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

4 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0008] Although mixing LDHs powder into organic coatings can effectively improve the corrosion resistance of metals, there are...

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.

Application Domain

Solid state diffusion coatingLiquid/solution decomposition chemical coating +1

Technology Topic

Ion exchangeHydrotalcite +8

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Examples

Experimental program(4)

Example Embodiment

[0044] Example 1

[0045] (1) According to the mass ratio of 49:49:2, weigh the Al powder and Al 2 O 3 And NH 4 Cl, after homogeneously mixed to obtain aluminizing agent.

[0046] (2) Spread the aluminizing agent on the bottom of the aluminizing tank, about 5mm thick, putting a 10mm×10mm×3mm Q235 steel sheet into the aluminizing tank, and then pour the aluminizing agent to cover the Q235 steel surface about 5mm thick.

[0047] (3) Put the aluminizing can in a box furnace, raise it to 550℃ at a temperature increase rate of 10℃/min, and keep it warm for 5 hours; after the furnace is cooled, take out the steel sample and wash the residual aluminizing agent with ethanol, and dry at room temperature Aluminized steel is obtained.

[0048] (4) Taking n(Zn 2+ ):n(NH 4 NO 3 )=1:1 ratio configures 0.05mol/L (the sum of the concentration of zinc ion and ammonium nitrate) of Zn(NO 3 ) 2 , NH 4 NO 3 Mix the solution, add 5% ammonia water dropwise to adjust the pH to 6.5, and transfer the above solution into a polytetrafluoroethylene-lined autoclave.

[0049] (5) The aluminized steel sample is immersed in the above solution, and the autoclave is placed in a vacuum drying furnace at 90°C for 12 hours.

[0050] (6) Take out the autoclave from the vacuum drying furnace, cool it to room temperature, take out the sample and wash and dry it with ethanol.

[0051] (7) Immerse the above sample in a 0.05mol/L sodium molybdate solution, keep it at 40°C for 4 hours, take it out, wash it with deionized water, and dry it to prepare molybdate intercalated zinc-aluminum hydrotalcite on the surface of Q235 steel film.

Example Embodiment

[0052] Example 2

[0053] (1) According to the mass ratio of 49:49:2, weigh the Al powder and Al 2 O 3 And NH 4 Cl, after homogeneously mixed to obtain aluminizing agent.

[0054] (2) Spread the aluminizing agent on the bottom of the aluminizing tank, about 5mm thick, putting a 10mm×10mm×3mm Q235 steel sheet into the aluminizing tank, and then pour the aluminizing agent to cover the Q235 steel surface about 5mm thick.

[0055] (3) Put the aluminizing can in a box furnace, raise it to 600℃ at a temperature increase rate of 10℃/min, and keep it warm for 4 hours; after the furnace is cooled, take out the steel sample and wash the residual aluminizing agent with ethanol, and dry at room temperature Aluminized steel is obtained.

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

[0057] (5) The aluminized steel sample is immersed in the above solution, and the autoclave is placed in a vacuum drying furnace at 120°C for 12 hours.

[0058] (6) Take out the autoclave from the vacuum drying furnace, cool it to room temperature, take out the sample and wash and dry it with ethanol.

[0059] (7) Immerse the above sample in a 0.05mol/L sodium molybdate solution, keep it at 60°C for 4 hours, take it out, wash it with deionized water, and dry it to prepare molybdate intercalated zinc-aluminum hydrotalcite on the surface of Q235 steel film.

Example Embodiment

[0060] Example 3

[0061] (1) According to the mass ratio of 49:49:2, weigh the Al powder and Al 2 O 3 And NH 4 Cl, after homogeneously mixed to obtain aluminizing agent.

[0062] (2) Spread the aluminizing agent on the bottom of the aluminizing tank, about 5mm thick, putting a 10mm×10mm×3mm Q235 steel sheet into the aluminizing tank, and then pour the aluminizing agent to cover the Q235 steel surface about 5mm thick.

[0063] (3) Put the aluminizing can in a box furnace, raise it to 650℃ at a temperature increase rate of 10℃/min, and keep it warm for 3 hours; after the furnace is cooled, take out the steel sample and wash the residual aluminizing agent with ethanol, and dry at room temperature Aluminized steel is obtained.

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

[0065] (5) The aluminized steel sample is immersed in the above solution, and the autoclave is placed in a vacuum drying furnace at 100°C for 8 hours.

[0066] (6) Take out the autoclave from the vacuum drying furnace, cool it to room temperature, take out the sample and wash and dry it with ethanol.

[0067] (7) Immerse the above sample in a 0.05mol/L sodium molybdate solution, keep it at 80°C for 3 hours, take it out, wash it with deionized water, and dry it to prepare molybdate intercalated zinc-aluminum hydrotalcite on the surface of Q235 steel film.

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Classification and recommendation of technical efficacy words

Improve corrosion resistance

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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