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Preparation method of steel surface in-situ growth zinc-aluminum hydrotalcite film

A zinc-aluminum hydrotalcite, in-situ growth technology, applied in the plating of superimposed layers, liquid chemical plating, coating, etc., can solve the problem of poor heat resistance, uneven dispersion of LDHs powder, weak metal matrix bonding force, etc. problem, to achieve the effect of improving corrosion resistance

Inactive Publication Date: 2020-06-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although mixing LDHs powder into organic coatings can effectively improve the corrosion resistance of metals, there are still some problems, such as weak bonding with the metal matrix, uneven dispersion of LDHs powders, poor heat resistance, etc.

Method used

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  • Preparation method of steel surface in-situ growth zinc-aluminum hydrotalcite film
  • Preparation method of steel surface in-situ growth zinc-aluminum hydrotalcite film
  • Preparation method of steel surface in-situ growth zinc-aluminum hydrotalcite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) According to the mass ratio of 49:49:2, weigh Al powder, Al 2 o 3 and NH 4 Cl, the aluminizing agent is obtained after uniform mixing.

[0046] (2) Cover the bottom of the aluminized tank with aluminizing agent to a thickness of about 5mm, put a Q235 steel sheet of 10mm×10mm×3mm into the aluminizing tank, and then pour the aluminizing agent to cover the surface of the Q235 steel to a thickness of about 5mm.

[0047] (3) Put the aluminized tank into a box furnace, raise the temperature to 550°C at a rate of 10°C / min, and keep it warm for 5 hours; after cooling with the furnace, take out the steel sample and clean the residual aluminizing agent with ethanol, and dry it at room temperature Aluminized steel is obtained.

[0048] (4) With n(Zn 2+ ):n(NH 4 NO 3 ) = Zn(NO 3 ) 2 , NH 4 NO 3 Mix the solutions, add 5% ammonia water dropwise to adjust the pH to 6.5, and transfer the above solution into a polytetrafluoro-lined autoclave.

[0049] (5) The aluminized s...

Embodiment 2

[0053] (1) According to the mass ratio of 49:49:2, weigh Al powder, Al 2 o 3 and NH 4 Cl, the aluminizing agent is obtained after uniform mixing.

[0054] (2) Cover the bottom of the aluminized tank with aluminizing agent to a thickness of about 5mm, put a Q235 steel sheet of 10mm×10mm×3mm into the aluminizing tank, and then pour the aluminizing agent to cover the surface of the Q235 steel to a thickness of about 5mm.

[0055] (3) Put the aluminized tank into a box furnace, raise the temperature to 600°C at a rate of 10°C / min, and keep it warm for 4 hours; after cooling with the furnace, take out the steel sample and clean the residual aluminizing agent with ethanol, and dry it at room temperature Aluminized steel is obtained.

[0056] (4) With n(Zn 2+ ):n(NH 4 NO 3 )=1:1 ratio configuration of 0.05mol / L of Zn(NO 3 ) 2 , NH 4 NO 3 Mix the solutions, add 5% ammonia water dropwise to adjust the pH to 7.0, and transfer the above solution into a polytetrafluoro-lined aut...

Embodiment 3

[0061] (1) According to the mass ratio of 49:49:2, weigh Al powder, Al 2 o 3 and NH 4 Cl, the aluminizing agent is obtained after uniform mixing.

[0062](2) Cover the bottom of the aluminized tank with aluminizing agent to a thickness of about 5mm, put a Q235 steel sheet of 10mm×10mm×3mm into the aluminizing tank, and then pour the aluminizing agent to cover the surface of the Q235 steel to a thickness of about 5mm.

[0063] (3) Put the aluminized tank into a box furnace, raise the temperature to 650°C at a rate of 10°C / min, and keep it warm for 3 hours; after cooling with the furnace, take out the steel sample and clean the residual aluminizing agent with ethanol, and dry it at room temperature Aluminized steel is obtained.

[0064] (4) With n(Zn 2+ ):n(NH 4 NO 3 )=1:1 ratio configuration of 0.05mol / L of Zn(NO 3 ) 2 , NH 4 NO 3 Mix the solutions, add 5% ammonia water dropwise to adjust the pH to 8.0, and transfer the above solution into a polytetrafluoro-lined auto...

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Abstract

The invention discloses a preparation method of a steel surface in-situ growth zinc-aluminum hydrotalcite film. The preparation method comprises the following steps that Q235 steel, Al powder, Al2O3,NH4Cl, Zn (NO3) 2, NH4NO3, ammonia water and Na2MoO4 are taken as raw material, the surface aluminizing treatment is carried out on the Q235 steel by a powder embedding method, then, nitrate intercalated zinc-aluminum hydrotalcite is prepared on the surface of aluminized steel in an in-situ growth mode through a hydrothermal method, and finally, ZnAl-NO3LDHs is treated through a sodium molybdate solution, and the molybdate intercalated zinc-aluminum hydrotalcite film is obtained through an ion exchange reaction. According to the preparation method, the Zn-Al hydrotalcite film grows in situ andis treated with the sodium molybdate solution on the basis of aluminizing of the surface of a Q235 steel matrix, and the protection and corrosion inhibition effects on the steel matrix are achieved.

Description

technical field [0001] The invention relates to a preparation method of a zinc-aluminum hydrotalcite film with anti-corrosion performance in seawater, in particular to a method for in-situ growth of a molybdate-intercalated zinc-aluminum hydrotalcite film on the surface of Q235 steel. Background technique [0002] With the rapid development of machinery manufacturing and military industry, iron and steel materials have become the most widely used materials in the world, and higher and higher requirements have been put forward for various performance indicators of iron and steel products. Corrosion has brought great economic losses and waste of resources to industrial production and people's lives (Duan Xue, Lu Jun, et al. Two-dimensional nanocomposite hydroxide: structure, assembly and function [M] Beijing: Science Publishing Society, 2013:504-541). Corrosion has become one of the important factors affecting the sustainable development of the national economy and society. ...

Claims

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Application Information

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IPC IPC(8): C23C10/50C23C18/12C23C28/00
CPCC23C10/50C23C18/1204C23C28/322C23C28/34
Inventor 王吉会谢树语胡文彬
Owner TIANJIN UNIV
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