Why is iron a black metal?

Because the surface of iron often rusts, it is covered with a mixture of black ferroferric oxide and brown ferroferric oxide, which looks black. So people call it "black metal". Ferrous metals include iron, manganese, chromium and their alloys, such as steel, pig iron, ferroalloy and cast iron.

The color of metal is reflected by reflected light. When light shines on metal powder, the reflection of light is irregular. In all directions, light reflects each other and is absorbed or reflected by adjacent metal surfaces (though very small), so that after countless reflections and absorption, little or no light enters people's eyes, so that the metal powder appears black.

The role of iron:

1, used in pharmacy, pesticide, powder metallurgy, hot hydrogen generator, gel propellant, combustion activator, catalyst, water purification adsorbent, sintering activator, powder metallurgy products, various mechanical parts products, cemented carbide materials products, etc.

2. Pure iron is used to manufacture iron cores of generators and motors, reduced iron powder is used in powder metallurgy, and steel is used to manufacture machines and tools. In addition, iron and its compounds are also used to make magnets, medicines, inks, pigments, abrasives and so on.

3. Used as reducing agent. Used for preparing iron salts. But also can be used for preparing electronic components.

The color of metal is reflected by reflected light. When light shines on metal powder, the reflection of light is irregular. In all directions, light reflects each other and is absorbed or reflected by adjacent metal surfaces (though very small), so that after countless reflections and absorption, little or no light enters people's eyes, so that the metal powder appears black.