passive film

• 钝化膜

passive film的用法和样例：

例句

1. Properties of chromating film were improved greatly.
   钝化膜的性能得到了改善。
2. The purpose of the study was to improve the decorative effect of phosphating film.
   为提高磷化膜的装饰效果，开发出一种常温铁系彩色磷化工艺。