings and other directions, can solve the problems of irregular shape of aluminum alloy castings, reduce the durability of the overall coating, corrosion of corrosive media, etc., to enhance the physical shielding effect , good durability and corrosion resistance, the effect of improving crosslinking density

Active Publication Date: 2021-07-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the atmospheric environment, the surface of aluminum and aluminum alloys will be oxidized to produce an oxide film (mainly Al 2 o 3 ), can provide a certain protective effect, but the thickness of this naturally formed oxide film is small, generally not exceeding 10nm, and the surface of the film is loose and porous, easy to break, and has poor corrosion resistance. Erosion of corrosive media gradually fails
At the same time, with the aggravation of environmental problems such as acid rain, sulfur and nitrides such as salt, sulfur dioxide, and nitrogen dioxide in the atmosphere will settle and enrich on the surface of castings, forming an electrolyte solution in a humid environment, and aluminum alloys are more prone to pitting corrosion. Cause irreversible casting damage or even failure
[0004] Aluminum alloy castings are irregular in shape and have complex second phases. In the prior art, a continuous phosphate coating can be prepared on the surface of aluminum alloy castings by steam-assisted heat treatment. However, since the surface of aluminum alloy is coated with aluminum and Magnesium phosphate coating, resulting in the formation of phosphate coating is a multi-layer composite structure, so each coating is prone to defects such as microcracks and pores, which become channels for corrosion medium erosion, reducing the durability of the overall coating performance
Moreover, due to the need to prepare coatings separately in the aluminum-magnesium phosphate composite coating process, the complexity of the preparation process is increased.

Method used

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  • Aluminum-zinc phosphate coating and use method thereof
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  • Aluminum-zinc phosphate coating and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) 20 parts by weight of Al(H 2 PO 4 ) 3 , 8 parts of Zn(H 2 PO 4 ) 3 , 2 parts of TEOS and 70 parts of H 2 O carries out weighing of raw material, Al(H 2 PO 4 ) 3 and Zn(H 2 PO 4 ) 3 Join H 2 Stir in O, then follow with Al(H 2 PO 4 ) 3 1.2 times the number of parts required for all chemical reactions and Zn(H 2 PO 4 ) 3 Calculated at 0.7 times the number of parts required for all chemical reactions, add 29.6 parts of Al 2 o 3 Powder, Al 2 o 3 The particle size of the powder is 1000 mesh, and it is stirred at a speed of 1500r / min for 3 hours to obtain a coating;

[0034] (2) Place the cast aluminum alloy sample in NaOH and NaOH 2 CO 3 Wash with alkali in the mixed solution for 2 minutes, then wash with pure water for 1 minute, and dry it naturally for later use. Among them, NaOH and NaOH in the mixed solution 2 CO 3 The mass ratio is 5:4;

[0035] (3) Place the dried cast aluminum alloy sample in the coating for 3 minutes and take it out. Afte...

Embodiment 2

[0037] (1) 15 parts by weight of Al(H 2 PO 4 ) 3 , 10 parts of Zn(H 2 PO 4 ) 3 , 5 parts of TEOS and 70 parts of H 2 O carries out weighing of raw material, Al(H 2 PO 4 ) 3 and Zn(H 2 PO 4 ) 3 Join H 2 Stir in O, then follow with Al(H 2 PO 4 ) 3 1.0 times the number of parts required for all chemical reactions and Zn(H 2 PO 4 ) 3 Calculated at 0.6 times the number of parts required for all chemical reactions, add 16 parts of Al 2 o 3 Powder, Al 2 o 3 The particle size of the powder is 700 mesh, and it is stirred at a speed of 1000r / min for 5h to obtain a coating;

[0038] (2) Place the cast aluminum alloy sample in NaOH and NaOH 2 CO 3 Wash with alkali in the mixed solution for 3 minutes, then wash with pure water for 2 minutes, and dry it naturally for later use. Among them, NaOH and NaOH in the mixed solution 2 CO 3 The mass ratio is 5:3;

[0039] (3) Place the dried cast aluminum alloy sample in the coating for 2 minutes and take it out. After the ...

Embodiment 3

[0041] (1) 21 parts by weight of Al(H 2 PO 4 ) 3 , 7 parts of Zn(H 2 PO 4 ) 3 , 5 parts of TEOS and 70 parts of H 2 O carries out weighing of raw material, Al(H 2 PO 4 ) 3 and Zn(H 2 PO 4 ) 3 Join H 2 Stir in O, then follow with Al(H 2 PO 4 ) 3 1.3 times the number of parts required for all chemical reactions and Zn(H 2 PO 4 ) 3 Calculated at 0.8 times the number of parts required for all chemical reactions, add 32.9 parts of Al 2 o 3 Powder, Al 2 o 3 The particle size of the powder is 900 mesh, and the coating is obtained by stirring at a speed of 1200r / min for 3h;

[0042] (2) Place the cast aluminum alloy sample in NaOH and NaOH 2 CO 3 Wash with alkali in the mixed solution for 2 minutes, then wash with pure water for 2 minutes, and dry it naturally for later use. Among them, NaOH and NaOH in the mixed solution 2 CO 3 The mass ratio is 5:4;

[0043] (3) Place the dried cast aluminum alloy sample in the coating for 3 minutes and take it out. After t...

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Abstract

The invention discloses an aluminum-zinc phosphate coating and a use method thereof. The coating is prepared from the following components in parts by weight: 10 to 50 parts of Al(H2PO4)3, 1 to 20 parts of Zn(H2PO4)3, 1 to 10 parts of TEOS, 60 to 90 parts of H2O and 10 to 70 parts of Al2O3 powder. The modified aluminum-zinc phosphate coating is prepared on the surface of a cast aluminum alloy through a steam-assisted heat treatment method. According to the invention, Al(H2PO4)3 and Zn(H2PO4)3 are used as composite binders, so the reaction activity of the coating and a cast aluminum matrix is improved; as the TEOS is added as a modifier, the compatibility of nano-SiO2 and the composite binders can be improved, and the crosslinking density of the coating is improved; and the prepared modified aluminum zinc phosphate coating is uniform and flat, is tightly combined with the matrix, mainly comprises Zn3(PO4)2, AlPO4, AlPO4. 2H2O and SiO2, and can remarkably improve the corrosion resistance of an aluminum alloy casting.

Description

technical field [0001] The invention belongs to cast aluminum alloy surface treatment paint and its application method, in particular to an aluminum-zinc phosphate paint and its preparation method. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal material in industrial production. Because of its high specific strength, high specific stiffness, excellent electrical and thermal conductivity, and good machinability, it is widely used in automotive, aerospace, shipbuilding and other industrial fields. widely used. [0003] The chemical properties of aluminum and aluminum alloys are active, and their standard electrode potential is -1.66V (at 25°C). When aluminum comes into contact with a more reactive metal to form a galvanic cell, the aluminum acts as the anode and corrodes. In the atmospheric environment, the surface of aluminum and aluminum alloys will be oxidized to produce an oxide film (mainly Al 2 o 3 ), can provide a certain prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/61C09D7/63C09D5/08C23G1/22
CPCC09D1/00C09D7/61C09D7/63C09D5/08C23G1/22
Inventor 董寅生余亮徐雨生黄志海郭超储成林盛晓波
Owner SOUTHEAST UNIV
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