The invention discloses a Mg(OH)2 / Mg-Sn
hydrotalcite composite film having an intercalation structure on the surface of
magnesium and
magnesium alloy and a preparation method thereof, relates to the technical field of the surface of
magnesium and
magnesium alloy, and aims to improve the
corrosion resistance of magnesium and
magnesium alloy and widen the application prospects in the fields of biological
medicine and the like. The preparation method comprises the following steps: S1,
initial treatment of magnesium and
magnesium alloy; S2, pretreatment: preparing a Sn4<+>
salt solution, regulating the pH value to 4.0 to obtain a pretreatment solution, and putting the magnesium and magnesium
alloy in the pretreatment solution with continuously introduced CO2 to obtain a precursor film; S3, posttreatment: soaking the magnesium and magnesium
alloy coated with the precursor film in a Na2CO3 solution to grow a Mg(OH)2 / Mg-Sn
hydrotalcite composite film on the surface of the magnesium and magnesium alloy; and S4, subsequent cleaning. According to the invention, the Mg(OH)2 / Mg-Sn
hydrotalcite composite film containing no aluminum and having
biosafety is grown on the surface of magnesium and magnesium alloy in an in-situ generation manner through a two-
step method; the
corrosion resistance of magnesium and magnesium alloy is improved; and the application of the hydrotalcite film in biological magnesium
alloy surface protection is widened.