Theory and practice are shown that the passivated film is a kind of gelatiniform combination film containing chromate and phosphate because it was formed by chromatising and phosphatizing reaction. 实践和理论表明，所形成的钝化膜实际上是铬酸钝化反应和磷化反应的有机结合，它是一种凝胶的铬酸盐和磷酸盐复合型钝化膜。
The forming process of passivation film possibly consists of four steps which are zinc dissolution, basic area appearance, gelatiniform film forming and converting to passivation film. 钝化膜的成膜过程可能包括镀锌层的溶解、碱性薄层的形成、胶状膜的形成和胶状膜转化成钝化膜4个步骤。
