Milk powder cans are generally made of iron, and aluminum is rarely used. This is because iron has good ductility, corrosion resistance, and easy-to-use properties, making it suitable for making milk powder cans.
Aluminum is a metallic element with the element symbol AL, which is a silvery-white light metal. Malleable. Products are often made in sticks, sheets, foils, powders, bands, and filaments. In humid air, it can form an oxide film to prevent metal corrosion. When heated in the air, the aluminium powder burns violently and emits a dazzling white flame. Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solutions, insoluble in water. Relative density 270。Melting point 660 . Boiling point 2327. The content of aluminum in the earth's crust is the third most abundant metal element in the earth's crust after oxygen and silicon. It has the characteristics of light weight, corrosion resistance, high reflectivity, good electrical conductivity, non-magnetism, processability, non-toxicity, non-combustion and high scalability.
Because of these properties, aluminum is widely used in construction, packaging, electronics, transportation, and other industrial sectors.
Iron is a metallic element with atomic number 26 and is located in the fourth period of the periodic table, group VIII. Pure iron is a silvery-white lustrous metal with a density of 786g cm, melting point 1539. In addition to being electrically conductive, thermally conductive, and malleable, iron can also be attracted to magnets and is ferromagnetic. The important compounds of iron include ferric oxide, ferric oxide, ferric chloride and iron complexes. The main minerals in nature are hematite (mainly ferric oxide), magnetite (mainly ferric oxide) and siderite (mainly ferrous carbonate). Industrially, iron ore, coke and limestone are mixed in a blast furnace for smelting, which can be divided into pig iron, wrought iron and steel according to different carbon content. The main properties of iron, physical properties, electrical and thermal conductivity, ductility, ferromagnetism, chemical properties, alloys, abundance in the earth's crust and industrial applications, so the properties of iron make it have a wide range of applications and importance in human society.
Overall, iron is a metallic element that is widely used in various industrial sectors.