Zinc is a blue-white metal.
The density was 7.14 g/cm 3 and the melting point was 419.5 °C. At room temperature, the property is brittle, and it becomes soft at 100 to 150 ° C; after 200 ° C, it becomes brittle.
The chemical nature of zinc is active, and in the air at normal temperature, a thin and dense basic zinc carbonate film is formed on the surface to prevent further oxidation. When the temperature reached 225 ° C, zinc oxidation was intense.
When burning, it emits a blue-green flame. Zinc is easily soluble in acid, and it is also easy to displace gold, silver, copper, etc. from solution. Use of zinc Since zinc is prone to form a protective film on the surface at room temperature, the largest use of zinc is in the galvanizing industry.
Zinc can be alloyed with many non-ferrous metals, including zinc and aluminum, copper and other alloys, which are widely used in die casting. Zinc and brass consisting of copper, tin and lead are used in machinery manufacturing. A zinc plate containing a small amount of elements such as lead and cadmium can be made into a negative electrode of a zinc-manganese dry battery, a printed zinc plate, a powder-corroded photo plate, and an offset printing plate.
Zinc reacts with acids or bases to evolve hydrogen. Zinc fertilizer (zinc sulfate, zinc chloride) promotes plant cell respiration and carbohydrate metabolism. Zinc powder, zinc bismuth white, zinc chrome yellow can be used as a pigment. Zinc oxide can also be used in the pharmaceutical, rubber, paint and other industries.
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