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
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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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