Third surface metallic film for automobile semi-reflecting semi-transparent type electrochromic inner rearview mirror

The invention discloses a third surface metallic film for an automobile semi-reflecting semi-transparent type electrochromic inner rearview mirror. The third surface metallic film comprises a base layer, a conducting and reflecting layer, and a protection layer arranged in sequence, the material of the base layer is NiCr, the material of the conducting and reflecting layer is Ag, the material of the protection layer is Cr, the thickness of the base layer is 20-100 nm, the thickness of the conducting and reflecting layer is 10-100 nm, and the thickness of the protection layer is 5-20 nm. According to the third surface metallic film, the metallic film with lower cost is selected, and the reflectivity of the third surface metallic film for the automobile electrochromic inner rearview mirror can be controlled to be about 70% on the premise of guaranteeing the resistance; the adhesion of the film is improved; and sulfuration and oxidation of the film are avoided, and the electrochromic property of electrochromic finished products is guaranteed.