Tests show Fe was deposited in porous alumina only in ferrous solution with JF,and the color of the oxide film darkens gradually with the Fe-content in the oxide film,but their relation is not a simple linear rule and the real black can not be gained.

• 试验结果表明只有在含有JF的亚铁盐溶液中才能在氧化膜中沉积铁,膜的颜色随氧化膜中铁的含量增加而加深,但不成正比关系,真黑色的膜难以得到。