Chromium-free anodic oxide film sealing method

The invention discloses a chromium-free anodic oxide film sealing method, relates to the technical field of hole sealing, and aims to solve the technical problem that an existing anodic oxide film sealing method is harmful to the environment and human bodies during use. The chromium-free anodic oxide film sealing method comprises the following steps that water-soluble polyurethane, SiO2 and a surfactant are mixed, and a sealing solution is obtained; and an anodic oxidation workpiece is put into the sealing solution to be soaked for 30 s to 90 s, so that film holes of the anodic oxidation film are completely sealed. 本申请公开了一种无铬阳极氧化膜封闭方法，涉及封孔技术领域，旨在解决现有阳极氧化膜封闭方法在使用时对环境和人体有害的技术问题。所述无铬阳极氧化膜封闭方法，包括以下步骤：将水溶性聚氨酯、SiO2和表面活性剂混合，获得封闭溶液；将阳极氧化工件放入所述封闭溶液中浸渍30s～90s，使阳极氧化膜的膜孔被完全封闭。