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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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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