Film forming solution for growing Mg-Al hydrotalcite film in situ on surface of magnesium alloy and application thereof

• Main Authors: SHAN DAYONG, SONG YINGWEI, HAN ENHOU, CHEN JUN
• Format: Patent
• Language: Chinese; English
• Published: 19.09.2012
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention relates to the field of magnesium alloy surface treatment, in particular to a film forming solution for growing an Mg-Al hydrotalcite film in situ on the surface of magnesium alloy, and a method for preparing the Mg-Al hydrotalcite film on the surface of the magnesium alloy by using the solution. The film forming solution comprises a pretreatment solution and an aftertreatment solution, wherein the pretreatment solution is obtained through dropwise adding an alkaline solution containing Al to a saturated carbonic acid solution; the alkaline solution containing the Al is obtained through putting a pure aluminum plate into an alkaline solution in a temperature range of a normal temperature to a temperature of 90 DEG to be dissolved until the alkaline solution is saturated; the aftertreatment solution is obtained through regulating a pH (potential of hydrogen) value on the basis of the pretreatment solution by using the alkaline solution; and the magnesium alloy has a low aluminum content or does n