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。